BYTE alpha;
} DDRGBA;

typedef DDRGBA FAR *LPDDRGBA;


/*
 * DDCOLORKEY
 */
typedef struct _DDCOLORKEY
{
    DWORD       dwColorSpaceLowValue;   // low boundary of color space that is to
                                        // be treated as Color Key, inclusive
    DWORD       dwColorSpaceHighValue;  // high boundary of color space that is
                                        // to be treated as Color Key, inclusive
} DDCOLORKEY;

typedef DDCOLORKEY FAR* LPDDCOLORKEY;

/*
 * DDBLTFX
 * Used to pass override information to the DIRECTDRAWSURFACE callback Blt.
 */
typedef struct _DDBLTFX
{
    DWORD       dwSize;                         // size of structure
    DWORD       dwDDFX;                         // FX operations
    DWORD       dwROP;                          // Win32 raster operations
    DWORD       dwDDROP;                        // Raster operations new for DirectDraw
    DWORD       dwRotationAngle;                // Rotation angle for blt
    DWORD       dwZBufferOpCode;                // ZBuffer compares
    DWORD       dwZBufferLow;                   // Low limit of Z buffer
    DWORD       dwZBufferHigh;                  // High limit of Z buffer
    DWORD       dwZBufferBaseDest;              // Destination base value
    DWORD       dwZDestConstBitDepth;           // Bit depth used to specify Z constant for destination
    union
    {
        DWORD   dwZDestConst;                   // Constant to use as Z buffer for dest
        LPDIRECTDRAWSURFACE lpDDSZBufferDest;   // Surface to use as Z buffer for dest
    } DUMMYUNIONNAMEN(1);
    DWORD       dwZSrcConstBitDepth;            // Bit depth used to specify Z constant for source
    union
    {
        DWORD   dwZSrcConst;                    // Constant to use as Z buffer for src
        LPDIRECTDRAWSURFACE lpDDSZBufferSrc;    // Surface to use as Z buffer for src
    } DUMMYUNIONNAMEN(2);
    DWORD       dwAlphaEdgeBlendBitDepth;       // Bit depth used to specify constant for alpha edge blend
    DWORD       dwAlphaEdgeBlend;               // Alpha for edge blending
    DWORD       dwReserved;
    DWORD       dwAlphaDestConstBitDepth;       // Bit depth used to specify alpha constant for destination
    union
    {
        DWORD   dwAlphaDestConst;               // Constant to use as Alpha Channel
        LPDIRECTDRAWSURFACE lpDDSAlphaDest;     // Surface to use as Alpha Channel
    } DUMMYUNIONNAMEN(3);
    DWORD       dwAlphaSrcConstBitDepth;        // Bit depth used to specify alpha constant for source
    union
    {
        DWORD   dwAlphaSrcConst;                // Constant to use as Alpha Channel
        LPDIRECTDRAWSURFACE lpDDSAlphaSrc;      // Surface to use as Alpha Channel
    } DUMMYUNIONNAMEN(4);
    union
    {
        DWORD   dwFillColor;                    // color in RGB or Palettized
        DWORD   dwFillDepth;                    // depth value for z-buffer
        DWORD   dwFillPixel;                    // pixel value for RGBA or RGBZ
        LPDIRECTDRAWSURFACE lpDDSPattern;       // Surface to use as pattern
    } DUMMYUNIONNAMEN(5);
    DDCOLORKEY  ddckDestColorkey;               // DestColorkey override
    DDCOLORKEY  ddckSrcColorkey;                // SrcColorkey override
} DDBLTFX;

typedef DDBLTFX FAR* LPDDBLTFX;



/*
 * DDSCAPS
 */
typedef struct _DDSCAPS
{
    DWORD       dwCaps;         // capabilities of surface wanted
} DDSCAPS;

typedef DDSCAPS FAR* LPDDSCAPS;


/*
 * DDOSCAPS
 */
typedef struct _DDOSCAPS
{
    DWORD       dwCaps;         // capabilities of surface wanted
} DDOSCAPS;

typedef DDOSCAPS FAR* LPDDOSCAPS;

/*
 * This structure is used internally by DirectDraw.
 */
typedef struct _DDSCAPSEX
{
    DWORD       dwCaps2;
    DWORD       dwCaps3;
    union
    {
        DWORD       dwCaps4;
        DWORD       dwVolumeDepth;
    } DUMMYUNIONNAMEN(1);
} DDSCAPSEX, FAR * LPDDSCAPSEX;

/*
 * DDSCAPS2
 */
typedef struct _DDSCAPS2
{
    DWORD       dwCaps;         // capabilities of surface wanted
    DWORD       dwCaps2;
    DWORD       dwCaps3;
    union
    {
        DWORD       dwCaps4;
        DWORD       dwVolumeDepth;
    } DUMMYUNIONNAMEN(1);
} DDSCAPS2;

typedef DDSCAPS2 FAR* LPDDSCAPS2;

/*
 * DDCAPS
 */
#define DD_ROP_SPACE            (256/32)        // space required to store ROP array
/*
 * NOTE: Our choosen structure number scheme is to append a single digit to
 * the end of the structure giving the version that structure is associated
 * with.
 */

/*
 * This structure represents the DDCAPS structure released in DirectDraw 1.0.  It is used internally
 * by DirectDraw to interpret caps passed into ddraw by drivers written prior to the release of DirectDraw 2.0.
 * New applications should use the DDCAPS structure defined below.
 */
typedef struct _DDCAPS_DX1
{
    DWORD       dwSize;                 // size of the DDDRIVERCAPS structure
    DWORD       dwCaps;                 // driver specific capabilities
    DWORD       dwCaps2;                // more driver specific capabilites
    DWORD       dwCKeyCaps;             // color key capabilities of the surface
    DWORD       dwFXCaps;               // driver specific stretching and effects capabilites
    DWORD       dwFXAlphaCaps;          // alpha driver specific capabilities
    DWORD       dwPalCaps;              // palette capabilities
    DWORD       dwSVCaps;               // stereo vision capabilities
    DWORD       dwAlphaBltConstBitDepths;       // DDBD_2,4,8
    DWORD       dwAlphaBltPixelBitDepths;       // DDBD_1,2,4,8
    DWORD       dwAlphaBltSurfaceBitDepths;     // DDBD_1,2,4,8
    DWORD       dwAlphaOverlayConstBitDepths;   // DDBD_2,4,8
    DWORD       dwAlphaOverlayPixelBitDepths;   // DDBD_1,2,4,8
    DWORD       dwAlphaOverlaySurfaceBitDepths; // DDBD_1,2,4,8
    DWORD       dwZBufferBitDepths;             // DDBD_8,16,24,32
    DWORD       dwVidMemTotal;          // total amount of video memory
    DWORD       dwVidMemFree;           // amount of free video memory
    DWORD       dwMaxVisibleOverlays;   // maximum number of visible overlays
    DWORD       dwCurrVisibleOverlays;  // current number of visible overlays
    DWORD       dwNumFourCCCodes;       // number of four cc codes
    DWORD       dwAlignBoundarySrc;     // source rectangle alignment
    DWORD       dwAlignSizeSrc;         // source rectangle byte size
    DWORD       dwAlignBoundaryDest;    // dest rectangle alignment
    DWORD       dwAlignSizeDest;        // dest rectangle byte size
    DWORD       dwAlignStrideAlign;     // stride alignment
    DWORD       dwRops[DD_ROP_SPACE];   // ROPS supported
    DDSCAPS     ddsCaps;                // DDSCAPS structure has all the general capabilities
    DWORD       dwMinOverlayStretch;    // minimum overlay stretch factor multiplied by 1000, eg 1000 == 1.0, 1300 == 1.3
    DWORD       dwMaxOverlayStretch;    // maximum overlay stretch factor multiplied by 1000, eg 1000 == 1.0, 1300 == 1.3
    DWORD       dwMinLiveVideoStretch;  // OBSOLETE! This field remains for compatability reasons only
    DWORD       dwMaxLiveVideoStretch;  // OBSOLETE! This field remains for compatability reasons only
    DWORD       dwMinHwCodecStretch;    // OBSOLETE! This field remains for compatability reasons only
    DWORD       dwMaxHwCodecStretch;    // OBSOLETE! This field remains for compatability reasons only
    DWORD       dwReserved1;            // reserved
    DWORD       dwReserved2;            // reserved
    DWORD       dwReserved3;            // reserved
} DDCAPS_DX1;

typedef DDCAPS_DX1 FAR* LPDDCAPS_DX1;

/*
 * This structure is the DDCAPS structure as it was in version 2 and 3 of Direct X.
 * It is present for back compatability.
 */
typedef struct _DDCAPS_DX3
{
    DWORD       dwSize;                 // size of the DDDRIVERCAPS structure
    DWORD       dwCaps;                 // driver specific capabilities
    DWORD       dwCaps2;                // more driver specific capabilites
    DWORD       dwCKeyCaps;             // color key capabilities of the surface
    DWORD       dwFXCaps;               // driver specific stretching and effects capabilites
    DWORD       dwFXAlphaCaps;          // alpha driver specific capabilities
    DWORD       dwPalCaps;              // palette capabilities
    DWORD       dwSVCaps;               // stereo vision capabilities
    DWORD       dwAlphaBltConstBitDepths;       // DDBD_2,4,8
    DWORD       dwAlphaBltPixelBitDepths;       // DDBD_1,2,4,8
    DWORD       dwAlphaBltSurfaceBitDepths;     // DDBD_1,2,4,8
    DWORD       dwAlphaOverlayConstBitDepths;   // DDBD_2,4,8
    DWORD       dwAlphaOverlayPixelBitDepths;   // DDBD_1,2,4,8
    DWORD       dwAlphaOverlaySurfaceBitDepths; // DDBD_1,2,4,8
    DWORD       dwZBufferBitDepths;             // DDBD_8,16,24,32
    DWORD       dwVidMemTotal;          // total amount of video memory
    DWORD       dwVidMemFree;           // amount of free video memory
    DWORD       dwMaxVisibleOverlays;   // maximum number of visible overlays
    DWORD       dwCurrVisibleOverlays;  // current number of visible overlays
    DWORD       dwNumFourCCCodes;       // number of four cc codes
    DWORD       dwAlignBoundarySrc;     // source rectangle alignment
    DWORD       dwAlignSizeSrc;         // source rectangle byte size
    DWORD       dwAlignBoundaryDest;    // dest rectangle alignment
    DWORD       dwAlignSizeDest;        // dest rectangle byte size
    DWORD       dwAlignStrideAlign;     // stride alignment
    DWORD       dwRops[DD_ROP_SPACE];   // ROPS supported
    DDSCAPS     ddsCaps;                // DDSCAPS structure has all the general capabilities
    DWORD       dwMinOverlayStretch;    // minimum overlay stretch factor multiplied by 1000, eg 1000 == 1.0, 1300 == 1.3
    DWORD       dwMaxOverlayStretch;    // maximum overlay stretch factor multiplied by 1000, eg 1000 == 1.0, 1300 == 1.3
    DWORD       dwMinLiveVideoStretch;  // minimum live video stretch factor multiplied by 1000, eg 1000 == 1.0, 1300 == 1.3
    DWORD       dwMaxLiveVideoStretch;  // maximum live video stretch factor multiplied by 1000, eg 1000 == 1.0, 1300 == 1.3
    DWORD       dwMinHwCodecStretch;    // minimum hardware codec stretch factor multiplied by 1000, eg 1000 == 1.0, 1300 == 1.3
    DWORD       dwMaxHwCodecStretch;    // maximum hardware codec stretch factor multiplied by 1000, eg 1000 == 1.0, 1300 == 1.3
    DWORD       dwReserved1;            // reserved
    DWORD       dwReserved2;            // reserved
    DWORD       dwReserved3;            // reserved
    DWORD       dwSVBCaps;              // driver specific capabilities for System->Vmem blts
    DWORD       dwSVBCKeyCaps;          // driver color key capabilities for System->Vmem blts
    DWORD       dwSVBFXCaps;            // driver FX capabilities for System->Vmem blts
    DWORD       dwSVBRops[DD_ROP_SPACE];// ROPS supported for System->Vmem blts
    DWORD       dwVSBCaps;              // driver specific capabilities for Vmem->System blts
    DWORD       dwVSBCKeyCaps;          // driver color key capabilities for Vmem->System blts
    DWORD       dwVSBFXCaps;            // driver FX capabilities for Vmem->System blts
    DWORD       dwVSBRops[DD_ROP_SPACE];// ROPS supported for Vmem->System blts
    DWORD       dwSSBCaps;              // driver specific capabilities for System->System blts
    DWORD       dwSSBCKeyCaps;          // driver color key capabilities for System->System blts
    DWORD       dwSSBFXCaps;            // driver FX capabilities for System->System blts
    DWORD       dwSSBRops[DD_ROP_SPACE];// ROPS supported for System->System blts
    DWORD       dwReserved4;            // reserved
    DWORD       dwReserved5;            // reserved
    DWORD       dwReserved6;            // reserved
} DDCAPS_DX3;