135 lines
5.2 KiB
C
135 lines
5.2 KiB
C
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/******************************Module*Header*******************************\
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* Module Name: span2.h
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*
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* This code figures out the color for pixel and stores it
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*
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* 14-Oct-1994 mikeke Created
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*
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* Copyright (c) 1994 Microsoft Corporation
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\**************************************************************************/
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{
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DWORD r, g, b;
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DWORD color;
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#if DITHER
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#if (BPP == 8)
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ULONG ditherVal = pdither[((ULONG_PTR)pPix) & 0x3];
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#elif (BPP == 16)
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ULONG ditherVal = pdither[((ULONG_PTR)pPix & 0x6) >> 1];
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#elif (BPP == 24)
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ULONG ditherVal = pdither[iDither];
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#else
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ULONG ditherVal = pdither[((ULONG_PTR)pPix & 0xc) >> 2];
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#endif
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#else
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#if (RGBMODE) && (TEXTURE) && (SHADE)
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#define ditherVal 0x0008
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#else
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#define ditherVal 0x0000
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#endif
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#endif
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#if TEXTURE
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#if !(SHADE) && !(DITHER) && (BPP == 8)
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texBits = (BYTE *)(texAddr + ((sAccum & GENACCEL(gengc).sMask) >> 16) +
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((tAccum & GENACCEL(gengc).tMask) >> GENACCEL(gengc).tShift));
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#elif !(SHADE) && !(DITHER) && (BPP == 16)
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texBits = (BYTE *)(texAddr + ((sAccum & GENACCEL(gengc).sMask) >> 15) +
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((tAccum & GENACCEL(gengc).tMask) >> GENACCEL(gengc).tShift));
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#else
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texBits = (BYTE *)(texAddr + ((sAccum & GENACCEL(gengc).sMask) >> 14) +
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((tAccum & GENACCEL(gengc).tMask) >> GENACCEL(gengc).tShift));
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#endif
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#endif
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#if !(RGBMODE)
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// !!! probably don't need to mask values
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#if (BPP == 8)
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color = ((rAccum + ditherVal) >> 16) & 0xff;
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#else
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color = ((PULONG)pXlat)[(((rAccum + ditherVal) >> 16) & 0xfff)];
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#endif
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#else //RGBMODE
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#if TEXTURE
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#if SHADE
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#define BIGSHIFT 8
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#ifdef RSHIFT
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r = ((ULONG)gbMulTable[(((rAccum >> RBITS) & 0xff00) | texBits[2])] << RBITS) + ditherVal;
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g = ((ULONG)gbMulTable[(((gAccum >> GBITS) & 0xff00) | texBits[1])] << GBITS) + ditherVal;
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b = ((ULONG)gbMulTable[(((bAccum >> BBITS) & 0xff00) | texBits[0])] << BBITS) + ditherVal;
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#else
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r = ((ULONG)gbMulTable[(((rAccum >> rBits) & 0xff00) | texBits[2])] << rBits) + ditherVal;
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g = ((ULONG)gbMulTable[(((gAccum >> gBits) & 0xff00) | texBits[1])] << gBits) + ditherVal;
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b = ((ULONG)gbMulTable[(((bAccum >> bBits) & 0xff00) | texBits[0])] << bBits) + ditherVal;
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#endif
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#else //!SHADE
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#define BIGSHIFT 8
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#if DITHER
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#ifdef RSHIFT
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r = ((ULONG)gbMulTable[(rAccum | texBits[2])] << RBITS) + ditherVal;
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g = ((ULONG)gbMulTable[(gAccum | texBits[1])] << GBITS) + ditherVal;
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b = ((ULONG)gbMulTable[(bAccum | texBits[0])] << BBITS) + ditherVal;
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#else
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r = ((ULONG)gbMulTable[(rAccum | texBits[2])] << rBits) + ditherVal;
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g = ((ULONG)gbMulTable[(gAccum | texBits[1])] << gBits) + ditherVal;
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b = ((ULONG)gbMulTable[(bAccum | texBits[0])] << bBits) + ditherVal;
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#endif
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#else //!DITHER
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#if (!((BPP == 8) || (BPP == 16)))
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#ifdef RSHIFT
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r = (texBits[2] << RBITS);
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g = (texBits[1] << GBITS);
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b = (texBits[0] << BBITS);
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#else
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r = (texBits[2] << rBits);
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g = (texBits[1] << gBits);
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b = (texBits[0] << bBits);
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#endif
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#endif
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#endif //DITHER
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#endif //SHADE
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#else //!TEXTURE
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#define BIGSHIFT 16
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r = rAccum + ditherVal;
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g = gAccum + ditherVal;
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b = bAccum + ditherVal;
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#endif //TEXTURE
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#if !((TEXTURE) && !(SHADE) && !(DITHER) && ((BPP == 8) || (BPP == 16)))
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#ifdef RSHIFT
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color = ((r >> BIGSHIFT) << RSHIFT) |
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((g >> BIGSHIFT) << GSHIFT) |
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((b >> BIGSHIFT) << BSHIFT);
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#else
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color = ((r >> BIGSHIFT) << rShift) |
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((g >> BIGSHIFT) << gShift) |
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((b >> BIGSHIFT) << bShift);
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#endif
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#endif
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#undef BIGSHIFT
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#endif //RGBMODE
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#if (TEXTURE) && !(SHADE) && !(DITHER) && ((BPP == 8) || (BPP == 16))
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#if (BPP == 8)
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*pPix = texBits[0];
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#else
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*((WORD *)pPix) = *((WORD *)texBits);
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#endif
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#else
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#if (BPP == 8)
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*pPix = gengc->xlatPalette[color & 0xff];
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#elif (BPP == 16)
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*((WORD *)pPix) = (USHORT)color;
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#elif (BPP == 24)
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*pPix = (BYTE)color;
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*(pPix + 1) = (BYTE)(color >> 8);
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*(pPix + 2) = (BYTE)(color >> 16);
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#else
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*((DWORD *)pPix) = color;
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#endif // BPP
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#endif
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}
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