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r300g: fix blending when SRC_ALPHA_SATURATE is used

This commit is contained in:
Marek Olšák 2009-12-20 04:28:30 +01:00 committed by Corbin Simpson
parent a6d91a141f
commit 717c28055a
1 changed files with 7 additions and 2 deletions
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9
src/gallium/drivers/r300/r300_state.c
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@ -66,7 +66,11 @@ static void* r300_create_blend_state(struct pipe_context* pipe,
( r300_translate_blend_factor(srcRGB) << R300_SRC_BLEND_SHIFT) |
( r300_translate_blend_factor(dstRGB) << R300_DST_BLEND_SHIFT);
/* optimization: some operations do not require the destination color */
/* Optimization: some operations do not require the destination color.
*
* When SRC_ALPHA_SATURATE is used, colorbuffer reads must be enabled,
* otherwise blending gives incorrect results. It seems to be
* a hardware bug. */
if (eqRGB == PIPE_BLEND_MIN || eqA == PIPE_BLEND_MIN ||
eqRGB == PIPE_BLEND_MAX || eqA == PIPE_BLEND_MAX ||
dstRGB != PIPE_BLENDFACTOR_ZERO ||
@ -78,7 +82,8 @@ static void* r300_create_blend_state(struct pipe_context* pipe,
srcA == PIPE_BLENDFACTOR_DST_COLOR ||
srcA == PIPE_BLENDFACTOR_DST_ALPHA ||
srcA == PIPE_BLENDFACTOR_INV_DST_COLOR ||
srcA == PIPE_BLENDFACTOR_INV_DST_ALPHA)
srcA == PIPE_BLENDFACTOR_INV_DST_ALPHA ||
srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE)
blend->blend_control |= R300_READ_ENABLE;
/* XXX implement the optimization with DISCARD_SRC_PIXELS*/