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-rw-r--r--src/mesa/swrast/s_span.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index b0c04ad021..c6efea3075 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -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;