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llvmpipe: Tighten check for alpha-only formats

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The AoS version of ld_build_blend_factor was assuming that if the first
channel was alpha, there were no rgb components.

Fixes glean/blendFunc on System z.  No piglit regressions on x86_64.
The shortcut is still used in tests like spec/ARB_framebuffer_object/
fbo-alpha.

Signed-off-by: Richard Sandiford <rsandifo@linux.vnet.ibm.com>
This commit is contained in:
Richard Sandiford
2014-03-19 17:12:38 +00:00
committed by Roland Scheidegger
parent 8044fd6769
commit f4b3430a36
1 changed files with 1 additions and 1 deletions
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src/gallium/drivers/llvmpipe/lp_bld_blend_aos.c
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@@ -255,7 +255,7 @@ lp_build_blend_factor(struct lp_build_blend_aos_context *bld,
LLVMValueRef rgb_factor_, alpha_factor_;
enum lp_build_blend_swizzle rgb_swizzle;
if (alpha_swizzle == 0) {
if (alpha_swizzle == UTIL_FORMAT_SWIZZLE_X && num_channels == 1) {
return lp_build_blend_factor_unswizzled(bld, alpha_factor, TRUE);
}