* TDDPixelFormat
 *)
  PDDPixelFormat_DX5 = ^TDDPixelFormat_DX5;
  TDDPixelFormat_DX5 = packed record
    dwSize   : LongWord;    // size of structure
    dwFlags  : LongWord;    // pixel format flags
    dwFourCC : LongWord;    // (FOURCC code)
    case Integer of
    0: (
      dwZBufferBitDepth : LongWord;  // how many bits for z buffers
     );
    1: (
      dwAlphaBitDepth : LongWord;    // how many bits for alpha channels
     );
    2: (
      dwRGBBitCount     : LongWord;  // how many bits per pixel
      dwRBitMask        : LongWord;  // mask for red bit
      dwGBitMask        : LongWord;  // mask for green bits
      dwBBitMask        : LongWord;  // mask for blue bits
      dwRGBAlphaBitMask : LongWord;  // mask for alpha channel
     );
    3: (
      dwYUVBitCount : LongWord;      // how many bits per pixel
      dwYBitMask    : LongWord;      // mask for Y bits
      dwUBitMask    : LongWord;      // mask for U bits
      dwVBitMask    : LongWord;      // mask for V bits
      case Integer of
      0: (
        dwYUVAlphaBitMask : LongWord; // mask for alpha channel
       );
      1: (
        dwRGBZBitMask : LongWord;
       );
      2: (
        dwYUVZBitMask : LongWord;
       );
     );
  end;

  PDDPixelFormat_DX6 = ^TDDPixelFormat_DX6;
  TDDPixelFormat_DX6 = packed record
    dwSize   : LongWord;              // size of structure
    dwFlags  : LongWord;              // pixel format flags
    dwFourCC : LongWord;              // (FOURCC code)
    case Integer of
      1: (                 
          dwRGBBitCount     : LongWord;  // how many bits per pixel
          dwRBitMask        : LongWord;  // mask for red bit
          dwGBitMask        : LongWord;  // mask for green bits
          dwBBitMask        : LongWord;  // mask for blue bits
          dwRGBAlphaBitMask : LongWord;  // mask for alpha channel
          );
      2: (                  
          dwYUVBitCount     : LongWord;  // how many bits per pixel
          dwYBitMask        : LongWord;  // mask for Y bits
          dwUBitMask        : LongWord;  // mask for U bits
          dwVBitMask        : LongWord;  // mask for V bits
          dwYUVAlphaBitMask : LongWord;  // mask for alpha channel
          );
      3: (
          dwZBufferBitDepth       : LongWord;  // how many total bits/pixel in z buffer (including any stencil bits)
          dwStencilBitDepth       : LongWord;  // how many stencil bits (note: dwZBufferBitDepth-dwStencilBitDepth is total Z-only bits)
          dwZBitMask              : LongWord;  // mask for Z bits
          dwStencilBitMask        : LongWord;  // mask for stencil bits
          dwLuminanceAlphaBitMask : LongWord;  // mask for alpha channel
          );
      4: (
          dwAlphaBitDepth        : LongWord;  // how many bits for alpha channels
          dwLuminanceBitMask     : LongWord;  // mask for luminance bits
          dwBumpDvBitMask        : LongWord;  // mask for bump map V delta bits
          dwBumpLuminanceBitMask : LongWord;  // mask for luminance in bump map
          dwRGBZBitMask          : LongWord;  // mask for Z channel
          );
      5: (
           dwLuminanceBitCount : LongWord;  // how many bits per pixel
           dwBumpDuBitMask     : LongWord;  // mask for bump map U delta bits
           Fill1, Fill2        : LongWord;
           dwYUVZBitMask       : LongWord;  // mask for Z channel
         );
      6: ( dwBumpBitCount : LongWord;       // how many bits per "buxel", total
         );
  end;

  TDDPixelFormat_DX3 = TDDPixelFormat_DX5;
  TDDPixelFormat_DX7 = TDDPixelFormat_DX6;

  PDDPixelFormat = ^TDDPixelFormat;
{$IFDEF DIRECTX3}
  TDDPixelFormat = TDDPixelFormat_DX3;
{$ELSE}
  {$IFDEF DIRECTX5}
    TDDPixelFormat = TDDPixelFormat_DX5;
  {$ELSE}
    {$IFDEF DIRECTX6}
      TDDPixelFormat = TDDPixelFormat_DX6;
    {$ELSE}
      TDDPixelFormat = TDDPixelFormat_DX7;
    {$ENDIF}
  {$ENDIF}
{$ENDIF}

(*
 * TDDOverlayFX
 *)
  PDDOverlayFX = ^TDDOverlayFX;
  TDDOverlayFX = packed record
    dwSize                   : LongWord;       // size of structure
    dwAlphaEdgeBlendBitDepth : LongWord;       // Bit depth used to specify constant for alpha edge blend
    dwAlphaEdgeBlend         : LongWord;       // Constant to use as alpha for edge blend
    dwReserved               : LongWord;
    dwAlphaDestConstBitDepth : LongWord;       // Bit depth used to specify alpha constant for destination
    case Integer of
    0: (
      dwAlphaDestConst        : LongWord;     // Constant to use as alpha channel for dest
      dwAlphaSrcConstBitDepth : LongWord;     // Bit depth used to specify alpha constant for source
      dwAlphaSrcConst         : LongWord;     // Constant to use as alpha channel for src
      dckDestColorkey         : TDDColorKey;  // DestColorkey override
      dckSrcColorkey          : TDDColorKey;  // DestColorkey override
      dwDDFX                  : LongWord;     // Overlay FX
      dwFlags                 : LongWord;     // flags
     );
    1: (
      lpDDSAlphaDest : PDirectDrawSurface;    // Surface to use as alpha channel for dest
      filler         : LongWord;
      lpDDSAlphaSrc  : PDirectDrawSurface;    // Surface to use as alpha channel for src
     );
  end;

(*
 * TDDBltBatch: BltBatch entry structure
 *)
  PDDBltBatch = ^TDDBltBatch;
  TDDBltBatch = packed record
    lprDest   : PRect;
    lpDDSSrc  : IDirectDrawSurface;
    lprSrc    : PRect;
    dwFlags   : LongWord;
    lpDDBltFx : TDDBltFX;
  end;

(*
 * TDDGammaRamp
 *)
  PDDGammaRamp = ^TDDGammaRamp;
  TDDGammaRamp = packed record
    red   : array[0..255] of Word;
    green : array[0..255] of Word;
    blue  : array[0..255] of Word;
  end;

(*
 *  This is the structure within which DirectDraw returns data about the current graphics driver and chipset
 *)

  PDDDeviceIdentifier = ^TDDDeviceIdentifier;
  TDDDeviceIdentifier = packed record
    //
    // These elements are for presentation to the user only. They should not be used to identify particular
    // drivers, since this is unreliable and many different strings may be associated with the same
    // device, and the same driver from different vendors.
    //
    szDriver      : array[0..MAX_DDDEVICEID_STRING-1] of Char;
    szDescription : array[0..MAX_DDDEVICEID_STRING-1] of Char;

    //
    // This element is the version of the DirectDraw/3D driver. It is legal to do <, > comparisons
    // on the whole 64 bits. Caution should be exercised if you use this element to identify problematic
    // drivers. It is recommended that guidDeviceIdentifier is used for this purpose.
    //
    // This version has the form:
    //  wProduct = HIWORD(liDriverVersion.HighPart)
    //  wVersion = LOWORD(liDriverVersion.HighPart)
    //  wSubVersion = HIWORD(liDriverVersion.LowPart)
    //  wBuild = LOWORD(liDriverVersion.LowPart)
    //
    liDriverVersion : TLargeInteger;     // Defined for applications and other 32 bit components

    //
    // These elements can be used to identify particular chipsets. Use with extreme caution.
    //   dwVendorId     Identifies the manufacturer. May be zero if unknown.
    //   dwDeviceId     Identifies the type of chipset. May be zero if unknown.
    //   dwSubSysId     Identifies the subsystem, typically this means the particular board. May be zero if unknown.
    //   dwRevision     Identifies the revision level of the chipset. May be zero if unknown.
    //
    dwVendorId : LongWord;
    dwDeviceId : LongWord;
    dwSubSysId : LongWord;
    dwRevision : LongWord;

    //
    // This element can be used to check changes in driver/chipset. This GUID is a unique identifier for the
    // driver/chipset pair. Use this element if you wish to track changes to the driver/chipset in order to
    // reprofile the graphics subsystem.
    // This element can also be used to identify particular problematic drivers.
    //
    guidDeviceIdentifier : TGUID;
  end;

  PDDDeviceIdentifier2 = ^TDDDeviceIdentifier2;
  TDDDeviceIdentifier2 = packed record
    //
    // These elements are for presentation to the user only. They should not be used to identify particular
    // drivers, since this is unreliable and many different strings may be associated with the same
    // device, and the same driver from different vendors.
    //
    szDriver      : array[0..MAX_DDDEVICEID_STRING-1] of Char;
    szDescription : array[0..MAX_DDDEVICEID_STRING-1] of Char;

    //
    // This element is the version of the DirectDraw/3D driver. It is legal to do <, > comparisons
    // on the whole 64 bits. Caution should be exercised if you use this element to identify problematic
    // drivers. It is recommended that guidDeviceIdentifier is used for this purpose.
    //
    // This version has the form:
    //  wProduct = HIWORD(liDriverVersion.HighPart)
    //  wVersion = LOWORD(liDriverVersion.HighPart)
    //  wSubVersion = HIWORD(liDriverVersion.LowPart)
    //  wBuild = LOWORD(liDriverVersion.LowPart)
    //
    liDriverVersion : TLargeInteger;     // Defined for applications and other 32 bit components

    //
    // These elements can be used to identify particular chipsets. Use with extreme caution.
    //   dwVendorId     Identifies the manufacturer. May be zero if unknown.
    //   dwDeviceId     Identifies the type of chipset. May be zero if unknown.
    //   dwSubSysId     Identifies the subsystem, typically this means the particular board. May be zero if unknown.
    //   dwRevision     Identifies the revision level of the chipset. May be zero if unknown.
    //
    dwVendorId : LongWord;
    dwDeviceId : LongWord;
    dwSubSysId : LongWord;
    dwRevision : LongWord;

    //
    // This element can be used to check changes in driver/chipset. This GUID is a unique identifier for the
    // driver/chipset pair. Use this element if you wish to track changes to the driver/chipset in order to
    // reprofile the graphics subsystem.
    // This element can also be used to identify particular problematic drivers.
    //