OpenGLCore/glBitmap.pas

{ glBitmap by Steffen Xonna aka Lossy eX (2003-2008)
  http://www.opengl24.de/index.php?cat=header&file=glbitmap

  modified by Delphi OpenGL Community (http://delphigl.com/) (2013)

  The contents of this file are used with permission, subject to
  the Mozilla Public License Version 1.1 (the "License"); you may
  not use this file except in compliance with the License. You may
  obtain a copy of the License at
  http://www.mozilla.org/MPL/MPL-1.1.html

  The glBitmap is a Delphi/FPC unit that contains several wrapper classes
  to manage OpenGL texture objects. Below you can find a list of the main
  functionality of this classes:
  - load texture data from file (e.g. BMP, TGA, DDS, PNG, JPEG, ...)
  - load texture data from several other image objects (e.g. TBitmap, TLazIntfImage, SDL Surface)
  - save texture data to file (e.g. BMP, TGA, DDS, PNG, JPEG, ...)
  - save texture data to several other image objects (e.g. TBitmap, TLazIntfImage, SDL Surface)
  - support for many texture formats (e.g. RGB8, BGR8, RGBA8, BGRA8, ...)
  - manage texture properties (e.g. Filter, Clamp, Mipmap, ...)
  - upload texture data to video card
  - download texture data from video card
  - manipulate texture data (e.g. add alpha, remove alpha, convert to other format, switch RGB, ...) }

unit glBitmap;

{$I glBitmapConf.inc}

// Delphi Versions
{$IFDEF fpc}
  {$MODE Delphi}

  {$IFDEF CPUI386}
    {$DEFINE CPU386}
    {$ASMMODE INTEL}
  {$ENDIF}

  {$IFNDEF WINDOWS}
    {$linklib c}
  {$ENDIF}
{$ENDIF}

// Operation System
{$IF DEFINED(WIN32) or DEFINED(WIN64) or DEFINED(WINDOWS)}
  {$DEFINE GLB_WIN}
{$ELSEIF DEFINED(LINUX)}
  {$DEFINE GLB_LINUX}
{$IFEND}

// OpenGL ES
{$IF DEFINED(OPENGL_ES_EXT)} {$DEFINE OPENGL_ES_1_1} {$IFEND}
{$IF DEFINED(OPENGL_ES_3_0)} {$DEFINE OPENGL_ES_2_0} {$IFEND}
{$IF DEFINED(OPENGL_ES_2_0)} {$DEFINE OPENGL_ES_1_1} {$IFEND}
{$IF DEFINED(OPENGL_ES_1_1)} {$DEFINE OPENGL_ES}     {$IFEND}

// checking define combinations
//SDL Image
{$IFDEF GLB_SDL_IMAGE}
  {$IFNDEF GLB_SDL}
    {$MESSAGE warn 'SDL_image won''t work without SDL. SDL will be activated.'}
    {$DEFINE GLB_SDL}
  {$ENDIF}

  {$IFDEF GLB_LAZ_PNG}
    {$MESSAGE warn 'The Lazarus TPortableNetworkGraphics will be ignored because you are using SDL_image.'}
    {$undef GLB_LAZ_PNG}
  {$ENDIF}

  {$IFDEF GLB_PNGIMAGE}
    {$MESSAGE warn 'The unit pngimage will be ignored because you are using SDL_image.'}
    {$undef GLB_PNGIMAGE}
  {$ENDIF}

  {$IFDEF GLB_LAZ_JPEG}
    {$MESSAGE warn 'The Lazarus TJPEGImage will be ignored because you are using SDL_image.'}
    {$undef GLB_LAZ_JPEG}
  {$ENDIF}

  {$IFDEF GLB_DELPHI_JPEG}
    {$MESSAGE warn 'The unit JPEG will be ignored because you are using SDL_image.'}
    {$undef GLB_DELPHI_JPEG}
  {$ENDIF}

  {$IFDEF GLB_LIB_PNG}
    {$MESSAGE warn 'The library libPNG will be ignored because you are using SDL_image.'}
    {$undef GLB_LIB_PNG}
  {$ENDIF}

  {$IFDEF GLB_LIB_JPEG}
    {$MESSAGE warn 'The library libJPEG will be ignored because you are using SDL_image.'}
    {$undef GLB_LIB_JPEG}
  {$ENDIF}

  {$DEFINE GLB_SUPPORT_PNG_READ}
  {$DEFINE GLB_SUPPORT_JPEG_READ}
{$ENDIF}

// Lazarus TPortableNetworkGraphic
{$IFDEF GLB_LAZ_PNG}
  {$IFNDEF GLB_LAZARUS}
    {$MESSAGE warn 'Lazarus TPortableNetworkGraphic won''t work without Lazarus. Lazarus will be activated.'}
    {$DEFINE GLB_LAZARUS}
  {$ENDIF}

  {$IFDEF GLB_PNGIMAGE}
    {$MESSAGE warn 'The pngimage will be ignored if you are using Lazarus TPortableNetworkGraphic.'}
    {$undef GLB_PNGIMAGE}
  {$ENDIF}

  {$IFDEF GLB_LIB_PNG}
    {$MESSAGE warn 'The library libPNG will be ignored if you are using Lazarus TPortableNetworkGraphic.'}
    {$undef GLB_LIB_PNG}
  {$ENDIF}

  {$DEFINE GLB_SUPPORT_PNG_READ}
  {$DEFINE GLB_SUPPORT_PNG_WRITE}
{$ENDIF}

// PNG Image
{$IFDEF GLB_PNGIMAGE}
  {$IFDEF GLB_LIB_PNG}
    {$MESSAGE warn 'The library libPNG will be ignored if you are using pngimage.'}
    {$undef GLB_LIB_PNG}
  {$ENDIF}

  {$DEFINE GLB_SUPPORT_PNG_READ}
  {$DEFINE GLB_SUPPORT_PNG_WRITE}
{$ENDIF}

// libPNG
{$IFDEF GLB_LIB_PNG}
  {$DEFINE GLB_SUPPORT_PNG_READ}
  {$DEFINE GLB_SUPPORT_PNG_WRITE}
{$ENDIF}

// Lazarus TJPEGImage
{$IFDEF GLB_LAZ_JPEG}
  {$IFNDEF GLB_LAZARUS}
    {$MESSAGE warn 'Lazarus TJPEGImage won''t work without Lazarus. Lazarus will be activated.'}
    {$DEFINE GLB_LAZARUS}
  {$ENDIF}

  {$IFDEF GLB_DELPHI_JPEG}
    {$MESSAGE warn 'The Delphi JPEGImage will be ignored if you are using the Lazarus TJPEGImage.'}
    {$undef GLB_DELPHI_JPEG}
  {$ENDIF}

  {$IFDEF GLB_LIB_JPEG}
    {$MESSAGE warn 'The library libJPEG will be ignored if you are using the Lazarus TJPEGImage.'}
    {$undef GLB_LIB_JPEG}
  {$ENDIF}

  {$DEFINE GLB_SUPPORT_JPEG_READ}
  {$DEFINE GLB_SUPPORT_JPEG_WRITE}
{$ENDIF}

// JPEG Image
{$IFDEF GLB_DELPHI_JPEG}
  {$IFDEF GLB_LIB_JPEG}
    {$MESSAGE warn 'The library libJPEG will be ignored if you are using the unit JPEG.'}
    {$undef GLB_LIB_JPEG}
  {$ENDIF}

  {$DEFINE GLB_SUPPORT_JPEG_READ}
  {$DEFINE GLB_SUPPORT_JPEG_WRITE}
{$ENDIF}

// libJPEG
{$IFDEF GLB_LIB_JPEG}
  {$DEFINE GLB_SUPPORT_JPEG_READ}
  {$DEFINE GLB_SUPPORT_JPEG_WRITE}
{$ENDIF}

// general options
{$EXTENDEDSYNTAX ON}
{$LONGSTRINGS ON}
{$ALIGN ON}
{$IFNDEF FPC}
  {$OPTIMIZATION ON}
{$ENDIF}

{$UNDEF GLB_LAZARUS}

interface

uses
  {$IFDEF OPENGL_ES}            dglOpenGLES,
  {$ELSE}                       dglOpenGL,                          {$ENDIF}

  {$IF DEFINED(GLB_WIN) AND
       DEFINED(GLB_DELPHI)}     windows,                            {$IFEND}

  {$IFDEF GLB_SDL}              SDL,                                {$ENDIF}
  {$IFDEF GLB_LAZARUS}          IntfGraphics, GraphType, Graphics,  {$ENDIF}
  {$IFDEF GLB_DELPHI}           Dialogs, Graphics, Types,           {$ENDIF}

  {$IFDEF GLB_SDL_IMAGE}        SDL_image,                          {$ENDIF}
  {$IFDEF GLB_PNGIMAGE}         pngimage,                           {$ENDIF}
  {$IFDEF GLB_LIB_PNG}          libPNG,                             {$ENDIF}
  {$IFDEF GLB_DELPHI_JPEG}      JPEG,                               {$ENDIF}
  {$IFDEF GLB_LIB_JPEG}         libJPEG,                            {$ENDIF}

  Classes, SysUtils;

type
{$IFNDEF fpc}
  QWord   = System.UInt64;
  PQWord  = ^QWord;

  PtrInt  = Longint;
  PtrUInt = DWord;
{$ENDIF}


  { type that describes the format of the data stored in a texture.
    the name of formats is composed of the following constituents:
    - multiple channels:
       - channel                          (e.g. R, G, B, A or Alpha, Luminance or X (reserved))
       - width of the chanel in bit       (4, 8, 16, ...)
    - data type                           (e.g. ub, us, ui)
    - number of elements of data types }
  TglBitmapFormat = (
    tfEmpty = 0,

    tfAlpha4ub1,                //< 1 x unsigned byte
    tfAlpha8ub1,                //< 1 x unsigned byte
    tfAlpha16us1,               //< 1 x unsigned short

    tfLuminance4ub1,            //< 1 x unsigned byte
    tfLuminance8ub1,            //< 1 x unsigned byte
    tfLuminance16us1,           //< 1 x unsigned short

    tfLuminance4Alpha4ub2,      //< 1 x unsigned byte (lum), 1 x unsigned byte (alpha)
    tfLuminance6Alpha2ub2,      //< 1 x unsigned byte (lum), 1 x unsigned byte (alpha)
    tfLuminance8Alpha8ub2,      //< 1 x unsigned byte (lum), 1 x unsigned byte (alpha)
    tfLuminance12Alpha4us2,     //< 1 x unsigned short (lum), 1 x unsigned short (alpha)
    tfLuminance16Alpha16us2,    //< 1 x unsigned short (lum), 1 x unsigned short (alpha)

    tfR3G3B2ub1,                //< 1 x unsigned byte (3bit red, 3bit green, 2bit blue)
    tfRGBX4us1,                 //< 1 x unsigned short (4bit red, 4bit green, 4bit blue, 4bit reserverd)
    tfXRGB4us1,                 //< 1 x unsigned short (4bit reserved, 4bit red, 4bit green, 4bit blue)
    tfR5G6B5us1,                //< 1 x unsigned short (5bit red, 6bit green, 5bit blue)
    tfRGB5X1us1,                //< 1 x unsigned short (5bit red, 5bit green, 5bit blue, 1bit reserved)
    tfX1RGB5us1,                //< 1 x unsigned short (1bit reserved, 5bit red, 5bit green, 5bit blue)
    tfRGB8ub3,                  //< 1 x unsigned byte (red), 1 x unsigned byte (green), 1 x unsigned byte (blue)
    tfRGBX8ui1,                 //< 1 x unsigned int (8bit red, 8bit green, 8bit blue, 8bit reserved)
    tfXRGB8ui1,                 //< 1 x unsigned int (8bit reserved, 8bit red, 8bit green, 8bit blue)
    tfRGB10X2ui1,               //< 1 x unsigned int (10bit red, 10bit green, 10bit blue, 2bit reserved)
    tfX2RGB10ui1,               //< 1 x unsigned int (2bit reserved, 10bit red, 10bit green, 10bit blue)
    tfRGB16us3,                 //< 1 x unsigned short (red), 1 x unsigned short (green), 1 x unsigned short (blue)

    tfRGBA4us1,                 //< 1 x unsigned short (4bit red, 4bit green, 4bit blue, 4bit alpha)
    tfARGB4us1,                 //< 1 x unsigned short (4bit alpha, 4bit red, 4bit green, 4bit blue)
    tfRGB5A1us1,                //< 1 x unsigned short (5bit red, 5bit green, 5bit blue, 1bit alpha)
    tfA1RGB5us1,                //< 1 x unsigned short (1bit alpha, 5bit red, 5bit green, 5bit blue)
    tfRGBA8ui1,                 //< 1 x unsigned int (8bit red, 8bit green, 8bit blue, 8 bit alpha)
    tfARGB8ui1,                 //< 1 x unsigned int (8 bit alpha, 8bit red, 8bit green, 8bit blue)
    tfRGBA8ub4,                 //< 1 x unsigned byte (red), 1 x unsigned byte (green), 1 x unsigned byte (blue), 1 x unsigned byte (alpha)
    tfRGB10A2ui1,               //< 1 x unsigned int (10bit red, 10bit green, 10bit blue, 2bit alpha)
    tfA2RGB10ui1,               //< 1 x unsigned int (2bit alpha, 10bit red, 10bit green, 10bit blue)
    tfRGBA16us4,                //< 1 x unsigned short (red), 1 x unsigned short (green), 1 x unsigned short (blue), 1 x unsigned short (alpha)

    tfBGRX4us1,                 //< 1 x unsigned short (4bit blue, 4bit green, 4bit red, 4bit reserved)
    tfXBGR4us1,                 //< 1 x unsigned short (4bit reserved, 4bit blue, 4bit green, 4bit red)
    tfB5G6R5us1,                //< 1 x unsigned short (5bit blue, 6bit green, 5bit red)
    tfBGR5X1us1,                //< 1 x unsigned short (5bit blue, 5bit green, 5bit red, 1bit reserved)
    tfX1BGR5us1,                //< 1 x unsigned short (1bit reserved, 5bit blue, 5bit green, 5bit red)
    tfBGR8ub3,                  //< 1 x unsigned byte (blue), 1 x unsigned byte (green), 1 x unsigned byte (red)
    tfBGRX8ui1,                 //< 1 x unsigned int (8bit blue, 8bit green, 8bit red, 8bit reserved)
    tfXBGR8ui1,                 //< 1 x unsigned int (8bit reserved, 8bit blue, 8bit green, 8bit red)
    tfBGR10X2ui1,               //< 1 x unsigned int (10bit blue, 10bit green, 10bit red, 2bit reserved)
    tfX2BGR10ui1,               //< 1 x unsigned int (2bit reserved, 10bit blue, 10bit green, 10bit red)
    tfBGR16us3,                 //< 1 x unsigned short (blue), 1 x unsigned short (green), 1 x unsigned short (red)

    tfBGRA4us1,                 //< 1 x unsigned short (4bit blue, 4bit green, 4bit red, 4bit alpha)
    tfABGR4us1,                 //< 1 x unsigned short (4bit alpha, 4bit blue, 4bit green, 4bit red)
    tfBGR5A1us1,                //< 1 x unsigned short (5bit blue, 5bit green, 5bit red, 1bit alpha)
    tfA1BGR5us1,                //< 1 x unsigned short (1bit alpha, 5bit blue, 5bit green, 5bit red)
    tfBGRA8ui1,                 //< 1 x unsigned int (8bit blue, 8bit green, 8bit red, 8bit alpha)
    tfABGR8ui1,                 //< 1 x unsigned int (8bit alpha, 8bit blue, 8bit green, 8bit red)
    tfBGRA8ub4,                 //< 1 x unsigned byte (blue), 1 x unsigned byte (green), 1 x unsigned byte (red), 1 x unsigned byte (alpha)
    tfBGR10A2ui1,               //< 1 x unsigned int (10bit blue, 10bit green, 10bit red, 2bit alpha)
    tfA2BGR10ui1,               //< 1 x unsigned int (2bit alpha, 10bit blue, 10bit green, 10bit red)
    tfBGRA16us4,                //< 1 x unsigned short (blue), 1 x unsigned short (green), 1 x unsigned short (red), 1 x unsigned short (alpha)

    tfDepth16us1,               //< 1 x unsigned short (depth)
    tfDepth24ui1,               //< 1 x unsigned int (depth)
    tfDepth32ui1,               //< 1 x unsigned int (depth)

    tfS3tcDtx1RGBA,
    tfS3tcDtx3RGBA,
    tfS3tcDtx5RGBA
  );

  { type to define suitable file formats }
  TglBitmapFileType = (
     {$IFDEF GLB_SUPPORT_PNG_WRITE} ftPNG,  {$ENDIF}    //< Portable Network Graphic file (PNG)
     {$IFDEF GLB_SUPPORT_JPEG_WRITE}ftJPEG, {$ENDIF}    //< JPEG file
     ftDDS,                                             //< Direct Draw Surface file (DDS)
     ftTGA,                                             //< Targa Image File (TGA)
     ftBMP,                                             //< Windows Bitmap File (BMP)
     ftRAW);                                            //< glBitmap RAW file format
   TglBitmapFileTypes = set of TglBitmapFileType;

  { possible mipmap types }
  TglBitmapMipMap = (
     mmNone,                //< no mipmaps
     mmMipmap,              //< normal mipmaps
     mmMipmapGlu);          //< mipmaps generated with glu functions

  { possible normal map functions }
   TglBitmapNormalMapFunc = (
     nm4Samples,
     nmSobel,
     nm3x3,
     nm5x5);

 ////////////////////////////////////////////////////////////////////////////////////////////////////
   EglBitmap                  = class(Exception);   //< glBitmap exception
   EglBitmapNotSupported      = class(Exception);   //< exception for not supported functions
   EglBitmapSizeToLarge       = class(EglBitmap);   //< exception for to large textures
   EglBitmapNonPowerOfTwo     = class(EglBitmap);   //< exception for non power of two textures
   EglBitmapUnsupportedFormat = class(EglBitmap)    //< exception for unsupporetd formats
   public
     constructor Create(const aFormat: TglBitmapFormat); overload;
     constructor Create(const aMsg: String; const aFormat: TglBitmapFormat); overload;
   end;

////////////////////////////////////////////////////////////////////////////////////////////////////
  { record that stores 4 unsigned integer values }
  TglBitmapRec4ui = packed record
  case Integer of
    0: (r, g, b, a: Cardinal);
    1: (arr: array[0..3] of Cardinal);
  end;

  { record that stores 4 unsigned byte values }
  TglBitmapRec4ub = packed record
  case Integer of
    0: (r, g, b, a: Byte);
    1: (arr: array[0..3] of Byte);
  end;

  { record that stores 4 unsigned long integer values }
  TglBitmapRec4ul = packed record
  case Integer of
    0: (r, g, b, a: QWord);
    1: (arr: array[0..3] of QWord);
  end;

  { structure to store pixel data in }
  TglBitmapPixelData = packed record
    Data:   TglBitmapRec4ui;  //< color data for each color channel
    Range:  TglBitmapRec4ui;  //< maximal color value for each channel
    Format: TglBitmapFormat;  //< format of the pixel
  end;
  PglBitmapPixelData = ^TglBitmapPixelData;

  TglBitmapSizeFields = set of (ffX, ffY);
  TglBitmapSize = packed record
    Fields: TglBitmapSizeFields;
    X: Word;
    Y: Word;
  end;
  TglBitmapPixelPosition = TglBitmapSize;

  { describes the properties of a given texture data format }
  TglBitmapFormatDescriptor = class(TObject)
  private
    // cached properties
    fBytesPerPixel: Single;   //< number of bytes for each pixel
    fChannelCount: Integer;   //< number of color channels
    fMask: TglBitmapRec4ul;   //< bitmask for each color channel
    fRange: TglBitmapRec4ui;  //< maximal value of each color channel

    { @return @true if the format has a red color channel, @false otherwise }
    function GetHasRed: Boolean;

    { @return @true if the format has a green color channel, @false otherwise }
    function GetHasGreen: Boolean;

    { @return @true if the format has a blue color channel, @false otherwise }
    function GetHasBlue: Boolean;

    { @return @true if the format has a alpha color channel, @false otherwise }
    function GetHasAlpha: Boolean;

    { @return @true if the format has any color color channel, @false otherwise }
    function GetHasColor: Boolean;

    { @return @true if the format is a grayscale format, @false otherwise }
    function GetIsGrayscale: Boolean;
  protected
    fFormat:        TglBitmapFormat;  //< format this descriptor belongs to
    fWithAlpha:     TglBitmapFormat;  //< suitable format with alpha channel
    fWithoutAlpha:  TglBitmapFormat;  //< suitable format without alpha channel
    fOpenGLFormat:  TglBitmapFormat;  //< suitable format that is supported by OpenGL
    fRGBInverted:   TglBitmapFormat;  //< suitable format with inverted RGB channels
    fUncompressed:  TglBitmapFormat;  //< suitable format with uncompressed data

    fBitsPerPixel: Integer;           //< number of bits per pixel
    fIsCompressed: Boolean;           //< @true if the format is compressed, @false otherwise

    fPrecision: TglBitmapRec4ub;      //< number of bits for each color channel
    fShift:     TglBitmapRec4ub;      //< bit offset for each color channel

    fglFormat:         GLenum;        //< OpenGL format enum (e.g. GL_RGB)
    fglInternalFormat: GLenum;        //< OpenGL internal format enum (e.g. GL_RGB8)
    fglDataFormat:     GLenum;        //< OpenGL data format enum (e.g. GL_UNSIGNED_BYTE)

    { set values for this format descriptor }
    procedure SetValues; virtual;

    { calculate cached values }
    procedure CalcValues;
  public
    property Format:        TglBitmapFormat read fFormat;         //< format this descriptor belongs to
    property ChannelCount:  Integer         read fChannelCount;   //< number of color channels
    property IsCompressed:  Boolean         read fIsCompressed;   //< @true if the format is compressed, @false otherwise
    property BitsPerPixel:  Integer         read fBitsPerPixel;   //< number of bytes per pixel
    property BytesPerPixel: Single          read fBytesPerPixel;  //< number of bits per pixel

    property Precision: TglBitmapRec4ub read fPrecision;  //< number of bits for each color channel
    property Shift:     TglBitmapRec4ub read fShift;      //< bit offset for each color channel
    property Range:     TglBitmapRec4ui read fRange;      //< maximal value of each color channel
    property Mask:      TglBitmapRec4ul read fMask;       //< bitmask for each color channel

    property RGBInverted:  TglBitmapFormat read fRGBInverted;  //< suitable format with inverted RGB channels
    property WithAlpha:    TglBitmapFormat read fWithAlpha;    //< suitable format with alpha channel
    property WithoutAlpha: TglBitmapFormat read fWithAlpha;    //< suitable format without alpha channel
    property OpenGLFormat: TglBitmapFormat read fOpenGLFormat; //< suitable format that is supported by OpenGL
    property Uncompressed: TglBitmapFormat read fUncompressed; //< suitable format with uncompressed data

    property glFormat:         GLenum  read fglFormat;         //< OpenGL format enum (e.g. GL_RGB)
    property glInternalFormat: GLenum  read fglInternalFormat; //< OpenGL internal format enum (e.g. GL_RGB8)
    property glDataFormat:     GLenum  read fglDataFormat;     //< OpenGL data format enum (e.g. GL_UNSIGNED_BYTE)

    property HasRed:       Boolean read GetHasRed;        //< @true if the format has a red color channel, @false otherwise
    property HasGreen:     Boolean read GetHasGreen;      //< @true if the format has a green color channel, @false otherwise
    property HasBlue:      Boolean read GetHasBlue;       //< @true if the format has a blue color channel, @false otherwise
    property HasAlpha:     Boolean read GetHasAlpha;      //< @true if the format has a alpha color channel, @false otherwise
    property HasColor:     Boolean read GetHasColor;      //< @true if the format has any color color channel, @false otherwise
    property IsGrayscale:  Boolean read GetIsGrayscale;   //< @true if the format is a grayscale format, @false otherwise

    function GetSize(const aSize: TglBitmapSize): Integer;     overload; virtual;
    function GetSize(const aWidth, aHeight: Integer): Integer; overload; virtual;

    { constructor }
    constructor Create;
  public
    { get the format descriptor by a given OpenGL internal format
        @param aInternalFormat  OpenGL internal format to get format descriptor for
        @returns                suitable format descriptor or tfEmpty-Descriptor }
    class function GetByFormat(const aInternalFormat: GLenum): TglBitmapFormatDescriptor;
  end;

////////////////////////////////////////////////////////////////////////////////////////////////////
  TglBitmapData = class;

  { structure to store data for converting in }
  TglBitmapFunctionRec = record
    Sender:   TglBitmapData;          //< texture object that stores the data to convert
    Size:     TglBitmapSize;          //< size of the texture
    Position: TglBitmapPixelPosition; //< position of the currently pixel
    Source:   TglBitmapPixelData;     //< pixel data of the current pixel
    Dest:     TglBitmapPixelData;     //< new data of the pixel (must be filled in)
    Args:     Pointer;                //< user defined args that was passed to the convert function
  end;

  { callback to use for converting texture data }
  TglBitmapFunction = procedure(var FuncRec: TglBitmapFunctionRec);

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  { class to store texture data in. used to load, save and
    manipulate data before assigned to texture object
    all operations on a data object can be done from a background thread }
  TglBitmapData = class
  private { fields }

    fData: PByte;               //< texture data
    fDimension: TglBitmapSize;  //< pixel size of the data
    fFormat: TglBitmapFormat;   //< format the texture data is stored in
    fFilename: String;          //< file the data was load from

    fScanlines:    array of PByte;  //< pointer to begin of each line
    fHasScanlines: Boolean;         //< @true if scanlines are initialized, @false otherwise

  private { getter / setter }

    { @returns the format descriptor suitable to the texture data format }
    function GetFormatDescriptor: TglBitmapFormatDescriptor;

    { @returns the width of the texture data (in pixel) or -1 if no data is set }
    function GetWidth: Integer;

    { @returns the height of the texture data (in pixel) or -1 if no data is set }
    function GetHeight: Integer;

    { get scanline at index aIndex
        @returns Pointer to start of line or @nil }
    function GetScanlines(const aIndex: Integer): PByte;

    { set new value for the data format. only possible if new format has the same pixel size.
      if you want to convert the texture data, see ConvertTo function }
    procedure SetFormat(const aValue: TglBitmapFormat);

  private { internal misc }

    { splits a resource identifier into the resource and it's type
        @param aResource  resource identifier to split and store name in
        @param aResType   type of the resource }
    procedure PrepareResType(var aResource: String; var aResType: PChar);

    { updates scanlines array }
    procedure UpdateScanlines;

  private { internal load and save }
{$IFDEF GLB_SUPPORT_PNG_READ}
    { try to load a PNG from a stream
        @param aStream  stream to load PNG from
        @returns        @true on success, @false otherwise }
    function  LoadPNG(const aStream: TStream): Boolean; virtual;
{$ENDIF}

{$ifdef GLB_SUPPORT_PNG_WRITE}
    { save texture data as PNG to stream
        @param aStream stream to save data to}
    procedure SavePNG(const aStream: TStream); virtual;
{$ENDIF}

{$IFDEF GLB_SUPPORT_JPEG_READ}
    { try to load a JPEG from a stream
        @param aStream  stream to load JPEG from
        @returns        @true on success, @false otherwise }
    function  LoadJPEG(const aStream: TStream): Boolean; virtual;
{$ENDIF}

{$IFDEF GLB_SUPPORT_JPEG_WRITE}
    { save texture data as JPEG to stream
        @param aStream stream to save data to}
    procedure SaveJPEG(const aStream: TStream); virtual;
{$ENDIF}

    { try to load a RAW image from a stream
        @param aStream  stream to load RAW image from
        @returns        @true on success, @false otherwise }
    function LoadRAW(const aStream: TStream): Boolean;

    { save texture data as RAW image to stream
        @param aStream stream to save data to}
    procedure SaveRAW(const aStream: TStream);

    { try to load a BMP from a stream
        @param aStream  stream to load BMP from
        @returns        @true on success, @false otherwise }
    function LoadBMP(const aStream: TStream): Boolean;

    { save texture data as BMP to stream
        @param aStream stream to save data to}
    procedure SaveBMP(const aStream: TStream);

    { try to load a TGA from a stream
        @param aStream  stream to load TGA from
        @returns        @true on success, @false otherwise }
    function LoadTGA(const aStream: TStream): Boolean;

    { save texture data as TGA to stream
        @param aStream stream to save data to}
    procedure SaveTGA(const aStream: TStream);

    { try to load a DDS from a stream
        @param aStream  stream to load DDS from
        @returns        @true on success, @false otherwise }
    function LoadDDS(const aStream: TStream): Boolean;

    { save texture data as DDS to stream
        @param aStream stream to save data to}
    procedure SaveDDS(const aStream: TStream);

  public { properties }
    property Data:      PByte           read fData;                     //< texture data (be carefull with this!)
    property Dimension: TglBitmapSize   read fDimension;                //< size of the texture data (in pixel)
    property Filename:  String          read fFilename;                 //< file the data was loaded from
    property Width:     Integer         read GetWidth;                  //< width of the texture data (in pixel)
    property Height:    Integer         read GetHeight;                 //< height of the texture data (in pixel)
    property Format:    TglBitmapFormat read fFormat write SetFormat;   //< format the texture data is stored in
    property Scanlines[const aIndex: Integer]: PByte read GetScanlines; //< pointer to begin of line at given index or @nil

    property FormatDescriptor: TglBitmapFormatDescriptor read GetFormatDescriptor; //< descriptor object that describes the format of the stored data

  public { flip }

    { flip texture horizontal
        @returns @true in success, @false otherwise }
    function FlipHorz: Boolean; virtual;

    { flip texture vertical
        @returns @true in success, @false otherwise }
    function FlipVert: Boolean; virtual;

  public { load }

    { load a texture from a file
        @param aFilename file to load texuture from }
    procedure LoadFromFile(const aFilename: String);

    { load a texture from a stream
        @param aStream  stream to load texture from }
    procedure LoadFromStream(const aStream: TStream); virtual;

    { use a function to generate texture data
        @param aSize    size of the texture
        @param aFormat  format of the texture data
        @param aFunc    callback to use for generation
        @param aArgs    user defined paramaters (use at will) }
    procedure LoadFromFunc(const aSize: TglBitmapSize; const aFormat: TglBitmapFormat; const aFunc: TglBitmapFunction; const aArgs: Pointer = nil);

    { load a texture from a resource
        @param aInstance  resource handle
        @param aResource  resource indentifier
        @param aResType   resource type (if known) }
    procedure LoadFromResource(const aInstance: Cardinal; aResource: String; aResType: PChar = nil);

    { load a texture from a resource id
        @param aInstance  resource handle
        @param aResource  resource ID
        @param aResType   resource type }
    procedure LoadFromResourceID(const aInstance: Cardinal; const aResourceID: Integer; const aResType: PChar);

  public { save }

    { save texture data to a file
        @param aFilename  filename to store texture in
        @param aFileType  file type to store data into }
    procedure SaveToFile(const aFilename: String; const aFileType: TglBitmapFileType);

    { save texture data to a stream
        @param aFilename  filename to store texture in
        @param aFileType  file type to store data into }
    procedure SaveToStream(const aStream: TStream; const aFileType: TglBitmapFileType); virtual;

  public { convert }

    { convert texture data using a user defined callback
        @param aFunc        callback to use for converting
        @param aCreateTemp  create a temporary buffer to use for converting
        @param aArgs        user defined paramters (use at will)
        @returns            @true if converting was successful, @false otherwise }
    function Convert(const aFunc: TglBitmapFunction; const aCreateTemp: Boolean; const aArgs: Pointer = nil): Boolean; overload;

    { convert texture data using a user defined callback
        @param aSource      glBitmap to read data from
        @param aFunc        callback to use for converting
        @param aCreateTemp  create a temporary buffer to use for converting
        @param aFormat      format of the new data
        @param aArgs        user defined paramters (use at will)
        @returns            @true if converting was successful, @false otherwise }
    function Convert(const aSource: TglBitmapData; const aFunc: TglBitmapFunction; aCreateTemp: Boolean;
      const aFormat: TglBitmapFormat; const aArgs: Pointer = nil): Boolean; overload;

    { convert texture data using a specific format
        @param aFormat  new format of texture data
        @returns        @true if converting was successful, @false otherwise }
    function ConvertTo(const aFormat: TglBitmapFormat): Boolean; virtual;

{$IFDEF GLB_SDL}
  public { SDL }

    { assign texture data to SDL surface
        @param aSurface SDL surface to write data to
        @returns        @true on success, @false otherwise }
    function AssignToSurface(out aSurface: PSDL_Surface): Boolean;

    { assign texture data from SDL surface
        @param aSurface SDL surface to read data from
        @returns        @true on success, @false otherwise }
    function AssignFromSurface(const aSurface: PSDL_Surface): Boolean;

    { assign alpha channel data to SDL surface
        @param aSurface SDL surface to write alpha channel data to
        @returns        @true on success, @false otherwise }
    function AssignAlphaToSurface(out aSurface: PSDL_Surface): Boolean;

    { assign alpha channel data from SDL surface
        @param aSurface SDL surface to read data from
        @param aFunc    callback to use for converting
        @param aArgs    user defined parameters (use at will)
        @returns        @true on success, @false otherwise }
    function AddAlphaFromSurface(const aSurface: PSDL_Surface; const aFunc: TglBitmapFunction = nil; const aArgs: Pointer = nil): Boolean;
{$ENDIF}

{$IFDEF GLB_DELPHI}
  public { Delphi }

    { assign texture data to TBitmap object
        @param aBitmap  TBitmap to write data to
        @returns        @true on success, @false otherwise }
    function AssignToBitmap(const aBitmap: TBitmap): Boolean;

    { assign texture data from TBitmap object
        @param aBitmap  TBitmap to read data from
        @returns        @true on success, @false otherwise }
    function AssignFromBitmap(const aBitmap: TBitmap): Boolean;

    { assign alpha channel data to TBitmap object
        @param aBitmap  TBitmap to write data to
        @returns        @true on success, @false otherwise }
    function AssignAlphaToBitmap(const aBitmap: TBitmap): Boolean;

    { assign alpha channel data from TBitmap object
        @param aBitmap  TBitmap to read data from
        @param aFunc    callback to use for converting
        @param aArgs    user defined parameters (use at will)
        @returns        @true on success, @false otherwise }
    function AddAlphaFromBitmap(const aBitmap: TBitmap; const aFunc: TglBitmapFunction = nil; const aArgs: Pointer = nil): Boolean;
{$ENDIF}

{$IFDEF GLB_LAZARUS}
  public { Lazarus }

    { assign texture data to TLazIntfImage object
        @param aImage   TLazIntfImage to write data to
        @returns        @true on success, @false otherwise }
    function AssignToLazIntfImage(const aImage: TLazIntfImage): Boolean;

    { assign texture data from TLazIntfImage object
        @param aImage   TLazIntfImage to read data from
        @returns        @true on success, @false otherwise }
    function AssignFromLazIntfImage(const aImage: TLazIntfImage): Boolean;

    { assign alpha channel data to TLazIntfImage object
        @param aImage   TLazIntfImage to write data to
        @returns        @true on success, @false otherwise }
    function AssignAlphaToLazIntfImage(const aImage: TLazIntfImage): Boolean;

    { assign alpha channel data from TLazIntfImage object
        @param aImage   TLazIntfImage to read data from
        @param aFunc    callback to use for converting
        @param aArgs    user defined parameters (use at will)
        @returns        @true on success, @false otherwise }
    function AddAlphaFromLazIntfImage(const aImage: TLazIntfImage; const aFunc: TglBitmapFunction = nil; const aArgs: Pointer = nil): Boolean;
{$ENDIF}

  public { Alpha }
    { load alpha channel data from resource
        @param aInstance  resource handle
        @param aResource  resource ID
        @param aResType   resource type
        @param aFunc      callback to use for converting
        @param aArgs      user defined parameters (use at will)
        @returns          @true on success, @false otherwise }
    function AddAlphaFromResource(const aInstance: Cardinal; aResource: String; aResType: PChar = nil; const aFunc: TglBitmapFunction = nil; const aArgs: Pointer = nil): Boolean;

    { load alpha channel data from resource ID
        @param aInstance    resource handle
        @param aResourceID  resource ID
        @param aResType     resource type
        @param aFunc        callback to use for converting
        @param aArgs        user defined parameters (use at will)
        @returns            @true on success, @false otherwise }
    function AddAlphaFromResourceID(const aInstance: Cardinal; const aResourceID: Integer; const aResType: PChar; const aFunc: TglBitmapFunction = nil; const aArgs: Pointer = nil): Boolean;

    { add alpha channel data from function
        @param aFunc  callback to get data from
        @param aArgs  user defined parameters (use at will)
        @returns      @true on success, @false otherwise }
    function AddAlphaFromFunc(const aFunc: TglBitmapFunction; const aArgs: Pointer = nil): Boolean; virtual;

    { add alpha channel data from file (macro for: new glBitmap, LoadFromFile, AddAlphaFromGlBitmap)
        @param aFilename  file to load alpha channel data from
        @param aFunc      callback to use for converting
        @param aArgs     SetFormat user defined parameters (use at will)
        @returns          @true on success, @false otherwise }
    function AddAlphaFromFile(const aFileName: String; const aFunc: TglBitmapFunction = nil; const aArgs: Pointer = nil): Boolean;

    { add alpha channel data from stream (macro for: new glBitmap, LoadFromStream, AddAlphaFromGlBitmap)
        @param aStream  stream to load alpha channel data from
        @param aFunc    callback to use for converting
        @param aArgs    user defined parameters (use at will)
        @returns        @true on success, @false otherwise }
    function AddAlphaFromStream(const aStream: TStream; const aFunc: TglBitmapFunction = nil; const aArgs: Pointer = nil): Boolean;

    { add alpha channel data from existing glBitmap object
        @param aBitmap  TglBitmap to copy alpha channel data from
        @param aFunc    callback to use for converting
        @param aArgs    user defined parameters (use at will)
        @returns        @true on success, @false otherwise }
    function AddAlphaFromDataObj(const aDataObj: TglBitmapData; aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;

    { add alpha to pixel if the pixels color is greter than the given color value
        @param aRed         red threshold (0-255)
        @param aGreen       green threshold (0-255)
        @param aBlue        blue threshold (0-255)
        @param aDeviatation accepted deviatation (0-255)
        @returns            @true on success, @false otherwise }
    function AddAlphaFromColorKey(const aRed, aGreen, aBlue: Byte; const aDeviation: Byte = 0): Boolean;

    { add alpha to pixel if the pixels color is greter than the given color value
        @param aRed         red threshold (0-Range.r)
        @param aGreen       green threshold (0-Range.g)
        @param aBlue        blue threshold (0-Range.b)
        @param aDeviatation accepted deviatation (0-max(Range.rgb))
        @returns            @true on success, @false otherwise }
    function AddAlphaFromColorKeyRange(const aRed, aGreen, aBlue: Cardinal; const aDeviation: Cardinal = 0): Boolean;

    { add alpha to pixel if the pixels color is greter than the given color value
        @param aRed         red threshold (0.0-1.0)
        @param aGreen       green threshold (0.0-1.0)
        @param aBlue        blue threshold (0.0-1.0)
        @param aDeviatation accepted deviatation (0.0-1.0)
        @returns            @true on success, @false otherwise }
    function AddAlphaFromColorKeyFloat(const aRed, aGreen, aBlue: Single; const aDeviation: Single = 0): Boolean;

    { add a constand alpha value to all pixels
        @param aAlpha alpha value to add (0-255)
        @returns      @true on success, @false otherwise }
    function AddAlphaFromValue(const aAlpha: Byte): Boolean;

    { add a constand alpha value to all pixels
        @param aAlpha alpha value to add (0-max(Range.rgb))
        @returns      @true on success, @false otherwise }
    function AddAlphaFromValueRange(const aAlpha: Cardinal): Boolean;

    { add a constand alpha value to all pixels
        @param aAlpha alpha value to add (0.0-1.0)
        @returns      @true on success, @false otherwise }
    function AddAlphaFromValueFloat(const aAlpha: Single): Boolean;

    { remove alpha channel
        @returns  @true on success, @false otherwise }
    function RemoveAlpha: Boolean; virtual;

  public { fill }
    { fill complete texture with one color
        @param aRed   red color for border (0-255)
        @param aGreen green color for border (0-255)
        @param aBlue  blue color for border (0-255)
        @param aAlpha alpha color for border (0-255) }
    procedure FillWithColor(const aRed, aGreen, aBlue: Byte; const aAlpha: Byte = 255);

    { fill complete texture with one color
        @param aRed   red color for border (0-Range.r)
        @param aGreen green color for border (0-Range.g)
        @param aBlue  blue color for border (0-Range.b)
        @param aAlpha alpha color for border (0-Range.a) }
    procedure FillWithColorRange(const aRed, aGreen, aBlue: Cardinal; const aAlpha: Cardinal = $FFFFFFFF);

    { fill complete texture with one color
        @param aRed   red color for border (0.0-1.0)
        @param aGreen green color for border (0.0-1.0)
        @param aBlue  blue color for border (0.0-1.0)
        @param aAlpha alpha color for border (0.0-1.0) }
    procedure FillWithColorFloat(const aRed, aGreen, aBlue: Single; const aAlpha: Single = 1.0);

  public { Misc }

    { set data pointer of texture data
        @param aData    pointer to new texture data
        @param aFormat  format of the data stored at aData
        @param aWidth   width of the texture data
        @param aHeight  height of the texture data }
    procedure SetData(const aData: PByte; const aFormat: TglBitmapFormat;
      const aWidth: Integer = -1; const aHeight: Integer = -1); virtual;

      { create a clone of the current object
        @returns clone of this object}
    function Clone: TglBitmapData;

    { invert color data (bitwise not)
        @param aRed     invert red channel
        @param aGreen   invert green channel
        @param aBlue    invert blue channel
        @param aAlpha   invert alpha channel }
    procedure Invert(const aRed, aGreen, aBlue, aAlpha: Boolean);

    { create normal map from texture data
        @param aFunc      normal map function to generate normalmap with
        @param aScale     scale of the normale stored in the normal map
        @param aUseAlpha  generate normalmap from alpha channel data (if present) }
    procedure GenerateNormalMap(const aFunc: TglBitmapNormalMapFunc = nm3x3;
      const aScale: Single = 2; const aUseAlpha: Boolean = false);

  public { constructor }

    { constructor - creates a texutre data object }
    constructor Create; overload;

    { constructor - creates a texture data object and loads it from a file
        @param aFilename file to load texture from }
    constructor Create(const aFileName: String); overload;

    { constructor - creates a texture data object and loads it from a stream
        @param aStream stream to load texture from }
    constructor Create(const aStream: TStream); overload;

    { constructor - creates a texture data object with the given size, format and data
        @param aSize    size of the texture
        @param aFormat  format of the given data
        @param aData    texture data - be carefull: the data will now be managed by the texture data object }
    constructor Create(const aSize: TglBitmapSize; const aFormat: TglBitmapFormat; aData: PByte = nil); overload;

    { constructor - creates a texture data object with the given size and format and uses the given callback to create the data
        @param aSize    size of the texture
        @param aFormat  format of the given data
        @param aFunc    callback to use for generating the data
        @param aArgs    user defined parameters (use at will) }
    constructor Create(const aSize: TglBitmapSize; const aFormat: TglBitmapFormat; const aFunc: TglBitmapFunction; const aArgs: Pointer = nil); overload;

    { constructor - creates a texture data object and loads it from a resource
        @param aInstance  resource handle
        @param aResource  resource indentifier
        @param aResType   resource type (if known) }
    constructor Create(const aInstance: Cardinal; const aResource: String; const aResType: PChar = nil); overload;

    { constructor - creates a texture data object and loads it from a resource
        @param aInstance    resource handle
        @param aResourceID  resource ID
        @param aResType     resource type (if known) }
    constructor Create(const aInstance: Cardinal; const aResourceID: Integer; const aResType: PChar); overload;

    { destructor }
    destructor Destroy; override;

  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  { base class for all glBitmap classes. used to manage OpenGL texture objects
    all operations on a bitmap object must be done from the render thread }
  TglBitmap = class
  protected
    fID: GLuint;                          //< name of the OpenGL texture object
    fTarget: GLuint;                      //< texture target (e.g. GL_TEXTURE_2D)
    fDeleteTextureOnFree: Boolean;        //< delete OpenGL texture object when this object is destroyed

    // texture properties
    fFilterMin: GLenum;                   //< min filter to apply to the texture
    fFilterMag: GLenum;                   //< mag filter to apply to the texture
    fWrapS: GLenum;                       //< texture wrapping for x axis
    fWrapT: GLenum;                       //< texture wrapping for y axis
    fWrapR: GLenum;                       //< texture wrapping for z axis
    fAnisotropic: Integer;                //< anisotropic level
    fBorderColor: array[0..3] of Single;  //< color of the texture border

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
    //Swizzle
    fSwizzle: array[0..3] of GLenum;      //< color channel swizzle
{$IFEND}
{$IFNDEF OPENGL_ES}
    fIsResident: GLboolean;               //< @true if OpenGL texture object has data, @false otherwise
{$ENDIF}

    fDimension: TglBitmapSize;            //< size of this texture
    fMipMap: TglBitmapMipMap;             //< mipmap type

    // CustomData
    fCustomData: Pointer;                 //< user defined data
    fCustomName: String;                  //< user defined name
    fCustomNameW: WideString;             //< user defined name
  protected
    { @returns the actual width of the texture }
    function GetWidth:  Integer; virtual;

    { @returns the actual height of the texture }
    function GetHeight: Integer; virtual;

  protected
    { set a new value for fCustomData }
    procedure SetCustomData(const aValue: Pointer);

    { set a new value for fCustomName }
    procedure SetCustomName(const aValue: String);

    { set a new value for fCustomNameW }
    procedure SetCustomNameW(const aValue: WideString);

    { set new value for fDeleteTextureOnFree }
    procedure SetDeleteTextureOnFree(const aValue: Boolean);

    { set name of OpenGL texture object }
    procedure SetID(const aValue: Cardinal);

    { set new value for fMipMap }
    procedure SetMipMap(const aValue: TglBitmapMipMap);

    { set new value for target }
    procedure SetTarget(const aValue: Cardinal);

    { set new value for fAnisotrophic }
    procedure SetAnisotropic(const aValue: Integer);

  protected
    { create OpenGL texture object (delete exisiting object if exists) }
    procedure CreateID;

    { setup texture parameters }
    procedure SetupParameters({$IFNDEF OPENGL_ES}out aBuildWithGlu: Boolean{$ENDIF});

  protected
    property Width:  Integer read GetWidth;   //< the actual width of the texture
    property Height: Integer read GetHeight;  //< the actual height of the texture

  public
    property ID:                  Cardinal  read fID                  write SetID;                  //< name of the OpenGL texture object
    property Target:              Cardinal  read fTarget              write SetTarget;              //< texture target (e.g. GL_TEXTURE_2D)
    property DeleteTextureOnFree: Boolean   read fDeleteTextureOnFree write SetDeleteTextureOnFree; //< delete texture object when this object is destroyed

    property MipMap:       TglBitmapMipMap read fMipMap      write SetMipMap;       //< mipmap type
    property Anisotropic:  Integer         read fAnisotropic write SetAnisotropic;  //< anisotropic level

    property CustomData:  Pointer    read fCustomData  write SetCustomData;   //< user defined data (use at will)
    property CustomName:  String     read fCustomName  write SetCustomName;   //< user defined name (use at will)
    property CustomNameW: WideString read fCustomNameW write SetCustomNameW;  //< user defined name (as WideString; use at will)

    property Dimension:  TglBitmapSize read fDimension;     //< size of the texture
{$IFNDEF OPENGL_ES}
    property IsResident: GLboolean read fIsResident;        //< @true if OpenGL texture object has data, @false otherwise
{$ENDIF}

    { this method is called after the constructor and sets the default values of this object }
    procedure AfterConstruction; override;

    { this method is called before the destructor and does some cleanup }
    procedure BeforeDestruction; override;

  public
{$IFNDEF OPENGL_ES}
    { set the new value for texture border color
        @param aRed   red color for border (0.0-1.0)
        @param aGreen green color for border (0.0-1.0)
        @param aBlue  blue color for border (0.0-1.0)
        @param aAlpha alpha color for border (0.0-1.0) }
    procedure SetBorderColor(const aRed, aGreen, aBlue, aAlpha: Single);
{$ENDIF}

  public
    { set new texture filer
        @param aMin   min filter
        @param aMag   mag filter }
    procedure SetFilter(const aMin, aMag: GLenum);

    { set new texture wrapping
        @param S  texture wrapping for x axis
        @param T  texture wrapping for y axis
        @param R  texture wrapping for z axis }
    procedure SetWrap(
      const S: GLenum = GL_CLAMP_TO_EDGE;
      const T: GLenum = GL_CLAMP_TO_EDGE;
      const R: GLenum = GL_CLAMP_TO_EDGE);

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
    { set new swizzle
        @param r  swizzle for red channel
        @param g  swizzle for green channel
        @param b  swizzle for blue channel
        @param a  swizzle for alpha channel }
    procedure SetSwizzle(const r, g, b, a: GLenum);
{$IFEND}

  public
    { bind texture
        @param aEnableTextureUnit   enable texture unit for this texture (e.g. glEnable(GL_TEXTURE_2D)) }
    procedure Bind(const aEnableTextureUnit: Boolean = true); virtual;

    { bind texture
        @param aDisableTextureUnit  disable texture unit for this texture (e.g. glEnable(GL_TEXTURE_2D)) }
    procedure Unbind(const aDisableTextureUnit: Boolean = true); virtual;

    { upload texture data from given data object to video card
        @param aData        texture data object that contains the actual data
        @param aCheckSize   check size before upload and throw exception if something is wrong }
    procedure UploadData(const aDataObj: TglBitmapData; const aCheckSize: Boolean = true); virtual;

{$IFNDEF OPENGL_ES}
    { download texture data from video card and store it into given data object
        @returns @true when download was successfull, @false otherwise }
    function DownloadData(const aDataObj: TglBitmapData): Boolean; virtual;
{$ENDIF}
  public
    { constructor - creates an empty texture }
    constructor Create; overload;

    { constructor - creates an texture object and uploads the given data }
    constructor Create(const aData: TglBitmapData); overload;

  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
{$IF NOT DEFINED(OPENGL_ES)}
  { wrapper class for 1-dimensional textures (OpenGL target = GL_TEXTURE_1D
    all operations on a bitmap object must be done from the render thread }
  TglBitmap1D = class(TglBitmap)
  protected

    { upload the texture data to video card
        @param aDataObj       texture data object that contains the actual data
        @param aBuildWithGlu  use glu functions to build mipmaps }
    procedure UploadDataIntern(const aDataObj: TglBitmapData; const aBuildWithGlu: Boolean);

  public
    property Width; //< actual with of the texture

    { this method is called after constructor and initializes the object }
    procedure AfterConstruction; override;

    { upload texture data from given data object to video card
        @param aData        texture data object that contains the actual data
        @param aCheckSize   check size before upload and throw exception if something is wrong }
    procedure UploadData(const aDataObj: TglBitmapData; const aCheckSize: Boolean = true); override;

  end;
{$IFEND}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  { wrapper class for 2-dimensional textures (OpenGL target = GL_TEXTURE_2D)
    all operations on a bitmap object must be done from the render thread }
  TglBitmap2D = class(TglBitmap)
  protected

    { upload the texture data to video card
        @param aDataObj       texture data object that contains the actual data
        @param aTarget        target o upload data to (e.g. GL_TEXTURE_2D)
        @param aBuildWithGlu  use glu functions to build mipmaps }
    procedure UploadDataIntern(const aDataObj: TglBitmapData; const aTarget: GLenum
      {$IFNDEF OPENGL_ES}; const aBuildWithGlu: Boolean{$ENDIF});

  public
    property Width;   //< actual width of the texture
    property Height;  //< actual height of the texture

    { this method is called after constructor and initializes the object }
    procedure AfterConstruction; override;

    { upload texture data from given data object to video card
        @param aData        texture data object that contains the actual data
        @param aCheckSize   check size before upload and throw exception if something is wrong }
    procedure UploadData(const aDataObj: TglBitmapData; const aCheckSize: Boolean = true); override;

  public

    { copy a part of the frame buffer to the texture
        @param aTop     topmost pixel to copy
        @param aLeft    leftmost pixel to copy
        @param aRight   rightmost pixel to copy
        @param aBottom  bottommost pixel to copy
        @param aFormat  format to store data in
        @param aDataObj texture data object to store the data in }
    class procedure GrabScreen(const aTop, aLeft, aRight, aBottom: Integer; const aFormat: TglBitmapFormat; const aDataObj: TglBitmapData);

  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_2_0)}
  { wrapper class for cube maps (OpenGL target = GL_TEXTURE_CUBE_MAP)
    all operations on a bitmap object must be done from the render thread }
  TglBitmapCubeMap = class(TglBitmap2D)
  protected
  {$IFNDEF OPENGL_ES}
    fGenMode: Integer;  //< generation mode for the cube map (e.g. GL_REFLECTION_MAP)
  {$ENDIF}

  public
    { this method is called after constructor and initializes the object }
    procedure AfterConstruction; override;

    { upload texture data from given data object to video card
        @param aData        texture data object that contains the actual data
        @param aCheckSize   check size before upload and throw exception if something is wrong }
    procedure UploadData(const aDataObj: TglBitmapData; const aCheckSize: Boolean = true); override;

    { upload texture data from given data object to video card
        @param aData        texture data object that contains the actual data
        @param aCubeTarget  cube map target to upload data to (e.g. GL_TEXTURE_CUBE_MAP_POSITIVE_X)
        @param aCheckSize   check size before upload and throw exception if something is wrong }
    procedure UploadCubeMap(const aDataObj: TglBitmapData; const aCubeTarget: Cardinal; const aCheckSize: Boolean);

    { bind texture
        @param aEnableTexCoordsGen  enable cube map generator
        @param aEnableTextureUnit   enable texture unit }
    procedure Bind({$IFNDEF OPENGL_ES}const aEnableTexCoordsGen: Boolean = true;{$ENDIF} const aEnableTextureUnit: Boolean = true); reintroduce; virtual;

    { unbind texture
        @param aDisableTexCoordsGen   disable cube map generator
        @param aDisableTextureUnit    disable texture unit }
    procedure Unbind({$IFNDEF OPENGL_ES}const aDisableTexCoordsGen: Boolean = true;{$ENDIF} const aDisableTextureUnit: Boolean = true); reintroduce; virtual;
  end;
{$IFEND}

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_2_0)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  { wrapper class for cube normal maps
    all operations on a bitmap object must be done from the render thread }
  TglBitmapNormalMap = class(TglBitmapCubeMap)
  public
    { this method is called after constructor and initializes the object }
    procedure AfterConstruction; override;

    { create cube normal map from texture data and upload it to video card
        @param aSize        size of each cube map texture
        @param aCheckSize   check size before upload and throw exception if something is wrong }
    procedure GenerateNormalMap(const aSize: Integer = 32; const aCheckSize: Boolean = true);
  end;
{$IFEND}

const
  NULL_SIZE: TglBitmapSize = (Fields: []; X: 0; Y: 0);

procedure glBitmapSetDefaultDeleteTextureOnFree(const aDeleteTextureOnFree: Boolean);
procedure glBitmapSetDefaultFreeDataAfterGenTexture(const aFreeData: Boolean);
procedure glBitmapSetDefaultMipmap(const aValue: TglBitmapMipMap);
procedure glBitmapSetDefaultFormat(const aFormat: TglBitmapFormat);
procedure glBitmapSetDefaultFilter(const aMin, aMag: Integer);
procedure glBitmapSetDefaultWrap(
  const S: Cardinal = GL_CLAMP_TO_EDGE;
  const T: Cardinal = GL_CLAMP_TO_EDGE;
  const R: Cardinal = GL_CLAMP_TO_EDGE);

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
procedure glBitmapSetDefaultSwizzle(const r: GLenum = GL_RED; g: GLenum = GL_GREEN; b: GLenum = GL_BLUE; a: GLenum = GL_ALPHA);
{$IFEND}

function glBitmapGetDefaultDeleteTextureOnFree: Boolean;
function glBitmapGetDefaultFreeDataAfterGenTexture: Boolean;
function glBitmapGetDefaultMipmap: TglBitmapMipMap;
function glBitmapGetDefaultFormat: TglBitmapFormat;
procedure glBitmapGetDefaultFilter(var aMin, aMag: Cardinal);
procedure glBitmapGetDefaultTextureWrap(var S, T, R: Cardinal);
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
procedure glBitmapGetDefaultSwizzle(var r, g, b, a: GLenum);
{$IFEND}

function glBitmapSize(X: Integer = -1; Y: Integer = -1): TglBitmapSize;
function glBitmapPosition(X: Integer = -1; Y: Integer = -1): TglBitmapPixelPosition;
function glBitmapRec4ub(const r, g, b, a: Byte): TglBitmapRec4ub;
function glBitmapRec4ui(const r, g, b, a: Cardinal): TglBitmapRec4ui;
function glBitmapRec4ul(const r, g, b, a: QWord): TglBitmapRec4ul;
function glBitmapRec4ubCompare(const r1, r2: TglBitmapRec4ub): Boolean;
function glBitmapRec4uiCompare(const r1, r2: TglBitmapRec4ui): Boolean;

function glBitmapCreateTestData(const aFormat: TglBitmapFormat): TglBitmapData;

{$IFDEF GLB_DELPHI}
function CreateGrayPalette: HPALETTE;
{$ENDIF}

implementation

uses
  Math, syncobjs, typinfo
  {$IF DEFINED(GLB_SUPPORT_JPEG_READ) AND DEFINED(GLB_LAZ_JPEG)}, FPReadJPEG{$IFEND};


var
  glBitmapDefaultDeleteTextureOnFree: Boolean;
  glBitmapDefaultFreeDataAfterGenTextures: Boolean;
  glBitmapDefaultFormat: TglBitmapFormat;
  glBitmapDefaultMipmap: TglBitmapMipMap;
  glBitmapDefaultFilterMin: Cardinal;
  glBitmapDefaultFilterMag: Cardinal;
  glBitmapDefaultWrapS: Cardinal;
  glBitmapDefaultWrapT: Cardinal;
  glBitmapDefaultWrapR: Cardinal;
  glDefaultSwizzle: array[0..3] of GLenum;

////////////////////////////////////////////////////////////////////////////////////////////////////
type
  TFormatDescriptor = class(TglBitmapFormatDescriptor)
  public
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); virtual; abstract;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); virtual; abstract;

    function CreateMappingData: Pointer; virtual;
    procedure FreeMappingData(var aMappingData: Pointer); virtual;

    function IsEmpty: Boolean; virtual;
    function MaskMatch(const aMask: TglBitmapRec4ul): Boolean; virtual;

    procedure PreparePixel(out aPixel: TglBitmapPixelData); virtual;

    constructor Create; virtual;
  public
    class procedure Init;
    class function Get(const aFormat: TglBitmapFormat): TFormatDescriptor;
    class function GetAlpha(const aFormat: TglBitmapFormat): TFormatDescriptor;
    class function GetFromMask(const aMask: TglBitmapRec4ul; const aBitCount: Integer = 0): TFormatDescriptor;
    class function GetFromPrecShift(const aPrec, aShift: TglBitmapRec4ub; const aBitCount: Integer): TFormatDescriptor;
    class procedure Clear;
    class procedure Finalize;
  end;
  TFormatDescriptorClass = class of TFormatDescriptor;

  TfdEmpty = class(TFormatDescriptor);

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TfdAlphaUB1 = class(TFormatDescriptor) //1* unsigned byte
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdLuminanceUB1 = class(TFormatDescriptor) //1* unsigned byte
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdUniversalUB1 = class(TFormatDescriptor) //1* unsigned byte
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdLuminanceAlphaUB2 = class(TfdLuminanceUB1) //2* unsigned byte
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdRGBub3 = class(TFormatDescriptor) //3* unsigned byte
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdBGRub3 = class(TFormatDescriptor) //3* unsigned byte (inverse)
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdRGBAub4 = class(TfdRGBub3) //3* unsigned byte
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdBGRAub4 = class(TfdBGRub3) //3* unsigned byte (inverse)
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TfdAlphaUS1 = class(TFormatDescriptor) //1* unsigned short
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdLuminanceUS1 = class(TFormatDescriptor) //1* unsigned short
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdUniversalUS1 = class(TFormatDescriptor) //1* unsigned short
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdDepthUS1 = class(TFormatDescriptor) //1* unsigned short
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdLuminanceAlphaUS2 = class(TfdLuminanceUS1) //2* unsigned short
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdRGBus3 = class(TFormatDescriptor) //3* unsigned short
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdBGRus3 = class(TFormatDescriptor) //3* unsigned short (inverse)
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdRGBAus4 = class(TfdRGBus3) //4* unsigned short
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdARGBus4 = class(TfdRGBus3) //4* unsigned short
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdBGRAus4 = class(TfdBGRus3) //4* unsigned short (inverse)
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdABGRus4 = class(TfdBGRus3) //4* unsigned short (inverse)
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TfdUniversalUI1 = class(TFormatDescriptor) //1* unsigned int
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

  TfdDepthUI1 = class(TFormatDescriptor) //1* unsigned int
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TfdAlpha4ub1 = class(TfdAlphaUB1)
    procedure SetValues; override;
  end;

  TfdAlpha8ub1 = class(TfdAlphaUB1)
    procedure SetValues; override;
  end;

  TfdAlpha16us1 = class(TfdAlphaUS1)
    procedure SetValues; override;
  end;

  TfdLuminance4ub1 = class(TfdLuminanceUB1)
    procedure SetValues; override;
  end;

  TfdLuminance8ub1 = class(TfdLuminanceUB1)
    procedure SetValues; override;
  end;

  TfdLuminance16us1 = class(TfdLuminanceUS1)
    procedure SetValues; override;
  end;

  TfdLuminance4Alpha4ub2 = class(TfdLuminanceAlphaUB2)
    procedure SetValues; override;
  end;

  TfdLuminance6Alpha2ub2 = class(TfdLuminanceAlphaUB2)
    procedure SetValues; override;
  end;

  TfdLuminance8Alpha8ub2 = class(TfdLuminanceAlphaUB2)
    procedure SetValues; override;
  end;

  TfdLuminance12Alpha4us2 = class(TfdLuminanceAlphaUS2)
    procedure SetValues; override;
  end;

  TfdLuminance16Alpha16us2 = class(TfdLuminanceAlphaUS2)
    procedure SetValues; override;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TfdR3G3B2ub1 = class(TfdUniversalUB1)
    procedure SetValues; override;
  end;

  TfdRGBX4us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdXRGB4us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdR5G6B5us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdRGB5X1us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdX1RGB5us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdRGB8ub3 = class(TfdRGBub3)
    procedure SetValues; override;
  end;

  TfdRGBX8ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdXRGB8ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdRGB10X2ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdX2RGB10ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdRGB16us3 = class(TfdRGBus3)
    procedure SetValues; override;
  end;

  TfdRGBA4us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdARGB4us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdRGB5A1us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdA1RGB5us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdRGBA8ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdARGB8ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdRGBA8ub4 = class(TfdRGBAub4)
    procedure SetValues; override;
  end;

  TfdRGB10A2ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdA2RGB10ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdRGBA16us4 = class(TfdRGBAus4)
    procedure SetValues; override;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TfdBGRX4us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdXBGR4us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdB5G6R5us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdBGR5X1us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdX1BGR5us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdBGR8ub3 = class(TfdBGRub3)
    procedure SetValues; override;
  end;

  TfdBGRX8ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdXBGR8ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdBGR10X2ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdX2BGR10ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdBGR16us3 = class(TfdBGRus3)
    procedure SetValues; override;
  end;

  TfdBGRA4us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdABGR4us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdBGR5A1us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdA1BGR5us1 = class(TfdUniversalUS1)
    procedure SetValues; override;
  end;

  TfdBGRA8ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdABGR8ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdBGRA8ub4 = class(TfdBGRAub4)
    procedure SetValues; override;
  end;

  TfdBGR10A2ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdA2BGR10ui1 = class(TfdUniversalUI1)
    procedure SetValues; override;
  end;

  TfdBGRA16us4 = class(TfdBGRAus4)
    procedure SetValues; override;
  end;

  TfdDepth16us1 = class(TfdDepthUS1)
    procedure SetValues; override;
  end;

  TfdDepth24ui1 = class(TfdDepthUI1)
    procedure SetValues; override;
  end;

  TfdDepth32ui1 = class(TfdDepthUI1)
    procedure SetValues; override;
  end;

  TfdS3tcDtx1RGBA = class(TFormatDescriptor)
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
    procedure SetValues; override;
  end;

  TfdS3tcDtx3RGBA = class(TFormatDescriptor)
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
    procedure SetValues; override;
  end;

  TfdS3tcDtx5RGBA = class(TFormatDescriptor)
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
    procedure SetValues; override;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TbmpBitfieldFormat = class(TFormatDescriptor)
  public
    procedure SetCustomValues(const aBPP: Integer; aMask: TglBitmapRec4ul); overload;
    procedure SetCustomValues(const aBBP: Integer; const aPrec, aShift: TglBitmapRec4ub); overload;
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TbmpColorTableEnty = packed record
    b, g, r, a: Byte;
  end;
  TbmpColorTable = array of TbmpColorTableEnty;
  TbmpColorTableFormat = class(TFormatDescriptor)
  private
    fColorTable: TbmpColorTable;
  protected
    procedure SetValues; override;
  public
    property ColorTable:   TbmpColorTable  read fColorTable   write fColorTable;

    procedure SetCustomValues(const aFormat: TglBitmapFormat; const aBPP: Integer; const aPrec, aShift: TglBitmapRec4ub); overload;
    procedure CalcValues;
    procedure CreateColorTable;

    function CreateMappingData: Pointer; override;
    procedure Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer); override;
    procedure Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer); override;
    destructor Destroy; override;
  end;

const
  LUMINANCE_WEIGHT_R = 0.30;
  LUMINANCE_WEIGHT_G = 0.59;
  LUMINANCE_WEIGHT_B = 0.11;

  ALPHA_WEIGHT_R = 0.30;
  ALPHA_WEIGHT_G = 0.59;
  ALPHA_WEIGHT_B = 0.11;

  DEPTH_WEIGHT_R = 0.333333333;
  DEPTH_WEIGHT_G = 0.333333333;
  DEPTH_WEIGHT_B = 0.333333333;

  FORMAT_DESCRIPTOR_CLASSES: array[TglBitmapFormat] of TFormatDescriptorClass = (
    TfdEmpty,

    TfdAlpha4ub1,
    TfdAlpha8ub1,
    TfdAlpha16us1,

    TfdLuminance4ub1,
    TfdLuminance8ub1,
    TfdLuminance16us1,

    TfdLuminance4Alpha4ub2,
    TfdLuminance6Alpha2ub2,
    TfdLuminance8Alpha8ub2,
    TfdLuminance12Alpha4us2,
    TfdLuminance16Alpha16us2,

    TfdR3G3B2ub1,
    TfdRGBX4us1,
    TfdXRGB4us1,
    TfdR5G6B5us1,
    TfdRGB5X1us1,
    TfdX1RGB5us1,
    TfdRGB8ub3,
    TfdRGBX8ui1,
    TfdXRGB8ui1,
    TfdRGB10X2ui1,
    TfdX2RGB10ui1,
    TfdRGB16us3,

    TfdRGBA4us1,
    TfdARGB4us1,
    TfdRGB5A1us1,
    TfdA1RGB5us1,
    TfdRGBA8ui1,
    TfdARGB8ui1,
    TfdRGBA8ub4,
    TfdRGB10A2ui1,
    TfdA2RGB10ui1,
    TfdRGBA16us4,

    TfdBGRX4us1,
    TfdXBGR4us1,
    TfdB5G6R5us1,
    TfdBGR5X1us1,
    TfdX1BGR5us1,
    TfdBGR8ub3,
    TfdBGRX8ui1,
    TfdXBGR8ui1,
    TfdBGR10X2ui1,
    TfdX2BGR10ui1,
    TfdBGR16us3,

    TfdBGRA4us1,
    TfdABGR4us1,
    TfdBGR5A1us1,
    TfdA1BGR5us1,
    TfdBGRA8ui1,
    TfdABGR8ui1,
    TfdBGRA8ub4,
    TfdBGR10A2ui1,
    TfdA2BGR10ui1,
    TfdBGRA16us4,

    TfdDepth16us1,
    TfdDepth24ui1,
    TfdDepth32ui1,

    TfdS3tcDtx1RGBA,
    TfdS3tcDtx3RGBA,
    TfdS3tcDtx5RGBA
  );

var
  FormatDescriptorCS: TCriticalSection;
  FormatDescriptors: array[TglBitmapFormat] of TFormatDescriptor;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor EglBitmapUnsupportedFormat.Create(const aFormat: TglBitmapFormat);
begin
  inherited Create('unsupported format: ' + GetEnumName(TypeInfo(TglBitmapFormat), Integer(aFormat)));
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor EglBitmapUnsupportedFormat.Create(const aMsg: String; const aFormat: TglBitmapFormat);
begin
  inherited Create(aMsg + GetEnumName(TypeInfo(TglBitmapFormat), Integer(aFormat)));
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapSize(X: Integer; Y: Integer): TglBitmapSize;
begin
  result.Fields := [];
  if (X >= 0) then
    result.Fields := result.Fields + [ffX];
  if (Y >= 0) then
    result.Fields := result.Fields + [ffY];
  result.X := Max(0, X);
  result.Y := Max(0, Y);
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapPosition(X: Integer; Y: Integer): TglBitmapPixelPosition;
begin
  result := glBitmapSize(X, Y);
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapRec4ub(const r, g, b, a: Byte): TglBitmapRec4ub;
begin
  result.r := r;
  result.g := g;
  result.b := b;
  result.a := a;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapRec4ui(const r, g, b, a: Cardinal): TglBitmapRec4ui;
begin
  result.r := r;
  result.g := g;
  result.b := b;
  result.a := a;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapRec4ul(const r, g, b, a: QWord): TglBitmapRec4ul;
begin
  result.r := r;
  result.g := g;
  result.b := b;
  result.a := a;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapRec4ubCompare(const r1, r2: TglBitmapRec4ub): Boolean;
var
  i: Integer;
begin
  result := false;
  for i := 0 to high(r1.arr) do
    if (r1.arr[i] <> r2.arr[i]) then
      exit;
  result := true;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapRec4uiCompare(const r1, r2: TglBitmapRec4ui): Boolean;
var
  i: Integer;
begin
  result := false;
  for i := 0 to high(r1.arr) do
    if (r1.arr[i] <> r2.arr[i]) then
      exit;
  result := true;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapCreateTestData(const aFormat: TglBitmapFormat): TglBitmapData;
var
  desc: TFormatDescriptor;
  p, tmp: PByte;
  x, y, i: Integer;
  md: Pointer;
  px: TglBitmapPixelData;
begin
  result := nil;
  desc := TFormatDescriptor.Get(aFormat);
  if (desc.IsCompressed) or (desc.glFormat = 0) then
    exit;

  p := GetMemory(ceil(25 * desc.BytesPerPixel)); // 5 x 5 pixel
  md := desc.CreateMappingData;
  try
    tmp := p;
    desc.PreparePixel(px);
    for y := 0 to 4 do
      for x := 0 to 4 do begin
        px.Data := glBitmapRec4ui(0, 0, 0, 0);
        for i := 0 to 3 do begin
          if ((y < 3) and (y = i)) or
             ((y = 3) and (i < 3)) or
             ((y = 4) and (i = 3))
          then
            px.Data.arr[i] := Trunc(px.Range.arr[i] / 4 * x)
          else if ((y < 4) and (i = 3)) or
                  ((y = 4) and (i < 3))
          then
            px.Data.arr[i] := px.Range.arr[i]
          else
            px.Data.arr[i] := 0; //px.Range.arr[i];
        end;
        desc.Map(px, tmp, md);
      end;
  finally
    desc.FreeMappingData(md);
  end;

  result := TglBitmapData.Create(glBitmapPosition(5, 5), aFormat, p);
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapShiftRec(const r, g, b, a: Byte): TglBitmapRec4ub;
begin
  result.r := r;
  result.g := g;
  result.b := b;
  result.a := a;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function FormatGetSupportedFiles(const aFormat: TglBitmapFormat): TglBitmapFileTypes;
begin
  result := [];

  if (aFormat in [
        //8bpp
        tfAlpha4ub1, tfAlpha8ub1,
        tfLuminance4ub1, tfLuminance8ub1, tfR3G3B2ub1,

        //16bpp
        tfLuminance4Alpha4ub2, tfLuminance6Alpha2ub2, tfLuminance8Alpha8ub2,
        tfRGBX4us1, tfXRGB4us1, tfRGB5X1us1, tfX1RGB5us1, tfR5G6B5us1, tfRGB5A1us1, tfA1RGB5us1, tfRGBA4us1, tfARGB4us1,
        tfBGRX4us1, tfXBGR4us1, tfBGR5X1us1, tfX1BGR5us1, tfB5G6R5us1, tfBGR5A1us1, tfA1BGR5us1, tfBGRA4us1, tfABGR4us1,

        //24bpp
        tfBGR8ub3, tfRGB8ub3,

        //32bpp
        tfRGBX8ui1, tfXRGB8ui1, tfRGB10X2ui1, tfX2RGB10ui1, tfRGBA8ui1, tfARGB8ui1, tfRGBA8ub4, tfRGB10A2ui1, tfA2RGB10ui1,
        tfBGRX8ui1, tfXBGR8ui1, tfBGR10X2ui1, tfX2BGR10ui1, tfBGRA8ui1, tfABGR8ui1, tfBGRA8ub4, tfBGR10A2ui1, tfA2BGR10ui1])
  then
    result := result + [ ftBMP ];

  if (aFormat in [
        //8bbp
        tfAlpha4ub1, tfAlpha8ub1, tfLuminance4ub1, tfLuminance8ub1,

        //16bbp
        tfAlpha16us1, tfLuminance16us1,
        tfLuminance4Alpha4ub2, tfLuminance6Alpha2ub2, tfLuminance8Alpha8ub2,
        tfX1RGB5us1, tfARGB4us1, tfA1RGB5us1, tfDepth16us1,

        //24bbp
        tfBGR8ub3,

        //32bbp
        tfX2RGB10ui1, tfARGB8ui1, tfBGRA8ub4, tfA2RGB10ui1,
        tfDepth24ui1, tfDepth32ui1])
  then
    result := result + [ftTGA];

  if not (aFormat in [tfEmpty, tfRGB16us3, tfBGR16us3]) then
    result := result + [ftDDS];

{$IFDEF GLB_SUPPORT_PNG_WRITE}
  if aFormat in [
      tfAlpha8ub1, tfLuminance8ub1, tfLuminance8Alpha8ub2,
      tfRGB8ub3, tfRGBA8ui1,
      tfBGR8ub3, tfBGRA8ui1] then
    result := result + [ftPNG];
{$ENDIF}

{$IFDEF GLB_SUPPORT_JPEG_WRITE}
  if aFormat in [tfAlpha8ub1, tfLuminance8ub1, tfRGB8ub3, tfBGR8ub3] then
    result := result + [ftJPEG];
{$ENDIF}
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function IsPowerOfTwo(aNumber: Integer): Boolean;
begin
  while (aNumber and 1) = 0 do
    aNumber := aNumber shr 1;
  result := aNumber = 1;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function GetTopMostBit(aBitSet: QWord): Integer;
begin
  result := 0;
  while aBitSet > 0 do begin
    inc(result);
    aBitSet := aBitSet shr 1;
  end;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function CountSetBits(aBitSet: QWord): Integer;
begin
  result := 0;
  while aBitSet > 0 do begin
    if (aBitSet and 1) = 1 then
      inc(result);
    aBitSet := aBitSet shr 1;
  end;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function LuminanceWeight(const aPixel: TglBitmapPixelData): Cardinal;
begin
  result := Trunc(
    LUMINANCE_WEIGHT_R * aPixel.Data.r +
    LUMINANCE_WEIGHT_G * aPixel.Data.g +
    LUMINANCE_WEIGHT_B * aPixel.Data.b);
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function DepthWeight(const aPixel: TglBitmapPixelData): Cardinal;
begin
  result := Trunc(
    DEPTH_WEIGHT_R * aPixel.Data.r +
    DEPTH_WEIGHT_G * aPixel.Data.g +
    DEPTH_WEIGHT_B * aPixel.Data.b);
end;

{$IFDEF GLB_SDL_IMAGE}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// SDL Image Helper /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapRWseek(context: PSDL_RWops; offset: Integer; whence: Integer): Integer; cdecl;
begin
  result := TStream(context^.unknown.data1).Seek(offset, whence);
end;

function glBitmapRWread(context: PSDL_RWops; Ptr: Pointer; size: Integer; maxnum : Integer): Integer; cdecl;
begin
  result := TStream(context^.unknown.data1).Read(Ptr^, size * maxnum);
end;

function glBitmapRWwrite(context: PSDL_RWops; Ptr: Pointer; size: Integer; num: Integer): Integer; cdecl;
begin
  result := TStream(context^.unknown.data1).Write(Ptr^, size * num);
end;

function glBitmapRWclose(context: PSDL_RWops): Integer; cdecl;
begin
  result := 0;
end;

function glBitmapCreateRWops(Stream: TStream): PSDL_RWops;
begin
  result := SDL_AllocRW;

  if result = nil then
    raise EglBitmap.Create('glBitmapCreateRWops - SDL_AllocRW failed.');

  result^.seek := glBitmapRWseek;
  result^.read := glBitmapRWread;
  result^.write := glBitmapRWwrite;
  result^.close := glBitmapRWclose;
  result^.unknown.data1 := Stream;
end;
{$ENDIF}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapSetDefaultDeleteTextureOnFree(const aDeleteTextureOnFree: Boolean);
begin
  glBitmapDefaultDeleteTextureOnFree := aDeleteTextureOnFree;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapSetDefaultFreeDataAfterGenTexture(const aFreeData: Boolean);
begin
  glBitmapDefaultFreeDataAfterGenTextures := aFreeData;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapSetDefaultMipmap(const aValue: TglBitmapMipMap);
begin
  glBitmapDefaultMipmap := aValue;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapSetDefaultFormat(const aFormat: TglBitmapFormat);
begin
  glBitmapDefaultFormat := aFormat;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapSetDefaultFilter(const aMin, aMag: Integer);
begin
  glBitmapDefaultFilterMin := aMin;
  glBitmapDefaultFilterMag := aMag;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapSetDefaultWrap(const S: Cardinal = GL_CLAMP_TO_EDGE; const T: Cardinal = GL_CLAMP_TO_EDGE; const R: Cardinal = GL_CLAMP_TO_EDGE);
begin
  glBitmapDefaultWrapS := S;
  glBitmapDefaultWrapT := T;
  glBitmapDefaultWrapR := R;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
procedure glBitmapSetDefaultSwizzle(const r: GLenum = GL_RED; g: GLenum = GL_GREEN; b: GLenum = GL_BLUE; a: GLenum = GL_ALPHA);
begin
  glDefaultSwizzle[0] := r;
  glDefaultSwizzle[1] := g;
  glDefaultSwizzle[2] := b;
  glDefaultSwizzle[3] := a;
end;
{$IFEND}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapGetDefaultDeleteTextureOnFree: Boolean;
begin
  result := glBitmapDefaultDeleteTextureOnFree;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapGetDefaultFreeDataAfterGenTexture: Boolean;
begin
  result := glBitmapDefaultFreeDataAfterGenTextures;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapGetDefaultMipmap: TglBitmapMipMap;
begin
  result := glBitmapDefaultMipmap;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmapGetDefaultFormat: TglBitmapFormat;
begin
  result := glBitmapDefaultFormat;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapGetDefaultFilter(var aMin, aMag: Cardinal);
begin
  aMin := glBitmapDefaultFilterMin;
  aMag := glBitmapDefaultFilterMag;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapGetDefaultTextureWrap(var S, T, R: Cardinal);
begin
  S := glBitmapDefaultWrapS;
  T := glBitmapDefaultWrapT;
  R := glBitmapDefaultWrapR;
end;

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapGetDefaultSwizzle(var r, g, b, a: GLenum);
begin
  r := glDefaultSwizzle[0];
  g := glDefaultSwizzle[1];
  b := glDefaultSwizzle[2];
  a := glDefaultSwizzle[3];
end;
{$IFEND}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TFormatDescriptor///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TFormatDescriptor.CreateMappingData: Pointer;
begin
  result := nil;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TFormatDescriptor.FreeMappingData(var aMappingData: Pointer);
begin
  //DUMMY
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TFormatDescriptor.IsEmpty: Boolean;
begin
  result := (fFormat = tfEmpty);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TFormatDescriptor.MaskMatch(const aMask: TglBitmapRec4ul): Boolean;
var
  i: Integer;
  m: TglBitmapRec4ul;
begin
  result := false;
  if (aMask.r = 0) and (aMask.g = 0) and (aMask.b = 0) and (aMask.a = 0) then
    raise EglBitmap.Create('FormatCheckFormat - All Masks are 0');
  m := Mask;
  for i := 0 to 3 do
    if (aMask.arr[i] <> m.arr[i]) then
      exit;
  result := true;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TFormatDescriptor.PreparePixel(out aPixel: TglBitmapPixelData);
begin
  FillChar(aPixel{%H-}, SizeOf(aPixel), 0);
  aPixel.Data   := Range;
  aPixel.Format := fFormat;
  aPixel.Range  := Range;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TFormatDescriptor.Create;
begin
  inherited Create;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdAlpha_UB1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdAlphaUB1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  aData^ := aPixel.Data.a;
  inc(aData);
end;

procedure TfdAlphaUB1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.r := 0;
  aPixel.Data.g := 0;
  aPixel.Data.b := 0;
  aPixel.Data.a := aData^;
  inc(aData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdLuminance_UB1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdLuminanceUB1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  aData^ := LuminanceWeight(aPixel);
  inc(aData);
end;

procedure TfdLuminanceUB1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.r := aData^;
  aPixel.Data.g := aData^;
  aPixel.Data.b := aData^;
  aPixel.Data.a := 0;
  inc(aData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdUniversal_UB1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdUniversalUB1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
var
  i: Integer;
begin
  aData^ := 0;
  for i := 0 to 3 do
    if (Range.arr[i] > 0) then
      aData^ := aData^ or ((aPixel.Data.arr[i] and Range.arr[i]) shl fShift.arr[i]);
  inc(aData);
end;

procedure TfdUniversalUB1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
var
  i: Integer;
begin
  for i := 0 to 3 do
    aPixel.Data.arr[i] := (aData^ shr fShift.arr[i]) and Range.arr[i];
  inc(aData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdLuminanceAlpha_UB2///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdLuminanceAlphaUB2.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  inherited Map(aPixel, aData, aMapData);
  aData^ := aPixel.Data.a;
  inc(aData);
end;

procedure TfdLuminanceAlphaUB2.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  inherited Unmap(aData, aPixel, aMapData);
  aPixel.Data.a := aData^;
  inc(aData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdRGB_UB3//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdRGBub3.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  aData^ := aPixel.Data.r;
  inc(aData);
  aData^ := aPixel.Data.g;
  inc(aData);
  aData^ := aPixel.Data.b;
  inc(aData);
end;

procedure TfdRGBub3.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.r := aData^;
  inc(aData);
  aPixel.Data.g := aData^;
  inc(aData);
  aPixel.Data.b := aData^;
  inc(aData);
  aPixel.Data.a := 0;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdBGR_UB3//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdBGRub3.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  aData^ := aPixel.Data.b;
  inc(aData);
  aData^ := aPixel.Data.g;
  inc(aData);
  aData^ := aPixel.Data.r;
  inc(aData);
end;

procedure TfdBGRub3.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.b := aData^;
  inc(aData);
  aPixel.Data.g := aData^;
  inc(aData);
  aPixel.Data.r := aData^;
  inc(aData);
  aPixel.Data.a := 0;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdRGBA_UB4//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdRGBAub4.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  inherited Map(aPixel, aData, aMapData);
  aData^ := aPixel.Data.a;
  inc(aData);
end;

procedure TfdRGBAub4.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  inherited Unmap(aData, aPixel, aMapData);
  aPixel.Data.a := aData^;
  inc(aData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdBGRA_UB4//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdBGRAub4.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  inherited Map(aPixel, aData, aMapData);
  aData^ := aPixel.Data.a;
  inc(aData);
end;

procedure TfdBGRAub4.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  inherited Unmap(aData, aPixel, aMapData);
  aPixel.Data.a := aData^;
  inc(aData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdAlpha_US1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdAlphaUS1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  PWord(aData)^ := aPixel.Data.a;
  inc(aData, 2);
end;

procedure TfdAlphaUS1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.r := 0;
  aPixel.Data.g := 0;
  aPixel.Data.b := 0;
  aPixel.Data.a := PWord(aData)^;
  inc(aData, 2);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdLuminance_US1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdLuminanceUS1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  PWord(aData)^ := LuminanceWeight(aPixel);
  inc(aData, 2);
end;

procedure TfdLuminanceUS1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.r := PWord(aData)^;
  aPixel.Data.g := PWord(aData)^;
  aPixel.Data.b := PWord(aData)^;
  aPixel.Data.a := 0;
  inc(aData, 2);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdUniversal_US1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdUniversalUS1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
var
  i: Integer;
begin
  PWord(aData)^ := 0;
  for i := 0 to 3 do
    if (Range.arr[i] > 0) then
      PWord(aData)^ := PWord(aData)^ or ((aPixel.Data.arr[i] and Range.arr[i]) shl fShift.arr[i]);
  inc(aData, 2);
end;

procedure TfdUniversalUS1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
var
  i: Integer;
begin
  for i := 0 to 3 do
    aPixel.Data.arr[i] := (PWord(aData)^ shr fShift.arr[i]) and Range.arr[i];
  inc(aData, 2);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdDepth_US1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdDepthUS1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  PWord(aData)^ := DepthWeight(aPixel);
  inc(aData, 2);
end;

procedure TfdDepthUS1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.r := PWord(aData)^;
  aPixel.Data.g := PWord(aData)^;
  aPixel.Data.b := PWord(aData)^;
  aPixel.Data.a := PWord(aData)^;;
  inc(aData, 2);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdLuminanceAlpha_US2///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdLuminanceAlphaUS2.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  inherited Map(aPixel, aData, aMapData);
  PWord(aData)^ := aPixel.Data.a;
  inc(aData, 2);
end;

procedure TfdLuminanceAlphaUS2.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  inherited Unmap(aData, aPixel, aMapData);
  aPixel.Data.a := PWord(aData)^;
  inc(aData, 2);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdRGB_US3//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdRGBus3.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  PWord(aData)^ := aPixel.Data.r;
  inc(aData, 2);
  PWord(aData)^ := aPixel.Data.g;
  inc(aData, 2);
  PWord(aData)^ := aPixel.Data.b;
  inc(aData, 2);
end;

procedure TfdRGBus3.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.r := PWord(aData)^;
  inc(aData, 2);
  aPixel.Data.g := PWord(aData)^;
  inc(aData, 2);
  aPixel.Data.b := PWord(aData)^;
  inc(aData, 2);
  aPixel.Data.a := 0;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdBGR_US3//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdBGRus3.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  PWord(aData)^ := aPixel.Data.b;
  inc(aData, 2);
  PWord(aData)^ := aPixel.Data.g;
  inc(aData, 2);
  PWord(aData)^ := aPixel.Data.r;
  inc(aData, 2);
end;

procedure TfdBGRus3.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.b := PWord(aData)^;
  inc(aData, 2);
  aPixel.Data.g := PWord(aData)^;
  inc(aData, 2);
  aPixel.Data.r := PWord(aData)^;
  inc(aData, 2);
  aPixel.Data.a := 0;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdRGBA_US4/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdRGBAus4.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  inherited Map(aPixel, aData, aMapData);
  PWord(aData)^ := aPixel.Data.a;
  inc(aData, 2);
end;

procedure TfdRGBAus4.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  inherited Unmap(aData, aPixel, aMapData);
  aPixel.Data.a := PWord(aData)^;
  inc(aData, 2);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdARGB_US4/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdARGBus4.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  PWord(aData)^ := aPixel.Data.a;
  inc(aData, 2);
  inherited Map(aPixel, aData, aMapData);
end;

procedure TfdARGBus4.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.a := PWord(aData)^;
  inc(aData, 2);
  inherited Unmap(aData, aPixel, aMapData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdBGRA_US4/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdBGRAus4.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  inherited Map(aPixel, aData, aMapData);
  PWord(aData)^ := aPixel.Data.a;
  inc(aData, 2);
end;

procedure TfdBGRAus4.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  inherited Unmap(aData, aPixel, aMapData);
  aPixel.Data.a := PWord(aData)^;
  inc(aData, 2);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdABGR_US4/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdABGRus4.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  PWord(aData)^ := aPixel.Data.a;
  inc(aData, 2);
  inherited Map(aPixel, aData, aMapData);
end;

procedure TfdABGRus4.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.a := PWord(aData)^;
  inc(aData, 2);
  inherited Unmap(aData, aPixel, aMapData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdUniversal_UI1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdUniversalUI1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
var
  i: Integer;
begin
  PCardinal(aData)^ := 0;
  for i := 0 to 3 do
    if (Range.arr[i] > 0) then
      PCardinal(aData)^ := PCardinal(aData)^ or ((aPixel.Data.arr[i] and Range.arr[i]) shl fShift.arr[i]);
  inc(aData, 4);
end;

procedure TfdUniversalUI1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
var
  i: Integer;
begin
  for i := 0 to 3 do
    aPixel.Data.arr[i] := (PCardinal(aData)^ shr fShift.arr[i]) and Range.arr[i];
  inc(aData, 2);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdDepth_UI1////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdDepthUI1.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  PCardinal(aData)^ := DepthWeight(aPixel);
  inc(aData, 4);
end;

procedure TfdDepthUI1.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  aPixel.Data.r := PCardinal(aData)^;
  aPixel.Data.g := PCardinal(aData)^;
  aPixel.Data.b := PCardinal(aData)^;
  aPixel.Data.a := PCardinal(aData)^;
  inc(aData, 4);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdAlpha4ub1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 8;
  fFormat           := tfAlpha4ub1;
  fWithAlpha        := tfAlpha4ub1;
  fPrecision        := glBitmapRec4ub(0, 0, 0, 8);
  fShift            := glBitmapRec4ub(0, 0, 0, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfAlpha4ub1;
  fglFormat         := GL_ALPHA;
  fglInternalFormat := GL_ALPHA4;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := tfAlpha8ub1;
{$ENDIF}
end;

procedure TfdAlpha8ub1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 8;
  fFormat           := tfAlpha8ub1;
  fWithAlpha        := tfAlpha8ub1;
  fPrecision        := glBitmapRec4ub(0, 0, 0, 8);
  fShift            := glBitmapRec4ub(0, 0, 0, 0);
  fOpenGLFormat     := tfAlpha8ub1;
  fglFormat         := GL_ALPHA;
  fglInternalFormat := {$IFNDEF OPENGL_ES}GL_ALPHA8{$ELSE}GL_ALPHA{$ENDIF};
  fglDataFormat     := GL_UNSIGNED_BYTE;
end;

procedure TfdAlpha16us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfAlpha16us1;
  fWithAlpha        := tfAlpha16us1;
  fPrecision        := glBitmapRec4ub(0, 0, 0, 16);
  fShift            := glBitmapRec4ub(0, 0, 0,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfAlpha16us1;
  fglFormat         := GL_ALPHA;
  fglInternalFormat := GL_ALPHA16;
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$ELSE}
  fOpenGLFormat     := tfAlpha8ub1;
{$ENDIF}
end;

procedure TfdLuminance4ub1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 8;
  fFormat           := tfLuminance4ub1;
  fWithAlpha        := tfLuminance4Alpha4ub2;
  fWithoutAlpha     := tfLuminance4ub1;
  fPrecision        := glBitmapRec4ub(8, 8, 8, 0);
  fShift            := glBitmapRec4ub(0, 0, 0, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfLuminance4ub1;
  fglFormat         := GL_LUMINANCE;
  fglInternalFormat := GL_LUMINANCE4;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := tfLuminance8ub1;
{$ENDIF}
end;

procedure TfdLuminance8ub1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 8;
  fFormat           := tfLuminance8ub1;
  fWithAlpha        := tfLuminance8Alpha8ub2;
  fWithoutAlpha     := tfLuminance8ub1;
  fOpenGLFormat     := tfLuminance8ub1;
  fPrecision        := glBitmapRec4ub(8, 8, 8, 0);
  fShift            := glBitmapRec4ub(0, 0, 0, 0);
  fglFormat         := GL_LUMINANCE;
  fglInternalFormat := {$IFNDEF OPENGL_ES}GL_LUMINANCE8{$ELSE}GL_LUMINANCE{$ENDIF};
  fglDataFormat     := GL_UNSIGNED_BYTE;
end;

procedure TfdLuminance16us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfLuminance16us1;
  fWithAlpha        := tfLuminance16Alpha16us2;
  fWithoutAlpha     := tfLuminance16us1;
  fPrecision        := glBitmapRec4ub(16, 16, 16,  0);
  fShift            := glBitmapRec4ub( 0,  0,  0,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfLuminance16us1;
  fglFormat         := GL_LUMINANCE;
  fglInternalFormat := GL_LUMINANCE16;
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$ELSE}
  fOpenGLFormat     := tfLuminance8ub1;
{$ENDIF}
end;

procedure TfdLuminance4Alpha4ub2.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfLuminance4Alpha4ub2;
  fWithAlpha        := tfLuminance4Alpha4ub2;
  fWithoutAlpha     := tfLuminance4ub1;
  fPrecision        := glBitmapRec4ub(8, 8, 8, 8);
  fShift            := glBitmapRec4ub(0, 0, 0, 8);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfLuminance4Alpha4ub2;
  fglFormat         := GL_LUMINANCE_ALPHA;
  fglInternalFormat := GL_LUMINANCE4_ALPHA4;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := tfLuminance8Alpha8ub2;
{$ENDIF}
end;

procedure TfdLuminance6Alpha2ub2.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfLuminance6Alpha2ub2;
  fWithAlpha        := tfLuminance6Alpha2ub2;
  fWithoutAlpha     := tfLuminance8ub1;
  fPrecision        := glBitmapRec4ub(8, 8, 8, 8);
  fShift            := glBitmapRec4ub(0, 0, 0, 8);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfLuminance6Alpha2ub2;
  fglFormat         := GL_LUMINANCE_ALPHA;
  fglInternalFormat := GL_LUMINANCE6_ALPHA2;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := tfLuminance8Alpha8ub2;
{$ENDIF}
end;

procedure TfdLuminance8Alpha8ub2.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfLuminance8Alpha8ub2;
  fWithAlpha        := tfLuminance8Alpha8ub2;
  fWithoutAlpha     := tfLuminance8ub1;
  fOpenGLFormat     := tfLuminance8Alpha8ub2;
  fPrecision        := glBitmapRec4ub(8, 8, 8, 8);
  fShift            := glBitmapRec4ub(0, 0, 0, 8);
  fglFormat         := GL_LUMINANCE_ALPHA;
  fglInternalFormat := {$IFNDEF OPENGL_ES}GL_LUMINANCE8_ALPHA8{$ELSE}GL_LUMINANCE_ALPHA{$ENDIF};
  fglDataFormat     := GL_UNSIGNED_BYTE;
end;

procedure TfdLuminance12Alpha4us2.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfLuminance12Alpha4us2;
  fWithAlpha        := tfLuminance12Alpha4us2;
  fWithoutAlpha     := tfLuminance16us1;
  fPrecision        := glBitmapRec4ub(16, 16, 16, 16);
  fShift            := glBitmapRec4ub( 0,  0,  0, 16);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfLuminance12Alpha4us2;
  fglFormat         := GL_LUMINANCE_ALPHA;
  fglInternalFormat := GL_LUMINANCE12_ALPHA4;
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$ELSE}
  fOpenGLFormat     := tfLuminance8Alpha8ub2;
{$ENDIF}
end;

procedure TfdLuminance16Alpha16us2.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfLuminance16Alpha16us2;
  fWithAlpha        := tfLuminance16Alpha16us2;
  fWithoutAlpha     := tfLuminance16us1;
  fPrecision        := glBitmapRec4ub(16, 16, 16, 16);
  fShift            := glBitmapRec4ub( 0,  0,  0, 16);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfLuminance16Alpha16us2;
  fglFormat         := GL_LUMINANCE_ALPHA;
  fglInternalFormat := GL_LUMINANCE16_ALPHA16;
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$ELSE}
  fOpenGLFormat     := tfLuminance8Alpha8ub2;
{$ENDIF}
end;

procedure TfdR3G3B2ub1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 8;
  fFormat           := tfR3G3B2ub1;
  fWithAlpha        := tfRGBA4us1;
  fWithoutAlpha     := tfR3G3B2ub1;
  fRGBInverted      := tfEmpty;
  fPrecision        := glBitmapRec4ub(3, 3, 2, 0);
  fShift            := glBitmapRec4ub(5, 2, 0, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfR3G3B2ub1;
  fglFormat         := GL_RGB;
  fglInternalFormat := GL_R3_G3_B2;
  fglDataFormat     := GL_UNSIGNED_BYTE_3_3_2;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdRGBX4us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfRGBX4us1;
  fWithAlpha        := tfRGBA4us1;
  fWithoutAlpha     := tfRGBX4us1;
  fRGBInverted      := tfBGRX4us1;
  fPrecision        := glBitmapRec4ub( 4, 4, 4, 0);
  fShift            := glBitmapRec4ub(12, 8, 4, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfRGBX4us1;
  fglFormat         := GL_RGBA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB4;
  fglDataFormat     := GL_UNSIGNED_SHORT_4_4_4_4;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdXRGB4us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfXRGB4us1;
  fWithAlpha        := tfARGB4us1;
  fWithoutAlpha     := tfXRGB4us1;
  fRGBInverted      := tfXBGR4us1;
  fPrecision        := glBitmapRec4ub(4, 4, 4, 0);
  fShift            := glBitmapRec4ub(8, 4, 0, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfXRGB4us1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGB4;
  fglDataFormat     := GL_UNSIGNED_SHORT_4_4_4_4_REV;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdR5G6B5us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfR5G6B5us1;
  fWithAlpha        := tfRGB5A1us1;
  fWithoutAlpha     := tfR5G6B5us1;
  fRGBInverted      := tfB5G6R5us1;
  fPrecision        := glBitmapRec4ub( 5, 6, 5, 0);
  fShift            := glBitmapRec4ub(11, 5, 0, 0);
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_2_0)}
  fOpenGLFormat     := tfR5G6B5us1;
  fglFormat         := GL_RGB;
  fglInternalFormat := GL_RGB565;
  fglDataFormat     := GL_UNSIGNED_SHORT_5_6_5;
{$ELSE}
  fOpenGLFormat     := tfRGB8ub3;
{$IFEND}
end;

procedure TfdRGB5X1us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfRGB5X1us1;
  fWithAlpha        := tfRGB5A1us1;
  fWithoutAlpha     := tfRGB5X1us1;
  fRGBInverted      := tfBGR5X1us1;
  fPrecision        := glBitmapRec4ub( 5, 5, 5, 0);
  fShift            := glBitmapRec4ub(11, 6, 1, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfRGB5X1us1;
  fglFormat         := GL_RGBA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB5;
  fglDataFormat     := GL_UNSIGNED_SHORT_5_5_5_1;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdX1RGB5us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfX1RGB5us1;
  fWithAlpha        := tfA1RGB5us1;
  fWithoutAlpha     := tfX1RGB5us1;
  fRGBInverted      := tfX1BGR5us1;
  fPrecision        := glBitmapRec4ub( 5, 5, 5, 0);
  fShift            := glBitmapRec4ub(10, 5, 0, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfX1RGB5us1;
  fglFormat         := GL_BGRA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB5;
  fglDataFormat     := GL_UNSIGNED_SHORT_1_5_5_5_REV;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdRGB8ub3.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 24;
  fFormat           := tfRGB8ub3;
  fWithAlpha        := tfRGBA8ub4;
  fWithoutAlpha     := tfRGB8ub3;
  fRGBInverted      := tfBGR8ub3;
  fPrecision        := glBitmapRec4ub(8, 8,  8, 0);
  fShift            := glBitmapRec4ub(0, 8, 16, 0);
  fOpenGLFormat     := tfRGB8ub3;
  fglFormat         := GL_RGB;
  fglInternalFormat := {$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}GL_RGB8{$ELSE}GL_RGB{$IFEND};
  fglDataFormat     := GL_UNSIGNED_BYTE;
end;

procedure TfdRGBX8ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfRGBX8ui1;
  fWithAlpha        := tfRGBA8ui1;
  fWithoutAlpha     := tfRGBX8ui1;
  fRGBInverted      := tfBGRX8ui1;
  fPrecision        := glBitmapRec4ub( 8,  8,  8, 0);
  fShift            := glBitmapRec4ub(24, 16,  8, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfRGBX8ui1;
  fglFormat         := GL_RGBA;  //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB8;
  fglDataFormat     := GL_UNSIGNED_INT_8_8_8_8;
{$ELSE}
  fOpenGLFormat     := tfRGB8ub3;
{$ENDIF}
end;

procedure TfdXRGB8ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfXRGB8ui1;
  fWithAlpha        := tfXRGB8ui1;
  fWithoutAlpha     := tfXRGB8ui1;
  fOpenGLFormat     := tfXRGB8ui1;
  fRGBInverted      := tfXBGR8ui1;
  fPrecision        := glBitmapRec4ub( 8,  8,  8, 0);
  fShift            := glBitmapRec4ub(16,  8,  0, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfXRGB8ui1;
  fglFormat         := GL_BGRA;  //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB8;
  fglDataFormat     := GL_UNSIGNED_INT_8_8_8_8_REV;
{$ELSE}
  fOpenGLFormat     := tfRGB8ub3;
{$ENDIF}
end;

procedure TfdRGB10X2ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfRGB10X2ui1;
  fWithAlpha        := tfRGB10A2ui1;
  fWithoutAlpha     := tfRGB10X2ui1;
  fRGBInverted      := tfBGR10X2ui1;
  fPrecision        := glBitmapRec4ub(10, 10, 10, 0);
  fShift            := glBitmapRec4ub(22, 12,  2, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfRGB10X2ui1;
  fglFormat         := GL_RGBA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB10;
  fglDataFormat     := GL_UNSIGNED_INT_10_10_10_2;
{$ELSE}
  fOpenGLFormat     := tfRGB16us3;
{$ENDIF}
end;

procedure TfdX2RGB10ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfX2RGB10ui1;
  fWithAlpha        := tfA2RGB10ui1;
  fWithoutAlpha     := tfX2RGB10ui1;
  fRGBInverted      := tfX2BGR10ui1;
  fPrecision        := glBitmapRec4ub(10, 10, 10, 0);
  fShift            := glBitmapRec4ub(20, 10,  0, 0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfX2RGB10ui1;
  fglFormat         := GL_BGRA;  //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB10;
  fglDataFormat     := GL_UNSIGNED_INT_2_10_10_10_REV;
{$ELSE}
  fOpenGLFormat     := tfRGB16us3;
{$ENDIF}
end;

procedure TfdRGB16us3.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 48;
  fFormat           := tfRGB16us3;
  fWithAlpha        := tfRGBA16us4;
  fWithoutAlpha     := tfRGB16us3;
  fRGBInverted      := tfBGR16us3;
  fPrecision        := glBitmapRec4ub(16, 16, 16, 0);
  fShift            := glBitmapRec4ub( 0, 16, 32, 0);
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
  fOpenGLFormat     := tfRGB16us3;
  fglFormat         := GL_RGB;
  fglInternalFormat := {$IFNDEF OPENGL_ES}GL_RGB16{$ELSE}GL_RGB16UI{$ENDIF};
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$ELSE}
  fOpenGLFormat     := tfRGB8ub3;
{$IFEND}
end;

procedure TfdRGBA4us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfRGBA4us1;
  fWithAlpha        := tfRGBA4us1;
  fWithoutAlpha     := tfRGBX4us1;
  fOpenGLFormat     := tfRGBA4us1;
  fRGBInverted      := tfBGRA4us1;
  fPrecision        := glBitmapRec4ub( 4,  4,  4,  4);
  fShift            := glBitmapRec4ub(12,  8,  4,  0);
  fglFormat         := GL_RGBA;
  fglInternalFormat := {$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}GL_RGBA8{$ELSE}GL_RGBA{$IFEND};
  fglDataFormat     := GL_UNSIGNED_SHORT_4_4_4_4;
end;

procedure TfdARGB4us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfARGB4us1;
  fWithAlpha        := tfARGB4us1;
  fWithoutAlpha     := tfXRGB4us1;
  fRGBInverted      := tfABGR4us1;
  fPrecision        := glBitmapRec4ub( 4,  4,  4,  4);
  fShift            := glBitmapRec4ub( 8,  4,  0, 12);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfARGB4us1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGBA4;
  fglDataFormat     := GL_UNSIGNED_SHORT_4_4_4_4_REV;
{$ELSE}
  fOpenGLFormat     := tfRGBA4us1;
{$ENDIF}
end;

procedure TfdRGB5A1us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfRGB5A1us1;
  fWithAlpha        := tfRGB5A1us1;
  fWithoutAlpha     := tfRGB5X1us1;
  fOpenGLFormat     := tfRGB5A1us1;
  fRGBInverted      := tfBGR5A1us1;
  fPrecision        := glBitmapRec4ub( 5,  5,  5,  1);
  fShift            := glBitmapRec4ub(11,  6,  1,  0);
  fglFormat         := GL_RGBA;
  fglInternalFormat := {$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_2_0)}GL_RGB5_A1{$ELSE}GL_RGBA{$IFEND};
  fglDataFormat     := GL_UNSIGNED_SHORT_5_5_5_1;
end;

procedure TfdA1RGB5us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfA1RGB5us1;
  fWithAlpha        := tfA1RGB5us1;
  fWithoutAlpha     := tfX1RGB5us1;
  fRGBInverted      := tfA1BGR5us1;
  fPrecision        := glBitmapRec4ub( 5,  5,  5,  1);
  fShift            := glBitmapRec4ub(10,  5,  0, 15);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfA1RGB5us1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGB5_A1;
  fglDataFormat     := GL_UNSIGNED_SHORT_1_5_5_5_REV;
{$ELSE}
  fOpenGLFormat     := tfRGB5A1us1;
{$ENDIF}
end;

procedure TfdRGBA8ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfRGBA8ui1;
  fWithAlpha        := tfRGBA8ui1;
  fWithoutAlpha     := tfRGBX8ui1;
  fRGBInverted      := tfBGRA8ui1;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  8);
  fShift            := glBitmapRec4ub(24, 16,  8,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfRGBA8ui1;
  fglFormat         := GL_RGBA;
  fglInternalFormat := GL_RGBA8;
  fglDataFormat     := GL_UNSIGNED_INT_8_8_8_8;
{$ELSE}
  fOpenGLFormat     := tfRGBA8ub4;
{$ENDIF}
end;

procedure TfdARGB8ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfARGB8ui1;
  fWithAlpha        := tfARGB8ui1;
  fWithoutAlpha     := tfXRGB8ui1;
  fRGBInverted      := tfABGR8ui1;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  8);
  fShift            := glBitmapRec4ub(16,  8,  0, 24);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfARGB8ui1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGBA8;
  fglDataFormat     := GL_UNSIGNED_INT_8_8_8_8_REV;
{$ELSE}
  fOpenGLFormat     := tfRGBA8ub4;
{$ENDIF}
end;

procedure TfdRGBA8ub4.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfRGBA8ub4;
  fWithAlpha        := tfRGBA8ub4;
  fWithoutAlpha     := tfRGB8ub3;
  fOpenGLFormat     := tfRGBA8ub4;
  fRGBInverted      := tfBGRA8ub4;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  8);
  fShift            := glBitmapRec4ub( 0,  8, 16, 24);
  fglFormat         := GL_RGBA;
  fglInternalFormat := {$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}GL_RGBA8{$ELSE}GL_RGBA{$IFEND};
  fglDataFormat     := GL_UNSIGNED_BYTE;
end;

procedure TfdRGB10A2ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfRGB10A2ui1;
  fWithAlpha        := tfRGB10A2ui1;
  fWithoutAlpha     := tfRGB10X2ui1;
  fRGBInverted      := tfBGR10A2ui1;
  fPrecision        := glBitmapRec4ub(10, 10, 10,  2);
  fShift            := glBitmapRec4ub(22, 12,  2,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfRGB10A2ui1;
  fglFormat         := GL_RGBA;
  fglInternalFormat := GL_RGB10_A2;
  fglDataFormat     := GL_UNSIGNED_INT_10_10_10_2;
{$ELSE}
  fOpenGLFormat     := tfA2RGB10ui1;
{$ENDIF}
end;

procedure TfdA2RGB10ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfA2RGB10ui1;
  fWithAlpha        := tfA2RGB10ui1;
  fWithoutAlpha     := tfX2RGB10ui1;
  fRGBInverted      := tfA2BGR10ui1;
  fPrecision        := glBitmapRec4ub(10, 10, 10,  2);
  fShift            := glBitmapRec4ub(20, 10,  0, 30);
{$IF NOT DEFINED(OPENGL_ES)}
  fOpenGLFormat     := tfA2RGB10ui1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGB10_A2;
  fglDataFormat     := GL_UNSIGNED_INT_2_10_10_10_REV;
{$ELSEIF DEFINED(OPENGL_ES_3_0)}
  fOpenGLFormat     := tfA2RGB10ui1;
  fglFormat         := GL_RGBA;
  fglInternalFormat := GL_RGB10_A2;
  fglDataFormat     := GL_UNSIGNED_INT_2_10_10_10_REV;
{$ELSE}
  fOpenGLFormat     := tfRGBA8ui1;
{$IFEND}
end;

procedure TfdRGBA16us4.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 64;
  fFormat           := tfRGBA16us4;
  fWithAlpha        := tfRGBA16us4;
  fWithoutAlpha     := tfRGB16us3;
  fRGBInverted      := tfBGRA16us4;
  fPrecision        := glBitmapRec4ub(16, 16, 16, 16);
  fShift            := glBitmapRec4ub( 0, 16, 32, 48);
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
  fOpenGLFormat     := tfRGBA16us4;
  fglFormat         := GL_RGBA;
  fglInternalFormat := {$IFNDEF OPENGL_ES}GL_RGBA16{$ELSE}GL_RGBA16UI{$ENDIF};
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$ELSE}
  fOpenGLFormat     := tfRGBA8ub4;
{$IFEND}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdBGRX4us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfBGRX4us1;
  fWithAlpha        := tfBGRA4us1;
  fWithoutAlpha     := tfBGRX4us1;
  fRGBInverted      := tfRGBX4us1;
  fPrecision        := glBitmapRec4ub( 4,  4,  4,  0);
  fShift            := glBitmapRec4ub( 4,  8, 12,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGRX4us1;
  fglFormat         := GL_BGRA;  //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB4;
  fglDataFormat     := GL_UNSIGNED_SHORT_4_4_4_4;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdXBGR4us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfXBGR4us1;
  fWithAlpha        := tfABGR4us1;
  fWithoutAlpha     := tfXBGR4us1;
  fRGBInverted      := tfXRGB4us1;
  fPrecision        := glBitmapRec4ub( 4,  4,  4,  0);
  fShift            := glBitmapRec4ub( 0,  4,  8,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfXBGR4us1;
  fglFormat         := GL_RGBA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB4;
  fglDataFormat     := GL_UNSIGNED_SHORT_4_4_4_4_REV;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdB5G6R5us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfB5G6R5us1;
  fWithAlpha        := tfBGR5A1us1;
  fWithoutAlpha     := tfB5G6R5us1;
  fRGBInverted      := tfR5G6B5us1;
  fPrecision        := glBitmapRec4ub( 5,  6,  5,  0);
  fShift            := glBitmapRec4ub( 0,  5, 11,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfB5G6R5us1;
  fglFormat         := GL_RGB;
  fglInternalFormat := GL_RGB565;
  fglDataFormat     := GL_UNSIGNED_SHORT_5_6_5_REV;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdBGR5X1us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfBGR5X1us1;
  fWithAlpha        := tfBGR5A1us1;
  fWithoutAlpha     := tfBGR5X1us1;
  fRGBInverted      := tfRGB5X1us1;
  fPrecision        := glBitmapRec4ub( 5,  5,  5,  0);
  fShift            := glBitmapRec4ub( 1,  6, 11,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGR5X1us1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGB5;
  fglDataFormat     := GL_UNSIGNED_SHORT_5_5_5_1;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdX1BGR5us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfX1BGR5us1;
  fWithAlpha        := tfA1BGR5us1;
  fWithoutAlpha     := tfX1BGR5us1;
  fRGBInverted      := tfX1RGB5us1;
  fPrecision        := glBitmapRec4ub( 5,  5,  5,  0);
  fShift            := glBitmapRec4ub( 0,  5, 10,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfX1BGR5us1;
  fglFormat         := GL_RGBA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB5;
  fglDataFormat     := GL_UNSIGNED_SHORT_1_5_5_5_REV;
{$ELSE}
  fOpenGLFormat     := tfR5G6B5us1;
{$ENDIF}
end;

procedure TfdBGR8ub3.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 24;
  fFormat           := tfBGR8ub3;
  fWithAlpha        := tfBGRA8ub4;
  fWithoutAlpha     := tfBGR8ub3;
  fRGBInverted      := tfRGB8ub3;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  0);
  fShift            := glBitmapRec4ub(16,  8,  0,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGR8ub3;
  fglFormat         := GL_BGR;
  fglInternalFormat := GL_RGB8;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := tfRGB8ub3;
{$ENDIF}
end;

procedure TfdBGRX8ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfBGRX8ui1;
  fWithAlpha        := tfBGRA8ui1;
  fWithoutAlpha     := tfBGRX8ui1;
  fRGBInverted      := tfRGBX8ui1;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  0);
  fShift            := glBitmapRec4ub( 8, 16, 24,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGRX8ui1;
  fglFormat         := GL_BGRA;  //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB8;
  fglDataFormat     := GL_UNSIGNED_INT_8_8_8_8;
{$ELSE}
  fOpenGLFormat     := tfRGB8ub3;
{$ENDIF}
end;

procedure TfdXBGR8ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfXBGR8ui1;
  fWithAlpha        := tfABGR8ui1;
  fWithoutAlpha     := tfXBGR8ui1;
  fRGBInverted      := tfXRGB8ui1;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  0);
  fShift            := glBitmapRec4ub( 0,  8, 16,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfXBGR8ui1;
  fglFormat         := GL_RGBA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB8;
  fglDataFormat     := GL_UNSIGNED_INT_8_8_8_8_REV;
{$ELSE}
  fOpenGLFormat     := tfRGB8ub3;
{$ENDIF}
end;

procedure TfdBGR10X2ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfBGR10X2ui1;
  fWithAlpha        := tfBGR10A2ui1;
  fWithoutAlpha     := tfBGR10X2ui1;
  fRGBInverted      := tfRGB10X2ui1;
  fPrecision        := glBitmapRec4ub(10, 10, 10,  0);
  fShift            := glBitmapRec4ub( 2, 12, 22,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGR10X2ui1;
  fglFormat         := GL_BGRA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB10;
  fglDataFormat     := GL_UNSIGNED_INT_10_10_10_2;
{$ELSE}
  fOpenGLFormat     := tfRGB16us3;
{$ENDIF}
end;

procedure TfdX2BGR10ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfX2BGR10ui1;
  fWithAlpha        := tfA2BGR10ui1;
  fWithoutAlpha     := tfX2BGR10ui1;
  fRGBInverted      := tfX2RGB10ui1;
  fPrecision        := glBitmapRec4ub(10, 10, 10,  0);
  fShift            := glBitmapRec4ub( 0, 10, 20,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfX2BGR10ui1;
  fglFormat         := GL_RGBA; //GL_INVALID_OPERATION if not GL_BGRA or GL_RGBA
  fglInternalFormat := GL_RGB10;
  fglDataFormat     := GL_UNSIGNED_INT_2_10_10_10_REV;
{$ELSE}
  fOpenGLFormat     := tfRGB16us3;
{$ENDIF}
end;

procedure TfdBGR16us3.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 48;
  fFormat           := tfBGR16us3;
  fWithAlpha        := tfBGRA16us4;
  fWithoutAlpha     := tfBGR16us3;
  fRGBInverted      := tfRGB16us3;
  fPrecision        := glBitmapRec4ub(16, 16, 16,  0);
  fShift            := glBitmapRec4ub(32, 16,  0,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGR16us3;
  fglFormat         := GL_BGR;
  fglInternalFormat := GL_RGB16;
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$ELSE}
  fOpenGLFormat     := tfRGB16us3;
{$ENDIF}
end;

procedure TfdBGRA4us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfBGRA4us1;
  fWithAlpha        := tfBGRA4us1;
  fWithoutAlpha     := tfBGRX4us1;
  fRGBInverted      := tfRGBA4us1;
  fPrecision        := glBitmapRec4ub( 4,  4,  4,  4);
  fShift            := glBitmapRec4ub( 4,  8, 12,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGRA4us1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGBA4;
  fglDataFormat     := GL_UNSIGNED_SHORT_4_4_4_4;
{$ELSE}
  fOpenGLFormat     := tfRGBA4us1;
{$ENDIF}
end;

procedure TfdABGR4us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfABGR4us1;
  fWithAlpha        := tfABGR4us1;
  fWithoutAlpha     := tfXBGR4us1;
  fRGBInverted      := tfARGB4us1;
  fPrecision        := glBitmapRec4ub( 4,  4,  4,  4);
  fShift            := glBitmapRec4ub( 0,  4,  8, 12);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfABGR4us1;
  fglFormat         := GL_RGBA;
  fglInternalFormat := GL_RGBA4;
  fglDataFormat     := GL_UNSIGNED_SHORT_4_4_4_4_REV;
{$ELSE}
  fOpenGLFormat     := tfRGBA4us1;
{$ENDIF}
end;

procedure TfdBGR5A1us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfBGR5A1us1;
  fWithAlpha        := tfBGR5A1us1;
  fWithoutAlpha     := tfBGR5X1us1;
  fRGBInverted      := tfRGB5A1us1;
  fPrecision        := glBitmapRec4ub( 5,  5,  5,  1);
  fShift            := glBitmapRec4ub( 1,  6, 11,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGR5A1us1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGB5_A1;
  fglDataFormat     := GL_UNSIGNED_SHORT_5_5_5_1;
{$ELSE}
  fOpenGLFormat     := tfRGB5A1us1;
{$ENDIF}
end;

procedure TfdA1BGR5us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfA1BGR5us1;
  fWithAlpha        := tfA1BGR5us1;
  fWithoutAlpha     := tfX1BGR5us1;
  fRGBInverted      := tfA1RGB5us1;
  fPrecision        := glBitmapRec4ub( 5,  5,  5,  1);
  fShift            := glBitmapRec4ub( 0,  5, 10, 15);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfA1BGR5us1;
  fglFormat         := GL_RGBA;
  fglInternalFormat := GL_RGB5_A1;
  fglDataFormat     := GL_UNSIGNED_SHORT_1_5_5_5_REV;
{$ELSE}
  fOpenGLFormat     := tfRGB5A1us1;
{$ENDIF}
end;

procedure TfdBGRA8ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfBGRA8ui1;
  fWithAlpha        := tfBGRA8ui1;
  fWithoutAlpha     := tfBGRX8ui1;
  fRGBInverted      := tfRGBA8ui1;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  8);
  fShift            := glBitmapRec4ub( 8, 16, 24,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGRA8ui1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGBA8;
  fglDataFormat     := GL_UNSIGNED_INT_8_8_8_8;
{$ELSE}
  fOpenGLFormat     := tfRGBA8ub4;
{$ENDIF}
end;

procedure TfdABGR8ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfABGR8ui1;
  fWithAlpha        := tfABGR8ui1;
  fWithoutAlpha     := tfXBGR8ui1;
  fRGBInverted      := tfARGB8ui1;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  8);
  fShift            := glBitmapRec4ub( 0,  8, 16, 24);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfABGR8ui1;
  fglFormat         := GL_RGBA;
  fglInternalFormat := GL_RGBA8;
  fglDataFormat     := GL_UNSIGNED_INT_8_8_8_8_REV;
{$ELSE}
  fOpenGLFormat     := tfRGBA8ub4
{$ENDIF}
end;

procedure TfdBGRA8ub4.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfBGRA8ub4;
  fWithAlpha        := tfBGRA8ub4;
  fWithoutAlpha     := tfBGR8ub3;
  fRGBInverted      := tfRGBA8ub4;
  fPrecision        := glBitmapRec4ub( 8,  8,  8,  8);
  fShift            := glBitmapRec4ub(16,  8,  0, 24);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGRA8ub4;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGBA8;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := tfRGBA8ub4;
{$ENDIF}
end;

procedure TfdBGR10A2ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfBGR10A2ui1;
  fWithAlpha        := tfBGR10A2ui1;
  fWithoutAlpha     := tfBGR10X2ui1;
  fRGBInverted      := tfRGB10A2ui1;
  fPrecision        := glBitmapRec4ub(10, 10, 10,  2);
  fShift            := glBitmapRec4ub( 2, 12, 22,  0);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGR10A2ui1;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGB10_A2;
  fglDataFormat     := GL_UNSIGNED_INT_10_10_10_2;
{$ELSE}
  fOpenGLFormat     := tfA2RGB10ui1;
{$ENDIF}
end;

procedure TfdA2BGR10ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfA2BGR10ui1;
  fWithAlpha        := tfA2BGR10ui1;
  fWithoutAlpha     := tfX2BGR10ui1;
  fRGBInverted      := tfA2RGB10ui1;
  fPrecision        := glBitmapRec4ub(10, 10, 10,  2);
  fShift            := glBitmapRec4ub( 0, 10, 20, 30);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfA2BGR10ui1;
  fglFormat         := GL_RGBA;
  fglInternalFormat := GL_RGB10_A2;
  fglDataFormat     := GL_UNSIGNED_INT_2_10_10_10_REV;
{$ELSE}
  fOpenGLFormat     := tfA2RGB10ui1;
{$ENDIF}
end;

procedure TfdBGRA16us4.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 64;
  fFormat           := tfBGRA16us4;
  fWithAlpha        := tfBGRA16us4;
  fWithoutAlpha     := tfBGR16us3;
  fRGBInverted      := tfRGBA16us4;
  fPrecision        := glBitmapRec4ub(16, 16, 16, 16);
  fShift            := glBitmapRec4ub(32, 16,  0, 48);
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfBGRA16us4;
  fglFormat         := GL_BGRA;
  fglInternalFormat := GL_RGBA16;
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$ELSE}
  fOpenGLFormat     := tfRGBA16us4;
{$ENDIF}
end;

procedure TfdDepth16us1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 16;
  fFormat           := tfDepth16us1;
  fWithoutAlpha     := tfDepth16us1;
  fPrecision        := glBitmapRec4ub(16, 16, 16, 16);
  fShift            := glBitmapRec4ub( 0,  0,  0,  0);
{$IF NOT DEFINED (OPENGL_ES) OR DEFINED(OPENGL_ES_2_0)}
  fOpenGLFormat     := tfDepth16us1;
  fglFormat         := GL_DEPTH_COMPONENT;
  fglInternalFormat := GL_DEPTH_COMPONENT16;
  fglDataFormat     := GL_UNSIGNED_SHORT;
{$IFEND}
end;

procedure TfdDepth24ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfDepth24ui1;
  fWithoutAlpha     := tfDepth24ui1;
  fOpenGLFormat     := tfDepth24ui1;
  fPrecision        := glBitmapRec4ub(32, 32, 32, 32);
  fShift            := glBitmapRec4ub( 0,  0,  0,  0);
{$IF NOT DEFINED (OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
  fOpenGLFormat     := tfDepth24ui1;
  fglFormat         := GL_DEPTH_COMPONENT;
  fglInternalFormat := GL_DEPTH_COMPONENT24;
  fglDataFormat     := GL_UNSIGNED_INT;
{$IFEND}
end;

procedure TfdDepth32ui1.SetValues;
begin
  inherited SetValues;
  fBitsPerPixel     := 32;
  fFormat           := tfDepth32ui1;
  fWithoutAlpha     := tfDepth32ui1;
  fPrecision        := glBitmapRec4ub(32, 32, 32, 32);
  fShift            := glBitmapRec4ub( 0,  0,  0,  0);
{$IF NOT DEFINED(OPENGL_ES)}
  fOpenGLFormat     := tfDepth32ui1;
  fglFormat         := GL_DEPTH_COMPONENT;
  fglInternalFormat := GL_DEPTH_COMPONENT32;
  fglDataFormat     := GL_UNSIGNED_INT;
{$ELSEIF DEFINED(OPENGL_ES_3_0)}
  fOpenGLFormat     := tfDepth24ui1;
{$ELSEIF DEFINED(OPENGL_ES_2_0)}
  fOpenGLFormat     := tfDepth16us1;
{$IFEND}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdS3tcDtx1RGBA/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdS3tcDtx1RGBA.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  raise EglBitmap.Create('mapping for compressed formats is not supported');
end;

procedure TfdS3tcDtx1RGBA.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  raise EglBitmap.Create('mapping for compressed formats is not supported');
end;

procedure TfdS3tcDtx1RGBA.SetValues;
begin
  inherited SetValues;
  fFormat           := tfS3tcDtx1RGBA;
  fWithAlpha        := tfS3tcDtx1RGBA;
  fUncompressed     := tfRGB5A1us1;
  fBitsPerPixel     := 4;
  fIsCompressed     := true;
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfS3tcDtx1RGBA;
  fglFormat         := GL_COMPRESSED_RGBA;
  fglInternalFormat := GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := fUncompressed;
{$ENDIF}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdS3tcDtx3RGBA/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdS3tcDtx3RGBA.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  raise EglBitmap.Create('mapping for compressed formats is not supported');
end;

procedure TfdS3tcDtx3RGBA.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  raise EglBitmap.Create('mapping for compressed formats is not supported');
end;

procedure TfdS3tcDtx3RGBA.SetValues;
begin
  inherited SetValues;
  fFormat           := tfS3tcDtx3RGBA;
  fWithAlpha        := tfS3tcDtx3RGBA;
  fUncompressed     := tfRGBA8ub4;
  fBitsPerPixel     := 8;
  fIsCompressed     := true;
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfS3tcDtx3RGBA;
  fglFormat         := GL_COMPRESSED_RGBA;
  fglInternalFormat := GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := fUncompressed;
{$ENDIF}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TfdS3tcDtx5RGBA/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TfdS3tcDtx5RGBA.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  raise EglBitmap.Create('mapping for compressed formats is not supported');
end;

procedure TfdS3tcDtx5RGBA.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
begin
  raise EglBitmap.Create('mapping for compressed formats is not supported');
end;

procedure TfdS3tcDtx5RGBA.SetValues;
begin
  inherited SetValues;
  fFormat           := tfS3tcDtx3RGBA;
  fWithAlpha        := tfS3tcDtx3RGBA;
  fUncompressed     := tfRGBA8ub4;
  fBitsPerPixel     := 8;
  fIsCompressed     := true;
{$IFNDEF OPENGL_ES}
  fOpenGLFormat     := tfS3tcDtx3RGBA;
  fglFormat         := GL_COMPRESSED_RGBA;
  fglInternalFormat := GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
  fglDataFormat     := GL_UNSIGNED_BYTE;
{$ELSE}
  fOpenGLFormat     := fUncompressed;
{$ENDIF}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmapFormatDescriptor///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapFormatDescriptor.GetHasRed: Boolean;
begin
  result := (fPrecision.r > 0);
end;

function TglBitmapFormatDescriptor.GetHasGreen: Boolean;
begin
  result := (fPrecision.g > 0);
end;

function TglBitmapFormatDescriptor.GetHasBlue: Boolean;
begin
  result := (fPrecision.b > 0);
end;

function TglBitmapFormatDescriptor.GetHasAlpha: Boolean;
begin
  result := (fPrecision.a > 0);
end;

function TglBitmapFormatDescriptor.GetHasColor: Boolean;
begin
  result := HasRed or HasGreen or HasBlue;
end;

function TglBitmapFormatDescriptor.GetIsGrayscale: Boolean;
begin
  result := (Mask.r = Mask.g) and (Mask.g = Mask.b) and (Mask.r > 0);
end;

procedure TglBitmapFormatDescriptor.SetValues;
begin
  fFormat       := tfEmpty;
  fWithAlpha    := tfEmpty;
  fWithoutAlpha := tfEmpty;
  fOpenGLFormat := tfEmpty;
  fRGBInverted  := tfEmpty;
  fUncompressed := tfEmpty;

  fBitsPerPixel := 0;
  fIsCompressed := false;

  fglFormat         := 0;
  fglInternalFormat := 0;
  fglDataFormat     := 0;

  FillChar(fPrecision, 0, SizeOf(fPrecision));
  FillChar(fShift,     0, SizeOf(fShift));
end;

procedure TglBitmapFormatDescriptor.CalcValues;
var
  i: Integer;
begin
  fBytesPerPixel := fBitsPerPixel / 8;
  fChannelCount  := 0;
  for i := 0 to 3 do begin
    if (fPrecision.arr[i] > 0) then
      inc(fChannelCount);
    fRange.arr[i] := (1 shl fPrecision.arr[i]) - 1;
    fMask.arr[i]  := fRange.arr[i] shl fShift.arr[i];
  end;
end;

function TglBitmapFormatDescriptor.GetSize(const aSize: TglBitmapSize): Integer;
var
  w, h: Integer;
begin
  if (ffX in aSize.Fields) or (ffY in aSize.Fields) then begin
    w := Max(1, aSize.X);
    h := Max(1, aSize.Y);
    result := GetSize(w, h);
  end else
    result := 0;
end;

function TglBitmapFormatDescriptor.GetSize(const aWidth, aHeight: Integer): Integer;
begin
  result := 0;
  if (aWidth <= 0) or (aHeight <= 0) then
    exit;
  result := Ceil(aWidth * aHeight * BytesPerPixel);
end;

constructor TglBitmapFormatDescriptor.Create;
begin
  inherited Create;
  SetValues;
  CalcValues;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class function TglBitmapFormatDescriptor.GetByFormat(const aInternalFormat: GLenum): TglBitmapFormatDescriptor;
var
  f: TglBitmapFormat;
begin
  for f := Low(TglBitmapFormat) to High(TglBitmapFormat) do begin
    result := TFormatDescriptor.Get(f);
    if (result.glInternalFormat = aInternalFormat) then
      exit;
  end;
  result := TFormatDescriptor.Get(tfEmpty);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TFormatDescriptor///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class procedure TFormatDescriptor.Init;
begin
  if not Assigned(FormatDescriptorCS) then
    FormatDescriptorCS := TCriticalSection.Create;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class function TFormatDescriptor.Get(const aFormat: TglBitmapFormat): TFormatDescriptor;
begin
  FormatDescriptorCS.Enter;
  try
    result := FormatDescriptors[aFormat];
    if not Assigned(result) then begin
      result := FORMAT_DESCRIPTOR_CLASSES[aFormat].Create;
      FormatDescriptors[aFormat] := result;
    end;
  finally
    FormatDescriptorCS.Leave;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class function TFormatDescriptor.GetAlpha(const aFormat: TglBitmapFormat): TFormatDescriptor;
begin
  result := Get(Get(aFormat).WithAlpha);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class function TFormatDescriptor.GetFromMask(const aMask: TglBitmapRec4ul; const aBitCount: Integer): TFormatDescriptor;
var
  ft: TglBitmapFormat;
begin
  // find matching format with OpenGL support
  for ft := High(TglBitmapFormat) downto Low(TglBitmapFormat) do begin
    result := Get(ft);
    if (result.MaskMatch(aMask))      and
       (result.glFormat <> 0)         and
       (result.glInternalFormat <> 0) and
       ((aBitCount = 0) or (aBitCount = result.BitsPerPixel))
    then
      exit;
  end;

  // find matching format without OpenGL Support
  for ft := High(TglBitmapFormat) downto Low(TglBitmapFormat) do begin
    result := Get(ft);
    if result.MaskMatch(aMask) and ((aBitCount = 0) or (aBitCount = result.BitsPerPixel)) then
      exit;
  end;

  result := TFormatDescriptor.Get(tfEmpty);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class function TFormatDescriptor.GetFromPrecShift(const aPrec, aShift: TglBitmapRec4ub; const aBitCount: Integer): TFormatDescriptor;
var
  ft: TglBitmapFormat;
begin
  // find matching format with OpenGL support
  for ft := High(TglBitmapFormat) downto Low(TglBitmapFormat) do begin
    result := Get(ft);
    if glBitmapRec4ubCompare(result.Shift,     aShift) and
       glBitmapRec4ubCompare(result.Precision, aPrec) and
       (result.glFormat <> 0)         and
       (result.glInternalFormat <> 0) and
       ((aBitCount = 0) or (aBitCount = result.BitsPerPixel))
    then
      exit;
  end;

  // find matching format without OpenGL Support
  for ft := High(TglBitmapFormat) downto Low(TglBitmapFormat) do begin
    result := Get(ft);
    if glBitmapRec4ubCompare(result.Shift,     aShift) and
       glBitmapRec4ubCompare(result.Precision, aPrec)  and
       ((aBitCount = 0) or (aBitCount = result.BitsPerPixel)) then
      exit;
  end;

  result := TFormatDescriptor.Get(tfEmpty);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class procedure TFormatDescriptor.Clear;
var
  f: TglBitmapFormat;
begin
  FormatDescriptorCS.Enter;
  try
    for f := low(FormatDescriptors) to high(FormatDescriptors) do
      FreeAndNil(FormatDescriptors[f]);
  finally
    FormatDescriptorCS.Leave;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class procedure TFormatDescriptor.Finalize;
begin
  Clear;
  FreeAndNil(FormatDescriptorCS);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TBitfieldFormat/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpBitfieldFormat.SetCustomValues(const aBPP: Integer; aMask: TglBitmapRec4ul);
var
  i: Integer;
begin
  for i := 0 to 3 do begin
    fShift.arr[i] := 0;
    while (aMask.arr[i] > 0) and ((aMask.arr[i] and 1) = 0) do begin
      aMask.arr[i] := aMask.arr[i] shr 1;
      inc(fShift.arr[i]);
    end;
    fPrecision.arr[i] := CountSetBits(aMask.arr[i]);
  end;
  fBitsPerPixel := aBPP;
  CalcValues;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpBitfieldFormat.SetCustomValues(const aBBP: Integer; const aPrec, aShift: TglBitmapRec4ub);
begin
  fBitsPerPixel := aBBP;
  fPrecision    := aPrec;
  fShift        := aShift;
  CalcValues;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpBitfieldFormat.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
var
  data: QWord;
begin
  data :=
    ((aPixel.Data.r and Range.r) shl Shift.r) or
    ((aPixel.Data.g and Range.g) shl Shift.g) or
    ((aPixel.Data.b and Range.b) shl Shift.b) or
    ((aPixel.Data.a and Range.a) shl Shift.a);
  case BitsPerPixel of
    8:           aData^  := data;
   16:     PWord(aData)^ := data;
   32: PCardinal(aData)^ := data;
   64:    PQWord(aData)^ := data;
  else
    raise EglBitmap.CreateFmt('invalid pixel size: %d', [BitsPerPixel]);
  end;
  inc(aData, Round(BytesPerPixel));
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpBitfieldFormat.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);
var
  data: QWord;
  i: Integer;
begin
  case BitsPerPixel of
     8: data :=           aData^;
    16: data :=     PWord(aData)^;
    32: data := PCardinal(aData)^;
    64: data :=    PQWord(aData)^;
  else
    raise EglBitmap.CreateFmt('invalid pixel size: %d', [BitsPerPixel]);
  end;
  for i := 0 to 3 do
    aPixel.Data.arr[i] := (data shr fShift.arr[i]) and Range.arr[i];
  inc(aData, Round(BytesPerPixel));
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TColorTableFormat///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpColorTableFormat.SetValues;
begin
  inherited SetValues;
  fShift := glBitmapRec4ub(8, 8, 8, 0);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpColorTableFormat.SetCustomValues(const aFormat: TglBitmapFormat; const aBPP: Integer; const aPrec, aShift: TglBitmapRec4ub);
begin
  fFormat       := aFormat;
  fBitsPerPixel := aBPP;
  fPrecision    := aPrec;
  fShift        := aShift;
  CalcValues;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpColorTableFormat.CalcValues;
begin
  inherited CalcValues;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpColorTableFormat.CreateColorTable;
var
  i: Integer;
begin
  SetLength(fColorTable, 256);
  if not HasColor then begin
    // alpha
    for i := 0 to High(fColorTable) do begin
      fColorTable[i].r := Round(((i shr Shift.a) and Range.a) / Range.a * 255);
      fColorTable[i].g := Round(((i shr Shift.a) and Range.a) / Range.a * 255);
      fColorTable[i].b := Round(((i shr Shift.a) and Range.a) / Range.a * 255);
      fColorTable[i].a := 0;
    end;
  end else begin
    // normal
    for i := 0 to High(fColorTable) do begin
      fColorTable[i].r := Round(((i shr Shift.r) and Range.r) / Range.r * 255);
      fColorTable[i].g := Round(((i shr Shift.g) and Range.g) / Range.g * 255);
      fColorTable[i].b := Round(((i shr Shift.b) and Range.b) / Range.b * 255);
      fColorTable[i].a := 0;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TbmpColorTableFormat.CreateMappingData: Pointer;
begin
  result := Pointer(0);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpColorTableFormat.Map(const aPixel: TglBitmapPixelData; var aData: PByte; var aMapData: Pointer);
begin
  if (BitsPerPixel <> 8) then
    raise EglBitmapUnsupportedFormat.Create('color table are only supported for 8bit formats');
  if not HasColor then
    // alpha
    aData^ := aPixel.Data.a
  else
    // normal
    aData^ := Round(
      ((aPixel.Data.r shr Shift.r) and Range.r) * LUMINANCE_WEIGHT_R +
      ((aPixel.Data.g shr Shift.g) and Range.g) * LUMINANCE_WEIGHT_G +
      ((aPixel.Data.b shr Shift.b) and Range.b) * LUMINANCE_WEIGHT_B);
  inc(aData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TbmpColorTableFormat.Unmap(var aData: PByte; out aPixel: TglBitmapPixelData; var aMapData: Pointer);

  function ReadValue: Byte;
  var
    i: PtrUInt;
  begin
    if (BitsPerPixel = 8) then begin
      result := aData^;
      inc(aData);
    end else begin
      i := {%H-}PtrUInt(aMapData);
      if (BitsPerPixel > 1) then
        result := (aData^ shr i) and ((1 shl BitsPerPixel) - 1)
      else
        result := (aData^ shr (7-i)) and ((1 shl BitsPerPixel) - 1);
      inc(i, BitsPerPixel);
      while (i >= 8) do begin
        inc(aData);
        dec(i, 8);
      end;
      aMapData := {%H-}Pointer(i);
    end;
  end;

begin
  if (BitsPerPixel > 8) then
    raise EglBitmapUnsupportedFormat.Create('color table are only supported for 8bit formats');
  with fColorTable[ReadValue] do begin
    aPixel.Data.r := r;
    aPixel.Data.g := g;
    aPixel.Data.b := b;
    aPixel.Data.a := a;
  end;
end;

destructor TbmpColorTableFormat.Destroy;
begin
  SetLength(fColorTable, 0);
  inherited Destroy;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmap - Helper//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapConvertPixel(var aPixel: TglBitmapPixelData; const aSourceFD, aDestFD: TFormatDescriptor);
var
  i: Integer;
begin
  for i := 0 to 3 do begin
    if (aSourceFD.Range.arr[i] <> aDestFD.Range.arr[i]) then begin
      if (aSourceFD.Range.arr[i] > 0) then
        aPixel.Data.arr[i] := Round(aPixel.Data.arr[i] / aSourceFD.Range.arr[i] * aDestFD.Range.arr[i])
      else
        aPixel.Data.arr[i] := 0;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapConvertCopyFunc(var aFuncRec: TglBitmapFunctionRec);
begin
  with aFuncRec do begin
    if (Source.Range.r   > 0) then
      Dest.Data.r := Source.Data.r;
    if (Source.Range.g > 0) then
      Dest.Data.g := Source.Data.g;
    if (Source.Range.b  > 0) then
      Dest.Data.b := Source.Data.b;
    if (Source.Range.a > 0) then
      Dest.Data.a := Source.Data.a;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapConvertCalculateRGBAFunc(var aFuncRec: TglBitmapFunctionRec);
var
  i: Integer;
begin
  with aFuncRec do begin
    for i := 0 to 3 do
      if (Source.Range.arr[i] > 0) then
        Dest.Data.arr[i] := Round(Dest.Range.arr[i] * Source.Data.arr[i] / Source.Range.arr[i]);
  end;
end;

type
  TShiftData = packed record
    case Integer of
      0: (r, g, b, a: SmallInt);
      1: (arr: array[0..3] of SmallInt);
  end;
  PShiftData = ^TShiftData;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapConvertShiftRGBAFunc(var aFuncRec: TglBitmapFunctionRec);
var
  i: Integer;
begin
  with aFuncRec do
    for i := 0 to 3 do
      if (Source.Range.arr[i] > 0) then
        Dest.Data.arr[i] := Source.Data.arr[i] shr PShiftData(Args)^.arr[i];
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapInvertFunc(var aFuncRec: TglBitmapFunctionRec);
var
  i: Integer;
begin
  with aFuncRec do begin
    Dest.Data := Source.Data;
    for i := 0 to 3 do
      if ({%H-}PtrUInt(Args) and (1 shl i) > 0) then
        Dest.Data.arr[i] := Dest.Data.arr[i] xor Dest.Range.arr[i];
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapFillWithColorFunc(var aFuncRec: TglBitmapFunctionRec);
var
  i: Integer;
begin
  with aFuncRec do begin
    for i := 0 to 3 do
      Dest.Data.arr[i] := PglBitmapPixelData(Args)^.Data.arr[i];
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapAlphaFunc(var FuncRec: TglBitmapFunctionRec);
var
  Temp: Single;
begin
  with FuncRec do begin
    if (FuncRec.Args = nil) then begin //source has no alpha
      Temp :=
        Source.Data.r / Source.Range.r * ALPHA_WEIGHT_R +
        Source.Data.g / Source.Range.g * ALPHA_WEIGHT_G +
        Source.Data.b / Source.Range.b * ALPHA_WEIGHT_B;
      Dest.Data.a := Round(Dest.Range.a * Temp);
    end else
      Dest.Data.a := Round(Source.Data.a / Source.Range.a * Dest.Range.a);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapColorKeyAlphaFunc(var FuncRec: TglBitmapFunctionRec);
type
  PglBitmapPixelData = ^TglBitmapPixelData;
begin
  with FuncRec do begin
    Dest.Data.r := Source.Data.r;
    Dest.Data.g := Source.Data.g;
    Dest.Data.b := Source.Data.b;

    with PglBitmapPixelData(Args)^ do
      if ((Dest.Data.r <= Data.r) and (Dest.Data.r >= Range.r) and
          (Dest.Data.g <= Data.g) and (Dest.Data.g >= Range.g) and
          (Dest.Data.b <= Data.b) and (Dest.Data.b >= Range.b)) then
        Dest.Data.a := 0
      else
        Dest.Data.a := Dest.Range.a;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapValueAlphaFunc(var FuncRec: TglBitmapFunctionRec);
begin
  with FuncRec do begin
    Dest.Data.r := Source.Data.r;
    Dest.Data.g := Source.Data.g;
    Dest.Data.b := Source.Data.b;
    Dest.Data.a := PCardinal(Args)^;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure SwapRGB(aData: PByte; aWidth: Integer; const aHasAlpha: Boolean);
type
  PRGBPix = ^TRGBPix;
  TRGBPix = array [0..2] of byte;
var
  Temp: Byte;
begin
  while aWidth > 0 do begin
    Temp := PRGBPix(aData)^[0];
    PRGBPix(aData)^[0] := PRGBPix(aData)^[2];
    PRGBPix(aData)^[2] := Temp;

    if aHasAlpha then
      Inc(aData, 4)
    else
      Inc(aData, 3);
    dec(aWidth);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmapData///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.GetFormatDescriptor: TglBitmapFormatDescriptor;
begin
  result := TFormatDescriptor.Get(fFormat);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.GetWidth: Integer;
begin
  if (ffX in fDimension.Fields) then
    result := fDimension.X
  else
    result := -1;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.GetHeight: Integer;
begin
  if (ffY in fDimension.Fields) then
    result := fDimension.Y
  else
    result := -1;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.GetScanlines(const aIndex: Integer): PByte;
begin
  if fHasScanlines and (aIndex >= Low(fScanlines)) and (aIndex <= High(fScanlines)) then
    result := fScanlines[aIndex]
  else
    result := nil;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SetFormat(const aValue: TglBitmapFormat);
begin
  if fFormat = aValue then
    exit;
  if TFormatDescriptor.Get(Format).BitsPerPixel <> TFormatDescriptor.Get(aValue).BitsPerPixel then
    raise EglBitmapUnsupportedFormat.Create(Format);
  SetData(fData, aValue, Width, Height);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.PrepareResType(var aResource: String; var aResType: PChar);
var
  TempPos: Integer;
begin
  if not Assigned(aResType) then begin
    TempPos   := Pos('.', aResource);
    aResType  := PChar(UpperCase(Copy(aResource, TempPos + 1, Length(aResource) - TempPos)));
    aResource := UpperCase(Copy(aResource, 0, TempPos -1));
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.UpdateScanlines;
var
  w, h, i, LineWidth: Integer;
begin
  w := Width;
  h := Height;
  fHasScanlines := Assigned(fData) and (w > 0) and (h > 0);
  if fHasScanlines then begin
    SetLength(fScanlines, h);
    LineWidth := Trunc(w * FormatDescriptor.BytesPerPixel);
    for i := 0 to h-1 do begin
      fScanlines[i] := fData;
      Inc(fScanlines[i], i * LineWidth);
    end;
  end else
    SetLength(fScanlines, 0);
end;

{$IFDEF GLB_SUPPORT_PNG_READ}
{$IF DEFINED(GLB_LAZ_PNG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//PNG/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadPNG(const aStream: TStream): Boolean;
const
  MAGIC_LEN = 8;
  PNG_MAGIC: String[MAGIC_LEN] = #$89#$50#$4E#$47#$0D#$0A#$1A#$0A;
var
  reader: TLazReaderPNG;
  intf: TLazIntfImage;
  StreamPos: Int64;
  magic: String[MAGIC_LEN];
begin
  result := true;
  StreamPos := aStream.Position;

  SetLength(magic, MAGIC_LEN);
  aStream.Read(magic[1], MAGIC_LEN);
  aStream.Position := StreamPos;
  if (magic <> PNG_MAGIC) then begin
    result := false;
    exit;
  end;

  intf   := TLazIntfImage.Create(0, 0);
  reader := TLazReaderPNG.Create;
  try try
    reader.UpdateDescription := true;
    reader.ImageRead(aStream, intf);
    AssignFromLazIntfImage(intf);
  except
    result := false;
    aStream.Position := StreamPos;
    exit;
  end;
  finally
    reader.Free;
    intf.Free;
  end;
end;

{$ELSEIF DEFINED(GLB_SDL_IMAGE)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadPNG(const aStream: TStream): Boolean;
var
  Surface: PSDL_Surface;
  RWops: PSDL_RWops;
begin
  result := false;
  RWops := glBitmapCreateRWops(aStream);
  try
    if IMG_isPNG(RWops) > 0 then begin
      Surface := IMG_LoadPNG_RW(RWops);
      try
        AssignFromSurface(Surface);
        result := true;
      finally
        SDL_FreeSurface(Surface);
      end;
    end;
  finally
    SDL_FreeRW(RWops);
  end;
end;

{$ELSEIF DEFINED(GLB_LIB_PNG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmap_libPNG_read_func(png: png_structp; buffer: png_bytep; size: cardinal); cdecl;
begin
  TStream(png_get_io_ptr(png)).Read(buffer^, size);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadPNG(const aStream: TStream): Boolean;
var
  StreamPos: Int64;
  signature: array [0..7] of byte;
  png: png_structp;
  png_info: png_infop;

  TempHeight, TempWidth: Integer;
  Format: TglBitmapFormat;

  png_data: pByte;
  png_rows: array of pByte;
  Row, LineSize: Integer;
begin
  result := false;

  if not init_libPNG then
    raise Exception.Create('LoadPNG - unable to initialize libPNG.');

  try
    // signature
    StreamPos := aStream.Position;
    aStream.Read(signature{%H-}, 8);
    aStream.Position := StreamPos;

    if png_check_sig(@signature, 8) <> 0 then begin
      // png read struct
      png := png_create_read_struct(PNG_LIBPNG_VER_STRING, nil, nil, nil);
      if png = nil then
        raise EglBitmapException.Create('LoadPng - couldn''t create read struct.');

      // png info
      png_info := png_create_info_struct(png);
      if png_info = nil then begin
        png_destroy_read_struct(@png, nil, nil);
        raise EglBitmapException.Create('LoadPng - couldn''t create info struct.');
      end;

      // set read callback
      png_set_read_fn(png, aStream, glBitmap_libPNG_read_func);

      // read informations
      png_read_info(png, png_info);

      // size
      TempHeight := png_get_image_height(png, png_info);
      TempWidth := png_get_image_width(png, png_info);

      // format
      case png_get_color_type(png, png_info) of
        PNG_COLOR_TYPE_GRAY:
          Format := tfLuminance8ub1;
        PNG_COLOR_TYPE_GRAY_ALPHA:
          Format := tfLuminance8Alpha8us1;
        PNG_COLOR_TYPE_RGB:
          Format := tfRGB8ub3;
        PNG_COLOR_TYPE_RGB_ALPHA:
          Format := tfRGBA8ub4;
        else
          raise EglBitmapException.Create ('LoadPng - Unsupported Colortype found.');
      end;

      // cut upper 8 bit from 16 bit formats
      if png_get_bit_depth(png, png_info) > 8 then
        png_set_strip_16(png);

      // expand bitdepth smaller than 8
      if png_get_bit_depth(png, png_info) < 8 then
        png_set_expand(png);

      // allocating mem for scanlines
      LineSize := png_get_rowbytes(png, png_info);
      GetMem(png_data, TempHeight * LineSize);
      try
        SetLength(png_rows, TempHeight);
        for Row := Low(png_rows) to High(png_rows) do begin
          png_rows[Row] := png_data;
          Inc(png_rows[Row], Row * LineSize);
        end;

        // read complete image into scanlines
        png_read_image(png, @png_rows[0]);

        // read end
        png_read_end(png, png_info);

        // destroy read struct
        png_destroy_read_struct(@png, @png_info, nil);

        SetLength(png_rows, 0);

        // set new data
        SetData(png_data, Format, TempWidth, TempHeight);

        result := true;
      except
        if Assigned(png_data) then
          FreeMem(png_data);
        raise;
      end;
    end;
  finally
    quit_libPNG;
  end;
end;

{$ELSEIF DEFINED(GLB_PNGIMAGE)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadPNG(const aStream: TStream): Boolean;
var
  StreamPos: Int64;
  Png: TPNGObject;
  Header: String[8];
  Row, Col, PixSize, LineSize: Integer;
  NewImage, pSource, pDest, pAlpha: pByte;
  PngFormat: TglBitmapFormat;
  FormatDesc: TFormatDescriptor;

const
  PngHeader: String[8] = #137#80#78#71#13#10#26#10;

begin
  result := false;

  StreamPos := aStream.Position;
  aStream.Read(Header[0], SizeOf(Header));
  aStream.Position := StreamPos;

  {Test if the header matches}
  if Header = PngHeader then begin
    Png := TPNGObject.Create;
    try
      Png.LoadFromStream(aStream);

      case Png.Header.ColorType of
        COLOR_GRAYSCALE:
          PngFormat := tfLuminance8ub1;
        COLOR_GRAYSCALEALPHA:
          PngFormat := tfLuminance8Alpha8us1;
        COLOR_RGB:
          PngFormat := tfBGR8ub3;
        COLOR_RGBALPHA:
          PngFormat := tfBGRA8ub4;
        else
          raise EglBitmapException.Create ('LoadPng - Unsupported Colortype found.');
      end;

      FormatDesc := TFormatDescriptor.Get(PngFormat);
      PixSize    := Round(FormatDesc.PixelSize);
      LineSize   := FormatDesc.GetSize(Png.Header.Width, 1);

      GetMem(NewImage, LineSize * Integer(Png.Header.Height));
      try
        pDest := NewImage;

        case Png.Header.ColorType of
          COLOR_RGB, COLOR_GRAYSCALE:
            begin
              for Row := 0 to Png.Height -1 do begin
                Move (Png.Scanline[Row]^, pDest^, LineSize);
                Inc(pDest, LineSize);
              end;
            end;
          COLOR_RGBALPHA, COLOR_GRAYSCALEALPHA:
            begin
              PixSize := PixSize -1;

              for Row := 0 to Png.Height -1 do begin
                pSource := Png.Scanline[Row];
                pAlpha := pByte(Png.AlphaScanline[Row]);

                for Col := 0 to Png.Width -1 do begin
                  Move (pSource^, pDest^, PixSize);
                  Inc(pSource, PixSize);
                  Inc(pDest, PixSize);

                  pDest^ := pAlpha^;
                  inc(pAlpha);
                  Inc(pDest);
                end;
              end;
            end;
          else
            raise EglBitmapException.Create ('LoadPng - Unsupported Colortype found.');
        end;

        SetData(NewImage, PngFormat, Png.Header.Width, Png.Header.Height);

        result := true;
      except
        if Assigned(NewImage) then
          FreeMem(NewImage);
        raise;
      end;
    finally
      Png.Free;
    end;
  end;
end;
{$IFEND}
{$ENDIF}

{$IFDEF GLB_SUPPORT_PNG_WRITE}
{$IFDEF GLB_LIB_PNG}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmap_libPNG_write_func(png: png_structp; buffer: png_bytep; size: cardinal); cdecl;
begin
  TStream(png_get_io_ptr(png)).Write(buffer^, size);
end;
{$ENDIF}

{$IF DEFINED(GLB_LAZ_PNG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SavePNG(const aStream: TStream);
var
  png: TPortableNetworkGraphic;
  intf: TLazIntfImage;
  raw: TRawImage;
begin
  png  := TPortableNetworkGraphic.Create;
  intf := TLazIntfImage.Create(0, 0);
  try
    if not AssignToLazIntfImage(intf) then
      raise EglBitmap.Create('unable to create LazIntfImage from glBitmap');
    intf.GetRawImage(raw);
    png.LoadFromRawImage(raw, false);
    png.SaveToStream(aStream);
  finally
    png.Free;
    intf.Free;
  end;
end;

{$ELSEIF DEFINED(GLB_LIB_PNG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SavePNG(const aStream: TStream);
var
  png: png_structp;
  png_info: png_infop;
  png_rows: array of pByte;
  LineSize: Integer;
  ColorType: Integer;
  Row: Integer;
  FormatDesc: TFormatDescriptor;
begin
  if not (ftPNG in FormatGetSupportedFiles(Format)) then
    raise EglBitmapUnsupportedFormat.Create(Format);

  if not init_libPNG then
    raise Exception.Create('unable to initialize libPNG.');

  try
    case Format of
      tfAlpha8ub1, tfLuminance8ub1:
        ColorType := PNG_COLOR_TYPE_GRAY;
      tfLuminance8Alpha8us1:
        ColorType := PNG_COLOR_TYPE_GRAY_ALPHA;
      tfBGR8ub3, tfRGB8ub3:
        ColorType := PNG_COLOR_TYPE_RGB;
      tfBGRA8ub4, tfRGBA8ub4:
        ColorType := PNG_COLOR_TYPE_RGBA;
      else
        raise EglBitmapUnsupportedFormat.Create(Format);
    end;

    FormatDesc := TFormatDescriptor.Get(Format);
    LineSize := FormatDesc.GetSize(Width, 1);

    // creating array for scanline
    SetLength(png_rows, Height);
    try
      for Row := 0 to Height - 1 do begin
        png_rows[Row] := Data;
        Inc(png_rows[Row], Row * LineSize)
      end;

      // write struct
      png := png_create_write_struct(PNG_LIBPNG_VER_STRING, nil, nil, nil);
      if png = nil then
        raise EglBitmapException.Create('SavePng - couldn''t create write struct.');

      // create png info
      png_info := png_create_info_struct(png);
      if png_info = nil then begin
        png_destroy_write_struct(@png, nil);
        raise EglBitmapException.Create('SavePng - couldn''t create info struct.');
      end;

      // set read callback
      png_set_write_fn(png, aStream, glBitmap_libPNG_write_func, nil);

      // set compression
      png_set_compression_level(png, 6);

      if Format in [tfBGR8ub3, tfBGRA8ub4] then
        png_set_bgr(png);

      png_set_IHDR(png, png_info, Width, Height, 8, ColorType, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
      png_write_info(png, png_info);
      png_write_image(png, @png_rows[0]);
      png_write_end(png, png_info);
      png_destroy_write_struct(@png, @png_info);
    finally
      SetLength(png_rows, 0);
    end;
  finally
    quit_libPNG;
  end;
end;

{$ELSEIF DEFINED(GLB_PNGIMAGE)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SavePNG(const aStream: TStream);
var
  Png: TPNGObject;

  pSource, pDest: pByte;
  X, Y, PixSize: Integer;
  ColorType: Cardinal;
  Alpha: Boolean;

  pTemp: pByte;
  Temp: Byte;
begin
  if not (ftPNG in FormatGetSupportedFiles (Format)) then
    raise EglBitmapUnsupportedFormat.Create(Format);

  case Format of
    tfAlpha8ub1, tfLuminance8ub1: begin
      ColorType := COLOR_GRAYSCALE;
      PixSize   := 1;
      Alpha     := false;
    end;
    tfLuminance8Alpha8us1: begin
      ColorType := COLOR_GRAYSCALEALPHA;
      PixSize   := 1;
      Alpha     := true;
    end;
    tfBGR8ub3, tfRGB8ub3: begin
      ColorType := COLOR_RGB;
      PixSize   := 3;
      Alpha     := false;
    end;
    tfBGRA8ub4, tfRGBA8ub4: begin
      ColorType := COLOR_RGBALPHA;
      PixSize   := 3;
      Alpha     := true
    end;
  else
    raise EglBitmapUnsupportedFormat.Create(Format);
  end;

  Png := TPNGObject.CreateBlank(ColorType, 8, Width, Height);
  try
    // Copy ImageData
    pSource := Data;
    for Y := 0 to Height -1 do begin
      pDest := png.ScanLine[Y];
      for X := 0 to Width -1 do begin
        Move(pSource^, pDest^, PixSize);
        Inc(pDest, PixSize);
        Inc(pSource, PixSize);
        if Alpha then begin
          png.AlphaScanline[Y]^[X] := pSource^;
          Inc(pSource);
        end;
      end;

      // convert RGB line to BGR
      if Format in [tfRGB8ub3, tfRGBA8ub4] then begin
        pTemp := png.ScanLine[Y];
        for X := 0 to Width -1 do begin
          Temp := pByteArray(pTemp)^[0];
          pByteArray(pTemp)^[0] := pByteArray(pTemp)^[2];
          pByteArray(pTemp)^[2] := Temp;
          Inc(pTemp, 3);
        end;
      end;
    end;

    // Save to Stream
    Png.CompressionLevel := 6;
    Png.SaveToStream(aStream);
  finally
    FreeAndNil(Png);
  end;
end;
{$IFEND}
{$ENDIF}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//JPEG////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
{$IFDEF GLB_LIB_JPEG}
type
  glBitmap_libJPEG_source_mgr_ptr = ^glBitmap_libJPEG_source_mgr;
  glBitmap_libJPEG_source_mgr = record
    pub: jpeg_source_mgr;

    SrcStream: TStream;
    SrcBuffer: array [1..4096] of byte;
  end;

  glBitmap_libJPEG_dest_mgr_ptr = ^glBitmap_libJPEG_dest_mgr;
  glBitmap_libJPEG_dest_mgr = record
    pub: jpeg_destination_mgr;

    DestStream: TStream;
    DestBuffer: array [1..4096] of byte;
  end;

procedure glBitmap_libJPEG_error_exit(cinfo: j_common_ptr); cdecl;
begin
  //DUMMY
end;


procedure glBitmap_libJPEG_output_message(cinfo: j_common_ptr); cdecl;
begin
  //DUMMY
end;


procedure glBitmap_libJPEG_init_source(cinfo: j_decompress_ptr); cdecl;
begin
  //DUMMY
end;

procedure glBitmap_libJPEG_term_source(cinfo: j_decompress_ptr); cdecl;
begin
  //DUMMY
end;


procedure glBitmap_libJPEG_init_destination(cinfo: j_compress_ptr); cdecl;
begin
  //DUMMY
end;


//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmap_libJPEG_fill_input_buffer(cinfo: j_decompress_ptr): boolean; cdecl;
var
  src: glBitmap_libJPEG_source_mgr_ptr;
  bytes: integer;
begin
  src := glBitmap_libJPEG_source_mgr_ptr(cinfo^.src);

  bytes := src^.SrcStream.Read(src^.SrcBuffer[1], 4096);
	if (bytes <= 0) then begin
		src^.SrcBuffer[1] := $FF;
		src^.SrcBuffer[2] := JPEG_EOI;
		bytes := 2;
	end;

	src^.pub.next_input_byte := @(src^.SrcBuffer[1]);
	src^.pub.bytes_in_buffer := bytes;

  result := true;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmap_libJPEG_skip_input_data(cinfo: j_decompress_ptr; num_bytes: Longint); cdecl;
var
  src: glBitmap_libJPEG_source_mgr_ptr;
begin
  src := glBitmap_libJPEG_source_mgr_ptr(cinfo^.src);

  if num_bytes > 0 then begin
    // wanted byte isn't in buffer so set stream position and read buffer
    if num_bytes > src^.pub.bytes_in_buffer then begin
      src^.SrcStream.Position := src^.SrcStream.Position + num_bytes - src^.pub.bytes_in_buffer;
      src^.pub.fill_input_buffer(cinfo);
    end else begin
      // wanted byte is in buffer so only skip
  		inc(src^.pub.next_input_byte, num_bytes);
	  	dec(src^.pub.bytes_in_buffer, num_bytes);
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function glBitmap_libJPEG_empty_output_buffer(cinfo: j_compress_ptr): boolean; cdecl;
var
  dest: glBitmap_libJPEG_dest_mgr_ptr;
begin
  dest := glBitmap_libJPEG_dest_mgr_ptr(cinfo^.dest);

  if dest^.pub.free_in_buffer < Cardinal(Length(dest^.DestBuffer)) then begin
    // write complete buffer
    dest^.DestStream.Write(dest^.DestBuffer[1], SizeOf(dest^.DestBuffer));

    // reset buffer
    dest^.pub.next_output_byte := @dest^.DestBuffer[1];
    dest^.pub.free_in_buffer := Length(dest^.DestBuffer);
  end;

  result := true;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmap_libJPEG_term_destination(cinfo: j_compress_ptr); cdecl;
var
  Idx: Integer;
  dest: glBitmap_libJPEG_dest_mgr_ptr;
begin
  dest := glBitmap_libJPEG_dest_mgr_ptr(cinfo^.dest);

  for Idx := Low(dest^.DestBuffer) to High(dest^.DestBuffer) do begin
    // check for endblock
    if (Idx < High(dest^.DestBuffer)) and (dest^.DestBuffer[Idx] = $FF) and (dest^.DestBuffer[Idx +1] = JPEG_EOI) then begin
      // write endblock
      dest^.DestStream.Write(dest^.DestBuffer[Idx], 2);

      // leave
      break;
    end else
      dest^.DestStream.Write(dest^.DestBuffer[Idx], 1);
  end;
end;
{$ENDIF}

{$IFDEF GLB_SUPPORT_JPEG_READ}
{$IF DEFINED(GLB_LAZ_JPEG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadJPEG(const aStream: TStream): Boolean;
const
  MAGIC_LEN = 2;
  JPEG_MAGIC: String[MAGIC_LEN] = #$FF#$D8;
var
  intf: TLazIntfImage;
  reader: TFPReaderJPEG;
  StreamPos: Int64;
  magic: String[MAGIC_LEN];
begin
  result := true;
  StreamPos := aStream.Position;

  SetLength(magic, MAGIC_LEN);
  aStream.Read(magic[1], MAGIC_LEN);
  aStream.Position := StreamPos;
  if (magic <> JPEG_MAGIC) then begin
    result := false;
    exit;
  end;

  reader := TFPReaderJPEG.Create;
  intf := TLazIntfImage.Create(0, 0);
  try try
    intf.DataDescription := GetDescriptionFromDevice(0, 0, 0);
    reader.ImageRead(aStream, intf);
    AssignFromLazIntfImage(intf);
  except
    result := false;
    aStream.Position := StreamPos;
    exit;
  end;
  finally
    reader.Free;
    intf.Free;
  end;
end;

{$ELSEIF DEFINED(GLB_SDL_IMAGE)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadJPEG(const aStream: TStream): Boolean;
var
  Surface: PSDL_Surface;
  RWops: PSDL_RWops;
begin
  result := false;

  RWops := glBitmapCreateRWops(aStream);
  try
    if IMG_isJPG(RWops) > 0 then begin
      Surface := IMG_LoadJPG_RW(RWops);
      try
        AssignFromSurface(Surface);
        result := true;
      finally
        SDL_FreeSurface(Surface);
      end;
    end;
  finally
    SDL_FreeRW(RWops);
  end;
end;

{$ELSEIF DEFINED(GLB_LIB_JPEG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadJPEG(const aStream: TStream): Boolean;
var
  StreamPos: Int64;
  Temp: array[0..1]of Byte;

  jpeg: jpeg_decompress_struct;
  jpeg_err: jpeg_error_mgr;

  IntFormat: TglBitmapFormat;
  pImage: pByte;
  TempHeight, TempWidth: Integer;

  pTemp: pByte;
  Row: Integer;

  FormatDesc: TFormatDescriptor;
begin
  result := false;

  if not init_libJPEG then
    raise Exception.Create('LoadJPG - unable to initialize libJPEG.');

  try
    // reading first two bytes to test file and set cursor back to begin
    StreamPos := aStream.Position;
    aStream.Read({%H-}Temp[0], 2);
    aStream.Position := StreamPos;

    // if Bitmap then read file.
    if ((Temp[0] = $FF) and (Temp[1] = $D8)) then begin
      FillChar(jpeg{%H-}, SizeOf(jpeg_decompress_struct), $00);
      FillChar(jpeg_err{%H-}, SizeOf(jpeg_error_mgr), $00);

      // error managment
      jpeg.err := jpeg_std_error(@jpeg_err);
      jpeg_err.error_exit     := glBitmap_libJPEG_error_exit;
      jpeg_err.output_message := glBitmap_libJPEG_output_message;

      // decompression struct
      jpeg_create_decompress(@jpeg);

      // allocation space for streaming methods
      jpeg.src := jpeg.mem^.alloc_small(@jpeg, JPOOL_PERMANENT, SizeOf(glBitmap_libJPEG_source_mgr));

      // seeting up custom functions
      with glBitmap_libJPEG_source_mgr_ptr(jpeg.src)^ do begin
        pub.init_source       := glBitmap_libJPEG_init_source;
        pub.fill_input_buffer := glBitmap_libJPEG_fill_input_buffer;
        pub.skip_input_data   := glBitmap_libJPEG_skip_input_data;
        pub.resync_to_restart := jpeg_resync_to_restart; // use default method
        pub.term_source       := glBitmap_libJPEG_term_source;

        pub.bytes_in_buffer := 0;     // forces fill_input_buffer on first read
        pub.next_input_byte := nil;   // until buffer loaded

        SrcStream := aStream;
      end;

      // set global decoding state
      jpeg.global_state := DSTATE_START;

      // read header of jpeg
      jpeg_read_header(@jpeg, false);

      // setting output parameter
      case jpeg.jpeg_color_space of
        JCS_GRAYSCALE:
          begin
            jpeg.out_color_space := JCS_GRAYSCALE;
            IntFormat := tfLuminance8ub1;
          end;
        else
          jpeg.out_color_space := JCS_RGB;
          IntFormat := tfRGB8ub3;
      end;

      // reading image
      jpeg_start_decompress(@jpeg);

      TempHeight := jpeg.output_height;
      TempWidth := jpeg.output_width;

      FormatDesc := TFormatDescriptor.Get(IntFormat);

      // creating new image
      GetMem(pImage, FormatDesc.GetSize(TempWidth, TempHeight));
      try
        pTemp := pImage;

        for Row := 0 to TempHeight -1 do begin
          jpeg_read_scanlines(@jpeg, @pTemp, 1);
          Inc(pTemp, FormatDesc.GetSize(TempWidth, 1));
        end;

        // finish decompression
        jpeg_finish_decompress(@jpeg);

        // destroy decompression
        jpeg_destroy_decompress(@jpeg);

        SetData(pImage, IntFormat, TempWidth, TempHeight);

        result := true;
      except
        if Assigned(pImage) then
          FreeMem(pImage);
        raise;
      end;
    end;
  finally
    quit_libJPEG;
  end;
end;

{$ELSEIF DEFINED(GLB_DELPHI_JPEG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadJPEG(const aStream: TStream): Boolean;
var
  bmp: TBitmap;
  jpg: TJPEGImage;
  StreamPos: Int64;
  Temp: array[0..1]of Byte;
begin
  result := false;

  // reading first two bytes to test file and set cursor back to begin
  StreamPos := aStream.Position;
  aStream.Read(Temp[0], 2);
  aStream.Position := StreamPos;

  // if Bitmap then read file.
  if ((Temp[0] = $FF) and (Temp[1] = $D8)) then begin
    bmp := TBitmap.Create;
    try
      jpg := TJPEGImage.Create;
      try
        jpg.LoadFromStream(aStream);
        bmp.Assign(jpg);
        result := AssignFromBitmap(bmp);
      finally
        jpg.Free;
      end;
    finally
      bmp.Free;
    end;
  end;
end;
{$IFEND}
{$ENDIF}

{$IFDEF GLB_SUPPORT_JPEG_WRITE}
{$IF DEFINED(GLB_LAZ_JPEG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SaveJPEG(const aStream: TStream);
var
  jpeg: TJPEGImage;
  intf: TLazIntfImage;
  raw: TRawImage;
begin
  jpeg := TJPEGImage.Create;
  intf := TLazIntfImage.Create(0, 0);
  try
    if not AssignToLazIntfImage(intf) then
      raise EglBitmap.Create('unable to create LazIntfImage from glBitmap');
    intf.GetRawImage(raw);
    jpeg.LoadFromRawImage(raw, false);
    jpeg.SaveToStream(aStream);
  finally
    intf.Free;
    jpeg.Free;
  end;
end;

{$ELSEIF DEFINED(GLB_LIB_JPEG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SaveJPEG(const aStream: TStream);
var
  jpeg: jpeg_compress_struct;
  jpeg_err: jpeg_error_mgr;
  Row: Integer;
  pTemp, pTemp2: pByte;

  procedure CopyRow(pDest, pSource: pByte);
  var
    X: Integer;
  begin
    for X := 0 to Width - 1 do begin
      pByteArray(pDest)^[0] := pByteArray(pSource)^[2];
      pByteArray(pDest)^[1] := pByteArray(pSource)^[1];
      pByteArray(pDest)^[2] := pByteArray(pSource)^[0];
      Inc(pDest, 3);
      Inc(pSource, 3);
    end;
  end;

begin
  if not (ftJPEG in FormatGetSupportedFiles(Format)) then
    raise EglBitmapUnsupportedFormat.Create(Format);

  if not init_libJPEG then
    raise Exception.Create('SaveJPG - unable to initialize libJPEG.');

  try
    FillChar(jpeg{%H-}, SizeOf(jpeg_compress_struct), $00);
    FillChar(jpeg_err{%H-}, SizeOf(jpeg_error_mgr), $00);

    // error managment
    jpeg.err := jpeg_std_error(@jpeg_err);
    jpeg_err.error_exit     := glBitmap_libJPEG_error_exit;
    jpeg_err.output_message := glBitmap_libJPEG_output_message;

    // compression struct
    jpeg_create_compress(@jpeg);

    // allocation space for streaming methods
    jpeg.dest := jpeg.mem^.alloc_small(@jpeg, JPOOL_PERMANENT, SizeOf(glBitmap_libJPEG_dest_mgr));

    // seeting up custom functions
    with glBitmap_libJPEG_dest_mgr_ptr(jpeg.dest)^ do begin
      pub.init_destination    := glBitmap_libJPEG_init_destination;
      pub.empty_output_buffer := glBitmap_libJPEG_empty_output_buffer;
      pub.term_destination    := glBitmap_libJPEG_term_destination;

      pub.next_output_byte  := @DestBuffer[1];
      pub.free_in_buffer    := Length(DestBuffer);

      DestStream := aStream;
    end;

    // very important state
    jpeg.global_state := CSTATE_START;
    jpeg.image_width  := Width;
    jpeg.image_height := Height;
    case Format of
      tfAlpha8ub1, tfLuminance8ub1: begin
        jpeg.input_components := 1;
        jpeg.in_color_space   := JCS_GRAYSCALE;
      end;
      tfRGB8ub3, tfBGR8ub3: begin
        jpeg.input_components := 3;
        jpeg.in_color_space   := JCS_RGB;
      end;
    end;

    jpeg_set_defaults(@jpeg);
    jpeg_set_quality(@jpeg, 95, true);
    jpeg_start_compress(@jpeg, true);
    pTemp := Data;

    if Format = tfBGR8ub3 then
      GetMem(pTemp2, fRowSize)
    else
      pTemp2 := pTemp;

    try
      for Row := 0 to jpeg.image_height -1 do begin
        // prepare row
        if Format = tfBGR8ub3 then
          CopyRow(pTemp2, pTemp)
        else
          pTemp2 := pTemp;

        // write row
        jpeg_write_scanlines(@jpeg, @pTemp2, 1);
        inc(pTemp, fRowSize);
      end;
    finally
      // free memory
      if Format = tfBGR8ub3 then
        FreeMem(pTemp2);
    end;
    jpeg_finish_compress(@jpeg);
    jpeg_destroy_compress(@jpeg);
  finally
    quit_libJPEG;
  end;
end;

{$ELSEIF DEFINED(GLB_DELPHI_JPEG)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SaveJPEG(const aStream: TStream);
var
  Bmp: TBitmap;
  Jpg: TJPEGImage;
begin
  if not (ftJPEG in FormatGetSupportedFiles(Format)) then
    raise EglBitmapUnsupportedFormat.Create(Format);

  Bmp := TBitmap.Create;
  try
    Jpg := TJPEGImage.Create;
    try
      AssignToBitmap(Bmp);
      if (Format in [tfAlpha8ub1, tfLuminance8ub1]) then begin
        Jpg.Grayscale   := true;
        Jpg.PixelFormat := jf8Bit;
      end;
      Jpg.Assign(Bmp);
      Jpg.SaveToStream(aStream);
    finally
      FreeAndNil(Jpg);
    end;
  finally
    FreeAndNil(Bmp);
  end;
end;
{$IFEND}
{$ENDIF}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//RAW/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
type
  RawHeader = packed record
    Magic:        String[5];
    Version:      Byte;
    Width:        Integer;
    Height:       Integer;
    DataSize:     Integer;
    BitsPerPixel: Integer;
    Precision:    TglBitmapRec4ub;
    Shift:        TglBitmapRec4ub;
  end;

function TglBitmapData.LoadRAW(const aStream: TStream): Boolean;
var
  header: RawHeader;
  StartPos: Int64;
  fd: TFormatDescriptor;
  buf: PByte;
begin
  result := false;
  StartPos := aStream.Position;
  aStream.Read(header{%H-}, SizeOf(header));
  if (header.Magic <> 'glBMP') then begin
    aStream.Position := StartPos;
    exit;
  end;

  fd := TFormatDescriptor.GetFromPrecShift(header.Precision, header.Shift, header.BitsPerPixel);
  if (fd.Format = tfEmpty) then
    raise EglBitmapUnsupportedFormat.Create('no supported format found');

  buf := GetMemory(header.DataSize);
  aStream.Read(buf^, header.DataSize);
  SetData(buf, fd.Format, header.Width, header.Height);

  result := true;
end;

procedure TglBitmapData.SaveRAW(const aStream: TStream);
var
  header: RawHeader;
  fd: TFormatDescriptor;
begin
  fd := TFormatDescriptor.Get(Format);
  header.Magic        := 'glBMP';
  header.Version      := 1;
  header.Width        := Width;
  header.Height       := Height;
  header.DataSize     := fd.GetSize(fDimension);
  header.BitsPerPixel := fd.BitsPerPixel;
  header.Precision    := fd.Precision;
  header.Shift        := fd.Shift;
  aStream.Write(header, SizeOf(header));
  aStream.Write(Data^,  header.DataSize);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//BMP/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
const
  BMP_MAGIC          = $4D42;

  BMP_COMP_RGB       = 0;
  BMP_COMP_RLE8      = 1;
  BMP_COMP_RLE4      = 2;
  BMP_COMP_BITFIELDS = 3;

type
  TBMPHeader = packed record
    bfType: Word;
    bfSize: Cardinal;
    bfReserved1: Word;
    bfReserved2: Word;
    bfOffBits: Cardinal;
  end;

  TBMPInfo = packed record
    biSize: Cardinal;
    biWidth: Longint;
    biHeight: Longint;
    biPlanes: Word;
    biBitCount: Word;
    biCompression: Cardinal;
    biSizeImage: Cardinal;
    biXPelsPerMeter: Longint;
    biYPelsPerMeter: Longint;
    biClrUsed: Cardinal;
    biClrImportant: Cardinal;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadBMP(const aStream: TStream): Boolean;

  //////////////////////////////////////////////////////////////////////////////////////////////////
  function ReadInfo(out aInfo: TBMPInfo; out aMask: TglBitmapRec4ul): TglBitmapFormat;
  var
    tmp, i: Cardinal;
  begin
    result := tfEmpty;
    aStream.Read(aInfo{%H-}, SizeOf(aInfo));
    FillChar(aMask{%H-}, SizeOf(aMask), 0);

    //Read Compression
    case aInfo.biCompression of
      BMP_COMP_RLE4,
      BMP_COMP_RLE8: begin
        raise EglBitmap.Create('RLE compression is not supported');
      end;
      BMP_COMP_BITFIELDS: begin
        if (aInfo.biBitCount = 16) or (aInfo.biBitCount = 32) then begin
          for i := 0 to 2 do begin
            aStream.Read(tmp{%H-}, SizeOf(tmp));
            aMask.arr[i] := tmp;
          end;
        end else
          raise EglBitmap.Create('Bitfields are only supported for 16bit and 32bit formats');
      end;
    end;

    //get suitable format
    case aInfo.biBitCount of
       8: result := tfLuminance8ub1;
      16: result := tfX1RGB5us1;
      24: result := tfBGR8ub3;
      32: result := tfXRGB8ui1;
    end;
  end;

  function ReadColorTable(var aFormat: TglBitmapFormat; const aInfo: TBMPInfo): TbmpColorTableFormat;
  var
    i, c: Integer;
    fd: TFormatDescriptor;
    ColorTable: TbmpColorTable;
  begin
    result := nil;
    if (aInfo.biBitCount >= 16) then
      exit;
    aFormat := tfLuminance8ub1;
    c := aInfo.biClrUsed;
    if (c = 0) then
      c := 1 shl aInfo.biBitCount;
    SetLength(ColorTable, c);
    for i := 0 to c-1 do begin
      aStream.Read(ColorTable[i], SizeOf(TbmpColorTableEnty));
      if (ColorTable[i].r <> ColorTable[i].g) or (ColorTable[i].g <> ColorTable[i].b) then
        aFormat := tfRGB8ub3;
    end;

    fd := TFormatDescriptor.Get(aFormat);
    result := TbmpColorTableFormat.Create;
    result.ColorTable   := ColorTable;
    result.SetCustomValues(aFormat, aInfo.biBitCount, fd.Precision, fd.Shift);
  end;

  //////////////////////////////////////////////////////////////////////////////////////////////////
  function CheckBitfields(var aFormat: TglBitmapFormat; const aMask: TglBitmapRec4ul; const aInfo: TBMPInfo): TbmpBitfieldFormat;
  var
    fd: TFormatDescriptor;
  begin
    result := nil;
    if (aMask.r <> 0) or (aMask.g <> 0) or (aMask.b <> 0) or (aMask.a <> 0) then begin

      // find suitable format ...
      fd := TFormatDescriptor.GetFromMask(aMask);
      if (fd.Format <> tfEmpty) then begin
        aFormat := fd.Format;
        exit;
      end;

      // or create custom bitfield format
      result := TbmpBitfieldFormat.Create;
      result.SetCustomValues(aInfo.biBitCount, aMask);
    end;
  end;

var
  //simple types
  StartPos: Int64;
  ImageSize, rbLineSize, wbLineSize, Padding, i: Integer;
  PaddingBuff: Cardinal;
  LineBuf, ImageData, TmpData: PByte;
  SourceMD, DestMD: Pointer;
  BmpFormat: TglBitmapFormat;

  //records
  Mask: TglBitmapRec4ul;
  Header: TBMPHeader;
  Info: TBMPInfo;

  //classes
  SpecialFormat: TFormatDescriptor;
  FormatDesc: TFormatDescriptor;

  //////////////////////////////////////////////////////////////////////////////////////////////////
  procedure SpecialFormatReadLine(aData: PByte; aLineBuf: PByte);
  var
    i: Integer;
    Pixel: TglBitmapPixelData;
  begin
    aStream.Read(aLineBuf^, rbLineSize);
    SpecialFormat.PreparePixel(Pixel);
    for i := 0 to Info.biWidth-1 do begin
      SpecialFormat.Unmap(aLineBuf, Pixel, SourceMD);
      glBitmapConvertPixel(Pixel, SpecialFormat, FormatDesc);
      FormatDesc.Map(Pixel, aData, DestMD);
    end;
  end;

begin
  result        := false;
  BmpFormat     := tfEmpty;
  SpecialFormat := nil;
  LineBuf       := nil;
  SourceMD      := nil;
  DestMD        := nil;

  // Header
  StartPos := aStream.Position;
  aStream.Read(Header{%H-}, SizeOf(Header));

  if Header.bfType = BMP_MAGIC then begin
    try try
      BmpFormat        := ReadInfo(Info, Mask);
      SpecialFormat    := ReadColorTable(BmpFormat, Info);
      if not Assigned(SpecialFormat) then
        SpecialFormat  := CheckBitfields(BmpFormat, Mask, Info);
      aStream.Position := StartPos + Header.bfOffBits;

      if (BmpFormat <> tfEmpty) then begin
        FormatDesc := TFormatDescriptor.Get(BmpFormat);
        rbLineSize := Round(Info.biWidth * Info.biBitCount / 8); //ReadBuffer LineSize
        wbLineSize := Trunc(Info.biWidth * FormatDesc.BytesPerPixel);
        Padding    := (((Info.biWidth * Info.biBitCount + 31) and - 32) shr 3) - rbLineSize;

        //get Memory
        DestMD    := FormatDesc.CreateMappingData;
        ImageSize := FormatDesc.GetSize(Info.biWidth, abs(Info.biHeight));
        GetMem(ImageData, ImageSize);
        if Assigned(SpecialFormat) then begin
          GetMem(LineBuf, rbLineSize); //tmp Memory for converting Bitfields
          SourceMD := SpecialFormat.CreateMappingData;
        end;

        //read Data
        try try
          FillChar(ImageData^, ImageSize, $FF);
          TmpData := ImageData;
          if (Info.biHeight > 0) then
            Inc(TmpData, wbLineSize * (Info.biHeight-1));
          for i := 0 to Abs(Info.biHeight)-1 do begin
            if Assigned(SpecialFormat) then
              SpecialFormatReadLine(TmpData, LineBuf)  //if is special format read and convert data
            else
              aStream.Read(TmpData^, wbLineSize);   //else only read data
            if (Info.biHeight > 0) then
              dec(TmpData, wbLineSize)
            else
              inc(TmpData, wbLineSize);
            aStream.Read(PaddingBuff{%H-}, Padding);
          end;
          SetData(ImageData, BmpFormat, Info.biWidth, abs(Info.biHeight));
          result := true;
        finally
          if Assigned(LineBuf) then
            FreeMem(LineBuf);
          if Assigned(SourceMD) then
            SpecialFormat.FreeMappingData(SourceMD);
          FormatDesc.FreeMappingData(DestMD);
        end;
        except
          if Assigned(ImageData) then
            FreeMem(ImageData);
          raise;
        end;
      end else
        raise EglBitmap.Create('LoadBMP - No suitable format found');
    except
      aStream.Position := StartPos;
      raise;
    end;
    finally
      FreeAndNil(SpecialFormat);
    end;
  end
    else aStream.Position := StartPos;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SaveBMP(const aStream: TStream);
var
  Header: TBMPHeader;
  Info: TBMPInfo;
  Converter: TFormatDescriptor;
  FormatDesc: TFormatDescriptor;
  SourceFD, DestFD: Pointer;
  pData, srcData, dstData, ConvertBuffer: pByte;

  Pixel: TglBitmapPixelData;
  ImageSize, wbLineSize, rbLineSize, Padding, LineIdx, PixelIdx: Integer;
  RedMask, GreenMask, BlueMask, AlphaMask: Cardinal;

  PaddingBuff: Cardinal;

  function GetLineWidth : Integer;
  begin
    result := ((Info.biWidth * Info.biBitCount + 31) and - 32) shr 3;
  end;

begin
  if not (ftBMP in FormatGetSupportedFiles(Format)) then
    raise EglBitmapUnsupportedFormat.Create(Format);

  Converter  := nil;
  FormatDesc := TFormatDescriptor.Get(Format);
  ImageSize  := FormatDesc.GetSize(Dimension);

  FillChar(Header{%H-}, SizeOf(Header), 0);
  Header.bfType      := BMP_MAGIC;
  Header.bfSize      := SizeOf(Header) + SizeOf(Info) + ImageSize;
  Header.bfReserved1 := 0;
  Header.bfReserved2 := 0;
  Header.bfOffBits   := SizeOf(Header) + SizeOf(Info);

  FillChar(Info{%H-}, SizeOf(Info), 0);
  Info.biSize        := SizeOf(Info);
  Info.biWidth       := Width;
  Info.biHeight      := Height;
  Info.biPlanes      := 1;
  Info.biCompression := BMP_COMP_RGB;
  Info.biSizeImage   := ImageSize;

  try
    case Format of
      tfAlpha4ub1, tfAlpha8ub1, tfLuminance4ub1, tfLuminance8ub1, tfR3G3B2ub1:
      begin
        Info.biBitCount  :=  8;
        Header.bfSize    := Header.bfSize    + 256 * SizeOf(Cardinal);
        Header.bfOffBits := Header.bfOffBits + 256 * SizeOf(Cardinal); //256 ColorTable entries
        Converter := TbmpColorTableFormat.Create;
        with (Converter as TbmpColorTableFormat) do begin
          SetCustomValues(fFormat, 8, FormatDesc.Precision, FormatDesc.Shift);
          CreateColorTable;
        end;
      end;

      tfLuminance4Alpha4ub2, tfLuminance6Alpha2ub2, tfLuminance8Alpha8ub2,
      tfRGBX4us1, tfXRGB4us1, tfRGB5X1us1, tfX1RGB5us1, tfR5G6B5us1, tfRGB5A1us1, tfA1RGB5us1, tfRGBA4us1, tfARGB4us1,
      tfBGRX4us1, tfXBGR4us1, tfBGR5X1us1, tfX1BGR5us1, tfB5G6R5us1, tfBGR5A1us1, tfA1BGR5us1, tfBGRA4us1, tfABGR4us1:
      begin
        Info.biBitCount    := 16;
        Info.biCompression := BMP_COMP_BITFIELDS;
      end;

      tfBGR8ub3, tfRGB8ub3:
      begin
        Info.biBitCount := 24;
        if (Format = tfRGB8ub3) then
          Converter := TfdBGR8ub3.Create; //use BGR8 Format Descriptor to Swap RGB Values
      end;

      tfRGBX8ui1, tfXRGB8ui1, tfRGB10X2ui1, tfX2RGB10ui1, tfRGBA8ui1, tfARGB8ui1, tfRGBA8ub4, tfRGB10A2ui1, tfA2RGB10ui1,
      tfBGRX8ui1, tfXBGR8ui1, tfBGR10X2ui1, tfX2BGR10ui1, tfBGRA8ui1, tfABGR8ui1, tfBGRA8ub4, tfBGR10A2ui1, tfA2BGR10ui1:
      begin
        Info.biBitCount    := 32;
        Info.biCompression := BMP_COMP_BITFIELDS;
      end;
    else
      raise EglBitmapUnsupportedFormat.Create(Format);
    end;
    Info.biXPelsPerMeter := 2835;
    Info.biYPelsPerMeter := 2835;

    // prepare bitmasks
    if Info.biCompression = BMP_COMP_BITFIELDS then begin
      Header.bfSize    := Header.bfSize    + 4 * SizeOf(Cardinal);
      Header.bfOffBits := Header.bfOffBits + 4 * SizeOf(Cardinal);

      RedMask    := FormatDesc.Mask.r;
      GreenMask  := FormatDesc.Mask.g;
      BlueMask   := FormatDesc.Mask.b;
      AlphaMask  := FormatDesc.Mask.a;
    end;

    // headers
    aStream.Write(Header, SizeOf(Header));
    aStream.Write(Info, SizeOf(Info));

    // colortable
    if Assigned(Converter) and (Converter is TbmpColorTableFormat) then
      with (Converter as TbmpColorTableFormat) do
        aStream.Write(ColorTable[0].b,
          SizeOf(TbmpColorTableEnty) * Length(ColorTable));

    // bitmasks
    if Info.biCompression = BMP_COMP_BITFIELDS then begin
      aStream.Write(RedMask,   SizeOf(Cardinal));
      aStream.Write(GreenMask, SizeOf(Cardinal));
      aStream.Write(BlueMask,  SizeOf(Cardinal));
      aStream.Write(AlphaMask, SizeOf(Cardinal));
    end;

    // image data
    rbLineSize  := Round(Info.biWidth * FormatDesc.BytesPerPixel);
    wbLineSize  := Round(Info.biWidth * Info.biBitCount / 8);
    Padding     := GetLineWidth - wbLineSize;
    PaddingBuff := 0;

    pData := Data;
    inc(pData, (Height-1) * rbLineSize);

    // prepare row buffer. But only for RGB because RGBA supports color masks
    // so it's possible to change color within the image.
    if Assigned(Converter) then begin
      FormatDesc.PreparePixel(Pixel);
      GetMem(ConvertBuffer, wbLineSize);
      SourceFD := FormatDesc.CreateMappingData;
      DestFD   := Converter.CreateMappingData;
    end else
      ConvertBuffer := nil;

    try
      for LineIdx := 0 to Height - 1 do begin
        // preparing row
        if Assigned(Converter) then begin
          srcData := pData;
          dstData := ConvertBuffer;
          for PixelIdx := 0 to Info.biWidth-1 do begin
            FormatDesc.Unmap(srcData, Pixel, SourceFD);
            glBitmapConvertPixel(Pixel, FormatDesc, Converter);
            Converter.Map(Pixel, dstData, DestFD);
          end;
          aStream.Write(ConvertBuffer^, wbLineSize);
        end else begin
          aStream.Write(pData^, rbLineSize);
        end;
        dec(pData, rbLineSize);
        if (Padding > 0) then
          aStream.Write(PaddingBuff, Padding);
      end;
    finally
      // destroy row buffer
      if Assigned(ConvertBuffer) then begin
        FormatDesc.FreeMappingData(SourceFD);
        Converter.FreeMappingData(DestFD);
        FreeMem(ConvertBuffer);
      end;
    end;
  finally
    if Assigned(Converter) then
      Converter.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TGA/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
type
  TTGAHeader = packed record
    ImageID: Byte;
    ColorMapType: Byte;
    ImageType: Byte;
    //ColorMapSpec: Array[0..4] of Byte;
    ColorMapStart: Word;
    ColorMapLength: Word;
    ColorMapEntrySize: Byte;
    OrigX: Word;
    OrigY: Word;
    Width: Word;
    Height: Word;
    Bpp: Byte;
    ImageDesc: Byte;
  end;

const
  TGA_UNCOMPRESSED_RGB  =  2;
  TGA_UNCOMPRESSED_GRAY =  3;
  TGA_COMPRESSED_RGB    = 10;
  TGA_COMPRESSED_GRAY   = 11;

  TGA_NONE_COLOR_TABLE  = 0;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadTGA(const aStream: TStream): Boolean;
var
  Header: TTGAHeader;
  ImageData: System.PByte;
  StartPosition: Int64;
  PixelSize, LineSize: Integer;
  tgaFormat: TglBitmapFormat;
  FormatDesc: TFormatDescriptor;
  Counter: packed record
    X, Y: packed record
      low, high, dir: Integer;
    end;
  end;

const
  CACHE_SIZE = $4000;

  ////////////////////////////////////////////////////////////////////////////////////////
  procedure ReadUncompressed;
  var
    i, j: Integer;
    buf, tmp1, tmp2: System.PByte;
  begin
    buf := nil;
    if (Counter.X.dir < 0) then
      GetMem(buf, LineSize);
    try
      while (Counter.Y.low <> Counter.Y.high + counter.Y.dir) do begin
        tmp1 := ImageData;
        inc(tmp1, (Counter.Y.low * LineSize));          //pointer to LineStart
        if (Counter.X.dir < 0) then begin               //flip X
          aStream.Read(buf^, LineSize);
          tmp2 := buf;
          inc(tmp2, LineSize - PixelSize);              //pointer to last pixel in line
          for i := 0 to Header.Width-1 do begin         //for all pixels in line
            for j := 0 to PixelSize-1 do begin          //for all bytes in pixel
              tmp1^ := tmp2^;
              inc(tmp1);
              inc(tmp2);
            end;
            dec(tmp2, 2*PixelSize);                     //move 2 backwards, because j-loop moved 1 forward
          end;
        end else
          aStream.Read(tmp1^, LineSize);
        inc(Counter.Y.low, Counter.Y.dir);              //move to next line index
      end;
    finally
      if Assigned(buf) then
        FreeMem(buf);
    end;
  end;

  ////////////////////////////////////////////////////////////////////////////////////////
  procedure ReadCompressed;

    /////////////////////////////////////////////////////////////////
    var
      TmpData: System.PByte;
      LinePixelsRead: Integer;
    procedure CheckLine;
    begin
      if (LinePixelsRead >= Header.Width) then begin
        LinePixelsRead := 0;
        inc(Counter.Y.low, Counter.Y.dir);                //next line index
        TmpData := ImageData;
        inc(TmpData, Counter.Y.low * LineSize);           //set line
        if (Counter.X.dir < 0) then                       //if x flipped then
          inc(TmpData, LineSize - PixelSize);             //set last pixel
      end;
    end;

    /////////////////////////////////////////////////////////////////
    var
      Cache: PByte;
      CacheSize, CachePos: Integer;
    procedure CachedRead(out Buffer; Count: Integer);
    var
      BytesRead: Integer;
    begin
      if (CachePos + Count > CacheSize) then begin
        //if buffer overflow save non read bytes
        BytesRead := 0;
        if (CacheSize - CachePos > 0) then begin
          BytesRead := CacheSize - CachePos;
          Move(PByteArray(Cache)^[CachePos], Buffer{%H-}, BytesRead);
          inc(CachePos, BytesRead);
        end;

        //load cache from file
        CacheSize := Min(CACHE_SIZE, aStream.Size - aStream.Position);
        aStream.Read(Cache^, CacheSize);
        CachePos := 0;

        //read rest of requested bytes
        if (Count - BytesRead > 0) then begin
          Move(PByteArray(Cache)^[CachePos], TByteArray(Buffer)[BytesRead], Count - BytesRead);
          inc(CachePos, Count - BytesRead);
        end;
      end else begin
        //if no buffer overflow just read the data
        Move(PByteArray(Cache)^[CachePos], Buffer, Count);
        inc(CachePos, Count);
      end;
    end;

    procedure PixelToBuffer(const aData: PByte; var aBuffer: PByte);
    begin
      case PixelSize of
        1: begin
          aBuffer^ := aData^;
          inc(aBuffer, Counter.X.dir);
        end;
        2: begin
          PWord(aBuffer)^ := PWord(aData)^;
          inc(aBuffer, 2 * Counter.X.dir);
        end;
        3: begin
          PByteArray(aBuffer)^[0] := PByteArray(aData)^[0];
          PByteArray(aBuffer)^[1] := PByteArray(aData)^[1];
          PByteArray(aBuffer)^[2] := PByteArray(aData)^[2];
          inc(aBuffer, 3 * Counter.X.dir);
        end;
        4: begin
          PCardinal(aBuffer)^ := PCardinal(aData)^;
          inc(aBuffer, 4 * Counter.X.dir);
        end;
      end;
    end;

  var
    TotalPixelsToRead, TotalPixelsRead: Integer;
    Temp: Byte;
    buf: array [0..3] of Byte; //1 pixel is max 32bit long
    PixelRepeat: Boolean;
    PixelsToRead, PixelCount: Integer;
  begin
    CacheSize := 0;
    CachePos  := 0;

    TotalPixelsToRead := Header.Width * Header.Height;
    TotalPixelsRead   := 0;
    LinePixelsRead    := 0;

    GetMem(Cache, CACHE_SIZE);
    try
      TmpData := ImageData;
      inc(TmpData, Counter.Y.low * LineSize);           //set line
      if (Counter.X.dir < 0) then                       //if x flipped then
        inc(TmpData, LineSize - PixelSize);             //set last pixel

      repeat
        //read CommandByte
        CachedRead(Temp, 1);
        PixelRepeat  := (Temp and $80) > 0;
        PixelsToRead := (Temp and $7F) + 1;
        inc(TotalPixelsRead, PixelsToRead);

        if PixelRepeat then
          CachedRead(buf[0], PixelSize);
        while (PixelsToRead > 0) do begin
          CheckLine;
          PixelCount := Min(Header.Width - LinePixelsRead, PixelsToRead); //max read to EOL or EOF
          while (PixelCount > 0) do begin
            if not PixelRepeat then
              CachedRead(buf[0], PixelSize);
            PixelToBuffer(@buf[0], TmpData);
            inc(LinePixelsRead);
            dec(PixelsToRead);
            dec(PixelCount);
          end;
        end;
      until (TotalPixelsRead >= TotalPixelsToRead);
    finally
      FreeMem(Cache);
    end;
  end;

  function IsGrayFormat: Boolean;
  begin
    result := Header.ImageType in [TGA_UNCOMPRESSED_GRAY, TGA_COMPRESSED_GRAY];
  end;

begin
  result := false;

  // reading header to test file and set cursor back to begin
  StartPosition := aStream.Position;
  aStream.Read(Header{%H-}, SizeOf(Header));

  // no colormapped files
  if (Header.ColorMapType = TGA_NONE_COLOR_TABLE) and (Header.ImageType in [
    TGA_UNCOMPRESSED_RGB, TGA_UNCOMPRESSED_GRAY, TGA_COMPRESSED_RGB, TGA_COMPRESSED_GRAY]) then
  begin
    try
      if Header.ImageID <> 0 then       // skip image ID
        aStream.Position := aStream.Position + Header.ImageID;

      tgaFormat := tfEmpty;
      case Header.Bpp of
         8: if IsGrayFormat then case (Header.ImageDesc and $F) of
               0: tgaFormat := tfLuminance8ub1;
               8: tgaFormat := tfAlpha8ub1;
            end;

        16: if IsGrayFormat then case (Header.ImageDesc and $F) of
               0: tgaFormat := tfLuminance16us1;
               8: tgaFormat := tfLuminance8Alpha8ub2;
            end else case (Header.ImageDesc and $F) of
               0: tgaFormat := tfX1RGB5us1;
               1: tgaFormat := tfA1RGB5us1;
               4: tgaFormat := tfARGB4us1;
            end;

        24: if not IsGrayFormat then case (Header.ImageDesc and $F) of
               0: tgaFormat := tfBGR8ub3;
            end;

        32: if IsGrayFormat then case (Header.ImageDesc and $F) of
               0: tgaFormat := tfDepth32ui1;
            end else case (Header.ImageDesc and $F) of
               0: tgaFormat := tfX2RGB10ui1;
               2: tgaFormat := tfA2RGB10ui1;
               8: tgaFormat := tfARGB8ui1;
            end;
      end;

      if (tgaFormat = tfEmpty) then
        raise EglBitmap.Create('LoadTga - unsupported format');

      FormatDesc := TFormatDescriptor.Get(tgaFormat);
      PixelSize  := FormatDesc.GetSize(1, 1);
      LineSize   := FormatDesc.GetSize(Header.Width, 1);

      GetMem(ImageData, LineSize * Header.Height);
      try
        //column direction
        if ((Header.ImageDesc and (1 shl 4)) > 0) then begin
          Counter.X.low  := Header.Height-1;;
          Counter.X.high := 0;
          Counter.X.dir  := -1;
        end else begin
          Counter.X.low  := 0;
          Counter.X.high := Header.Height-1;
          Counter.X.dir  := 1;
        end;

        // Row direction
        if ((Header.ImageDesc and (1 shl 5)) > 0) then begin
          Counter.Y.low  := 0;
          Counter.Y.high := Header.Height-1;
          Counter.Y.dir  := 1;
        end else begin
          Counter.Y.low  := Header.Height-1;;
          Counter.Y.high := 0;
          Counter.Y.dir  := -1;
        end;

        // Read Image
        case Header.ImageType of
          TGA_UNCOMPRESSED_RGB, TGA_UNCOMPRESSED_GRAY:
            ReadUncompressed;
          TGA_COMPRESSED_RGB, TGA_COMPRESSED_GRAY:
            ReadCompressed;
        end;

        SetData(ImageData, tgaFormat, Header.Width, Header.Height);
        result := true;
      except
        if Assigned(ImageData) then
          FreeMem(ImageData);
        raise;
      end;
    finally
      aStream.Position := StartPosition;
    end;
  end
    else aStream.Position := StartPosition;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SaveTGA(const aStream: TStream);
var
  Header: TTGAHeader;
  Size: Integer;
  FormatDesc: TFormatDescriptor;
begin
  if not (ftTGA in FormatGetSupportedFiles(Format)) then
    raise EglBitmapUnsupportedFormat.Create(Format);

  //prepare header
  FormatDesc := TFormatDescriptor.Get(Format);
  FillChar(Header{%H-}, SizeOf(Header), 0);
  Header.ImageDesc := CountSetBits(FormatDesc.Range.a) and $F;
  Header.Bpp       := FormatDesc.BitsPerPixel;
  Header.Width     := Width;
  Header.Height    := Height;
  Header.ImageDesc := Header.ImageDesc or $20; //flip y
  if FormatDesc.IsGrayscale or (not FormatDesc.IsGrayscale and not FormatDesc.HasRed and FormatDesc.HasAlpha) then
    Header.ImageType := TGA_UNCOMPRESSED_GRAY
  else
    Header.ImageType := TGA_UNCOMPRESSED_RGB;
  aStream.Write(Header, SizeOf(Header));

  // write Data
  Size := FormatDesc.GetSize(Dimension);
  aStream.Write(Data^, Size);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//DDS/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
const
  DDS_MAGIC: Cardinal         = $20534444;

  // DDS_header.dwFlags
  DDSD_CAPS                   = $00000001;
  DDSD_HEIGHT                 = $00000002;
  DDSD_WIDTH                  = $00000004;
  DDSD_PIXELFORMAT            = $00001000;

  // DDS_header.sPixelFormat.dwFlags
  DDPF_ALPHAPIXELS            = $00000001;
  DDPF_ALPHA                  = $00000002;
  DDPF_FOURCC                 = $00000004;
  DDPF_RGB                    = $00000040;
  DDPF_LUMINANCE              = $00020000;

  // DDS_header.sCaps.dwCaps1
  DDSCAPS_TEXTURE             = $00001000;

  // DDS_header.sCaps.dwCaps2
  DDSCAPS2_CUBEMAP            = $00000200;

  D3DFMT_DXT1                 = $31545844;
  D3DFMT_DXT3                 = $33545844;
  D3DFMT_DXT5                 = $35545844;

type
  TDDSPixelFormat = packed record
    dwSize: Cardinal;
    dwFlags: Cardinal;
    dwFourCC: Cardinal;
    dwRGBBitCount: Cardinal;
    dwRBitMask: Cardinal;
    dwGBitMask: Cardinal;
    dwBBitMask: Cardinal;
    dwABitMask: Cardinal;
  end;

  TDDSCaps = packed record
    dwCaps1: Cardinal;
    dwCaps2: Cardinal;
    dwDDSX: Cardinal;
    dwReserved: Cardinal;
  end;

  TDDSHeader = packed record
    dwSize: Cardinal;
    dwFlags: Cardinal;
    dwHeight: Cardinal;
    dwWidth: Cardinal;
    dwPitchOrLinearSize: Cardinal;
    dwDepth: Cardinal;
    dwMipMapCount: Cardinal;
    dwReserved: array[0..10] of Cardinal;
    PixelFormat: TDDSPixelFormat;
    Caps: TDDSCaps;
    dwReserved2: Cardinal;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.LoadDDS(const aStream: TStream): Boolean;
var
  Header: TDDSHeader;
  Converter: TbmpBitfieldFormat;

  function GetDDSFormat: TglBitmapFormat;
  var
    fd: TFormatDescriptor;
    i: Integer;
    Mask: TglBitmapRec4ul;
    Range: TglBitmapRec4ui;
    match: Boolean;
  begin
    result := tfEmpty;
    with Header.PixelFormat do begin
      // Compresses
      if ((dwFlags and DDPF_FOURCC) > 0) then begin
        case Header.PixelFormat.dwFourCC of
          D3DFMT_DXT1: result := tfS3tcDtx1RGBA;
          D3DFMT_DXT3: result := tfS3tcDtx3RGBA;
          D3DFMT_DXT5: result := tfS3tcDtx5RGBA;
        end;
      end else if ((dwFlags and (DDPF_RGB or DDPF_ALPHAPIXELS or DDPF_LUMINANCE or DDPF_ALPHA)) > 0) then begin
        // prepare masks
        if ((dwFlags and DDPF_LUMINANCE) = 0) then begin
          Mask.r := dwRBitMask;
          Mask.g := dwGBitMask;
          Mask.b := dwBBitMask;
        end else begin
          Mask.r := dwRBitMask;
          Mask.g := dwRBitMask;
          Mask.b := dwRBitMask;
        end;
        if (dwFlags and DDPF_ALPHAPIXELS > 0) then
          Mask.a := dwABitMask
        else
          Mask.a := 0;;

        //find matching format
        fd     := TFormatDescriptor.GetFromMask(Mask, dwRGBBitCount);
        result := fd.Format;
        if (result <> tfEmpty) then
          exit;

        //find format with same Range
        for i := 0 to 3 do
          Range.arr[i] := (2 shl CountSetBits(Mask.arr[i])) - 1;
        for result := High(TglBitmapFormat) downto Low(TglBitmapFormat) do begin
          fd := TFormatDescriptor.Get(result);
          match := true;
          for i := 0 to 3 do
            if (fd.Range.arr[i] <> Range.arr[i]) then begin
              match := false;
              break;
            end;
          if match then
            break;
        end;

        //no format with same range found -> use default
        if (result = tfEmpty) then begin
          if (dwABitMask > 0) then
            result := tfRGBA8ui1
          else
            result := tfRGB8ub3;
        end;

        Converter := TbmpBitfieldFormat.Create;
        Converter.SetCustomValues(dwRGBBitCount, glBitmapRec4ul(dwRBitMask, dwGBitMask, dwBBitMask, dwABitMask));
      end;
    end;
  end;

var
  StreamPos: Int64;
  x, y, LineSize, RowSize, Magic: Cardinal;
  NewImage, TmpData, RowData, SrcData: System.PByte;
  SourceMD, DestMD: Pointer;
  Pixel: TglBitmapPixelData;
  ddsFormat: TglBitmapFormat;
  FormatDesc: TFormatDescriptor;

begin
  result    := false;
  Converter := nil;
  StreamPos := aStream.Position;

  // Magic
  aStream.Read(Magic{%H-}, sizeof(Magic));
  if (Magic <> DDS_MAGIC) then begin
    aStream.Position := StreamPos;
    exit;
  end;

  //Header
  aStream.Read(Header{%H-}, sizeof(Header));
  if (Header.dwSize <> SizeOf(Header)) or
     ((Header.dwFlags and (DDSD_PIXELFORMAT or DDSD_CAPS or DDSD_WIDTH or DDSD_HEIGHT)) <>
        (DDSD_PIXELFORMAT or DDSD_CAPS or DDSD_WIDTH or DDSD_HEIGHT)) then
  begin
    aStream.Position := StreamPos;
    exit;
  end;

  if ((Header.Caps.dwCaps1 and DDSCAPS2_CUBEMAP) > 0) then
    raise EglBitmap.Create('LoadDDS - CubeMaps are not supported');

  ddsFormat := GetDDSFormat;
  try
    if (ddsFormat = tfEmpty) then
      raise EglBitmap.Create('LoadDDS - unsupported Pixelformat found.');

    FormatDesc := TFormatDescriptor.Get(ddsFormat);
    LineSize   := Trunc(Header.dwWidth * FormatDesc.BytesPerPixel);
    GetMem(NewImage, Header.dwHeight * LineSize);
    try
      TmpData := NewImage;

      //Converter needed
      if Assigned(Converter) then begin
        RowSize := Round(Header.dwWidth * Header.PixelFormat.dwRGBBitCount / 8);
        GetMem(RowData, RowSize);
        SourceMD := Converter.CreateMappingData;
        DestMD   := FormatDesc.CreateMappingData;
        try
          for y := 0 to Header.dwHeight-1 do begin
            TmpData := NewImage;
            inc(TmpData, y * LineSize);
            SrcData := RowData;
            aStream.Read(SrcData^, RowSize);
            for x := 0 to Header.dwWidth-1 do begin
              Converter.Unmap(SrcData, Pixel, SourceMD);
              glBitmapConvertPixel(Pixel, Converter, FormatDesc);
              FormatDesc.Map(Pixel, TmpData, DestMD);
            end;
          end;
        finally
          Converter.FreeMappingData(SourceMD);
          FormatDesc.FreeMappingData(DestMD);
          FreeMem(RowData);
        end;
      end else

      // Compressed
      if ((Header.PixelFormat.dwFlags and DDPF_FOURCC) > 0) then begin
        RowSize := Header.dwPitchOrLinearSize div Header.dwWidth;
        for Y := 0 to Header.dwHeight-1 do begin
          aStream.Read(TmpData^, RowSize);
          Inc(TmpData, LineSize);
        end;
      end else

      // Uncompressed
      if (Header.PixelFormat.dwFlags and (DDPF_RGB or DDPF_ALPHAPIXELS or DDPF_LUMINANCE)) > 0 then begin
        RowSize := (Header.PixelFormat.dwRGBBitCount * Header.dwWidth) shr 3;
        for Y := 0 to Header.dwHeight-1 do begin
          aStream.Read(TmpData^, RowSize);
          Inc(TmpData, LineSize);
        end;
      end else
        raise EglBitmap.Create('LoadDDS - unsupported Pixelformat found.');

      SetData(NewImage, ddsFormat, Header.dwWidth, Header.dwHeight);
      result := true;
    except
      if Assigned(NewImage) then
        FreeMem(NewImage);
      raise;
    end;
  finally
    FreeAndNil(Converter);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SaveDDS(const aStream: TStream);
var
  Header: TDDSHeader;
  FormatDesc: TFormatDescriptor;
begin
  if not (ftDDS in FormatGetSupportedFiles(Format)) then
    raise EglBitmapUnsupportedFormat.Create(Format);

  FormatDesc := TFormatDescriptor.Get(Format);

  // Generell
  FillChar(Header{%H-}, SizeOf(Header), 0);
  Header.dwSize  := SizeOf(Header);
  Header.dwFlags := DDSD_WIDTH or DDSD_HEIGHT or DDSD_CAPS or DDSD_PIXELFORMAT;

  Header.dwWidth  := Max(1, Width);
  Header.dwHeight := Max(1, Height);

  // Caps
  Header.Caps.dwCaps1 := DDSCAPS_TEXTURE;

  // Pixelformat
  Header.PixelFormat.dwSize := sizeof(Header);
  if (FormatDesc.IsCompressed) then begin
    Header.PixelFormat.dwFlags := Header.PixelFormat.dwFlags or DDPF_FOURCC;
    case Format of
      tfS3tcDtx1RGBA: Header.PixelFormat.dwFourCC := D3DFMT_DXT1;
      tfS3tcDtx3RGBA: Header.PixelFormat.dwFourCC := D3DFMT_DXT3;
      tfS3tcDtx5RGBA: Header.PixelFormat.dwFourCC := D3DFMT_DXT5;
    end;
  end else if not FormatDesc.HasColor and FormatDesc.HasAlpha then begin
    Header.PixelFormat.dwFlags       := Header.PixelFormat.dwFlags or DDPF_ALPHA;
    Header.PixelFormat.dwRGBBitCount := FormatDesc.BitsPerPixel;
    Header.PixelFormat.dwABitMask    := FormatDesc.Mask.a;
  end else if FormatDesc.IsGrayscale then begin
    Header.PixelFormat.dwFlags       := Header.PixelFormat.dwFlags or DDPF_LUMINANCE;
    Header.PixelFormat.dwRGBBitCount := FormatDesc.BitsPerPixel;
    Header.PixelFormat.dwRBitMask    := FormatDesc.Mask.r;
    Header.PixelFormat.dwABitMask    := FormatDesc.Mask.a;
  end else begin
    Header.PixelFormat.dwFlags := Header.PixelFormat.dwFlags or DDPF_RGB;
    Header.PixelFormat.dwRGBBitCount := FormatDesc.BitsPerPixel;
    Header.PixelFormat.dwRBitMask    := FormatDesc.Mask.r;
    Header.PixelFormat.dwGBitMask    := FormatDesc.Mask.g;
    Header.PixelFormat.dwBBitMask    := FormatDesc.Mask.b;
    Header.PixelFormat.dwABitMask    := FormatDesc.Mask.a;
  end;

  if (FormatDesc.HasAlpha) then
    Header.PixelFormat.dwFlags := Header.PixelFormat.dwFlags or DDPF_ALPHAPIXELS;

  aStream.Write(DDS_MAGIC, sizeof(DDS_MAGIC));
  aStream.Write(Header, SizeOf(Header));
  aStream.Write(Data^, FormatDesc.GetSize(Dimension));
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.FlipHorz: Boolean;
var
  fd: TglBitmapFormatDescriptor;
  Col, RowSize, PixelSize: Integer;
  pTempDest, pDest, pSource: PByte;
begin
  result    := false;
  fd        := FormatDescriptor;
  PixelSize := Ceil(fd.BytesPerPixel);
  RowSize   := fd.GetSize(Width, 1);
  if Assigned(Data) and not fd.IsCompressed then begin
    pSource := Data;
    GetMem(pDest, RowSize);
    try
      pTempDest := pDest;
      Inc(pTempDest, RowSize);
      for Col := 0 to Width-1 do begin
        dec(pTempDest, PixelSize); //dec before, because ptr is behind last byte of data
        Move(pSource^, pTempDest^, PixelSize);
        Inc(pSource, PixelSize);
      end;
      SetData(pDest, Format, Width);
      result := true;
    except
      if Assigned(pDest) then
        FreeMem(pDest);
      raise;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.FlipVert: Boolean;
var
  fd: TglBitmapFormatDescriptor;
  Row, RowSize, PixelSize: Integer;
  TempDestData, DestData, SourceData: PByte;
begin
  result    := false;
  fd        := FormatDescriptor;
  PixelSize := Ceil(fd.BytesPerPixel);
  RowSize   := fd.GetSize(Width, 1);
  if Assigned(Data) then begin
    SourceData := Data;
    GetMem(DestData, Height * RowSize);
    try
      TempDestData := DestData;
      Inc(TempDestData, Width * (Height -1) * PixelSize);
      for Row := 0 to Height -1 do begin
        Move(SourceData^, TempDestData^, RowSize);
        Dec(TempDestData, RowSize);
        Inc(SourceData, RowSize);
      end;
      SetData(DestData, Format, Width, Height);
      result := true;
    except
      if Assigned(DestData) then
        FreeMem(DestData);
      raise;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.LoadFromFile(const aFilename: String);
var
  fs: TFileStream;
begin
  if not FileExists(aFilename) then
    raise EglBitmap.Create('file does not exist: ' + aFilename);
  fs := TFileStream.Create(aFilename, fmOpenRead);
  try
    fs.Position := 0;
    LoadFromStream(fs);
    fFilename := aFilename;
  finally
    fs.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.LoadFromStream(const aStream: TStream);
begin
  {$IFDEF GLB_SUPPORT_PNG_READ}
  if not LoadPNG(aStream) then
  {$ENDIF}
  {$IFDEF GLB_SUPPORT_JPEG_READ}
  if not LoadJPEG(aStream) then
  {$ENDIF}
  if not LoadDDS(aStream) then
  if not LoadTGA(aStream) then
  if not LoadBMP(aStream) then
  if not LoadRAW(aStream) then
    raise EglBitmap.Create('LoadFromStream - Couldn''t load Stream. It''s possible to be an unknow Streamtype.');
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.LoadFromFunc(const aSize: TglBitmapSize; const aFormat: TglBitmapFormat;
  const aFunc: TglBitmapFunction; const aArgs: Pointer);
var
  tmpData: PByte;
  size: Integer;
begin
  size := TFormatDescriptor.Get(aFormat).GetSize(aSize);
  GetMem(tmpData, size);
  try
    FillChar(tmpData^, size, #$FF);
    SetData(tmpData, aFormat, aSize.X, aSize.Y);
  except
    if Assigned(tmpData) then
      FreeMem(tmpData);
    raise;
  end;
  Convert(Self, aFunc, false, aFormat, aArgs);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.LoadFromResource(const aInstance: Cardinal; aResource: String; aResType: PChar);
var
  rs: TResourceStream;
begin
  PrepareResType(aResource, aResType);
  rs := TResourceStream.Create(aInstance, aResource, aResType);
  try
    LoadFromStream(rs);
  finally
    rs.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.LoadFromResourceID(const aInstance: Cardinal; const aResourceID: Integer; const aResType: PChar);
var
  rs: TResourceStream;
begin
  rs := TResourceStream.CreateFromID(aInstance, aResourceID, aResType);
  try
    LoadFromStream(rs);
  finally
    rs.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SaveToFile(const aFilename: String; const aFileType: TglBitmapFileType);
var
  fs: TFileStream;
begin
  fs := TFileStream.Create(aFileName, fmCreate);
  try
    fs.Position := 0;
    SaveToStream(fs, aFileType);
  finally
    fs.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SaveToStream(const aStream: TStream; const aFileType: TglBitmapFileType);
begin
  case aFileType of
    {$IFDEF GLB_SUPPORT_PNG_WRITE}
    ftPNG:  SavePNG(aStream);
    {$ENDIF}
    {$IFDEF GLB_SUPPORT_JPEG_WRITE}
    ftJPEG: SaveJPEG(aStream);
    {$ENDIF}
    ftDDS:  SaveDDS(aStream);
    ftTGA:  SaveTGA(aStream);
    ftBMP:  SaveBMP(aStream);
    ftRAW:  SaveRAW(aStream);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.Convert(const aFunc: TglBitmapFunction; const aCreateTemp: Boolean; const aArgs: Pointer): Boolean;
begin
  result := Convert(Self, aFunc, aCreateTemp, Format, aArgs);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.Convert(const aSource: TglBitmapData; const aFunc: TglBitmapFunction; aCreateTemp: Boolean;
  const aFormat: TglBitmapFormat; const aArgs: Pointer): Boolean;
var
  DestData, TmpData, SourceData: pByte;
  TempHeight, TempWidth: Integer;
  SourceFD, DestFD: TFormatDescriptor;
  SourceMD, DestMD: Pointer;

  FuncRec: TglBitmapFunctionRec;
begin
  Assert(Assigned(Data));
  Assert(Assigned(aSource));
  Assert(Assigned(aSource.Data));

  result := false;
  if Assigned(aSource.Data) and ((aSource.Height > 0) or (aSource.Width > 0)) then begin
    SourceFD := TFormatDescriptor.Get(aSource.Format);
    DestFD   := TFormatDescriptor.Get(aFormat);

    if (SourceFD.IsCompressed) then
      raise EglBitmapUnsupportedFormat.Create('compressed formats are not supported: ', SourceFD.Format);
    if (DestFD.IsCompressed) then
      raise EglBitmapUnsupportedFormat.Create('compressed formats are not supported: ', DestFD.Format);

    // inkompatible Formats so CreateTemp
    if (SourceFD.BitsPerPixel <> DestFD.BitsPerPixel) then
      aCreateTemp := true;

    // Values
    TempHeight := Max(1, aSource.Height);
    TempWidth  := Max(1, aSource.Width);

    FuncRec.Sender := Self;
    FuncRec.Args   := aArgs;

    TmpData := nil;
    if aCreateTemp then begin
      GetMem(TmpData, DestFD.GetSize(TempWidth, TempHeight));
      DestData := TmpData;
    end else
      DestData := Data;

    try
      SourceFD.PreparePixel(FuncRec.Source);
      DestFD.PreparePixel  (FuncRec.Dest);

      SourceMD := SourceFD.CreateMappingData;
      DestMD   := DestFD.CreateMappingData;

      FuncRec.Size            := aSource.Dimension;
      FuncRec.Position.Fields := FuncRec.Size.Fields;

      try
        SourceData := aSource.Data;
        FuncRec.Position.Y := 0;
        while FuncRec.Position.Y < TempHeight do begin
          FuncRec.Position.X := 0;
          while FuncRec.Position.X < TempWidth do begin
            SourceFD.Unmap(SourceData, FuncRec.Source, SourceMD);
            aFunc(FuncRec);
            DestFD.Map(FuncRec.Dest, DestData, DestMD);
            inc(FuncRec.Position.X);
          end;
          inc(FuncRec.Position.Y);
        end;

        // Updating Image or InternalFormat
        if aCreateTemp then
          SetData(TmpData, aFormat, aSource.Width, aSource.Height)
        else if (aFormat <> fFormat) then
          Format := aFormat;

        result := true;
      finally
        SourceFD.FreeMappingData(SourceMD);
        DestFD.FreeMappingData(DestMD);
      end;
    except
      if aCreateTemp and Assigned(TmpData) then
        FreeMem(TmpData);
      raise;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.ConvertTo(const aFormat: TglBitmapFormat): Boolean;
var
  SourceFD, DestFD: TFormatDescriptor;
  SourcePD, DestPD: TglBitmapPixelData;
  ShiftData: TShiftData;

  function DataIsIdentical: Boolean;
  begin
    result := SourceFD.MaskMatch(DestFD.Mask);
  end;

  function CanCopyDirect: Boolean;
  begin
    result :=
      ((SourcePD.Range.r = DestPD.Range.r) or (SourcePD.Range.r = 0) or (DestPD.Range.r = 0)) and
      ((SourcePD.Range.g = DestPD.Range.g) or (SourcePD.Range.g = 0) or (DestPD.Range.g = 0)) and
      ((SourcePD.Range.b = DestPD.Range.b) or (SourcePD.Range.b = 0) or (DestPD.Range.b = 0)) and
      ((SourcePD.Range.a = DestPD.Range.a) or (SourcePD.Range.a = 0) or (DestPD.Range.a = 0));
  end;

  function CanShift: Boolean;
  begin
    result :=
      ((SourcePD.Range.r >= DestPD.Range.r) or (SourcePD.Range.r = 0) or (DestPD.Range.r = 0)) and
      ((SourcePD.Range.g >= DestPD.Range.g) or (SourcePD.Range.g = 0) or (DestPD.Range.g = 0)) and
      ((SourcePD.Range.b >= DestPD.Range.b) or (SourcePD.Range.b = 0) or (DestPD.Range.b = 0)) and
      ((SourcePD.Range.a >= DestPD.Range.a) or (SourcePD.Range.a = 0) or (DestPD.Range.a = 0));
  end;

  function GetShift(aSource, aDest: Cardinal) : ShortInt;
  begin
    result := 0;
    while (aSource > aDest) and (aSource > 0) do begin
      inc(result);
      aSource := aSource shr 1;
    end;
  end;

begin
  if (aFormat <> fFormat) and (aFormat <> tfEmpty) then begin
    SourceFD := TFormatDescriptor.Get(Format);
    DestFD   := TFormatDescriptor.Get(aFormat);

    if DataIsIdentical then begin
      result := true;
      Format := aFormat;
      exit;
    end;

    SourceFD.PreparePixel(SourcePD);
    DestFD.PreparePixel  (DestPD);

    if CanCopyDirect then
      result := Convert(Self, glBitmapConvertCopyFunc, false, aFormat)
    else if CanShift then begin
      ShiftData.r := GetShift(SourcePD.Range.r, DestPD.Range.r);
      ShiftData.g := GetShift(SourcePD.Range.g, DestPD.Range.g);
      ShiftData.b := GetShift(SourcePD.Range.b, DestPD.Range.b);
      ShiftData.a := GetShift(SourcePD.Range.a, DestPD.Range.a);
      result := Convert(Self, glBitmapConvertShiftRGBAFunc, false, aFormat, @ShiftData);
    end else
      result := Convert(Self, glBitmapConvertCalculateRGBAFunc, false, aFormat);
  end else
    result := true;
end;

{$IFDEF GLB_SDL}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignToSurface(out aSurface: PSDL_Surface): Boolean;
var
  Row, RowSize: Integer;
  SourceData, TmpData: PByte;
  TempDepth: Integer;
  FormatDesc: TFormatDescriptor;

  function GetRowPointer(Row: Integer): pByte;
  begin
    result := aSurface.pixels;
    Inc(result, Row * RowSize);
  end;

begin
  result := false;

  FormatDesc := TFormatDescriptor.Get(Format);
  if FormatDesc.IsCompressed then
    raise EglBitmapUnsupportedFormat.Create(Format);

  if Assigned(Data) then begin
    case Trunc(FormatDesc.PixelSize) of
      1: TempDepth :=  8;
      2: TempDepth := 16;
      3: TempDepth := 24;
      4: TempDepth := 32;
    else
      raise EglBitmapUnsupportedFormat.Create(Format);
    end;

    aSurface := SDL_CreateRGBSurface(SDL_SWSURFACE, Width, Height, TempDepth,
      FormatDesc.RedMask, FormatDesc.GreenMask, FormatDesc.BlueMask, FormatDesc.AlphaMask);
    SourceData := Data;
    RowSize    := FormatDesc.GetSize(FileWidth, 1);

    for Row := 0 to FileHeight-1 do begin
      TmpData := GetRowPointer(Row);
      if Assigned(TmpData) then begin
        Move(SourceData^, TmpData^, RowSize);
        inc(SourceData, RowSize);
      end;
    end;
    result := true;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignFromSurface(const aSurface: PSDL_Surface): Boolean;
var
  pSource, pData, pTempData: PByte;
  Row, RowSize, TempWidth, TempHeight: Integer;
  IntFormat: TglBitmapFormat;
  fd: TFormatDescriptor;
  Mask: TglBitmapMask;

  function GetRowPointer(Row: Integer): pByte;
  begin
    result := aSurface^.pixels;
    Inc(result, Row * RowSize);
  end;

begin
  result := false;
  if (Assigned(aSurface)) then begin
    with aSurface^.format^ do begin
      Mask.r := RMask;
      Mask.g := GMask;
      Mask.b := BMask;
      Mask.a := AMask;
      IntFormat := TFormatDescriptor.GetFromMask(Mask).Format;
      if (IntFormat = tfEmpty) then
        raise EglBitmap.Create('AssignFromSurface - Invalid Pixelformat.');
    end;

    fd := TFormatDescriptor.Get(IntFormat);
    TempWidth  := aSurface^.w;
    TempHeight := aSurface^.h;
    RowSize := fd.GetSize(TempWidth, 1);
    GetMem(pData, TempHeight * RowSize);
    try
      pTempData := pData;
      for Row := 0 to TempHeight -1 do begin
        pSource := GetRowPointer(Row);
        if (Assigned(pSource)) then begin
          Move(pSource^, pTempData^, RowSize);
          Inc(pTempData, RowSize);
        end;
      end;
      SetData(pData, IntFormat, TempWidth, TempHeight);
      result := true;
    except
      if Assigned(pData) then
        FreeMem(pData);
      raise;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignAlphaToSurface(out aSurface: PSDL_Surface): Boolean;
var
  Row, Col, AlphaInterleave: Integer;
  pSource, pDest: PByte;

  function GetRowPointer(Row: Integer): pByte;
  begin
    result := aSurface.pixels;
    Inc(result, Row * Width);
  end;

begin
  result := false;
  if Assigned(Data) then begin
    if Format in [tfAlpha8ub1, tfLuminance8Alpha8ub2, tfBGRA8ub4, tfRGBA8ub4] then begin
      aSurface := SDL_CreateRGBSurface(SDL_SWSURFACE, Width, Height, 8, $FF, $FF, $FF, 0);

      AlphaInterleave := 0;
      case Format of
        tfLuminance8Alpha8ub2:
          AlphaInterleave := 1;
        tfBGRA8ub4, tfRGBA8ub4:
          AlphaInterleave := 3;
      end;

      pSource := Data;
      for Row := 0 to Height -1 do begin
        pDest := GetRowPointer(Row);
        if Assigned(pDest) then begin
          for Col := 0 to Width -1 do begin
            Inc(pSource, AlphaInterleave);
            pDest^ := pSource^;
            Inc(pDest);
            Inc(pSource);
          end;
        end;
      end;
      result := true;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromSurface(const aSurface: PSDL_Surface; const aFunc: TglBitmapFunction = nil; const aArgs: Pointer = nil): Boolean;
var
  bmp: TglBitmap2D;
begin
  bmp := TglBitmap2D.Create;
  try
    bmp.AssignFromSurface(aSurface);
    result := AddAlphaFromGlBitmap(bmp, aFunc, aArgs);
  finally
    bmp.Free;
  end;
end;
{$ENDIF}

{$IFDEF GLB_DELPHI}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function CreateGrayPalette: HPALETTE;
var
  Idx: Integer;
  Pal: PLogPalette;
begin
  GetMem(Pal, SizeOf(TLogPalette) + (SizeOf(TPaletteEntry) * 256));

  Pal.palVersion := $300;
  Pal.palNumEntries := 256;

  for Idx := 0 to Pal.palNumEntries - 1 do begin
    Pal.palPalEntry[Idx].peRed   := Idx;
    Pal.palPalEntry[Idx].peGreen := Idx;
    Pal.palPalEntry[Idx].peBlue  := Idx;
    Pal.palPalEntry[Idx].peFlags := 0;
  end;
  Result := CreatePalette(Pal^);
  FreeMem(Pal);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignToBitmap(const aBitmap: TBitmap): Boolean;
var
  Row, RowSize: Integer;
  pSource, pData: PByte;
begin
  result := false;
  if Assigned(Data) then begin
    if Assigned(aBitmap) then begin
      aBitmap.Width  := Width;
      aBitmap.Height := Height;

      case Format of
        tfAlpha8ub1, tfLuminance8ub1: begin
          aBitmap.PixelFormat := pf8bit;
          aBitmap.Palette     := CreateGrayPalette;
        end;
        tfRGB5A1us1:
          aBitmap.PixelFormat := pf15bit;
        tfR5G6B5us1:
          aBitmap.PixelFormat := pf16bit;
        tfRGB8ub3, tfBGR8ub3:
          aBitmap.PixelFormat := pf24bit;
        tfRGBA8ub4, tfBGRA8ub4:
          aBitmap.PixelFormat := pf32bit;
      else
        raise EglBitmap.Create('AssignToBitmap - Invalid Pixelformat.');
      end;

      RowSize := FormatDescriptor.GetSize(Width, 1);
      pSource := Data;
      for Row := 0 to Height-1 do begin
        pData := aBitmap.Scanline[Row];
        Move(pSource^, pData^, RowSize);
        Inc(pSource, RowSize);
        if (Format in [tfRGB8ub3, tfRGBA8ub4]) then        // swap RGB(A) to BGR(A)
          SwapRGB(pData, Width, Format = tfRGBA8ub4);
      end;
      result := true;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignFromBitmap(const aBitmap: TBitmap): Boolean;
var
  pSource, pData, pTempData: PByte;
  Row, RowSize, TempWidth, TempHeight: Integer;
  IntFormat: TglBitmapFormat;
begin
  result := false;

  if (Assigned(aBitmap)) then begin
    case aBitmap.PixelFormat of
      pf8bit:
        IntFormat := tfLuminance8ub1;
      pf15bit:
        IntFormat := tfRGB5A1us1;
      pf16bit:
        IntFormat := tfR5G6B5us1;
      pf24bit:
        IntFormat := tfBGR8ub3;
      pf32bit:
        IntFormat := tfBGRA8ub4;
    else
      raise EglBitmap.Create('AssignFromBitmap - Invalid Pixelformat.');
    end;

    TempWidth  := aBitmap.Width;
    TempHeight := aBitmap.Height;
    RowSize    := TFormatDescriptor.Get(IntFormat).GetSize(TempWidth, 1);
    GetMem(pData, TempHeight * RowSize);
    try
      pTempData := pData;
      for Row := 0 to TempHeight -1 do begin
        pSource := aBitmap.Scanline[Row];
        if (Assigned(pSource)) then begin
          Move(pSource^, pTempData^, RowSize);
          Inc(pTempData, RowSize);
        end;
      end;
      SetData(pData, IntFormat, TempWidth, TempHeight);
      result := true;
    except
      if Assigned(pData) then
        FreeMem(pData);
      raise;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignAlphaToBitmap(const aBitmap: TBitmap): Boolean;
var
  Row, Col, AlphaInterleave: Integer;
  pSource, pDest: PByte;
begin
  result := false;

  if Assigned(Data) then begin
    if (Format in [tfAlpha8ub1, tfLuminance8Alpha8ub2, tfRGBA8ub4, tfBGRA8ub4]) then begin
      if Assigned(aBitmap) then begin
        aBitmap.PixelFormat := pf8bit;
        aBitmap.Palette     := CreateGrayPalette;
        aBitmap.Width       := Width;
        aBitmap.Height      := Height;

        case Format of
          tfLuminance8Alpha8ub2:
            AlphaInterleave := 1;
          tfRGBA8ub4, tfBGRA8ub4:
            AlphaInterleave := 3;
          else
            AlphaInterleave := 0;
        end;

        // Copy Data
        pSource := Data;

        for Row := 0 to Height -1 do begin
          pDest := aBitmap.Scanline[Row];
          if Assigned(pDest) then begin
            for Col := 0 to Width -1 do begin
              Inc(pSource, AlphaInterleave);
              pDest^ := pSource^;
              Inc(pDest);
              Inc(pSource);
            end;
          end;
        end;
        result := true;
      end;
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromBitmap(const aBitmap: TBitmap; const aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;
var
  data: TglBitmapData;
begin
  data := TglBitmapData.Create;
  try
    data.AssignFromBitmap(aBitmap);
    result := AddAlphaFromDataObj(data, aFunc, aArgs);
  finally
    data.Free;
  end;
end;
{$ENDIF}

{$IFDEF GLB_LAZARUS}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignToLazIntfImage(const aImage: TLazIntfImage): Boolean;
var
  rid: TRawImageDescription;
  FormatDesc: TFormatDescriptor;
begin
  if not Assigned(Data) then
    raise EglBitmap.Create('no pixel data assigned. load data before save');

  result := false;
  if not Assigned(aImage) or (Format = tfEmpty) then
    exit;
  FormatDesc := TFormatDescriptor.Get(Format);
  if FormatDesc.IsCompressed then
    exit;

  FillChar(rid{%H-}, SizeOf(rid), 0);
  if FormatDesc.IsGrayscale then
    rid.Format := ricfGray
  else
    rid.Format := ricfRGBA;

  rid.Width        := Width;
  rid.Height       := Height;
  rid.Depth        := FormatDesc.BitsPerPixel;
  rid.BitOrder     := riboBitsInOrder;
  rid.ByteOrder    := riboLSBFirst;
  rid.LineOrder    := riloTopToBottom;
  rid.LineEnd      := rileTight;
  rid.BitsPerPixel := FormatDesc.BitsPerPixel;
  rid.RedPrec      := CountSetBits(FormatDesc.Range.r);
  rid.GreenPrec    := CountSetBits(FormatDesc.Range.g);
  rid.BluePrec     := CountSetBits(FormatDesc.Range.b);
  rid.AlphaPrec    := CountSetBits(FormatDesc.Range.a);
  rid.RedShift     := FormatDesc.Shift.r;
  rid.GreenShift   := FormatDesc.Shift.g;
  rid.BlueShift    := FormatDesc.Shift.b;
  rid.AlphaShift   := FormatDesc.Shift.a;

  rid.MaskBitsPerPixel  := 0;
  rid.PaletteColorCount := 0;

  aImage.DataDescription := rid;
  aImage.CreateData;

  if not Assigned(aImage.PixelData) then
    raise EglBitmap.Create('error while creating LazIntfImage');
  Move(Data^, aImage.PixelData^, FormatDesc.GetSize(Dimension));

  result := true;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignFromLazIntfImage(const aImage: TLazIntfImage): Boolean;
var
  f: TglBitmapFormat;
  FormatDesc: TFormatDescriptor;
  ImageData: PByte;
  ImageSize: Integer;
  CanCopy: Boolean;
  Mask: TglBitmapRec4ul;

  procedure CopyConvert;
  var
    bfFormat: TbmpBitfieldFormat;
    pSourceLine, pDestLine: PByte;
    pSourceMD, pDestMD: Pointer;
    Shift, Prec: TglBitmapRec4ub;
    x, y: Integer;
    pixel: TglBitmapPixelData;
  begin
    bfFormat  := TbmpBitfieldFormat.Create;
    with aImage.DataDescription do begin
      Prec.r := RedPrec;
      Prec.g := GreenPrec;
      Prec.b := BluePrec;
      Prec.a := AlphaPrec;
      Shift.r := RedShift;
      Shift.g := GreenShift;
      Shift.b := BlueShift;
      Shift.a := AlphaShift;
      bfFormat.SetCustomValues(BitsPerPixel, Prec, Shift);
    end;
    pSourceMD := bfFormat.CreateMappingData;
    pDestMD   := FormatDesc.CreateMappingData;
    try
      for y := 0 to aImage.Height-1 do begin
        pSourceLine := aImage.PixelData + y {%H-}* aImage.DataDescription.BytesPerLine;
        pDestLine   := ImageData        + y * Round(FormatDesc.BytesPerPixel * aImage.Width);
        for x := 0 to aImage.Width-1 do begin
          bfFormat.Unmap(pSourceLine, pixel, pSourceMD);
          FormatDesc.Map(pixel, pDestLine, pDestMD);
        end;
      end;
    finally
      FormatDesc.FreeMappingData(pDestMD);
      bfFormat.FreeMappingData(pSourceMD);
      bfFormat.Free;
    end;
  end;

begin
  result := false;
  if not Assigned(aImage) then
    exit;

  with aImage.DataDescription do begin
    Mask.r := (QWord(1 shl RedPrec  )-1) shl RedShift;
    Mask.g := (QWord(1 shl GreenPrec)-1) shl GreenShift;
    Mask.b := (QWord(1 shl BluePrec )-1) shl BlueShift;
    Mask.a := (QWord(1 shl AlphaPrec)-1) shl AlphaShift;
  end;
  FormatDesc := TFormatDescriptor.GetFromMask(Mask);
  f          := FormatDesc.Format;
  if (f = tfEmpty) then
    exit;

  CanCopy :=
    (FormatDesc.BitsPerPixel             = aImage.DataDescription.Depth) and
    (aImage.DataDescription.BitsPerPixel = aImage.DataDescription.Depth);

  ImageSize := FormatDesc.GetSize(aImage.Width, aImage.Height);
  ImageData := GetMem(ImageSize);
  try
    if CanCopy then
      Move(aImage.PixelData^, ImageData^, ImageSize)
    else
      CopyConvert;
    SetData(ImageData, f, aImage.Width, aImage.Height);
  except
    if Assigned(ImageData) then
      FreeMem(ImageData);
    raise;
  end;

  result := true;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AssignAlphaToLazIntfImage(const aImage: TLazIntfImage): Boolean;
var
  rid: TRawImageDescription;
  FormatDesc: TFormatDescriptor;
  Pixel: TglBitmapPixelData;
  x, y: Integer;
  srcMD: Pointer;
  src, dst: PByte;
begin
  result := false;
  if not Assigned(aImage) or (Format = tfEmpty) then
    exit;
  FormatDesc := TFormatDescriptor.Get(Format);
  if FormatDesc.IsCompressed or not FormatDesc.HasAlpha then
    exit;

  FillChar(rid{%H-}, SizeOf(rid), 0);
  rid.Format       := ricfGray;
  rid.Width        := Width;
  rid.Height       := Height;
  rid.Depth        := CountSetBits(FormatDesc.Range.a);
  rid.BitOrder     := riboBitsInOrder;
  rid.ByteOrder    := riboLSBFirst;
  rid.LineOrder    := riloTopToBottom;
  rid.LineEnd      := rileTight;
  rid.BitsPerPixel := 8 * Ceil(rid.Depth / 8);
  rid.RedPrec      := CountSetBits(FormatDesc.Range.a);
  rid.GreenPrec    := 0;
  rid.BluePrec     := 0;
  rid.AlphaPrec    := 0;
  rid.RedShift     := 0;
  rid.GreenShift   := 0;
  rid.BlueShift    := 0;
  rid.AlphaShift   := 0;

  rid.MaskBitsPerPixel  := 0;
  rid.PaletteColorCount := 0;

  aImage.DataDescription := rid;
  aImage.CreateData;

  srcMD := FormatDesc.CreateMappingData;
  try
    FormatDesc.PreparePixel(Pixel);
    src := Data;
    dst := aImage.PixelData;
    for y := 0 to Height-1 do
      for x := 0 to Width-1 do begin
        FormatDesc.Unmap(src, Pixel, srcMD);
        case rid.BitsPerPixel of
           8: begin
            dst^ := Pixel.Data.a;
            inc(dst);
          end;
          16: begin
            PWord(dst)^ := Pixel.Data.a;
            inc(dst, 2);
          end;
          24: begin
            PByteArray(dst)^[0] := PByteArray(@Pixel.Data.a)^[0];
            PByteArray(dst)^[1] := PByteArray(@Pixel.Data.a)^[1];
            PByteArray(dst)^[2] := PByteArray(@Pixel.Data.a)^[2];
            inc(dst, 3);
          end;
          32: begin
            PCardinal(dst)^ := Pixel.Data.a;
            inc(dst, 4);
          end;
        else
          raise EglBitmapUnsupportedFormat.Create(Format);
        end;
      end;
  finally
    FormatDesc.FreeMappingData(srcMD);
  end;
  result := true;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromLazIntfImage(const aImage: TLazIntfImage; const aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;
var
  data: TglBitmapData;
begin
  data := TglBitmapData.Create;
  try
    data.AssignFromLazIntfImage(aImage);
    result := AddAlphaFromDataObj(data, aFunc, aArgs);
  finally
    data.Free;
  end;
end;
{$ENDIF}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromResource(const aInstance: Cardinal; aResource: String; aResType: PChar;
  const aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;
var
  rs: TResourceStream;
begin
  PrepareResType(aResource, aResType);
  rs := TResourceStream.Create(aInstance, aResource, aResType);
  try
    result := AddAlphaFromStream(rs, aFunc, aArgs);
  finally
    rs.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromResourceID(const aInstance: Cardinal; const aResourceID: Integer; const aResType: PChar;
  const aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;
var
  rs: TResourceStream;
begin
  rs := TResourceStream.CreateFromID(aInstance, aResourceID, aResType);
  try
    result := AddAlphaFromStream(rs, aFunc, aArgs);
  finally
    rs.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromFunc(const aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;
begin
  if TFormatDescriptor.Get(Format).IsCompressed then
    raise EglBitmapUnsupportedFormat.Create(Format);
  result := Convert(Self, aFunc, false, TFormatDescriptor.Get(Format).WithAlpha, aArgs);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromFile(const aFileName: String; const aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;
var
  FS: TFileStream;
begin
  FS := TFileStream.Create(aFileName, fmOpenRead);
  try
    result := AddAlphaFromStream(FS, aFunc, aArgs);
  finally
    FS.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromStream(const aStream: TStream; const aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;
var
  data: TglBitmapData;
begin
  data := TglBitmapData.Create(aStream);
  try
    result := AddAlphaFromDataObj(data, aFunc, aArgs);
  finally
    data.Free;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromDataObj(const aDataObj: TglBitmapData; aFunc: TglBitmapFunction; const aArgs: Pointer): Boolean;
var
  DestData, DestData2, SourceData: pByte;
  TempHeight, TempWidth: Integer;
  SourceFD, DestFD: TFormatDescriptor;
  SourceMD, DestMD, DestMD2: Pointer;

  FuncRec: TglBitmapFunctionRec;
begin
  result := false;

  Assert(Assigned(Data));
  Assert(Assigned(aDataObj));
  Assert(Assigned(aDataObj.Data));

  if ((aDataObj.Width = Width) and (aDataObj.Height = Height)) then begin
    result := ConvertTo(TFormatDescriptor.Get(Format).WithAlpha);

    SourceFD := TFormatDescriptor.Get(aDataObj.Format);
    DestFD   := TFormatDescriptor.Get(Format);

    if not Assigned(aFunc) then begin
      aFunc        := glBitmapAlphaFunc;
      FuncRec.Args := {%H-}Pointer(SourceFD.HasAlpha);
    end else
      FuncRec.Args := aArgs;

    // Values
    TempWidth  := aDataObj.Width;
    TempHeight := aDataObj.Height;
    if (TempWidth <= 0) or (TempHeight <= 0) then
      exit;

    FuncRec.Sender          := Self;
    FuncRec.Size            := Dimension;
    FuncRec.Position.Fields := FuncRec.Size.Fields;

    DestData   := Data;
    DestData2  := Data;
    SourceData := aDataObj.Data;

    // Mapping
    SourceFD.PreparePixel(FuncRec.Source);
    DestFD.PreparePixel  (FuncRec.Dest);

    SourceMD := SourceFD.CreateMappingData;
    DestMD   := DestFD.CreateMappingData;
    DestMD2  := DestFD.CreateMappingData;
    try
      FuncRec.Position.Y := 0;
      while FuncRec.Position.Y < TempHeight do begin
        FuncRec.Position.X := 0;
        while FuncRec.Position.X < TempWidth do begin
          SourceFD.Unmap(SourceData, FuncRec.Source, SourceMD);
          DestFD.Unmap  (DestData,   FuncRec.Dest,   DestMD);
          aFunc(FuncRec);
          DestFD.Map(FuncRec.Dest, DestData2, DestMD2);
          inc(FuncRec.Position.X);
        end;
        inc(FuncRec.Position.Y);
      end;
    finally
      SourceFD.FreeMappingData(SourceMD);
      DestFD.FreeMappingData(DestMD);
      DestFD.FreeMappingData(DestMD2);
    end;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromColorKey(const aRed, aGreen, aBlue: Byte; const aDeviation: Byte): Boolean;
begin
  result := AddAlphaFromColorKeyFloat(aRed / $FF, aGreen / $FF, aBlue / $FF, aDeviation / $FF);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromColorKeyRange(const aRed, aGreen, aBlue: Cardinal; const aDeviation: Cardinal): Boolean;
var
  PixelData: TglBitmapPixelData;
begin
  TFormatDescriptor.GetAlpha(Format).PreparePixel(PixelData);
  result := AddAlphaFromColorKeyFloat(
    aRed   / PixelData.Range.r,
    aGreen / PixelData.Range.g,
    aBlue  / PixelData.Range.b,
    aDeviation / Max(PixelData.Range.r, Max(PixelData.Range.g, PixelData.Range.b)));
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromColorKeyFloat(const aRed, aGreen, aBlue: Single; const aDeviation: Single): Boolean;
var
  values: array[0..2] of Single;
  tmp: Cardinal;
  i: Integer;
  PixelData: TglBitmapPixelData;
begin
  TFormatDescriptor.GetAlpha(Format).PreparePixel(PixelData);
  with PixelData do begin
    values[0] := aRed;
    values[1] := aGreen;
    values[2] := aBlue;

    for i := 0 to 2 do begin
      tmp          := Trunc(Range.arr[i] * aDeviation);
      Data.arr[i]  := Min(Range.arr[i], Trunc(Range.arr[i] * values[i] + tmp));
      Range.arr[i] := Max(0,            Trunc(Range.arr[i] * values[i] - tmp));
    end;
    Data.a  := 0;
    Range.a := 0;
  end;
  result := AddAlphaFromFunc(glBitmapColorKeyAlphaFunc, @PixelData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromValue(const aAlpha: Byte): Boolean;
begin
  result := AddAlphaFromValueFloat(aAlpha / $FF);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromValueRange(const aAlpha: Cardinal): Boolean;
var
  PixelData: TglBitmapPixelData;
begin
  TFormatDescriptor.GetAlpha(Format).PreparePixel(PixelData);
  result := AddAlphaFromValueFloat(aAlpha / PixelData.Range.a);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.AddAlphaFromValueFloat(const aAlpha: Single): Boolean;
var
  PixelData: TglBitmapPixelData;
begin
  TFormatDescriptor.GetAlpha(Format).PreparePixel(PixelData);
  with PixelData do
    Data.a := Min(Range.a, Max(0, Round(Range.a * aAlpha)));
  result := AddAlphaFromFunc(glBitmapValueAlphaFunc, @PixelData.Data.a);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.RemoveAlpha: Boolean;
var
  FormatDesc: TFormatDescriptor;
begin
  result := false;
  FormatDesc := TFormatDescriptor.Get(Format);
  if Assigned(Data) then begin
    if FormatDesc.IsCompressed or not FormatDesc.HasAlpha then
      raise EglBitmapUnsupportedFormat.Create(Format);
    result := ConvertTo(FormatDesc.WithoutAlpha);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.FillWithColor(const aRed, aGreen, aBlue: Byte;
  const aAlpha: Byte);
begin
  FillWithColorFloat(aRed/$FF, aGreen/$FF, aBlue/$FF, aAlpha/$FF);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.FillWithColorRange(const aRed, aGreen, aBlue: Cardinal; const aAlpha: Cardinal);
var
  PixelData: TglBitmapPixelData;
begin
  TFormatDescriptor.GetAlpha(Format).PreparePixel(PixelData);
  FillWithColorFloat(
    aRed   / PixelData.Range.r,
    aGreen / PixelData.Range.g,
    aBlue  / PixelData.Range.b,
    aAlpha / PixelData.Range.a);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.FillWithColorFloat(const aRed, aGreen, aBlue: Single; const aAlpha: Single);
var
  PixelData: TglBitmapPixelData;
begin
  TFormatDescriptor.Get(Format).PreparePixel(PixelData);
  with PixelData do begin
    Data.r := Max(0, Min(Range.r, Trunc(Range.r * aRed)));
    Data.g := Max(0, Min(Range.g, Trunc(Range.g * aGreen)));
    Data.b := Max(0, Min(Range.b, Trunc(Range.b * aBlue)));
    Data.a := Max(0, Min(Range.a, Trunc(Range.a * aAlpha)));
  end;
  Convert(glBitmapFillWithColorFunc, false, @PixelData);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.SetData(const aData: PByte; const aFormat: TglBitmapFormat; const aWidth: Integer; const aHeight: Integer);
begin
  if (Data <> aData) then begin
    if (Assigned(Data)) then
      FreeMem(Data);
    fData := aData;
  end;

  if Assigned(fData) then begin
    FillChar(fDimension, SizeOf(fDimension), 0);
    if aWidth <> -1 then begin
      fDimension.Fields := fDimension.Fields + [ffX];
      fDimension.X := aWidth;
    end;

    if aHeight <> -1 then begin
      fDimension.Fields := fDimension.Fields + [ffY];
      fDimension.Y := aHeight;
    end;

    fFormat := aFormat;
  end else
    fFormat := tfEmpty;

  UpdateScanlines;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmapData.Clone: TglBitmapData;
var
  Temp: TglBitmapData;
  TempPtr: PByte;
  Size: Integer;
begin
  result := nil;
  Temp := (ClassType.Create as TglBitmapData);
  try
    // copy texture data if assigned
    if Assigned(Data) then begin
      Size := TFormatDescriptor.Get(Format).GetSize(fDimension);
      GetMem(TempPtr, Size);
      try
        Move(Data^, TempPtr^, Size);
        Temp.SetData(TempPtr, Format, Width, Height);
      except
        if Assigned(TempPtr) then
          FreeMem(TempPtr);
        raise;
      end;
    end else begin
      TempPtr := nil;
      Temp.SetData(TempPtr, Format, Width, Height);
    end;

	  // copy properties
    Temp.fFormat := Format;
    result := Temp;
  except
    FreeAndNil(Temp);
    raise;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.Invert(const aRed, aGreen, aBlue, aAlpha: Boolean);
var
  mask: PtrInt;
begin
  mask :=
     (Byte(aRed)   and 1)        or
    ((Byte(aGreen) and 1) shl 1) or
    ((Byte(aBlue)  and 1) shl 2) or
    ((Byte(aAlpha) and 1) shl 3);
  if (mask > 0) then
    Convert(glBitmapInvertFunc, false, {%H-}Pointer(mask));
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
type
  TMatrixItem = record
    X, Y: Integer;
    W: Single;
  end;

  PglBitmapToNormalMapRec = ^TglBitmapToNormalMapRec;
  TglBitmapToNormalMapRec = Record
    Scale: Single;
    Heights: array of Single;
    MatrixU : array of TMatrixItem;
    MatrixV : array of TMatrixItem;
  end;

const
  ONE_OVER_255 = 1 / 255;

  //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapToNormalMapPrepareFunc(var FuncRec: TglBitmapFunctionRec);
var
  Val: Single;
begin
  with FuncRec do begin
    Val :=
      Source.Data.r * LUMINANCE_WEIGHT_R +
      Source.Data.g * LUMINANCE_WEIGHT_G +
      Source.Data.b * LUMINANCE_WEIGHT_B;
    PglBitmapToNormalMapRec(Args)^.Heights[Position.Y * Size.X + Position.X] := Val * ONE_OVER_255;
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapToNormalMapPrepareAlphaFunc(var FuncRec: TglBitmapFunctionRec);
begin
  with FuncRec do
    PglBitmapToNormalMapRec(Args)^.Heights[Position.Y * Size.X + Position.X] := Source.Data.a * ONE_OVER_255;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapToNormalMapFunc (var FuncRec: TglBitmapFunctionRec);
type
  TVec = Array[0..2] of Single;
var
  Idx: Integer;
  du, dv: Double;
  Len: Single;
  Vec: TVec;

  function GetHeight(X, Y: Integer): Single;
  begin
    with FuncRec do begin
      X := Max(0, Min(Size.X -1, X));
      Y := Max(0, Min(Size.Y -1, Y));
      result := PglBitmapToNormalMapRec(Args)^.Heights[Y * Size.X + X];
    end;
  end;

begin
  with FuncRec do begin
    with PglBitmapToNormalMapRec(Args)^ do begin
      du := 0;
      for Idx := Low(MatrixU) to High(MatrixU) do
        du := du + GetHeight(Position.X + MatrixU[Idx].X, Position.Y + MatrixU[Idx].Y) * MatrixU[Idx].W;

      dv := 0;
      for Idx := Low(MatrixU) to High(MatrixU) do
        dv := dv + GetHeight(Position.X + MatrixV[Idx].X, Position.Y + MatrixV[Idx].Y) * MatrixV[Idx].W;

      Vec[0] := -du * Scale;
      Vec[1] := -dv * Scale;
      Vec[2] := 1;
    end;

    // Normalize
    Len := 1 / Sqrt(Sqr(Vec[0]) + Sqr(Vec[1]) + Sqr(Vec[2]));
    if Len <> 0 then begin
      Vec[0] := Vec[0] * Len;
      Vec[1] := Vec[1] * Len;
      Vec[2] := Vec[2] * Len;
    end;

    // Farbe zuweisem
    Dest.Data.r := Trunc((Vec[0] + 1) * 127.5);
    Dest.Data.g := Trunc((Vec[1] + 1) * 127.5);
    Dest.Data.b := Trunc((Vec[2] + 1) * 127.5);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapData.GenerateNormalMap(const aFunc: TglBitmapNormalMapFunc; const aScale: Single; const aUseAlpha: Boolean);
var
  Rec: TglBitmapToNormalMapRec;

  procedure SetEntry (var Matrix: array of TMatrixItem; Index, X, Y: Integer; W: Single);
  begin
    if (Index >= Low(Matrix)) and (Index <= High(Matrix)) then begin
      Matrix[Index].X := X;
      Matrix[Index].Y := Y;
      Matrix[Index].W := W;
    end;
  end;

begin
  if TFormatDescriptor.Get(Format).IsCompressed then
    raise EglBitmapUnsupportedFormat.Create(Format);

  if aScale > 100 then
    Rec.Scale := 100
  else if aScale < -100 then
    Rec.Scale := -100
  else
    Rec.Scale := aScale;

  SetLength(Rec.Heights, Width * Height);
  try
    case aFunc of
      nm4Samples: begin
        SetLength(Rec.MatrixU, 2);
        SetEntry(Rec.MatrixU, 0, -1,  0, -0.5);
        SetEntry(Rec.MatrixU, 1,  1,  0,  0.5);

        SetLength(Rec.MatrixV, 2);
        SetEntry(Rec.MatrixV, 0,  0,  1,  0.5);
        SetEntry(Rec.MatrixV, 1,  0, -1, -0.5);
      end;

      nmSobel: begin
        SetLength(Rec.MatrixU, 6);
        SetEntry(Rec.MatrixU, 0, -1,  1, -1.0);
        SetEntry(Rec.MatrixU, 1, -1,  0, -2.0);
        SetEntry(Rec.MatrixU, 2, -1, -1, -1.0);
        SetEntry(Rec.MatrixU, 3,  1,  1,  1.0);
        SetEntry(Rec.MatrixU, 4,  1,  0,  2.0);
        SetEntry(Rec.MatrixU, 5,  1, -1,  1.0);

        SetLength(Rec.MatrixV, 6);
        SetEntry(Rec.MatrixV, 0, -1,  1,  1.0);
        SetEntry(Rec.MatrixV, 1,  0,  1,  2.0);
        SetEntry(Rec.MatrixV, 2,  1,  1,  1.0);
        SetEntry(Rec.MatrixV, 3, -1, -1, -1.0);
        SetEntry(Rec.MatrixV, 4,  0, -1, -2.0);
        SetEntry(Rec.MatrixV, 5,  1, -1, -1.0);
      end;

      nm3x3: begin
        SetLength(Rec.MatrixU, 6);
        SetEntry(Rec.MatrixU, 0, -1,  1, -1/6);
        SetEntry(Rec.MatrixU, 1, -1,  0, -1/6);
        SetEntry(Rec.MatrixU, 2, -1, -1, -1/6);
        SetEntry(Rec.MatrixU, 3,  1,  1,  1/6);
        SetEntry(Rec.MatrixU, 4,  1,  0,  1/6);
        SetEntry(Rec.MatrixU, 5,  1, -1,  1/6);

        SetLength(Rec.MatrixV, 6);
        SetEntry(Rec.MatrixV, 0, -1,  1,  1/6);
        SetEntry(Rec.MatrixV, 1,  0,  1,  1/6);
        SetEntry(Rec.MatrixV, 2,  1,  1,  1/6);
        SetEntry(Rec.MatrixV, 3, -1, -1, -1/6);
        SetEntry(Rec.MatrixV, 4,  0, -1, -1/6);
        SetEntry(Rec.MatrixV, 5,  1, -1, -1/6);
      end;

      nm5x5: begin
        SetLength(Rec.MatrixU, 20);
        SetEntry(Rec.MatrixU,  0, -2,  2, -1 / 16);
        SetEntry(Rec.MatrixU,  1, -1,  2, -1 / 10);
        SetEntry(Rec.MatrixU,  2,  1,  2,  1 / 10);
        SetEntry(Rec.MatrixU,  3,  2,  2,  1 / 16);
        SetEntry(Rec.MatrixU,  4, -2,  1, -1 / 10);
        SetEntry(Rec.MatrixU,  5, -1,  1, -1 /  8);
        SetEntry(Rec.MatrixU,  6,  1,  1,  1 /  8);
        SetEntry(Rec.MatrixU,  7,  2,  1,  1 / 10);
        SetEntry(Rec.MatrixU,  8, -2,  0, -1 / 2.8);
        SetEntry(Rec.MatrixU,  9, -1,  0, -0.5);
        SetEntry(Rec.MatrixU, 10,  1,  0,  0.5);
        SetEntry(Rec.MatrixU, 11,  2,  0,  1 / 2.8);
        SetEntry(Rec.MatrixU, 12, -2, -1, -1 / 10);
        SetEntry(Rec.MatrixU, 13, -1, -1, -1 /  8);
        SetEntry(Rec.MatrixU, 14,  1, -1,  1 /  8);
        SetEntry(Rec.MatrixU, 15,  2, -1,  1 / 10);
        SetEntry(Rec.MatrixU, 16, -2, -2, -1 / 16);
        SetEntry(Rec.MatrixU, 17, -1, -2, -1 / 10);
        SetEntry(Rec.MatrixU, 18,  1, -2,  1 / 10);
        SetEntry(Rec.MatrixU, 19,  2, -2,  1 / 16);

        SetLength(Rec.MatrixV, 20);
        SetEntry(Rec.MatrixV,  0, -2,  2,  1 / 16);
        SetEntry(Rec.MatrixV,  1, -1,  2,  1 / 10);
        SetEntry(Rec.MatrixV,  2,  0,  2,  0.25);
        SetEntry(Rec.MatrixV,  3,  1,  2,  1 / 10);
        SetEntry(Rec.MatrixV,  4,  2,  2,  1 / 16);
        SetEntry(Rec.MatrixV,  5, -2,  1,  1 / 10);
        SetEntry(Rec.MatrixV,  6, -1,  1,  1 /  8);
        SetEntry(Rec.MatrixV,  7,  0,  1,  0.5);
        SetEntry(Rec.MatrixV,  8,  1,  1,  1 /  8);
        SetEntry(Rec.MatrixV,  9,  2,  1,  1 / 16);
        SetEntry(Rec.MatrixV, 10, -2, -1, -1 / 16);
        SetEntry(Rec.MatrixV, 11, -1, -1, -1 /  8);
        SetEntry(Rec.MatrixV, 12,  0, -1, -0.5);
        SetEntry(Rec.MatrixV, 13,  1, -1, -1 /  8);
        SetEntry(Rec.MatrixV, 14,  2, -1, -1 / 10);
        SetEntry(Rec.MatrixV, 15, -2, -2, -1 / 16);
        SetEntry(Rec.MatrixV, 16, -1, -2, -1 / 10);
        SetEntry(Rec.MatrixV, 17,  0, -2, -0.25);
        SetEntry(Rec.MatrixV, 18,  1, -2, -1 / 10);
        SetEntry(Rec.MatrixV, 19,  2, -2, -1 / 16);
      end;
    end;

    // Daten Sammeln
    if aUseAlpha and TFormatDescriptor.Get(Format).HasAlpha then
      Convert(glBitmapToNormalMapPrepareAlphaFunc, false, @Rec)
    else
      Convert(glBitmapToNormalMapPrepareFunc, false, @Rec);
    Convert(glBitmapToNormalMapFunc, false, @Rec);
  finally
    SetLength(Rec.Heights, 0);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmapData.Create;
begin
  inherited Create;
  fFormat := glBitmapDefaultFormat;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmapData.Create(const aFileName: String);
begin
  Create;
  LoadFromFile(aFileName);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmapData.Create(const aStream: TStream);
begin
  Create;
  LoadFromStream(aStream);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmapData.Create(const aSize: TglBitmapSize; const aFormat: TglBitmapFormat; aData: PByte);
var
  ImageSize: Integer;
begin
  Create;
  if not Assigned(aData) then begin
    ImageSize := TFormatDescriptor.Get(aFormat).GetSize(aSize);
    GetMem(aData, ImageSize);
    try
      FillChar(aData^, ImageSize, #$FF);
      SetData(aData, aFormat, aSize.X, aSize.Y);
    except
      if Assigned(aData) then
        FreeMem(aData);
      raise;
    end;
  end else begin
    SetData(aData, aFormat, aSize.X, aSize.Y);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmapData.Create(const aSize: TglBitmapSize; const aFormat: TglBitmapFormat; const aFunc: TglBitmapFunction; const aArgs: Pointer);
begin
  Create;
  LoadFromFunc(aSize, aFormat, aFunc, aArgs);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmapData.Create(const aInstance: Cardinal; const aResource: String; const aResType: PChar);
begin
  Create;
  LoadFromResource(aInstance, aResource, aResType);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmapData.Create(const aInstance: Cardinal; const aResourceID: Integer; const aResType: PChar);
begin
  Create;
  LoadFromResourceID(aInstance, aResourceID, aResType);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
destructor TglBitmapData.Destroy;
begin
  SetData(nil, tfEmpty);
  inherited Destroy;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmap - PROTECTED///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmap.GetWidth: Integer;
begin
  if (ffX in fDimension.Fields) then
    result := fDimension.X
  else
    result := -1;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmap.GetHeight: Integer;
begin
  if (ffY in fDimension.Fields) then
    result := fDimension.Y
  else
    result := -1;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetCustomData(const aValue: Pointer);
begin
  if fCustomData = aValue then
    exit;
  fCustomData := aValue;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetCustomName(const aValue: String);
begin
  if fCustomName = aValue then
    exit;
  fCustomName := aValue;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetCustomNameW(const aValue: WideString);
begin
  if fCustomNameW = aValue then
    exit;
  fCustomNameW := aValue;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetDeleteTextureOnFree(const aValue: Boolean);
begin
  if fDeleteTextureOnFree = aValue then
    exit;
  fDeleteTextureOnFree := aValue;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetID(const aValue: Cardinal);
begin
  if fID = aValue then
    exit;
  fID := aValue;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetMipMap(const aValue: TglBitmapMipMap);
begin
  if fMipMap = aValue then
    exit;
  fMipMap := aValue;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetTarget(const aValue: Cardinal);
begin
  if fTarget = aValue then
    exit;
  fTarget := aValue;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetAnisotropic(const aValue: Integer);
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_EXT)}
var
  MaxAnisotropic: Integer;
{$IFEND}
begin
  fAnisotropic := aValue;
  if (ID > 0) then begin
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_EXT)}
    if GL_EXT_texture_filter_anisotropic then begin
      if fAnisotropic > 0 then begin
        Bind(false);
        glGetIntegerv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, @MaxAnisotropic);
        if aValue > MaxAnisotropic then
          fAnisotropic := MaxAnisotropic;
        glTexParameteri(Target, GL_TEXTURE_MAX_ANISOTROPY_EXT, fAnisotropic);
      end;
    end else begin
      fAnisotropic := 0;
    end;
{$ELSE}
    fAnisotropic := 0;
{$IFEND}
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.CreateID;
begin
  if (ID <> 0) then
    glDeleteTextures(1, @fID);
  glGenTextures(1, @fID);
  Bind(false);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetupParameters({$IFNDEF OPENGL_ES}out aBuildWithGlu: Boolean{$ENDIF});
begin
  // Set Up Parameters
  SetWrap(fWrapS, fWrapT, fWrapR);
  SetFilter(fFilterMin, fFilterMag);
  SetAnisotropic(fAnisotropic);

{$IFNDEF OPENGL_ES}
  SetBorderColor(fBorderColor[0], fBorderColor[1], fBorderColor[2], fBorderColor[3]);
  if (GL_ARB_texture_swizzle or GL_EXT_texture_swizzle or GL_VERSION_3_3) then
    SetSwizzle(fSwizzle[0], fSwizzle[1], fSwizzle[2], fSwizzle[3]);
{$ENDIF}

{$IFNDEF OPENGL_ES}
  // Mip Maps Generation Mode
  aBuildWithGlu := false;
  if (MipMap = mmMipmap) then begin
    if (GL_VERSION_1_4 or GL_SGIS_generate_mipmap) then
      glTexParameteri(Target, GL_GENERATE_MIPMAP, GL_TRUE)
    else
      aBuildWithGlu := true;
  end else if (MipMap = mmMipmapGlu) then
    aBuildWithGlu := true;
{$ELSE}
  if (MipMap = mmMipmap) then
    glTexParameteri(Target, GL_GENERATE_MIPMAP, GL_TRUE);
{$ENDIF}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmap - PUBLIC//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.AfterConstruction;
begin
  inherited AfterConstruction;

  fID         := 0;
  fTarget     := 0;
{$IFNDEF OPENGL_ES}
  fIsResident := false;
{$ENDIF}

  fMipMap              := glBitmapDefaultMipmap;
  fDeleteTextureOnFree := glBitmapGetDefaultDeleteTextureOnFree;

  glBitmapGetDefaultFilter     (fFilterMin, fFilterMag);
  glBitmapGetDefaultTextureWrap(fWrapS, fWrapT, fWrapR);
{$IFNDEF OPENGL_ES}
  glBitmapGetDefaultSwizzle    (fSwizzle[0], fSwizzle[1], fSwizzle[2], fSwizzle[3]);
{$ENDIF}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.BeforeDestruction;
begin
  if (fID > 0) and fDeleteTextureOnFree then
    glDeleteTextures(1, @fID);
  inherited BeforeDestruction;
end;

{$IFNDEF OPENGL_ES}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetBorderColor(const aRed, aGreen, aBlue, aAlpha: Single);
begin
  fBorderColor[0] := aRed;
  fBorderColor[1] := aGreen;
  fBorderColor[2] := aBlue;
  fBorderColor[3] := aAlpha;
  if (ID > 0) then begin
    Bind(false);
    glTexParameterfv(Target, GL_TEXTURE_BORDER_COLOR, @fBorderColor[0]);
  end;
end;
{$ENDIF}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetFilter(const aMin, aMag: GLenum);
begin
  //check MIN filter
  case aMin of
    GL_NEAREST:
      fFilterMin := GL_NEAREST;
    GL_LINEAR:
      fFilterMin := GL_LINEAR;
    GL_NEAREST_MIPMAP_NEAREST:
      fFilterMin := GL_NEAREST_MIPMAP_NEAREST;
    GL_LINEAR_MIPMAP_NEAREST:
      fFilterMin := GL_LINEAR_MIPMAP_NEAREST;
    GL_NEAREST_MIPMAP_LINEAR:
      fFilterMin := GL_NEAREST_MIPMAP_LINEAR;
    GL_LINEAR_MIPMAP_LINEAR:
      fFilterMin := GL_LINEAR_MIPMAP_LINEAR;
    else
      raise EglBitmap.Create('SetFilter - Unknow MIN filter.');
  end;

  //check MAG filter
  case aMag of
    GL_NEAREST:
      fFilterMag := GL_NEAREST;
    GL_LINEAR:
      fFilterMag := GL_LINEAR;
    else
      raise EglBitmap.Create('SetFilter - Unknow MAG filter.');
  end;

  //apply filter
  if (ID > 0) then begin
    Bind(false);
    glTexParameteri(Target, GL_TEXTURE_MAG_FILTER, fFilterMag);

    if (MipMap = mmNone) {$IFNDEF OPENGL_ES}or (Target = GL_TEXTURE_RECTANGLE){$ENDIF} then begin
      case fFilterMin of
        GL_NEAREST, GL_LINEAR:
          glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, fFilterMin);
        GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST_MIPMAP_LINEAR:
          glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR_MIPMAP_LINEAR:
          glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
      end;
    end else
      glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, fFilterMin);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetWrap(const S: GLenum; const T: GLenum; const R: GLenum);

  procedure CheckAndSetWrap(const aValue: Cardinal; var aTarget: Cardinal);
  begin
    case aValue of
{$IFNDEF OPENGL_ES}
      GL_CLAMP:
        aTarget := GL_CLAMP;
{$ENDIF}

      GL_REPEAT:
        aTarget := GL_REPEAT;

      GL_CLAMP_TO_EDGE: begin
{$IFNDEF OPENGL_ES}
        if not GL_VERSION_1_2 and not GL_EXT_texture_edge_clamp then
          aTarget := GL_CLAMP
        else
{$ENDIF}
          aTarget := GL_CLAMP_TO_EDGE;
      end;

{$IFNDEF OPENGL_ES}
      GL_CLAMP_TO_BORDER: begin
        if GL_VERSION_1_3 or GL_ARB_texture_border_clamp then
          aTarget := GL_CLAMP_TO_BORDER
        else
          aTarget := GL_CLAMP;
      end;
{$ENDIF}

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_2_0)}
      GL_MIRRORED_REPEAT: begin
  {$IFNDEF OPENGL_ES}
        if GL_VERSION_1_4 or GL_ARB_texture_mirrored_repeat or GL_IBM_texture_mirrored_repeat then
  {$ELSE}
        if GL_VERSION_2_0 then
  {$ENDIF}
          aTarget := GL_MIRRORED_REPEAT
        else
          raise EglBitmap.Create('SetWrap - Unsupported Texturewrap GL_MIRRORED_REPEAT (S).');
      end;
{$IFEND}
    else
      raise EglBitmap.Create('SetWrap - Unknow Texturewrap');
    end;
  end;

begin
  CheckAndSetWrap(S, fWrapS);
  CheckAndSetWrap(T, fWrapT);
  CheckAndSetWrap(R, fWrapR);

  if (ID > 0) then begin
    Bind(false);
    glTexParameteri(Target, GL_TEXTURE_WRAP_S, fWrapS);
    glTexParameteri(Target, GL_TEXTURE_WRAP_T, fWrapT);
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
    {$IFDEF OPENGL_ES} if GL_VERSION_3_0 then{$ENDIF}
    glTexParameteri(Target, GL_TEXTURE_WRAP_R, fWrapR);
{$IFEND}
  end;
end;

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.SetSwizzle(const r, g, b, a: GLenum);

  procedure CheckAndSetValue(const aValue: GLenum; const aIndex: Integer);
  begin
    if (aValue = GL_ZERO) or (aValue =   GL_ONE) or (aValue = GL_ALPHA) or
       (aValue =  GL_RED) or (aValue = GL_GREEN) or (aValue =  GL_BLUE) then
      fSwizzle[aIndex] := aValue
    else
      raise EglBitmap.Create('SetSwizzle - Unknow Swizle Value');
  end;

begin
{$IFNDEF OPENGL_ES}
  if not (GL_ARB_texture_swizzle or GL_EXT_texture_swizzle or GL_VERSION_3_3) then
    raise EglBitmapNotSupported.Create('texture swizzle is not supported');
{$ELSE}
  if not GL_VERSION_3_0 then
    raise EglBitmapNotSupported.Create('texture swizzle is not supported');
{$ENDIF}
  CheckAndSetValue(r, 0);
  CheckAndSetValue(g, 1);
  CheckAndSetValue(b, 2);
  CheckAndSetValue(a, 3);

  if (ID > 0) then begin
    Bind(false);
{$IFNDEF OPENGL_ES}
    glTexParameteriv(Target, GL_TEXTURE_SWIZZLE_RGBA, PGLint(@fSwizzle[0]));
{$ELSE}
    glTexParameteriv(Target, GL_TEXTURE_SWIZZLE_R, PGLint(@fSwizzle[0]));
    glTexParameteriv(Target, GL_TEXTURE_SWIZZLE_G, PGLint(@fSwizzle[1]));
    glTexParameteriv(Target, GL_TEXTURE_SWIZZLE_B, PGLint(@fSwizzle[2]));
    glTexParameteriv(Target, GL_TEXTURE_SWIZZLE_A, PGLint(@fSwizzle[3]));
{$ENDIF}
  end;
end;
{$IFEND}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.Bind(const aEnableTextureUnit: Boolean);
begin
  if aEnableTextureUnit then
    glEnable(Target);
  if (ID > 0) then
    glBindTexture(Target, ID);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.Unbind(const aDisableTextureUnit: Boolean);
begin
  if aDisableTextureUnit then
    glDisable(Target);
  glBindTexture(Target, 0);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap.UploadData(const aDataObj: TglBitmapData; const aCheckSize: Boolean);
var
  w, h: Integer;
begin
  w := aDataObj.Width;
  h := aDataObj.Height;
  fDimension.Fields := [];
  if (w > 0) then
    fDimension.Fields := fDimension.Fields + [ffX];
  if (h > 0) then
    fDimension.Fields := fDimension.Fields + [ffY];
  fDimension.X := w;
  fDimension.Y := h;
end;

{$IFNDEF OPENGL_ES}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TglBitmap.DownloadData(const aDataObj: TglBitmapData): Boolean;
var
  Temp: PByte;
  TempWidth, TempHeight: Integer;
  TempIntFormat: GLint;
  IntFormat: TglBitmapFormat;
  FormatDesc: TFormatDescriptor;
begin
  result := false;
  Bind;

  // Request Data
  glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_WIDTH,           @TempWidth);
  glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_HEIGHT,          @TempHeight);
  glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_INTERNAL_FORMAT, @TempIntFormat);

  FormatDesc := (TglBitmapFormatDescriptor.GetByFormat(TempIntFormat) as TFormatDescriptor);
  IntFormat  := FormatDesc.Format;

  // Getting data from OpenGL
  FormatDesc := TFormatDescriptor.Get(IntFormat);
  GetMem(Temp, FormatDesc.GetSize(TempWidth, TempHeight));
  try
    if FormatDesc.IsCompressed then begin
      if not Assigned(glGetCompressedTexImage) then
        raise EglBitmap.Create('compressed formats not supported by video adapter');
      glGetCompressedTexImage(Target, 0, Temp)
    end else
      glGetTexImage(Target, 0, FormatDesc.glFormat, FormatDesc.glDataFormat, Temp);
    aDataObj.SetData(Temp, IntFormat, TempWidth, TempHeight);
    result := true;
  except
    if Assigned(Temp) then
      FreeMem(Temp);
    raise;
  end;
end;
{$ENDIF}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmap.Create;
begin
  if (ClassType = TglBitmap) then
    raise EglBitmap.Create('Don''t create TglBitmap directly. Use one of the deviated classes (TglBitmap2D) instead.');
  inherited Create;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TglBitmap.Create(const aData: TglBitmapData);
begin
  Create;
  UploadData(aData);
end;

{$IFNDEF OPENGL_ES}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmap1D/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap1D.UploadDataIntern(const aDataObj: TglBitmapData; const aBuildWithGlu: Boolean);
var
  fd: TglBitmapFormatDescriptor;
begin
  // Upload data
  fd := aDataObj.FormatDescriptor;
  if (fd.glFormat = 0) or (fd.glInternalFormat = 0) or (fd.glDataFormat = 0) then
    raise EglBitmap.Create('format is not supported by video adapter, please convert before uploading data');

  if fd.IsCompressed then begin
    if not Assigned(glCompressedTexImage1D) then
      raise EglBitmap.Create('compressed formats not supported by video adapter');
    glCompressedTexImage1D(Target, 0, fd.glInternalFormat, aDataObj.Width, 0, fd.GetSize(aDataObj.Width, 1), aDataObj.Data)
  end else if aBuildWithGlu then
    gluBuild1DMipmaps(Target, fd.glInternalFormat, aDataObj.Width, fd.glFormat, fd.glDataFormat, aDataObj.Data)
  else
    glTexImage1D(Target, 0, fd.glInternalFormat, aDataObj.Width, 0, fd.glFormat, fd.glDataFormat, aDataObj.Data);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap1D.AfterConstruction;
begin
  inherited;
  Target := GL_TEXTURE_1D;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap1D.UploadData(const aDataObj: TglBitmapData; const aCheckSize: Boolean);
var
  BuildWithGlu, TexRec: Boolean;
  TexSize: Integer;
begin
  if not Assigned(aDataObj) then
    exit;

  // Check Texture Size
  if (aCheckSize) then begin
    glGetIntegerv(GL_MAX_TEXTURE_SIZE, @TexSize);

    if (aDataObj.Width > TexSize) then
      raise EglBitmapSizeToLarge.Create('TglBitmap1D.GenTexture - The size for the texture is to large. It''s may be not conform with the Hardware.');

    TexRec := (GL_ARB_texture_rectangle or GL_EXT_texture_rectangle or GL_NV_texture_rectangle) and
              (Target = GL_TEXTURE_RECTANGLE);
    if not (IsPowerOfTwo(aDataObj.Width) or GL_ARB_texture_non_power_of_two or GL_VERSION_2_0 or TexRec) then
      raise EglBitmapNonPowerOfTwo.Create('TglBitmap1D.GenTexture - Rendercontex dosn''t support non power of two texture.');
  end;

  if (fID = 0) then
    CreateID;
  SetupParameters(BuildWithGlu);
  UploadDataIntern(aDataObj, BuildWithGlu);
  glAreTexturesResident(1, @fID, @fIsResident);

  inherited UploadData(aDataObj, aCheckSize);
end;
{$ENDIF}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmap2D/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap2D.UploadDataIntern(const aDataObj: TglBitmapData; const aTarget: GLenum; const aBuildWithGlu: Boolean);
var
  fd: TglBitmapFormatDescriptor;
begin
  fd := aDataObj.FormatDescriptor;
  if (fd.glFormat = 0) or (fd.glInternalFormat = 0) or (fd.glDataFormat = 0) then
    raise EglBitmap.Create('format is not supported by video adapter, please convert before uploading data');

  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

  if fd.IsCompressed then begin
    if not Assigned(glCompressedTexImage2D) then
      raise EglBitmap.Create('compressed formats not supported by video adapter');
    glCompressedTexImage2D(aTarget, 0, fd.glInternalFormat, aDataObj.Width, aDataObj.Height, 0, fd.GetSize(fDimension), aDataObj.Data)
{$IFNDEF OPENGL_ES}
  end else if aBuildWithGlu then begin
    gluBuild2DMipmaps(aTarget, fd.ChannelCount, aDataObj.Width, aDataObj.Height, fd.glFormat, fd.glDataFormat, aDataObj.Data)
{$ENDIF}
  end else begin
    glTexImage2D(aTarget, 0, fd.glInternalFormat, aDataObj.Width, aDataObj.Height, 0, fd.glFormat, fd.glDataFormat, aDataObj.Data);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap2D.AfterConstruction;
begin
  inherited;
  Target := GL_TEXTURE_2D;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmap2D.UploadData(const aDataObj: TglBitmapData; const aCheckSize: Boolean);
var
  {$IFNDEF OPENGL_ES}
  BuildWithGlu, TexRec: Boolean;
  {$ENDIF}
  PotTex: Boolean;
  TexSize: Integer;
begin
  if not Assigned(aDataObj) then
    exit;

  // Check Texture Size
  if (aCheckSize) then begin
    glGetIntegerv(GL_MAX_TEXTURE_SIZE, @TexSize);

    if ((aDataObj.Width > TexSize) or (aDataObj.Height > TexSize)) then
      raise EglBitmapSizeToLarge.Create('TglBitmap2D.GenTexture - The size for the texture is to large. It''s may be not conform with the Hardware.');

    PotTex := IsPowerOfTwo(aDataObj.Width) and IsPowerOfTwo(aDataObj.Height);
{$IF NOT DEFINED(OPENGL_ES)}
    TexRec := (GL_ARB_texture_rectangle or GL_EXT_texture_rectangle or GL_NV_texture_rectangle) and (Target = GL_TEXTURE_RECTANGLE);
    if not (PotTex or GL_ARB_texture_non_power_of_two or GL_VERSION_2_0 or TexRec) then
      raise EglBitmapNonPowerOfTwo.Create('TglBitmap2D.GenTexture - Rendercontex dosn''t support non power of two texture.');
{$ELSEIF DEFINED(OPENGL_ES_EXT)}
    if not PotTex and not GL_OES_texture_npot then
      raise EglBitmapNonPowerOfTwo.Create('TglBitmap2D.GenTexture - Rendercontex dosn''t support non power of two texture.');
{$ELSE}
    if not PotTex then
      raise EglBitmapNonPowerOfTwo.Create('TglBitmap2D.GenTexture - Rendercontex dosn''t support non power of two texture.');
{$IFEND}
  end;

  if (fID = 0) then
    CreateID;
  SetupParameters({$IFNDEF OPENGL_ES}BuildWithGlu{$ENDIF});
  UploadDataIntern(aDataObj, Target{$IFNDEF OPENGL_ES}, BuildWithGlu{$ENDIF});
{$IFNDEF OPENGL_ES}
  glAreTexturesResident(1, @fID, @fIsResident);
{$ENDIF}

  inherited UploadData(aDataObj, aCheckSize);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class procedure TglBitmap2D.GrabScreen(const aTop, aLeft, aRight, aBottom: Integer; const aFormat: TglBitmapFormat; const aDataObj: TglBitmapData);
var
  Temp: pByte;
  Size, w, h: Integer;
  FormatDesc: TFormatDescriptor;
begin
  FormatDesc := TFormatDescriptor.Get(aFormat);
  if FormatDesc.IsCompressed then
    raise EglBitmapUnsupportedFormat.Create(aFormat);

  w    := aRight  - aLeft;
  h    := aBottom - aTop;
  Size := FormatDesc.GetSize(w, h);
  GetMem(Temp, Size);
  try
    glPixelStorei(GL_PACK_ALIGNMENT, 1);
    glReadPixels(aLeft, aTop, w, h, FormatDesc.glFormat, FormatDesc.glDataFormat, Temp);
    aDataObj.SetData(Temp, aFormat, w, h);
    aDataObj.FlipVert;
  except
    if Assigned(Temp) then
      FreeMem(Temp);
    raise;
  end;
end;

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_2_0)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmapCubeMap////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapCubeMap.AfterConstruction;
begin
  inherited;

{$IFNDEF OPENGL_ES}
  if not (GL_VERSION_1_3 or GL_ARB_texture_cube_map or GL_EXT_texture_cube_map) then
    raise EglBitmap.Create('TglBitmapCubeMap.AfterConstruction - CubeMaps are unsupported.');
{$ELSE}
  if not (GL_VERSION_2_0) then
    raise EglBitmap.Create('TglBitmapCubeMap.AfterConstruction - CubeMaps are unsupported.');
{$ENDIF}

  SetWrap;
  Target   := GL_TEXTURE_CUBE_MAP;
{$IFNDEF OPENGL_ES}
  fGenMode := GL_REFLECTION_MAP;
{$ENDIF}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapCubeMap.UploadData(const aDataObj: TglBitmapData; const aCheckSize: Boolean);
begin
  Assert(false, 'TglBitmapCubeMap.UploadData - Don''t call UploadData directly, use UploadCubeMap instead');
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapCubeMap.UploadCubeMap(const aDataObj: TglBitmapData; const aCubeTarget: Cardinal; const aCheckSize: Boolean);
var
  {$IFNDEF OPENGL_ES}
  BuildWithGlu: Boolean;
  {$ENDIF}
  TexSize: Integer;
begin
  if (aCheckSize) then begin
    glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, @TexSize);

    if (aDataObj.Width > TexSize) or (aDataObj.Height > TexSize) then
      raise EglBitmapSizeToLarge.Create('TglBitmapCubeMap.GenerateCubeMap - The size for the Cubemap is to large. It''s may be not conform with the Hardware.');

{$IF NOT DEFINED(OPENGL_ES)}
    if not ((IsPowerOfTwo(aDataObj.Width) and IsPowerOfTwo(aDataObj.Height)) or GL_VERSION_2_0 or GL_ARB_texture_non_power_of_two) then
      raise EglBitmapNonPowerOfTwo.Create('TglBitmapCubeMap.GenerateCubeMap - Cubemaps dosn''t support non power of two texture.');
{$ELSEIF DEFINED(OPENGL_ES_EXT)}
    if not (IsPowerOfTwo(aDataObj.Width) and IsPowerOfTwo(aDataObj.Height)) and not GL_OES_texture_npot then
      raise EglBitmapNonPowerOfTwo.Create('TglBitmapCubeMap.GenerateCubeMap - Cubemaps dosn''t support non power of two texture.');
{$ELSE}
    if not (IsPowerOfTwo(aDataObj.Width) and IsPowerOfTwo(aDataObj.Height)) then
      raise EglBitmapNonPowerOfTwo.Create('TglBitmapCubeMap.GenerateCubeMap - Cubemaps dosn''t support non power of two texture.');
{$IFEND}
  end;

  if (fID = 0) then
    CreateID;
  SetupParameters({$IFNDEF OPENGL_ES}BuildWithGlu{$ENDIF});
  UploadDataIntern(aDataObj, aCubeTarget{$IFNDEF OPENGL_ES}, BuildWithGlu{$ENDIF});

  inherited UploadData(aDataObj, aCheckSize);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapCubeMap.Bind({$IFNDEF OPENGL_ES}const aEnableTexCoordsGen: Boolean;{$ENDIF} const aEnableTextureUnit: Boolean);
begin
  inherited Bind (aEnableTextureUnit);
{$IFNDEF OPENGL_ES}
  if aEnableTexCoordsGen then begin
    glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, fGenMode);
    glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, fGenMode);
    glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, fGenMode);
    glEnable(GL_TEXTURE_GEN_S);
    glEnable(GL_TEXTURE_GEN_T);
    glEnable(GL_TEXTURE_GEN_R);
  end;
{$ENDIF}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapCubeMap.Unbind({$IFNDEF OPENGL_ES}const aDisableTexCoordsGen: Boolean;{$ENDIF} const aDisableTextureUnit: Boolean);
begin
  inherited Unbind(aDisableTextureUnit);
{$IFNDEF OPENGL_ES}
  if aDisableTexCoordsGen then begin
    glDisable(GL_TEXTURE_GEN_S);
    glDisable(GL_TEXTURE_GEN_T);
    glDisable(GL_TEXTURE_GEN_R);
  end;
{$ENDIF}
end;
{$IFEND}

{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_2_0)}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TglBitmapNormalMap//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
type
  TVec = Array[0..2] of Single;
  TglBitmapNormalMapGetVectorFunc = procedure (out aVec: TVec; const aPosition: TglBitmapPixelPosition; const aHalfSize: Integer);

  PglBitmapNormalMapRec = ^TglBitmapNormalMapRec;
  TglBitmapNormalMapRec = record
    HalfSize : Integer;
    Func: TglBitmapNormalMapGetVectorFunc;
  end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapNormalMapPosX(out aVec: TVec; const aPosition: TglBitmapPixelPosition; const aHalfSize: Integer);
begin
  aVec[0] := aHalfSize;
  aVec[1] := - (aPosition.Y + 0.5 - aHalfSize);
  aVec[2] := - (aPosition.X + 0.5 - aHalfSize);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapNormalMapNegX(out aVec: TVec; const aPosition: TglBitmapPixelPosition; const aHalfSize: Integer);
begin
  aVec[0] := - aHalfSize;
  aVec[1] := - (aPosition.Y + 0.5 - aHalfSize);
  aVec[2] := aPosition.X + 0.5 - aHalfSize;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapNormalMapPosY(out aVec: TVec; const aPosition: TglBitmapPixelPosition; const aHalfSize: Integer);
begin
  aVec[0] := aPosition.X + 0.5 - aHalfSize;
  aVec[1] := aHalfSize;
  aVec[2] := aPosition.Y + 0.5 - aHalfSize;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapNormalMapNegY(out aVec: TVec; const aPosition: TglBitmapPixelPosition; const aHalfSize: Integer);
begin
  aVec[0] := aPosition.X + 0.5 - aHalfSize;
  aVec[1] := - aHalfSize;
  aVec[2] := - (aPosition.Y + 0.5 - aHalfSize);
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapNormalMapPosZ(out aVec: TVec; const aPosition: TglBitmapPixelPosition; const aHalfSize: Integer);
begin
  aVec[0] := aPosition.X + 0.5 - aHalfSize;
  aVec[1] := - (aPosition.Y + 0.5 - aHalfSize);
  aVec[2] := aHalfSize;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapNormalMapNegZ(out aVec: TVec; const aPosition: TglBitmapPixelPosition; const aHalfSize: Integer);
begin
  aVec[0] := - (aPosition.X + 0.5 - aHalfSize);
  aVec[1] := - (aPosition.Y + 0.5 - aHalfSize);
  aVec[2] := - aHalfSize;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure glBitmapNormalMapFunc(var FuncRec: TglBitmapFunctionRec);
var
  i: Integer;
  Vec: TVec;
  Len: Single;
begin
  with FuncRec do begin
    with PglBitmapNormalMapRec(Args)^ do begin
      Func(Vec, Position, HalfSize);

      // Normalize
      Len := 1 / Sqrt(Sqr(Vec[0]) + Sqr(Vec[1]) + Sqr(Vec[2]));
      if Len <> 0 then begin
        Vec[0] := Vec[0] * Len;
        Vec[1] := Vec[1] * Len;
        Vec[2] := Vec[2] * Len;
      end;

      // Scale Vector and AddVectro
      Vec[0] := Vec[0] * 0.5 + 0.5;
      Vec[1] := Vec[1] * 0.5 + 0.5;
      Vec[2] := Vec[2] * 0.5 + 0.5;
    end;

    // Set Color
    for i := 0 to 2 do
      Dest.Data.arr[i] := Round(Vec[i] * 255);
  end;
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapNormalMap.AfterConstruction;
begin
  inherited;
{$IFNDEF OPENGL_ES}
  fGenMode := GL_NORMAL_MAP;
{$ENDIF}
end;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TglBitmapNormalMap.GenerateNormalMap(const aSize: Integer; const aCheckSize: Boolean);
var
  Rec: TglBitmapNormalMapRec;
  SizeRec: TglBitmapSize;
  DataObj: TglBitmapData;
begin
  Rec.HalfSize := aSize div 2;

  SizeRec.Fields := [ffX, ffY];
  SizeRec.X := aSize;
  SizeRec.Y := aSize;

  DataObj := TglBitmapData.Create;
  try
    // Positive X
    Rec.Func := glBitmapNormalMapPosX;
    DataObj.LoadFromFunc(SizeRec, tfBGR8ub3, glBitmapNormalMapFunc, @Rec);
    UploadCubeMap(DataObj, GL_TEXTURE_CUBE_MAP_POSITIVE_X, aCheckSize);

    // Negative X
    Rec.Func := glBitmapNormalMapNegX;
    DataObj.LoadFromFunc(SizeRec, tfBGR8ub3, glBitmapNormalMapFunc, @Rec);
    UploadCubeMap(DataObj, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, aCheckSize);

    // Positive Y
    Rec.Func := glBitmapNormalMapPosY;
    DataObj.LoadFromFunc(SizeRec, tfBGR8ub3, glBitmapNormalMapFunc, @Rec);
    UploadCubeMap(DataObj, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, aCheckSize);

    // Negative Y
    Rec.Func := glBitmapNormalMapNegY;
    DataObj.LoadFromFunc(SizeRec, tfBGR8ub3, glBitmapNormalMapFunc, @Rec);
    UploadCubeMap(DataObj, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, aCheckSize);

    // Positive Z
    Rec.Func := glBitmapNormalMapPosZ;
    DataObj.LoadFromFunc(SizeRec, tfBGR8ub3, glBitmapNormalMapFunc, @Rec);
    UploadCubeMap(DataObj, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, aCheckSize);

    // Negative Z
    Rec.Func := glBitmapNormalMapNegZ;
    DataObj.LoadFromFunc(SizeRec, tfBGR8ub3, glBitmapNormalMapFunc, @Rec);
    UploadCubeMap(DataObj, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, aCheckSize);
  finally
    FreeAndNil(DataObj);
  end;
end;
{$IFEND}

initialization
  glBitmapSetDefaultFormat (tfEmpty);
  glBitmapSetDefaultMipmap (mmMipmap);
  glBitmapSetDefaultFilter (GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR);
  glBitmapSetDefaultWrap   (GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE);
{$IF NOT DEFINED(OPENGL_ES) OR DEFINED(OPENGL_ES_3_0)}
  glBitmapSetDefaultSwizzle(GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA);
{$IFEND}

  glBitmapSetDefaultFreeDataAfterGenTexture(true);
  glBitmapSetDefaultDeleteTextureOnFree    (true);

  TFormatDescriptor.Init;

finalization
  TFormatDescriptor.Finalize;

end.