gfx.cpp

著名SFC模拟器Snes9x的源代码。

		    else
		    if (Quot == 63)
			t = b1;
		}
		else
		{
		    t += Quot & 1;
		    if (Quot == 63)
			t = b2;
		    else
		    if (Quot == 127)
			t = b1;
		}
	    }
	    // Right-hand edge clipped tiles
	    if (Count)
	    {
		Tile = READ_2BYTES(t);
		GFX.Z1 = GFX.Z2 = depths [(Tile & 0x2000) >> 13];

		if (BG.TileSize == 8)
		    (*DrawClippedTilePtr) (Tile, s, 0, Count, VirtAlign, 
					   Lines);
		else
		{
		    if (!(Tile & (V_FLIP | H_FLIP)))
		    {
			// Normal, unflipped
			(*DrawClippedTilePtr) (Tile + t1 + (Quot & 1), s, 0, 
					       Count, VirtAlign, Lines);
		    }
		    else
		    if (Tile & H_FLIP)
		    {
			if (Tile & V_FLIP)
			{
			    // H & V flip
			    (*DrawClippedTilePtr) (Tile + t2 + 1 - (Quot & 1),
						   s, 0, Count, VirtAlign, 
						   Lines);
			}
			else
			{
			    // H flip only
			    (*DrawClippedTilePtr) (Tile + t1 + 1 - (Quot & 1),
						   s, 0, Count, VirtAlign,
						   Lines);
			}
		    }
		    else
		    {
			// V flip only
			(*DrawClippedTilePtr) (Tile + t2 + (Quot & 1),
					       s, 0, Count, VirtAlign, 
					       Lines);
		    }
		}
	    }
	}
    }
}

#define RENDER_BACKGROUND_MODE7(TYPE,FUNC) \
    CHECK_SOUND(); \
\
    uint8 *VRAM1 = Memory.VRAM + 1; \
    if (GFX.r2130 & 1) \
    { \
	if (IPPU.DirectColourMapsNeedRebuild) \
	    S9xBuildDirectColourMaps (); \
	GFX.ScreenColors = DirectColourMaps [0]; \
    } \
    else \
	GFX.ScreenColors = IPPU.ScreenColors; \
\
    int aa, cc; \
    int dir; \
    int startx, endx; \
    uint32 Left = 0; \
    uint32 Right = 256; \
    uint32 ClipCount = GFX.pCurrentClip->Count [bg]; \
\
    if (!ClipCount) \
	ClipCount = 1; \
\
    Screen += GFX.StartY * GFX.Pitch; \
    uint8 *Depth = GFX.DB + GFX.StartY * GFX.PPL; \
    struct SLineMatrixData *l = &LineMatrixData [GFX.StartY]; \
\
    for (uint32 Line = GFX.StartY; Line <= GFX.EndY; Line++, Screen += GFX.Pitch, Depth += GFX.PPL, l++) \
    { \
	int yy; \
\
	int32 HOffset = ((int32) LineData [Line].BG[0].HOffset << M7) >> M7; \
	int32 VOffset = ((int32) LineData [Line].BG[0].VOffset << M7) >> M7; \
\
	int32 CentreX = ((int32) l->CentreX << M7) >> M7; \
	int32 CentreY = ((int32) l->CentreY << M7) >> M7; \
\
	if (PPU.Mode7VFlip) \
	    yy = 261 - (int) Line; \
	else \
	    yy = Line; \
\
	if (PPU.Mode7Repeat == 0) \
	    yy += (VOffset - CentreY) % 1023; \
	else \
	    yy += VOffset - CentreY; \
	int BB = l->MatrixB * yy + (CentreX << 8); \
	int DD = l->MatrixD * yy + (CentreY << 8); \
\
	for (uint32 clip = 0; clip < ClipCount; clip++) \
	{ \
	    if (GFX.pCurrentClip->Count [bg]) \
	    { \
		Left = GFX.pCurrentClip->Left [clip][bg]; \
		Right = GFX.pCurrentClip->Right [clip][bg]; \
		if (Right <= Left) \
		    continue; \
	    } \
	    TYPE *p = (TYPE *) Screen + Left; \
	    uint8 *d = Depth + Left; \
\
	    if (PPU.Mode7HFlip) \
	    { \
		startx = Right - 1; \
		endx = Left - 1; \
		dir = -1; \
		aa = -l->MatrixA; \
		cc = -l->MatrixC; \
	    } \
	    else \
	    { \
		startx = Left; \
		endx = Right; \
		dir = 1; \
		aa = l->MatrixA; \
		cc = l->MatrixC; \
	    } \
	    int xx; \
	    if (PPU.Mode7Repeat == 0) \
		xx = startx + (HOffset - CentreX) % 1023; \
	    else \
		xx = startx + HOffset - CentreX; \
	    int AA = l->MatrixA * xx; \
	    int CC = l->MatrixC * xx; \
\
	    if (!PPU.Mode7Repeat) \
	    { \
		for (int x = startx; x != endx; x += dir, AA += aa, CC += cc, p++, d++) \
		{ \
		    int X = ((AA + BB) >> 8) & 0x3ff; \
		    int Y = ((CC + DD) >> 8) & 0x3ff; \
		    uint8 *TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7); \
		    uint32 b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1)); \
		    GFX.Z1 = Mode7Depths [(b & GFX.Mode7PriorityMask) >> 7]; \
		    if (GFX.Z1 > *d && b) \
		    { \
			*p = (FUNC); \
			*d = GFX.Z1; \
		    } \
		} \
	    } \
	    else \
	    { \
		for (int x = startx; x != endx; x += dir, AA += aa, CC += cc, p++, d++) \
		{ \
		    int X = ((AA + BB) >> 8); \
		    int Y = ((CC + DD) >> 8); \
\
		    if (Settings.Dezaemon && PPU.Mode7Repeat == 2) \
		    { \
			X &= 0x7ff; \
			Y &= 0x7ff; \
		    } \
\
		    if (((X | Y) & ~0x3ff) == 0) \
		    { \
			uint8 *TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7); \
			uint32 b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1)); \
			GFX.Z1 = Mode7Depths [(b & GFX.Mode7PriorityMask) >> 7]; \
			if (GFX.Z1 > *d && b) \
			{ \
			    *p = (FUNC); \
			    *d = GFX.Z1; \
			} \
		    } \
		    else \
		    { \
			if (PPU.Mode7Repeat == 3) \
			{ \
			    X = (x + HOffset) & 7; \
			    Y = (yy + CentreY) & 7; \
			    uint32 b = *(VRAM1 + ((Y & 7) << 4) + ((X & 7) << 1)); \
			    GFX.Z1 = Mode7Depths [(b & GFX.Mode7PriorityMask) >> 7]; \
			    if (GFX.Z1 > *d && b) \
			    { \
				*p = (FUNC); \
				*d = GFX.Z1; \
			    } \
			} \
		    } \
		} \
	    } \
	} \
    }

#if 0
#define _BUILD_SETUP(F) \
GFX.BuildPixel = BuildPixel##F; \
GFX.BuildPixel2 = BuildPixel2##F; \
GFX.DecomposePixel = DecomposePixel##F; \
RED_LOW_BIT_MASK = RED_LOW_BIT_MASK_##F; \
GREEN_LOW_BIT_MASK = GREEN_LOW_BIT_MASK_##F; \
BLUE_LOW_BIT_MASK = BLUE_LOW_BIT_MASK_##F; \
RED_HI_BIT_MASK = RED_HI_BIT_MASK_##F; \
GREEN_HI_BIT_MASK = GREEN_HI_BIT_MASK_##F; \
BLUE_HI_BIT_MASK = BLUE_HI_BIT_MASK_##F; \
MAX_RED = MAX_RED_##F; \
MAX_GREEN = MAX_GREEN_##F; \
MAX_BLUE = MAX_BLUE_##F; \
GREEN_HI_BIT = ((MAX_GREEN_##F + 1) >> 1); \
SPARE_RGB_BIT_MASK = SPARE_RGB_BIT_MASK_##F; \
RGB_LOW_BITS_MASK = (RED_LOW_BIT_MASK_##F | \
 		     GREEN_LOW_BIT_MASK_##F | \
		     BLUE_LOW_BIT_MASK_##F); \
RGB_HI_BITS_MASK = (RED_HI_BIT_MASK_##F | \
		    GREEN_HI_BIT_MASK_##F | \
		    BLUE_HI_BIT_MASK_##F); \
RGB_HI_BITS_MASKx2 = ((RED_HI_BIT_MASK_##F | \
		       GREEN_HI_BIT_MASK_##F | \
		       BLUE_HI_BIT_MASK_##F) << 1); \
RGB_REMOVE_LOW_BITS_MASK = ~RGB_LOW_BITS_MASK;
#endif

void DrawBGMode7Background (uint8 *Screen, int bg)
{
    RENDER_BACKGROUND_MODE7 (uint8, (uint8) (b & GFX.Mode7Mask))
}

void DrawBGMode7Background16 (uint8 *Screen, int bg)
{
    RENDER_BACKGROUND_MODE7 (uint16, GFX.ScreenColors [b & GFX.Mode7Mask]);
}

void DrawBGMode7Background16Add (uint8 *Screen, int bg)
{
    RENDER_BACKGROUND_MODE7 (uint16, *(d + GFX.DepthDelta) ?
					(*(d + GFX.DepthDelta) != 1 ?
					    COLOR_ADD (GFX.ScreenColors [b & GFX.Mode7Mask],
						       p [GFX.Delta]) :
					    COLOR_ADD (GFX.ScreenColors [b & GFX.Mode7Mask],
						       GFX.FixedColour)) :
					 GFX.ScreenColors [b & GFX.Mode7Mask]);
}

void DrawBGMode7Background16Add1_2 (uint8 *Screen, int bg)
{
    RENDER_BACKGROUND_MODE7 (uint16, *(d + GFX.DepthDelta) ?
					(*(d + GFX.DepthDelta) != 1 ?
					    COLOR_ADD1_2 (GFX.ScreenColors [b & GFX.Mode7Mask],
						       p [GFX.Delta]) :
					    COLOR_ADD (GFX.ScreenColors [b & GFX.Mode7Mask],
						       GFX.FixedColour)) :
					 GFX.ScreenColors [b & GFX.Mode7Mask]);
}

void DrawBGMode7Background16Sub (uint8 *Screen, int bg)
{
    RENDER_BACKGROUND_MODE7 (uint16, *(d + GFX.DepthDelta) ?
					(*(d + GFX.DepthDelta) != 1 ?
					    COLOR_SUB (GFX.ScreenColors [b & GFX.Mode7Mask],
						       p [GFX.Delta]) :
					    COLOR_SUB (GFX.ScreenColors [b & GFX.Mode7Mask],
						       GFX.FixedColour)) :
					 GFX.ScreenColors [b & GFX.Mode7Mask]);
}

void DrawBGMode7Background16Sub1_2 (uint8 *Screen, int bg)
{
    RENDER_BACKGROUND_MODE7 (uint16, *(d + GFX.DepthDelta) ?
					(*(d + GFX.DepthDelta) != 1 ?
					    COLOR_SUB1_2 (GFX.ScreenColors [b & GFX.Mode7Mask],
						       p [GFX.Delta]) :
					    COLOR_SUB (GFX.ScreenColors [b & GFX.Mode7Mask],
						       GFX.FixedColour)) :
					 GFX.ScreenColors [b & GFX.Mode7Mask]);
}

#define RENDER_BACKGROUND_MODE7_i(TYPE,FUNC,COLORFUNC) \
    CHECK_SOUND(); \
\
    uint8 *VRAM1 = Memory.VRAM + 1; \
    if (GFX.r2130 & 1) \
    { \
        if (IPPU.DirectColourMapsNeedRebuild) \
            S9xBuildDirectColourMaps (); \
        GFX.ScreenColors = DirectColourMaps [0]; \
    } \
    else \
        GFX.ScreenColors = IPPU.ScreenColors; \
    \
    int aa, cc; \
    int dir; \
    int startx, endx; \
    uint32 Left = 0; \
    uint32 Right = 256; \
    uint32 ClipCount = GFX.pCurrentClip->Count [bg]; \
    \
    if (!ClipCount) \
        ClipCount = 1; \
    \
    Screen += GFX.StartY * GFX.Pitch; \
    uint8 *Depth = GFX.DB + GFX.StartY * GFX.PPL; \
    struct SLineMatrixData *l = &LineMatrixData [GFX.StartY]; \
    bool8 allowSimpleCase = FALSE; \
    if (!l->MatrixB && !l->MatrixC && (l->MatrixA == 0x0100) && (l->MatrixD == 0x0100) \
        && !LineMatrixData[GFX.EndY].MatrixB && !LineMatrixData[GFX.EndY].MatrixC \
        && (LineMatrixData[GFX.EndY].MatrixA == 0x0100) && (LineMatrixData[GFX.EndY].MatrixD == 0x0100) \
        ) \
        allowSimpleCase = TRUE;  \
    \
    for (uint32 Line = GFX.StartY; Line <= GFX.EndY; Line++, Screen += GFX.Pitch, Depth += GFX.PPL, l++) \
    { \
        int yy; \
        \
        int HOffset = ((int) LineData [Line].BG[0].HOffset << M7) >> M7; \
        int VOffset = ((int) LineData [Line].BG[0].VOffset << M7) >> M7; \
        \
        int CentreX = ((int) l->CentreX << M7) >> M7; \
        int CentreY = ((int) l->CentreY << M7) >> M7; \
        \
        if (PPU.Mode7VFlip) \
            yy = 261 - (int) Line; \
        else \
            yy = Line; \
        \
	if (PPU.Mode7Repeat == 0) \
	    yy += (VOffset - CentreY) % 1023; \
	else \
	    yy += VOffset - CentreY; \
        bool8 simpleCase = FALSE; \
        int BB; \
        int DD; \
        /* Make a special case for the identity matrix, since it's a common case and */ \
        /* can be done much more quickly without special effects */ \
        if (allowSimpleCase && !l->MatrixB && !l->MatrixC && (l->MatrixA == 0x0100) && (l->MatrixD == 0x0100)) \
        { \
            BB = CentreX << 8; \
            DD = (yy + CentreY) << 8; \
            simpleCase = TRUE; \
        } \
        else \
        { \
            BB = l->MatrixB * yy + (CentreX << 8); \
            DD = l->MatrixD * yy + (CentreY << 8); \
        } \
        \
        for (uint32 clip = 0; clip < ClipCount; clip++) \
        { \
            if (GFX.pCurrentClip->Count [bg]) \
            { \
                Left = GFX.pCurrentClip->Left [clip][bg]; \
                Right = GFX.pCurrentClip->Right [clip][bg]; \
                if (Right <= Left) \
                    continue; \
            } \
            TYPE *p = (TYPE *) Screen + Left; \
            uint8 *d = Depth + Left; \
            \
            if (PPU.Mode7HFlip) \
            { \
                startx = Right - 1; \
                endx = Left - 1; \
                dir = -1; \
                aa = -l->MatrixA; \
                cc = -l->MatrixC; \
            } \
            else \
            { \
                startx = Left; \
                endx = Right; \
                dir = 1; \
                aa = l->MatrixA; \
                cc = l->MatrixC; \
            } \
            int xx; \
	    if (PPU.Mode7Repeat == 0) \
		xx = startx + (HOffset - CentreX) % 1023; \
	    else \
		xx = startx + HOffset - CentreX; \
            int AA, CC = 0; \
            if (simpleCase) \
            { \
                AA = xx << 8; \
            } \
            else \
            { \
                AA = l->MatrixA * xx; \
                CC = l->MatrixC * xx; \
            } \
            if (simpleCase) \
            { \
                if (!PPU.Mode7Repeat) \
                { \
                    int x = 0; \
                    int theEnd = Right - Left; \
                    do \
                    { \
                        int X = ((AA + BB) >> 8) & 0x3ff; \
                        int Y = (DD >> 8) & 0x3ff; \
                        uint8 *TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7); \
                        uint32 b; \
                        if ((GFX.Z1 > *d) && (b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1)))) \
                        { \
                            TYPE theColor = COLORFUNC; \
                            *p = (FUNC); \
                            *d = GFX.Z2; \
                        } \
                        AA += aa, p++, d++; \
			x += dir; \
                    } while (x != theEnd); \
                } \
                else \
                { \
                    int x = startx; \
                    do { \
                        int X = (AA + BB) >> 8; \
                        int Y = DD >> 8; \
\
			if(Settings.Dezaemon && PPU.Mode7Repeat == 2) \
			{ \
			    X &= 0x7ff; \
			    Y &= 0x7ff; \
			} \
\
                        if (((X | Y) & ~0x3ff) == 0) \
                        { \
                            uint8 *TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7); \
                            uint32 b; \
                            if ((GFX.Z1 > *d) && (b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1)))) \
                            { \
                                *p = COLORFUNC; \
                                *d = GFX.Z2; \
                            } \
                        } \
                        else if (PPU.Mode7Repeat == 3) \
                        { \
                            X = (x + HOffset) & 7; \
                            Y = (yy + CentreY) & 7; \
                            uint32 b; \
                            if (GFX.Z1 > *d && \
                                (b = *(VRAM1 + ((Y & 7) << 4) + ((X & 7) << 1)))) \
                            { \
                                TYPE theColor = COLORFUNC; \
                                *p = (FUNC); \
                                *d = GFX.Z2; \
                            } \
                        } \
                        AA += aa, p++, d++; \
			x += dir; \
                    } while (x != endx); \
                } \
            } \
            else if (!PPU.Mode7Repeat) \
            { \
                /* The bilinear interpolator: get the colors at the four points surrounding */ \
                /* the location of one point in the _sampled_ image, and weight them according */ \
                /* to their (city block) distance.  It's very smooth, but blurry with "close up" */ \
                /* points. */ \
                \
                /* 460 (slightly less than 2 source pixels per displayed pixel) is an educated */ \
                /* guess for where bilinear filtering will become a poor method for averaging. */ \
                /* (When reducing the image, the weighting used by a bilinear filter becomes */ \
                /* arbitrary, and a simple mean is a better way to represent the source image.) */ \
                /* You can think of this as a kind of mipmapping. */ \
                if ((aa < 460 && aa > -460) && (cc < 460 && cc > -460)) \
                {\
                    for (int x = startx; x != endx; x += dir, AA += aa, CC += cc, p++, d++) \
                    { \
                        uint32 xPos = AA + BB; \
                        uint32 xPix = xPos >> 8; \
                        uint32 yPos = CC + DD; \
                        uint32 yPix = yPos >> 8; \
                        uint32 X = xPix & 0x3ff; \
                        uint32 Y = yPix & 0x3ff; \
                        uint8 *TileData = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X >> 2) & ~1)] << 7); \
                        uint32 b; \
                        if ((GFX.Z1 > *d) &&\
                            (b = *(TileData + ((Y & 7) << 4) + ((X & 7) << 1)))) \
                        { \
                            /* X10 and Y01 are the X and Y coordinates of the next source point over. */ \
                            uint32 X10 = (xPix + dir) & 0x3ff; \
                            uint32 Y01 = (yPix + dir) & 0x3ff; \
                            uint8 *TileData10 = VRAM1 + (Memory.VRAM[((Y & ~7) << 5) + ((X10 >> 2) & ~1)] << 7); \
                            uint8 *TileData11 = VRAM1 + (Memory.VRAM[((Y01 & ~7) << 5) + ((X10 >> 2) & ~1)] << 7); \
                            uint8 *TileData01 = VRAM1 + (Memory.VRAM[((Y01 & ~7) << 5) + ((X >> 2) & ~1)] << 7); \
                            uint32 p1 = COLORFUNC; \
                            p1 = (p1 & FIRST_THIRD_COLOR_MASK) | ((p1 & SECOND_COLOR_MASK) << 16); \
                            b = *(TileData10 + ((Y & 7) << 4) + ((X10 & 7) << 1)); \
                            uint32 p2 = COLORFUNC; \
                            p2 = (p2 & FIRST_THIRD_COLOR_MASK) | ((p2 & SECOND_COLOR_MASK) << 16); \
                            b = *(TileData11 + ((Y01 & 7) << 4) + ((X10 & 7) << 1)); \
                            uint32 p4 = COLORFUNC; \
                            p4 = (p4 & FIRST_THIRD_COLOR_MASK) | ((p4 & SECOND_COLOR_MASK) << 16); \
                            b = *(TileData01 + ((Y01 & 7) << 4) + ((X & 7) << 1)); \
                            uint32 p3 = COLORFUNC; \
                            p3 = (p3 & FIRST_THIRD_COLOR_MASK) | ((p3 & SECOND_COLOR_MASK) << 16); \
                            /* Xdel, Ydel: position (in 1/32nds) between the points */ \
                            uint32 Xdel = (xPos >> 3) & 0x1F; \
                            uint32 Ydel = (yPos >> 3) & 0x1F; \
                            uint32 XY = (Xdel*Ydel) >> 5; \
                            uint32 area1 = 0x20 + XY - Xdel - Ydel; \
                            uint32 area2 = Xdel - XY; \
                            uint32 area3 = Ydel - XY; \
                            uint32 area4 = XY; \
                            uint32 tempColor = ((area1 * p1) + \
                                                (area2 * p2) + \
                                                (area3 * p3) + \
                                                (area4 * p4)) >> 5; \
                            TYPE theColor = (tempColor & FIRST_THIRD_COLOR_MASK) | ((tempColor >> 16) & SECOND_COLOR_MASK); \
                            *p = (FUNC); \
                            *d = GFX.Z2; \
                        } \
                    } \
                } \
                else \
                    /* The oversampling method: get the colors at four corners of a square */ \
                    /* in the _displayed_ image, and average them.  It's sharp and clean, but */ \
                    /* gives the usual huge pixels when the source image gets "close." */ \
                { \
                    /* Find the dimensions of the square in the source image whose corners will be examined. */ \