unit uvkuCommandBuffer;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils,
  Vulkan, uvkuBase;

type
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  TvkuCommandBuffer = class(TvkuHandle)
  private
    fHandle: VkCommandBuffer;
    fCommandPool: VkCommandPool;
    fDeviceCommands: TVkDeviceCommands;
  public
    property Handle:          VkCommandBuffer   read fHandle;
    property CommandPool:     VkCommandPool     read fCommandPool;
    property DeviceCommands:  TVkDeviceCommands read fDeviceCommands;

    procedure BeginCommand;

    constructor Create(
      const aHandle: VkCommandBuffer;
      const aOwnsHandle: Boolean;
      const aCommandPool: VkCommandPool;
      const aDeviceCommands: TVkDeviceCommands);
    destructor Destroy; override;
  end;

implementation

uses
  uvkuUtils;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//TvkuCommandBuffer//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
procedure TvkuCommandBuffer.BeginCommand;
var
  Info: TVkCommandBufferBeginInfo;
  err: TVkResult;
begin
  FillByte(Info, SizeOf(Info), 0);
  Info.sType            := VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
  Info.pNext            := nil;
  Info.flags            := [];  // TODO
  Info.pInheritanceInfo := nil; // TODO
  err := DeviceCommands.vkBeginCommandBuffer(fHandle, @Info);
  if (err < VK_SUCCESS) then
    raise TvkuErrorException.Create('unable to begin command buffer', err);
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
constructor TvkuCommandBuffer.Create(const aHandle: VkCommandBuffer; const aOwnsHandle: Boolean;
  const aCommandPool: VkCommandPool; const aDeviceCommands: TVkDeviceCommands);
begin
  inherited Create;
  fHandle         := aHandle;
  fCommandPool    := aCommandPool;
  fDeviceCommands := aDeviceCommands;
  OwnsHandle      := aOwnsHandle;
end;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
destructor TvkuCommandBuffer.Destroy;
begin
  if OwnsHandle and (fHandle <> VK_INVALID_HANDLE) then
    fDeviceCommands.vkFreeCommandBuffers(fDeviceCommands.Device, fCommandPool, 1, @fHandle);
  fHandle := VK_INVALID_HANDLE;
  inherited Destroy;
end;

end.