83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
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/******************************Module*Header*******************************\
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* Module Name: spangen.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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ULONG ditherVal;
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if (flags & GEN_DITHER) {
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ditherVal = pdither[iDither];
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} else {
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if ((flags & (GEN_SHADE | GEN_TEXTURE | GEN_RGBMODE)) ==
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(GEN_SHADE | GEN_TEXTURE | GEN_RGBMODE)) {
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ditherVal = 0x08;
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} else {
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ditherVal = 0x0000;
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}
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}
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if (!(flags & GEN_RGBMODE)) {
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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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}
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} else {
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if (flags & GEN_TEXTURE) {
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texBits = (texAddr + ((sAccum & sMask) >> 14) +
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((tAccum & tMask) >> tShift));
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if (flags & GEN_SHADE) {
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r = ((ULONG)(gbMulTable[(((rAccum >> rBits) & 0xff00) | texBits[2])] << rBits) + ditherVal) >> 8;
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g = ((ULONG)(gbMulTable[(((gAccum >> gBits) & 0xff00) | texBits[1])] << gBits) + ditherVal) >> 8;
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b = ((ULONG)(gbMulTable[(((bAccum >> bBits) & 0xff00) | texBits[0])] << bBits) + ditherVal) >> 8;
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} else {
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if (flags & GEN_DITHER) {
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r = ((ULONG)(gbMulTable[(rAccum | texBits[2])] << rBits) + ditherVal) >> 8;
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g = ((ULONG)(gbMulTable[(gAccum | texBits[1])] << gBits) + ditherVal) >> 8;
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b = ((ULONG)(gbMulTable[(bAccum | texBits[0])] << bBits) + ditherVal) >> 8;
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} else {
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r = (texBits[2] << rBits) >> 8;
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g = (texBits[1] << gBits) >> 8;
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b = (texBits[0] << bBits) >> 8;
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}
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}
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} else {
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r = (rAccum + ditherVal) >> 16;
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g = (gAccum + ditherVal) >> 16;
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b = (bAccum + ditherVal) >> 16;
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}
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color = (r << rShift) |
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(g << gShift) |
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(b << bShift);
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}
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if (BPP == 8) {
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*pPix = gengc->xlatPalette[color & 0xff];
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#ifdef OLDWAY
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if ((flags & (GEN_TEXTURE | GEN_SHADE | GEN_DITHER)) ==
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GEN_TEXTURE) {
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*pPix = (BYTE)color;
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} else {
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*pPix = (BYTE)pXlat[color & 0xff];
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}
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#endif
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} else if (BPP == 16) {
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*((WORD *)pPix) = (USHORT)color;
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} else if (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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}
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}
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