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r300: Don't disable destination read if the src blend factor needs it

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The read can remain disabled if the src alpha factor needs it because
the result would still be zero.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57984

NOTE: This is a candidate for stable release branches.

Signed-off-by: Marek Olšák <maraeo@gmail.com>
This commit is contained in:
Stefan Dösinger 2012-12-07 17:38:35 +01:00 • committed by Marek Olšák
parent ff574d653b
commit ff5a9868c8
1 changed files with 10 additions and 2 deletions
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12
src/gallium/drivers/r300/r300_state.c
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@ -288,7 +288,11 @@ static void* r300_create_blend_state(struct pipe_context* pipe,
dstRGB == PIPE_BLENDFACTOR_ZERO) &&
(dstA == PIPE_BLENDFACTOR_SRC_COLOR ||
dstA == PIPE_BLENDFACTOR_SRC_ALPHA ||
dstA == PIPE_BLENDFACTOR_ZERO)) {
dstA == PIPE_BLENDFACTOR_ZERO) &&
(srcRGB != PIPE_BLENDFACTOR_DST_COLOR &&
srcRGB != PIPE_BLENDFACTOR_DST_ALPHA &&
srcRGB != PIPE_BLENDFACTOR_INV_DST_COLOR &&
srcRGB != PIPE_BLENDFACTOR_INV_DST_ALPHA)) {
blend_control |= R500_SRC_ALPHA_0_NO_READ;
}
@ -297,7 +301,11 @@ static void* r300_create_blend_state(struct pipe_context* pipe,
dstRGB == PIPE_BLENDFACTOR_ZERO) &&
(dstA == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
dstA == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
dstA == PIPE_BLENDFACTOR_ZERO)) {
dstA == PIPE_BLENDFACTOR_ZERO) &&
(srcRGB != PIPE_BLENDFACTOR_DST_COLOR &&
srcRGB != PIPE_BLENDFACTOR_DST_ALPHA &&
srcRGB != PIPE_BLENDFACTOR_INV_DST_COLOR &&
srcRGB != PIPE_BLENDFACTOR_INV_DST_ALPHA)) {
blend_control |= R500_SRC_ALPHA_1_NO_READ;
}
}