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check _PreferPixelFog in _swrast_span_default_fog(), see bug 10669

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This commit is contained in:
Brian 2007-04-18 12:09:40 -06:00
parent 30a79f76fc
commit 884af40864
1 changed files with 14 additions and 5 deletions
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19
src/mesa/swrast/s_span.c
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@ -1,8 +1,8 @@
/*
* Mesa 3-D graphics library
* Version: 6.5
* Version: 6.5.3
*
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@ -69,14 +69,23 @@ _swrast_span_default_z( GLcontext *ctx, SWspan *span )
/**
* Init span's fog interpolation values to the RasterPos fog.
* Init span's fogcoord interpolation values to the RasterPos fog.
* Used during setup for glDraw/CopyPixels.
*/
void
_swrast_span_default_fog( GLcontext *ctx, SWspan *span )
{
span->attrStart[FRAG_ATTRIB_FOGC][0]
= _swrast_z_to_fogfactor(ctx, ctx->Current.RasterDistance);
const SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLfloat fogVal; /* a coord or a blend factor */
if (swrast->_PreferPixelFog) {
/* fog blend factors will be computed from fog coordinates per pixel */
fogVal = ctx->Current.RasterDistance;
}
else {
/* fog blend factor should be computed from fogcoord now */
fogVal = _swrast_z_to_fogfactor(ctx, ctx->Current.RasterDistance);
}
span->attrStart[FRAG_ATTRIB_FOGC][0] = fogVal;
span->attrStepX[FRAG_ATTRIB_FOGC][0] = 0.0;
span->attrStepY[FRAG_ATTRIB_FOGC][0] = 0.0;
span->interpMask |= SPAN_FOG;