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fix some StepX/StepY mix-ups in alpha interpolation

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Brian 2007-05-02 08:48:20 -06:00
parent 04c401c91e
commit 99f24c8d17
1 changed files with 6 additions and 6 deletions
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12
src/mesa/swrast/s_tritemp.h
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@ -1,6 +1,6 @@
/*
* Mesa 3-D graphics library
* Version: 6.5.3
* Version: 7.0
*
* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
*
@ -499,7 +499,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0,
# endif /* GL_FLOAT */
# ifdef INTERP_ALPHA
span.attrStepX[FRAG_ATTRIB_COL0][3] = oneOverArea * (eMaj_da * eBot.dy - eMaj.dy * eBot_da);
span.attrStepX[FRAG_ATTRIB_COL0][3] = oneOverArea * (eMaj.dx * eBot_da - eMaj_da * eBot.dx);
span.attrStepY[FRAG_ATTRIB_COL0][3] = oneOverArea * (eMaj.dx * eBot_da - eMaj_da * eBot.dx);
# if CHAN_TYPE == GL_FLOAT
span.alphaStep = span.attrStepX[FRAG_ATTRIB_COL0][3];
# else
@ -523,7 +523,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0,
span.blueStep = 0;
# endif /* GL_FLOAT */
# ifdef INTERP_ALPHA
span.attrStepX[FRAG_ATTRIB_COL0][3] = span.attrStepX[FRAG_ATTRIB_COL0][3] = 0.0F;
span.attrStepX[FRAG_ATTRIB_COL0][3] = span.attrStepY[FRAG_ATTRIB_COL0][3] = 0.0F;
# if CHAN_TYPE == GL_FLOAT
span.alphaStep = 0.0F;
# else
@ -893,11 +893,11 @@ static void NAME(GLcontext *ctx, const SWvertex *v0,
# endif
# ifdef INTERP_ALPHA
# if CHAN_TYPE == GL_FLOAT
aLeft = vLower->color[ACOMP] + (span.attrStepX[FRAG_ATTRIB_COL0][3] * adjx + span.attrStepX[FRAG_ATTRIB_COL0][3] * adjy) * (1.0F / FIXED_SCALE);
fdaOuter = span.attrStepX[FRAG_ATTRIB_COL0][3] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][3];
aLeft = vLower->color[ACOMP] + (span.attrStepX[FRAG_ATTRIB_COL0][3] * adjx + span.attrStepY[FRAG_ATTRIB_COL0][3] * adjy) * (1.0F / FIXED_SCALE);
fdaOuter = span.attrStepY[FRAG_ATTRIB_COL0][3] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][3];
# else
aLeft = (GLint)(ChanToFixed(vLower->color[ACOMP]) + span.attrStepX[FRAG_ATTRIB_COL0][3] * adjx + span.attrStepX[FRAG_ATTRIB_COL0][3] * adjy) + FIXED_HALF;
fdaOuter = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL0][3] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][3]);
fdaOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_COL0][3] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][3]);
# endif
# endif
}