tile.cpp

著名SFC模拟器Snes9x的源代码。

    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N])) \
    { \
	if (SubDepth [N]) \
	{ \
	    if (SubDepth [N] != 1) \
		Screen [N] = COLOR_ADD (GFX.ScreenColors [Pixel], \
					Screen [GFX.Delta + N]); \
	    else \
		Screen [N] = COLOR_ADD (GFX.ScreenColors [Pixel], \
					GFX.FixedColour); \
	} \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_ADD1_2 (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N])) \
    { \
	if (SubDepth [N]) \
	{ \
	    if (SubDepth [N] != 1) \
		Screen [N] = (uint16) (COLOR_ADD1_2 (GFX.ScreenColors [Pixel], \
						     Screen [GFX.Delta + N])); \
	    else \
		Screen [N] = COLOR_ADD (GFX.ScreenColors [Pixel], \
					GFX.FixedColour); \
	} \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_FLIPPED_ADD1_2 (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N])) \
    { \
	if (SubDepth [N]) \
	{ \
	    if (SubDepth [N] != 1) \
		Screen [N] = (uint16) (COLOR_ADD1_2 (GFX.ScreenColors [Pixel], \
						     Screen [GFX.Delta + N])); \
	    else \
		Screen [N] = COLOR_ADD (GFX.ScreenColors [Pixel], \
					GFX.FixedColour); \
	} \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_SUB (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N])) \
    { \
	if (SubDepth [N]) \
	{ \
	    if (SubDepth [N] != 1) \
		Screen [N] = (uint16) COLOR_SUB (GFX.ScreenColors [Pixel], \
					Screen [GFX.Delta + N]); \
	    else \
		Screen [N] = (uint16) COLOR_SUB (GFX.ScreenColors [Pixel], \
					GFX.FixedColour); \
	} \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_FLIPPED_SUB (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N])) \
    { \
	if (SubDepth [N]) \
	{ \
	    if (SubDepth [N] != 1) \
		Screen [N] = (uint16) COLOR_SUB (GFX.ScreenColors [Pixel], \
					Screen [GFX.Delta + N]); \
	    else \
		Screen [N] = (uint16) COLOR_SUB (GFX.ScreenColors [Pixel], \
					GFX.FixedColour); \
	} \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_SUB1_2 (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N])) \
    { \
	if (SubDepth [N]) \
	{ \
	    if (SubDepth [N] != 1) \
		Screen [N] = (uint16) COLOR_SUB1_2 (GFX.ScreenColors [Pixel], \
					   Screen [GFX.Delta + N]); \
	    else \
		Screen [N] = (uint16) COLOR_SUB (GFX.ScreenColors [Pixel], \
					GFX.FixedColour); \
	} \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_FLIPPED_SUB1_2 (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N])) \
    { \
	if (SubDepth [N]) \
	{ \
	    if (SubDepth [N] != 1) \
		Screen [N] = (uint16) COLOR_SUB1_2 (GFX.ScreenColors [Pixel], \
					   Screen [GFX.Delta + N]); \
	    else \
		Screen [N] = (uint16) COLOR_SUB (GFX.ScreenColors [Pixel], \
					GFX.FixedColour); \
	} \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}


void DrawTile16Add (uint32 Tile, uint32 Offset, uint32 StartLine,
		    uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    RENDER_TILE(WRITE_4PIXELS16_ADD, WRITE_4PIXELS16_FLIPPED_ADD, 4)
}

void DrawClippedTile16Add (uint32 Tile, uint32 Offset,
			   uint32 StartPixel, uint32 Width,
			   uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    TILE_CLIP_PREAMBLE
    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_ADD, WRITE_4PIXELS16_FLIPPED_ADD, 4)
}

void DrawTile16Add1_2 (uint32 Tile, uint32 Offset, uint32 StartLine,
		       uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    RENDER_TILE(WRITE_4PIXELS16_ADD1_2, WRITE_4PIXELS16_FLIPPED_ADD1_2, 4)
}

void DrawClippedTile16Add1_2 (uint32 Tile, uint32 Offset,
			      uint32 StartPixel, uint32 Width,
			      uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    TILE_CLIP_PREAMBLE
    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_ADD1_2, WRITE_4PIXELS16_FLIPPED_ADD1_2, 4)
}

void DrawTile16Sub (uint32 Tile, uint32 Offset, uint32 StartLine,
		    uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    RENDER_TILE(WRITE_4PIXELS16_SUB, WRITE_4PIXELS16_FLIPPED_SUB, 4)
}

void DrawClippedTile16Sub (uint32 Tile, uint32 Offset,
			   uint32 StartPixel, uint32 Width,
			   uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    TILE_CLIP_PREAMBLE
    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_SUB, WRITE_4PIXELS16_FLIPPED_SUB, 4)
}

void DrawTile16Sub1_2 (uint32 Tile, uint32 Offset, uint32 StartLine,
		       uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    RENDER_TILE(WRITE_4PIXELS16_SUB1_2, WRITE_4PIXELS16_FLIPPED_SUB1_2, 4)
}

void DrawClippedTile16Sub1_2 (uint32 Tile, uint32 Offset,
			      uint32 StartPixel, uint32 Width,
			      uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    TILE_CLIP_PREAMBLE
    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_SUB1_2, WRITE_4PIXELS16_FLIPPED_SUB1_2, 4)
}

inline void WRITE_4PIXELS16_ADDF1_2 (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N])) \
    { \
	if (SubDepth [N] == 1) \
	    Screen [N] = (uint16) (COLOR_ADD1_2 (GFX.ScreenColors [Pixel], \
						 GFX.FixedColour)); \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel];\
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_FLIPPED_ADDF1_2 (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N])) \
    { \
	if (SubDepth [N] == 1) \
	    Screen [N] = (uint16) (COLOR_ADD1_2 (GFX.ScreenColors [Pixel], \
						 GFX.FixedColour)); \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel];\
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_SUBF1_2 (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[N])) \
    { \
	if (SubDepth [N] == 1) \
	    Screen [N] = (uint16) COLOR_SUB1_2 (GFX.ScreenColors [Pixel], \
						GFX.FixedColour); \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

inline void WRITE_4PIXELS16_FLIPPED_SUBF1_2 (uint32 Offset, uint8 *Pixels)
{
    uint32 Pixel;
    uint16 *Screen = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint8  *SubDepth = GFX.SubZBuffer + Offset;

#define FN(N) \
    if (GFX.Z1 > Depth [N] && (Pixel = Pixels[3 - N])) \
    { \
	if (SubDepth [N] == 1) \
	    Screen [N] = (uint16) COLOR_SUB1_2 (GFX.ScreenColors [Pixel], \
						GFX.FixedColour); \
	else \
	    Screen [N] = GFX.ScreenColors [Pixel]; \
	Depth [N] = GFX.Z2; \
    }

    FN(0)
    FN(1)
    FN(2)
    FN(3)

#undef FN
}

void DrawTile16FixedAdd1_2 (uint32 Tile, uint32 Offset, uint32 StartLine,
			    uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    RENDER_TILE(WRITE_4PIXELS16_ADDF1_2, WRITE_4PIXELS16_FLIPPED_ADDF1_2, 4)
}

void DrawClippedTile16FixedAdd1_2 (uint32 Tile, uint32 Offset,
				   uint32 StartPixel, uint32 Width,
				   uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    TILE_CLIP_PREAMBLE
    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_ADDF1_2, 
			WRITE_4PIXELS16_FLIPPED_ADDF1_2, 4)
}

void DrawTile16FixedSub1_2 (uint32 Tile, uint32 Offset, uint32 StartLine,
			    uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    RENDER_TILE(WRITE_4PIXELS16_SUBF1_2, WRITE_4PIXELS16_FLIPPED_SUBF1_2, 4)
}

void DrawClippedTile16FixedSub1_2 (uint32 Tile, uint32 Offset,
				   uint32 StartPixel, uint32 Width,
				   uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    TILE_CLIP_PREAMBLE
    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_SUBF1_2, 
			WRITE_4PIXELS16_FLIPPED_SUBF1_2, 4)
}

void DrawLargePixel16Add (uint32 Tile, uint32 Offset,
			  uint32 StartPixel, uint32 Pixels,
			  uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE

    register uint16 *sp = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint16 pixel;

#define LARGE_ADD_PIXEL(s, p) \
(Depth [z + GFX.DepthDelta] ? (Depth [z + GFX.DepthDelta] != 1 ? \
			       COLOR_ADD (p, *(s + GFX.Delta))    : \
			       COLOR_ADD (p, GFX.FixedColour)) \
			    : p)
			      
    RENDER_TILE_LARGE (GFX.ScreenColors [pixel], LARGE_ADD_PIXEL)
}

void DrawLargePixel16Add1_2 (uint32 Tile, uint32 Offset,
			     uint32 StartPixel, uint32 Pixels,
			     uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE

    register uint16 *sp = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint16 pixel;

#define LARGE_ADD_PIXEL1_2(s, p) \
((uint16) (Depth [z + GFX.DepthDelta] ? (Depth [z + GFX.DepthDelta] != 1 ? \
			       COLOR_ADD1_2 (p, *(s + GFX.Delta))    : \
			       COLOR_ADD (p, GFX.FixedColour)) \
			    : p))
			      
    RENDER_TILE_LARGE (GFX.ScreenColors [pixel], LARGE_ADD_PIXEL1_2)
}

void DrawLargePixel16Sub (uint32 Tile, uint32 Offset,
			  uint32 StartPixel, uint32 Pixels,
			  uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE

    register uint16 *sp = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint16 pixel;

#define LARGE_SUB_PIXEL(s, p) \
(Depth [z + GFX.DepthDelta] ? (Depth [z + GFX.DepthDelta] != 1 ? \
			       COLOR_SUB (p, *(s + GFX.Delta))    : \
			       COLOR_SUB (p, GFX.FixedColour)) \
			    : p)
			      
    RENDER_TILE_LARGE (GFX.ScreenColors [pixel], LARGE_SUB_PIXEL)
}

void DrawLargePixel16Sub1_2 (uint32 Tile, uint32 Offset,
			     uint32 StartPixel, uint32 Pixels,
			     uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE

    register uint16 *sp = (uint16 *) GFX.S + Offset;
    uint8  *Depth = GFX.ZBuffer + Offset;
    uint16 pixel;

#define LARGE_SUB_PIXEL1_2(s, p) \
(Depth [z + GFX.DepthDelta] ? (Depth [z + GFX.DepthDelta] != 1 ? \
			       COLOR_SUB1_2 (p, *(s + GFX.Delta))    : \
			       COLOR_SUB (p, GFX.FixedColour)) \
			    : p)
			      
    RENDER_TILE_LARGE (GFX.ScreenColors [pixel], LARGE_SUB_PIXEL1_2)
}

#ifdef USE_GLIDE
#if 0
void DrawTile3dfx (uint32 Tile, uint32 Offset, uint32 StartLine,
		   uint32 LineCount)
{
    TILE_PREAMBLE

    float x = Offset % GFX.Pitch;
    float y = Offset / GFX.Pitch;

    Glide.sq [0].x = Glide.x_offset + x * Glide.x_scale;
    Glide.sq [0].y = Glide.y_offset + y * Glide.y_scale;
    Glide.sq [1].x = Glide.x_offset + (x + 8.0) * Glide.x_scale;
    Glide.sq [1].y = Glide.y_offset + y * Glide.y_scale;
    Glide.sq [2].x = Glide.x_offset + (x + 8.0) * Glide.x_scale;
    Glide.sq [2].y = Glide.y_offset + (y + LineCount) * Glide.y_scale;
    Glide.sq [3].x = Glide.x_offset + x * Glide.x_scale;
    Glide.sq [3].y = Glide.y_offset + (y + LineCount) * Glide.y_scale;

    if (!(Tile & (V_FLIP | H_FLIP)))
    {
	// Normal
	Glide.sq [0].tmuvtx [0].sow = 0.0;
	Glide.sq [0].tmuvtx [0].tow = StartLine;
	Glide.sq [1].tmuvtx [0].sow = 8.0;
	Glide.sq [1].tmuvtx [0].tow = StartLine;
	Glide.sq [2].tmuvtx [0].sow = 8.0;
	Glide.sq [2].tmuvtx [0].tow = StartLine + LineCount;
	Glide.sq [3].tmuvtx [0].sow = 0.0;
	Glide.sq [3].tmuvtx [0].tow = StartLine + LineCount;
    }
    else
    if (!(Tile & V_FLIP))
    {
	// Flipped
	Glide.sq [0].tmuvtx [0].sow = 8.0;
	Glide.sq [0].tmuvtx [0].tow = StartLine;
	Glide.sq [1].tmuvtx [0].sow = 0.0;
	Glide.sq [1].tmuvtx [0].tow = StartLine;
	Glide.sq [2].tmuvtx [0].sow = 0.0;
	Glide.sq [2].tmuvtx [0].tow = StartLine + LineCount;
	Glide.sq [3].tmuvtx [0].sow = 8.0;
	Glide.sq [3].tmuvtx [0].tow = StartLine + LineCount;
    }
    else
    if (Tile & H_FLIP)
    {
	// Horizontal and vertical flip
	Glide.sq [0].tmuvtx [0].sow = 8.0;
	Glide.sq [0].tmuvtx [0].tow = StartLine + LineCount;
	Glide.sq [1].tmuvtx [0].sow = 0.0;
	Glide.sq [1].tmuvtx [0].tow = StartLine + LineCount;
	Glide.sq [2].tmuvtx [0].sow = 0.0;
	Glide.sq [2].tmuvtx [0].tow = StartLine;
	Glide.sq [3].tmuvtx [0].sow = 8.0;
	Glide.sq [3].tmuvtx [0].tow = StartLine;
    }
    else
    {
	// Vertical flip only
	Glide.sq [0].tmuvtx [0].sow = 0.0;
	Glide.sq [0].tmuvtx [0].tow = StartLine + LineCount;
	Glide.sq [1].tmuvtx [0].sow = 8.0;
	Glide.sq [1].tmuvtx [0].tow = StartLine + LineCount;
	Glide.sq [2].tmuvtx [0].sow = 8.0;
	Glide.sq [2].tmuvtx [0].tow = StartLine;
	Glide.sq [3].tmuvtx [0].sow = 0.0;
	Glide.sq [3].tmuvtx [0].tow = StartLine;
    }
    grTexDownloadMipMapLevel (GR_TMU0, Glide.texture_mem_start,
			      GR_LOD_8, GR_LOD_8, GR_ASPECT_1x1,
			      GR_TEXFMT_RGB_565,
			      GR_MIPMAPLEVELMASK_BOTH,
			      (void *) pCache);
    grTexSource (GR_TMU0, Glide.texture_mem_start,
		 GR_MIPMAPLEVELMASK_BOTH, &Glide.texture);
    grDrawTriangle (&Glide.sq [0], &Glide.sq [3], &Glide.sq [2]);
    grDrawTriangle (&Glide.sq [0], &Glide.sq [1], &Glide.sq [2]);
}

void DrawClippedTile3dfx (uint32 Tile, uint32 Offset,
			  uint32 StartPixel, uint32 Width,
			  uint32 StartLine, uint32 LineCount)
{
    TILE_PREAMBLE
    register uint8 *bp;

    TILE_CLIP_PREAMBLE
    RENDER_CLIPPED_TILE(WRITE_4PIXELS16_SUB, WRITE_4PIXELS16_FLIPPED_SUB, 4)
}
#endif
#endif