{ ============================================================================
  This file is autogenerated from vk.xml
  You may retrieve the latest version of this file at the Delphi OpenGL
  Community home page, located at http://www.delphigl.com/
  
  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
  
  Software distributed under the License is distributed on an
  "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  implied. See the License for the specific language governing
  rights and limitations under the License.

Original vk.xml comment:
==============================================================================
{%COMMENT%}
============================================================================ }
  
unit Vulkan;

{$I Vulkan.inc}

interface

type
  HINSTANCE = THandle;
  HWND      = THandle;

  VkHandle = Pointer;
  VkUint8  = Byte;
  VkUint16 = Word;
  VkUint32 = Cardinal;
  VkUint64 = QWord;
  VkInt16  = SmallInt;
  VkInt32  = Integer;
  VkInt64  = Int64;
  VkFloat  = Single;
  VkDouble = Double;
  VkChar   = AnsiChar;
  VkSize   = SizeUInt;

  PVkVoid   = Pointer;
  PVkHandle = ^VkHandle;
  PVkUint8  = ^VkUint8;
  PVkUint16 = ^VkUint16;
  PVkUint32 = ^VkUint32;
  PVkUint64 = ^VkUint64;
  PVkInt16  = ^VkInt16;
  PVkInt32  = ^VkInt32;
  PVkInt64  = ^VkInt64;
  PVkFloat  = ^VkFloat;
  PVkDouble = ^VkDouble;
  PVkChar   = ^VkChar;
  PVkSize   = ^VkSize;
  
  PPVkVoid   = ^PVkVoid;
  PPVkHandle = ^PVkHandle;
  PPVkUint8  = ^PVkUint8;
  PPVkUint16 = ^PVkUint16;
  PPVkUint32 = ^PVkUint32;
  PPVkUint64 = ^PVkUint64;
  PPVkInt16  = ^PVkInt16;
  PPVkInt32  = ^PVkInt32;
  PPVkInt64  = ^PVkInt64;
  PPVkFloat  = ^PVkFloat;
  PPVkDouble = ^PVkDouble;
  PPVkChar   = ^PVkChar;
  PPVkSize   = ^PVkSize;

{%INTERFACE%}

const
  VULKAN_LIBNAME = 'vulkan-1.dll';

type
  VkVersion = VkInt32;

function vkMakeVersion(const aMajor, aMinor, aPatch: Integer): VkVersion; inline;
function vkGetVersionMajor(const aVersion: VkVersion): Integer; inline;
function vkGetVersionMinor(const aVersion: VkVersion): Integer; inline;
function vkGetVersionPatch(const aVersion: VkVersion): Integer; inline;

function  InitializeVulkan(const aLibName: String = VULKAN_LIBNAME): Boolean;
procedure LoadVulkanCommands(const aInstance: VkInstance);
procedure FinalizeVulkan;

implementation

type
{$IF DEFINED(VK_WIN)}
  TvkLibHandle = TLibHandle;
{$ELSE}
  TvkLibHandle = Pointer;
{$ENDIF}

const
{$IF DEFINED(VK_WIN)}
  InvalidLibHandle = 0;
{$ELSE}
  InvalidLibHandle = nil;
{$ENDIF}

var
  vkLibHandle: TvkLibHandle = InvalidLibHandle;

function vkLoadLibrary(const aLibName: String): TvkLibHandle;
begin
  {$IF DEFINED(VK_WIN)}
  result := LoadLibrary(aLibName);
  {$ELSE}
  result := InvalidLibHandle;
  {$ENDIF}
end;

function vkGetProcAddress(const aProcName: String; aInstance: VkInstance = nil; aLibHandle: TvkLibHandle = InvalidLibHandle): TvkVoidFunction;
begin
  result := nil;
  if (aLibHandle = InvalidLibHandle) then
    aLibHandle := vkLibHandle;
  if Assigned(vkGetInstanceProcAddr) then begin
    result := vkGetInstanceProcAddr(aInstance, PVkChar(aProcName));
    if Assigned(result) then
      exit;
  end;
  
  {$IF DEFINED(VK_WIN)}
  result := GetProcAddress(aLibHandle, AnsiString(aProcName));
  {$ELSE}
  result := nil;
  {$ENDIF}
end;

procedure vkLoadAddresses(const aInstance: VkInstance = nil);
begin
  {%IMPLEMENTATION%}
end;

procedure vkFreeLibrary(var aLibHandle: TvkLibHandle);
begin
  if (aLibHandle <> InvalidLibHandle) then begin
    {$IF DEFINED(VK_WIN)}
    FreeLibrary(aLibHandle);
    {$ENDIF}
    aLibHandle := InvalidLibHandle;
  end;
end;

function vkMakeVersion(const aMajor, aMinor, aPatch: Integer): VkVersion;
begin
  result := (aMajor shl 22) or (aMinor shl 12) or aPatch;
end;

function vkGetVersionMajor(const aVersion: VkVersion): Integer;
begin
  result := (aVersion shr 22);
end;

function vkGetVersionMinor(const aVersion: VkVersion): Integer;
begin
  result := (aVersion shr 12) and $3FF;
end;

function vkGetVersionPatch(const aVersion: VkVersion): Integer;
begin
  result := (aVersion and $FFF);
end;

function InitializeVulkan(const aLibName: String = VULKAN_LIBNAME): Boolean;
begin
  FinalizeVulkan;
  vkLibHandle := vkLoadLibrary(aLibName);
  result := (vkLibHandle <> InvalidLibHandle);
  if not result then
    exit;
  vkGetInstanceProcAddr := TvkGetInstanceProcAddr(vkGetProcAddress('vkGetInstanceProcAddr'));
  vkLoadAddresses(nil);
end;

procedure LoadVulkanCommands(const aInstance: VkInstance);
begin
  vkLoadAddresses(aInstance);
end;       

procedure FinalizeVulkan;
begin
  vkFreeLibrary(vkLibHandle);
end;

initialization

finalization
  FinalizeVulkan;

end.