Mesa (staging/18.3): radv: write the alpha channel of MRT0 when alpha coverage is enabled

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Module: Mesa
Branch: staging/18.3
Commit: 2045d5e689122e90106c76486968496910cbb537
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2045d5e689122e90106c76486968496910cbb537

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Fri Feb 15 18:02:52 2019 +0100

radv: write the alpha channel of MRT0 when alpha coverage is enabled

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109597
Cc: 18.3 19.0 <mesa-stable at lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
(cherry picked from commit 0d8f09629377da9cf48ab4315574d69fdef5369d)

---

 src/amd/vulkan/radv_pipeline.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/amd/vulkan/radv_pipeline.c b/src/amd/vulkan/radv_pipeline.c
index 86d78e87b65..c9f617e7594 100644
--- a/src/amd/vulkan/radv_pipeline.c
+++ b/src/amd/vulkan/radv_pipeline.c
@@ -511,6 +511,13 @@ radv_pipeline_compute_spi_color_formats(struct radv_pipeline *pipeline,
 
 		if (subpass->color_attachments[i].attachment == VK_ATTACHMENT_UNUSED) {
 			cf = V_028714_SPI_SHADER_ZERO;
+
+			if (blend->need_src_alpha & (1 << i)) {
+				/* Write the alpha channel of MRT0 when alpha coverage is
+				 * enabled because the depth attachment needs it.
+				 */
+				col_format |= V_028714_SPI_SHADER_32_ABGR;
+			}
 		} else {
 			struct radv_render_pass_attachment *attachment = pass->attachments + subpass->color_attachments[i].attachment;
 			bool blend_enable =