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radv: fix alpha-to-coverage when there is unused color attachments

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When alphaToCoverage is enabled, we should always write the alpha
channel of MRT0 if it's unused. This now matches RadeonSI.

This fixes the new CTS:
dEQP-VK.pipeline.multisample.alpha_to_coverage_unused_attachment.samples_*.alpha_invisible

Cc: 19.0 19.1 <mesa-stable@lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-By: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl
(cherry picked from commit 91aa25f462)
This commit is contained in:
Samuel Pitoiset 2019-06-06 16:31:01 +02:00 • committed by Dylan Baker
parent 7768f52c04
commit a4f5616c60
1 changed files with 1 additions and 1 deletions
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2
src/amd/vulkan/radv_pipeline.c
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@ -524,7 +524,7 @@ radv_pipeline_compute_spi_color_formats(struct radv_pipeline *pipeline,
col_format |= cf << (4 * i);
}
if (!col_format && blend->need_src_alpha & (1 << 0)) {
if (!(col_format & 0xf) && blend->need_src_alpha & (1 << 0)) {
/* When a subpass doesn't have any color attachments, write the
* alpha channel of MRT0 when alpha coverage is enabled because
* the depth attachment needs it.