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llvmpipe: Fix bug with blend factor in complementary optimisations.

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Fixes fdo 52168.

Reviewed-by: José Fonseca <jfonseca@vmware.com>
This commit is contained in:
James Benton 2012-07-17 12:08:02 +01:00 • committed by José Fonseca
parent 89e755d762
commit e253175c9c
1 changed files with 4 additions and 2 deletions
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6
src/gallium/drivers/llvmpipe/lp_bld_blend.c
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@ -152,20 +152,22 @@ lp_build_blend(struct lp_build_context *bld,
}
} else if(bld->type.floating && func == PIPE_BLEND_SUBTRACT) {
result = lp_build_add(bld, src, dst);
result = lp_build_mul(bld, result, src_factor);
if (factor_src < factor_dst) {
result = lp_build_mul(bld, result, src_factor);
return lp_build_sub(bld, result, dst);
} else {
result = lp_build_mul(bld, result, dst_factor);
return lp_build_sub(bld, src, result);
}
} else if(bld->type.floating && func == PIPE_BLEND_REVERSE_SUBTRACT) {
result = lp_build_add(bld, src, dst);
result = lp_build_mul(bld, result, src_factor);
if (factor_src < factor_dst) {
result = lp_build_mul(bld, result, src_factor);
return lp_build_sub(bld, dst, result);
} else {
result = lp_build_mul(bld, result, dst_factor);
return lp_build_sub(bld, result, src);
}
}