381 lines
9.7 KiB
C
381 lines
9.7 KiB
C
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/******************************Module*Header*******************************\
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* Module Name: texspan.h
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*
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* Main header file for textured spans.
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*
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* 22-Nov-1995 ottob Created
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*
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* Copyright (c) 1995 Microsoft Corporation
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\**************************************************************************/
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typedef LONG FIXED16;
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#define RMASK (((1 << RBITS) - 1) << RSHIFT)
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#define GMASK (((1 << GBITS) - 1) << GSHIFT)
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#define BMASK (((1 << BBITS) - 1) << BSHIFT)
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#if (REPLACE || FAST_REPLACE)
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#define RRIGHTSHIFTADJ (16 - (RSHIFT + RBITS))
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#define GRIGHTSHIFTADJ (16 - (GSHIFT + GBITS))
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#define BRIGHTSHIFTADJ (16 - (BSHIFT + BBITS))
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#else
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#define RRIGHTSHIFTADJ (16 - (RSHIFT))
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#define GRIGHTSHIFTADJ (16 - (GSHIFT))
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#define BRIGHTSHIFTADJ (16 - (BSHIFT))
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#endif
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#define S_SHIFT_PAL 16
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#define T_SHIFT_PAL 6
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#define TMASK_SUBDIV GENACCEL(gengc).tMaskSubDiv
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#define TSHIFT_SUBDIV GENACCEL(gengc).tShiftSubDiv
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#if (FAST_REPLACE)
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#define TEX_PALETTE GENACCEL(gengc).texImageReplace
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#if (PALETTE_ONLY)
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#define TEX_IMAGE GENACCEL(gengc).texImage
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#else
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#define TEX_IMAGE GENACCEL(gengc).texImageReplace
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#endif
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#if (PALETTE_ONLY)
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#define S_SHIFT S_SHIFT_PAL
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#define T_SHIFT 6
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#elif (BPP == 8)
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#define S_SHIFT 16
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#define T_SHIFT 6
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#else
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#define S_SHIFT 15
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#define T_SHIFT 5
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#endif
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#else
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#if (PALETTE_ONLY)
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#define S_SHIFT S_SHIFT_PAL
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#define T_SHIFT 6
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#else
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#define S_SHIFT 14
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#define T_SHIFT 4
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#endif
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#define TEX_IMAGE GENACCEL(gengc).texImage
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#define TEX_PALETTE GENACCEL(gengc).texPalette
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#endif
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#define ALPHA_MODULATE \
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aDisplay = (ULONG)(gbMulTable[((aAccum >> 8) & 0xff00) | texBits[3]]) << 8;
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#define ALPHA_NOMODULATE \
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aDisplay = ((ULONG)texBits[3] << 8);
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#define ALPHA_READ_8 \
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{\
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ULONG pix = (ULONG)gengc->pajInvTranslateVector[*pPix];\
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ULONG alphaVal = (0xff00 - aDisplay);\
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\
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rDisplay = gbMulTable[((pix & RMASK) << (GBITS + BBITS)) | alphaVal];\
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gDisplay = gbMulTable[((pix & GMASK) << (BBITS)) | alphaVal];\
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bDisplay = gbMulTable[(pix & BMASK) | alphaVal];\
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}
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#define ALPHA_READ_16 \
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{\
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ULONG pix = *((USHORT *)pPix);\
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ULONG alphaVal = (0xff00 - aDisplay);\
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\
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rDisplay = gbMulTable[((pix & RMASK) >> (RSHIFT - (8 - RBITS))) | alphaVal];\
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gDisplay = gbMulTable[((pix & GMASK) >> (GSHIFT - (8 - GBITS))) | alphaVal];\
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bDisplay = gbMulTable[((pix & BMASK) << (8 - BBITS)) | alphaVal];\
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}
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#define ALPHA_READ_32 \
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{\
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ULONG alphaVal = (0xff00 - aDisplay);\
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\
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rDisplay = gbMulTable[pPix[2] | alphaVal];\
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gDisplay = gbMulTable[pPix[1] | alphaVal];\
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bDisplay = gbMulTable[pPix[0] | alphaVal];\
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}
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#if (BPP == 8)
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#define ALPHA_READ ALPHA_READ_8
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#elif (BPP == 16)
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#define ALPHA_READ ALPHA_READ_16
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#else
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#define ALPHA_READ ALPHA_READ_32
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#endif
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#undef STRING1
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#undef STRING2
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#undef STRING3
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#undef STRING4
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#if FAST_REPLACE
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#if PALETTE_ONLY
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#define STRING1 __fastFastPerspPalReplace
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#else
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#define STRING1 __fastFastPerspReplace
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#endif
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#elif REPLACE
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#if (PALETTE_ONLY)
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#define STRING1 __fastPerspPalReplace
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#else
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#define STRING1 __fastPerspReplace
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#endif
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#elif FLAT_SHADING
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#define STRING1 __fastPerspFlat
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#else
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#define STRING1 __fastPerspSmooth
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#endif
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#if ALPHA
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#define STRING2 Alpha
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#endif
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#if ZBUFFER
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#if (ZCMP_L)
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#define STRING3 Zlt
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#else
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#define STRING3 Zle
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#endif
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#endif
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#if (BPP == 8)
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#define STRING4 332
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#elif (BPP == 16)
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#if (GBITS == 5)
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#define STRING4 555
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#else
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#define STRING4 565
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#endif
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#else
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#define STRING4 888
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#endif
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#ifdef STRING2
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#ifdef STRING3
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void FASTCALL STRCAT4(STRING1, STRING2, STRING3, STRING4)
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#else
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void FASTCALL STRCAT3(STRING1, STRING2, STRING4)
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#endif
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#else
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#ifdef STRING3
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void FASTCALL STRCAT3(STRING1, STRING3, STRING4)
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#else
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void FASTCALL STRCAT2(STRING1, STRING4)
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#endif
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#endif
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(__GLGENcontext *gengc)
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{
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__GLfloat qwInv;
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ULONG count;
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LONG subDivCount;
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FIXED16 sAccum;
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FIXED16 tAccum;
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__GLfloat qwAccum;
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FIXED16 subDs, subDt;
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FIXED16 sResult, tResult;
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FIXED16 sResultNew, tResultNew;
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BYTE *pPix;
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BYTE *texAddr;
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BYTE *texBits;
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#if ALPHA
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ULONG rDisplay, gDisplay, bDisplay, aDisplay;
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#endif
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#if (FLAT_SHADING || SMOOTH_SHADING)
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PDWORD pdither;
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FIXED16 rAccum, gAccum, bAccum;
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#if (ALPHA)
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FIXED16 aAccum;
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#endif
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#endif
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#if (BPP == 32)
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ULONG pixAdj;
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#if (FLAT_SHADING || SMOOTH_SHADING)
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ULONG ditherVal;
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#endif
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#endif
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#if PALETTE_ENABLED
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BOOL bPalette = (GENACCEL(gengc).texPalette != NULL);
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#endif
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BOOL bOrtho = (GENACCEL(gengc).flags & GEN_TEXTURE_ORTHO);
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if (!bOrtho) {
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if (CASTINT(gengc->gc.polygon.shader.frag.qw) <= 0)
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gengc->gc.polygon.shader.frag.qw = (__GLfloat)1.0;
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__GL_FLOAT_BEGIN_DIVIDE(__glOne, gengc->gc.polygon.shader.frag.qw,
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&qwInv);
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}
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subDivCount = 7;
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sAccum = GENACCEL(gengc).spanValue.s;
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tAccum = GENACCEL(gengc).spanValue.t;
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qwAccum = gengc->gc.polygon.shader.frag.qw;
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#if (FLAT_SHADING)
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rAccum = ((GENACCEL(gengc).spanValue.r >> RBITS) & 0xff00);
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gAccum = ((GENACCEL(gengc).spanValue.g >> GBITS) & 0xff00);
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bAccum = ((GENACCEL(gengc).spanValue.b >> BBITS) & 0xff00);
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#if (ALPHA)
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aAccum = GENACCEL(gengc).spanValue.a;
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#endif
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#elif (SMOOTH_SHADING)
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rAccum = GENACCEL(gengc).spanValue.r;
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gAccum = GENACCEL(gengc).spanValue.g;
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bAccum = GENACCEL(gengc).spanValue.b;
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#if ALPHA
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aAccum = GENACCEL(gengc).spanValue.a;
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#endif
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#endif
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#if ((BPP == 32) && (FLAT_SHADING || SMOOTH_SHADING))
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ditherVal = ditherShade[0];
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#endif
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if (!bOrtho) {
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__GL_FLOAT_SIMPLE_END_DIVIDE(qwInv);
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sResult = FTOL((__GLfloat)sAccum * qwInv);
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tResult = ((FTOL((__GLfloat)tAccum * qwInv)) >> TSHIFT_SUBDIV) & ~7;
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qwAccum += GENACCEL(gengc).qwStepX;
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if (CASTINT(qwAccum) <= 0)
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qwAccum = (__GLfloat)1.0;
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__GL_FLOAT_SIMPLE_BEGIN_DIVIDE(__glOne, qwAccum, qwInv);
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} else {
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sResult = sAccum;
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tResult = (tAccum >> TSHIFT_SUBDIV) & ~7;
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}
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sAccum += GENACCEL(gengc).sStepX;
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tAccum += GENACCEL(gengc).tStepX;
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if (GENACCEL(gengc).flags & SURFACE_TYPE_DIB) {
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#if (BPP != 32)
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pPix = GENACCEL(gengc).pPix +
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gengc->gc.polygon.shader.frag.x * (BPP / 8);
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#else
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if (GENACCEL(gengc).bpp == 32) {
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pPix = GENACCEL(gengc).pPix +
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gengc->gc.polygon.shader.frag.x * 4;
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pixAdj = 4;
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} else {
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pPix = GENACCEL(gengc).pPix +
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gengc->gc.polygon.shader.frag.x * 3;
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pixAdj = 3;
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}
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#endif
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} else {
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pPix = gengc->ColorsBits;
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#if (BPP == 32)
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pixAdj = GENACCEL(gengc).xMultiplier;
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#endif
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}
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#if (FLAT_SHADING || SMOOTH_SHADING)
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#if (BPP != 32)
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pdither = (gengc->gc.polygon.shader.frag.y & 0x3) * 8 + ditherShade +
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(((gengc->gc.polygon.shader.frag.x & 0x3) -
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(((ULONG_PTR)pPix / (BPP / 8)) & 0x3)) & 0x3);
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#endif
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#endif
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if (!bOrtho) {
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__GL_FLOAT_SIMPLE_END_DIVIDE(qwInv);
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sResultNew = FTOL((__GLfloat)sAccum * qwInv);
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tResultNew = ((FTOL((__GLfloat)tAccum * qwInv)) >> TSHIFT_SUBDIV) & ~7;
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qwAccum += GENACCEL(gengc).qwStepX;
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if (CASTINT(qwAccum) <= 0)
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qwAccum = (__GLfloat)1.0;
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__GL_FLOAT_SIMPLE_BEGIN_DIVIDE(__glOne, qwAccum, qwInv);
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} else {
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sResultNew = sAccum;
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tResultNew = (tAccum >> TSHIFT_SUBDIV) & ~7;
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}
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sAccum += GENACCEL(gengc).sStepX;
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tAccum += GENACCEL(gengc).tStepX;
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subDs = (sResultNew - sResult) >> 3;
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subDt = (tResultNew - tResult) >> 3;
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#if ZBUFFER
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{
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GLuint zAccum = gengc->gc.polygon.shader.frag.z;
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GLint zDelta = gengc->gc.polygon.shader.dzdx;
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PBYTE zbuf = (PBYTE)gengc->gc.polygon.shader.zbuf;
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if (GENACCEL(gengc).flags & GEN_LESS) {
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for (count = gengc->gc.polygon.shader.length;;) {
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if ( ((__GLz16Value)(zAccum >> Z16_SHIFT)) < *((__GLz16Value*)zbuf) ) {
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*((__GLz16Value*)zbuf) = ((__GLz16Value)(zAccum >> Z16_SHIFT));
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#include "texspan2.h"
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}
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if (--count == 0)
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goto exit;
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zbuf += 2;
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zAccum += zDelta;
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#include "texspan3.h"
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}
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} else {
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for (count = gengc->gc.polygon.shader.length;;) {
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if ( ((__GLz16Value)(zAccum >> Z16_SHIFT)) <= *((__GLz16Value*)zbuf) ) {
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*((__GLz16Value*)zbuf) = ((__GLz16Value)(zAccum >> Z16_SHIFT));
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#include "texspan2.h"
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}
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if (--count == 0)
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goto exit;
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zbuf += 2;
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zAccum += zDelta;
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#include "texspan3.h"
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}
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}
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}
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#else
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for (count = gengc->gc.polygon.shader.length;;) {
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#include "texspan2.h"
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if (--count == 0)
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goto exit;
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#include "texspan3.h"
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}
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#endif
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exit:
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if (!bOrtho) {
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__GL_FLOAT_SIMPLE_END_DIVIDE(qwInv);
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}
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}
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#undef RMASK
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#undef GMASK
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#undef BMASK
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#undef RRIGHTSHIFTADJ
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#undef GRIGHTSHIFTADJ
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|
|
#undef BRIGHTSHIFTADJ
|
||
|
|
#undef ALPHA_MODULATE
|
||
|
|
#undef ALPHA_NOMODULATE
|
||
|
|
#undef ALPHA_READ_8
|
||
|
|
#undef ALPHA_READ_16
|
||
|
|
#undef ALPHA_READ_32
|
||
|
|
#undef ALPHA_READ
|
||
|
|
|
||
|
|
#undef S_SHIFT
|
||
|
|
#undef T_SHIFT
|
||
|
|
#undef TMASK_SUBDIV
|
||
|
|
#undef TSHIFT_SUBDIV
|
||
|
|
#undef TEX_IMAGE
|
||
|
|
#undef TEX_PALETTE
|
||
|
|
#undef S_SHIFT_PAL
|
||
|
|
#undef T_SHIFT_PAL
|
||
|
|
|