Source code of Windows XP (NT5)
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/******************************Module*Header*******************************\
* Module Name: span_t.h ** ** This include file is used to generate various flavors of textured ** spans, or scanlines. The variations cover only RGB operation, ** dithering, and pixel-depth. Not your typical include file. ** ** Created: 11-April-1994 ** Author: Otto Berkes [ottob] ** ** Copyright (c) 1994 Microsoft Corporation *\**************************************************************************/
void
#if DITHER
#if (BPP == 8)
__fastGenTex8DithSmoothSpan(__GLGENcontext *gengc)#elif (BPP == 16)
__fastGenTex16DithSmoothSpan(__GLGENcontext *gengc)#elif (BPP == 24)
__fastGenTex24DithSmoothSpan(__GLGENcontext *gengc)#else
__fastGenTex32DithSmoothSpan(__GLGENcontext *gengc)#endif
#else //!DITHER
#if (BPP == 8)
__fastGenTex8SmoothSpan(__GLGENcontext *gengc)#elif (BPP == 16)
__fastGenTex16SmoothSpan(__GLGENcontext *gengc)#elif (BPP == 24)
__fastGenTex24SmoothSpan(__GLGENcontext *gengc)#else
__fastGenTex32SmoothSpan(__GLGENcontext *gengc)#endif
#endif //!DITHER
{ ULONG rAccum; ULONG gAccum; ULONG bAccum; ULONG sAccum; ULONG tAccum; LONG rDelta; LONG gDelta; LONG bDelta; LONG sDelta; LONG tDelta; ULONG rShift; ULONG gShift; ULONG bShift; ULONG rtShift; ULONG gtShift; ULONG btShift; ULONG tShift; ULONG sMask, tMask; ULONG wLog2; ULONG hLog2; GENACCEL *pGenAccel; __GLcolorBuffer *cfb; BYTE *pPix; UCHAR *texAddr; USHORT *texBits;#if DITHER
ULONG ditherVal;#endif
#if (BPP == 8)
BYTE *pXlat;#endif
ULONG *pMask;#if DITHER
ULONG ditherShift; ULONG ditherRow;#endif
LONG count; LONG totalCount; __GLtexture *tex = ((__GLcontext *)gengc)->texture.currentTexture;
wLog2 = tex->level[0].widthLog2; hLog2 = tex->level[0].heightLog2; sMask = (~(~0 << wLog2)) << 16; tMask = (~(~0 << hLog2)) << 16; tShift = 13 - wLog2; // get color deltas and accumulators
pGenAccel = (GENACCEL *)(gengc->pPrivateArea);
texAddr = (UCHAR *)pGenAccel->texImage;
rDelta = pGenAccel->spanDelta.r; gDelta = pGenAccel->spanDelta.g; bDelta = pGenAccel->spanDelta.b; sDelta = pGenAccel->spanDelta.s; tDelta = pGenAccel->spanDelta.t;
rAccum = pGenAccel->spanValue.r; gAccum = pGenAccel->spanValue.g; bAccum = pGenAccel->spanValue.b; sAccum = pGenAccel->spanValue.s; tAccum = pGenAccel->spanValue.t;
cfb = gengc->gc.polygon.shader.cfb;
rShift = cfb->redShift; gShift = cfb->greenShift; bShift = cfb->blueShift;#if DITHER
rtShift = 8 + ((__GLcontext *)gengc)->modes.redBits; gtShift = 8 + ((__GLcontext *)gengc)->modes.greenBits; btShift = 8 + ((__GLcontext *)gengc)->modes.blueBits;#else
rtShift = 16 + ((__GLcontext *)gengc)->modes.redBits; gtShift = 16 + ((__GLcontext *)gengc)->modes.greenBits; btShift = 16 + ((__GLcontext *)gengc)->modes.blueBits;#endif
// get address of destination
if (pGenAccel->flags & SURFACE_TYPE_DIB) { int xScr; int yScr;
xScr = gengc->gc.polygon.shader.frag.x - gengc->gc.constants.viewportXAdjust + cfb->buf.xOrigin; yScr = gengc->gc.polygon.shader.frag.y - gengc->gc.constants.viewportYAdjust + cfb->buf.yOrigin;
pPix = (BYTE *)cfb->buf.base + (yScr * cfb->buf.outerWidth) +#if (BPP == 8)
xScr;#elif (BPP == 16)
(xScr << 1);#elif (BPP == 24)
xScr + (xScr << 1);#else
(xScr << 2);#endif //BPP
} else pPix = gengc->ColorsBits;
// set up pointer to translation table as needed
#if (BPP == 8)
pXlat = gengc->pajTranslateVector;#endif
#if DITHER
ditherRow = Dither_4x4[gengc->gc.polygon.shader.frag.y & 0x3]; ditherShift = (gengc->gc.polygon.shader.frag.x & 0x3) << 3;#endif
pMask = gengc->gc.polygon.shader.stipplePat; if ((totalCount = count = gengc->gc.polygon.shader.length) > 32) count = 32;
for (; totalCount > 0; totalCount -= 32) { ULONG mask; ULONG maskTest; if ((mask = *pMask++) == 0) { rAccum += (rDelta << 5); gAccum += (gDelta << 5); bAccum += (bDelta << 5); sAccum += (sDelta << 5); tAccum += (tDelta << 5);
pPix += (32 * (BPP / 8)); continue; }
maskTest = 0x80000000;
if ((count = totalCount) > 32) count = 32;
for (; count; count--, maskTest >>= 1) { if (mask & maskTest) { DWORD color;
texBits = (USHORT *)(texAddr + ((sAccum & sMask) >> 13) + ((tAccum & tMask) >> tShift));
#if DITHER
ditherVal = (ditherRow >> ditherShift) & 0xff;
ditherShift = (ditherShift + 8) & 0x18;
color = ((((((ULONG)texBits[0] * (rAccum >> 8)) >> rtShift) + ditherVal) >> 8) << rShift) | ((((((ULONG)texBits[1] * (gAccum >> 8)) >> gtShift) + ditherVal) >> 8) << gShift) | ((((((ULONG)texBits[2] * (bAccum >> 8)) >> btShift) + ditherVal) >> 8) << bShift);#else
color = ((((ULONG)texBits[0] * (rAccum >> 8)) >> rtShift) << rShift) | ((((ULONG)texBits[1] * (gAccum >> 8)) >> gtShift) << gShift) | ((((ULONG)texBits[2] * (bAccum >> 8)) >> btShift) << bShift);#endif
#if (BPP == 8)
// XXX the color value should *not* have to be masked!
color = *(pXlat + (color & 0xff));#endif
#if (BPP == 8)
*pPix = (BYTE)color;#elif (BPP == 16)
*((WORD *)pPix) = (USHORT)color;#elif (BPP == 24)
*pPix = (BYTE)color; *(pPix + 1) = (BYTE)(color >> 8); *(pPix + 2) = (BYTE)(color >> 16);#else
*((DWORD *)pPix) = color;#endif //BPP
} rAccum += rDelta; gAccum += gDelta; bAccum += bDelta; sAccum += sDelta; tAccum += tDelta;
pPix += (BPP / 8); } }}
void
#if DITHER
#if (BPP == 8)
__fastGenTex8DithDecalSpan(__GLGENcontext *gengc)#elif (BPP == 16)
__fastGenTex16DithDecalSpan(__GLGENcontext *gengc)#elif (BPP == 24)
__fastGenTex24DithDecalSpan(__GLGENcontext *gengc)#else
__fastGenTex32DithDecalSpan(__GLGENcontext *gengc)#endif
#else //!DITHER
#if (BPP == 8)
__fastGenTex8DecalSpan(__GLGENcontext *gengc)#elif (BPP == 16)
__fastGenTex16DecalSpan(__GLGENcontext *gengc)#elif (BPP == 24)
__fastGenTex24DecalSpan(__GLGENcontext *gengc)#else
__fastGenTex32DecalSpan(__GLGENcontext *gengc)#endif
#endif //!DITHER
{ register ULONG sAccum; register ULONG tAccum; LONG sDelta; LONG tDelta; ULONG rShift; ULONG gShift; ULONG bShift; ULONG tShift; ULONG sMask, tMask; ULONG wLog2; ULONG hLog2; GENACCEL *pGenAccel; __GLcolorBuffer *cfb; BYTE *pPix; UCHAR *texAddr; USHORT *texBits;#if DITHER
ULONG ditherVal;#endif
#if (BPP == 8)
BYTE *pXlat;#endif
ULONG *pMask;#if DITHER
ULONG ditherShift; ULONG ditherRow;#endif
LONG count; LONG totalCount; __GLtexture *tex = ((__GLcontext *)gengc)->texture.currentTexture;
wLog2 = tex->level[0].widthLog2; hLog2 = tex->level[0].heightLog2; sMask = (~(~0 << wLog2)) << 16; tMask = (~(~0 << hLog2)) << 16; tShift = 13 - wLog2;
// get color deltas and accumulators
pGenAccel = (GENACCEL *)(gengc->pPrivateArea);
sDelta = pGenAccel->spanDelta.s; tDelta = pGenAccel->spanDelta.t;
sAccum = pGenAccel->spanValue.s; tAccum = pGenAccel->spanValue.t;
texAddr = (UCHAR *)pGenAccel->texImage;
cfb = gengc->gc.polygon.shader.cfb;
rShift = cfb->redShift; gShift = cfb->greenShift; bShift = cfb->blueShift;
// get address of destination
if (pGenAccel->flags & SURFACE_TYPE_DIB) { int xScr; int yScr;
xScr = gengc->gc.polygon.shader.frag.x - gengc->gc.constants.viewportXAdjust + cfb->buf.xOrigin; yScr = gengc->gc.polygon.shader.frag.y - gengc->gc.constants.viewportYAdjust + cfb->buf.yOrigin;
pPix = (BYTE *)cfb->buf.base + (yScr * cfb->buf.outerWidth) +#if (BPP == 8)
xScr;#elif (BPP == 16)
(xScr << 1);#elif (BPP == 24)
xScr + (xScr << 1);#else
(xScr << 2);#endif //BPP
} else pPix = gengc->ColorsBits;
// set up pointer to translation table as needed
#if (BPP == 8)
pXlat = gengc->pajTranslateVector;#endif
#if DITHER
ditherRow = Dither_4x4[gengc->gc.polygon.shader.frag.y & 0x3]; ditherShift = (gengc->gc.polygon.shader.frag.x & 0x3) << 3;#endif
pMask = gengc->gc.polygon.shader.stipplePat; if ((totalCount = count = gengc->gc.polygon.shader.length) > 32) count = 32;
for (; totalCount > 0; totalCount -= 32) { ULONG mask; ULONG maskTest; if ((mask = *pMask++) == 0) { sAccum += (sDelta << 5); tAccum += (tDelta << 5);
pPix += (32 * (BPP / 8)); continue; }
maskTest = 0x80000000;
if ((count = totalCount) > 32) count = 32;
for (; count; count--, maskTest >>= 1) { if (mask & maskTest) {#if (DITHER) || (BPP >= 24)
DWORD color;#endif
texBits = (USHORT *)(texAddr + ((sAccum & sMask) >> 13) + ((tAccum & tMask) >> tShift));
#if DITHER
ditherVal = ((ditherRow >> ditherShift) & 0xff);
ditherShift = (ditherShift + 8) & 0x18;
color = (((texBits[0] + ditherVal) >> 8) << rShift) | (((texBits[1] + ditherVal) >> 8) << gShift) | (((texBits[2] + ditherVal) >> 8) << bShift);
#if (BPP == 8)
// XXX the color value should *not* have to be masked!
color = *(pXlat + (color & 0xff)); *pPix = (BYTE)color;#elif (BPP == 16)
*((WORD *)pPix) = (USHORT)color;#elif (BPP == 24)
*pPix = (BYTE)color; *(pPix + 1) = (BYTE)(color >> 8); *(pPix + 2) = (BYTE)(color >> 16);#else
*((DWORD *)pPix) = color;#endif //BPP
#else //!DITHER
#if (BPP == 8)
*pPix = *((BYTE *)&texBits[3]);#elif (BPP == 16)
*((WORD *)pPix) = *((WORD *)&texBits[3]);#elif (BPP == 24)
color = ((texBits[0] >> 8) << rShift) | ((texBits[1] >> 8) << gShift) | ((texBits[2] >> 8) << bShift);
*pPix = (BYTE)color; *(pPix + 1) = (BYTE)(color >> 8); *(pPix + 2) = (BYTE)(color >> 16);#else
color = ((texBits[0] >> 8) << rShift) | ((texBits[1] >> 8) << gShift) | ((texBits[2] >> 8) << bShift);
*((DWORD *)pPix) = color;#endif //BPP
#endif //DITHER
} sAccum += sDelta; tAccum += tDelta;
pPix += (BPP / 8); } }}
#if !DITHER
#undef ditherVal
#endif
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