unit uvkuBufferFactory;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils,
  Vulkan, uvkuBuffer, uvkuDevice, uvkuAllocationHandler, uvkuTypes, uvkuFactoryBase;

type
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuBufferEx = class(TvkuBuffer)
  private
    fAllocHandler: TvkuAllocationHandler;
    fOwnsHandle: Boolean;
  public
    destructor Destroy; override;
  end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuBufferFactory = class(TvkuDeviceObjFactory)
  private
    fFlags: VkBufferCreateFlags;
    fSize: VkDeviceSize;
    fUsage: VkBufferUsageFlags;
    fSharingMode: TVkSharingMode;
    fQueueFamilyIndices: TvkuUint32Arr;

    function GetQueueFamilyIndex(const aIndex: Integer): VkUint32;
    function GetQueueFamilyIndexCount: Integer;
    procedure SetQueueFamilyIndex(const aIndex: Integer; aValue: VkUint32);
  public
    property Flags:           VkBufferCreateFlags     read fFlags         write fFlags;
    property Size:            VkDeviceSize            read fSize          write fSize;
    property Usage:           VkBufferUsageFlags      read fUsage         write fUsage;
    property SharingMode:     TVkSharingMode          read fSharingMode   write fSharingMode;

    property QueueFamilyIndices: TvkuUint32Arr read fQueueFamilyIndices;
    property QueueFamilyIndexCount: Integer read GetQueueFamilyIndexCount;
    property QueueFamilyIndex[const aIndex: Integer]: VkUint32 read GetQueueFamilyIndex write SetQueueFamilyIndex;

    function CreateBuffer: TvkuBufferEx;
    function CreateBuffer(
      const aAllocHandler: TvkuAllocationHandler;
      const aOwnsHandler: Boolean): TvkuBufferEx;
  end;

implementation

uses
  uvkuUtils;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TvkuBufferEx///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
destructor TvkuBufferEx.Destroy;
begin
  inherited Destroy;
  if fOwnsHandle then
    FreeAndNil(fAllocHandler);
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TvkuBufferFactory//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TvkuBufferFactory.GetQueueFamilyIndex(const aIndex: Integer): VkUint32;
begin
  if (aIndex < low(fQueueFamilyIndices)) or (aIndex > high(fQueueFamilyIndices)) then
    raise TvkuException.CreateFmt('index (%d) out of range (%d : %d)', [aIndex, Low(fQueueFamilyIndices), High(fQueueFamilyIndices)]);
  result := fQueueFamilyIndices[aIndex];
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TvkuBufferFactory.GetQueueFamilyIndexCount: Integer;
begin
  result := Length(fQueueFamilyIndices);
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TvkuBufferFactory.SetQueueFamilyIndex(const aIndex: Integer; aValue: VkUint32);
begin
  if (aIndex < low(fQueueFamilyIndices)) or (aIndex > high(fQueueFamilyIndices)) then
    raise TvkuException.CreateFmt('index (%d) out of range (%d : %d)', [aIndex, Low(fQueueFamilyIndices), High(fQueueFamilyIndices)]);
  fQueueFamilyIndices[aIndex] := aValue;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TvkuBufferFactory.CreateBuffer: TvkuBufferEx;
begin
  result := CreateBuffer(nil, false);
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function TvkuBufferFactory.CreateBuffer(const aAllocHandler: TvkuAllocationHandler; const aOwnsHandler: Boolean): TvkuBufferEx;
var
  CreateInfo: TVkBufferCreateInfo;
begin
  FillByte(CreateInfo, 0, SizeOf(CreateInfo));
  CreateInfo.sType                 := VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
  CreateInfo.pNext                 := nil;
  CreateInfo.flags                 := fFlags;
  CreateInfo.size                  := fSize;
  CreateInfo.usage                 := fUsage;
  CreateInfo.sharingMode           := fSharingMode;
  CreateInfo.queueFamilyIndexCount := Length(fQueueFamilyIndices);
  CreateInfo.pQueueFamilyIndices   := @fQueueFamilyIndices[0];

  if Assigned(aAllocHandler)
    then result := TvkuBufferEx.Create(CreateInfo, DeviceCommands, aAllocHandler.GetAllocationCallbacksPtr)
    else result := TvkuBufferEx.Create(CreateInfo, DeviceCommands);
  try
    TvkuBufferEx(result).fAllocHandler := aAllocHandler;
    TvkuBufferEx(result).fOwnsHandle   := aOwnsHandler;
  except
    FreeAndNil(result);
    raise;
  end;
end;

end.