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

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
This commit is contained in:
Samuel Pitoiset 2019-06-06 16:31:01 +02:00
parent 2fe7f9f2ae
commit 91aa25f462
1 changed files with 1 additions and 1 deletions
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2
src/amd/vulkan/radv_pipeline.c
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@ -523,7 +523,7 @@ 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.