[Mesa-dev] [PATCH] radv: use dithered alpha-to-coverage

[Rhys Perry]

This matches the behaviour of AMDVLK and hides banding

TODO: run tests
---
 src/amd/vulkan/radv_pipeline.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/amd/vulkan/radv_pipeline.c b/src/amd/vulkan/radv_pipeline.c
index 3561d17aaba..26ee59f11dd 100644
--- a/src/amd/vulkan/radv_pipeline.c
+++ b/src/amd/vulkan/radv_pipeline.c
@@ -681,10 +681,11 @@ radv_pipeline_init_blend_state(struct radv_pipeline *pipeline,
 	else
 		blend.cb_color_control |= S_028808_ROP3(V_028808_ROP3_COPY);
 
-	blend.db_alpha_to_mask = S_028B70_ALPHA_TO_MASK_OFFSET0(2) |
-		S_028B70_ALPHA_TO_MASK_OFFSET1(2) |
-		S_028B70_ALPHA_TO_MASK_OFFSET2(2) |
-		S_028B70_ALPHA_TO_MASK_OFFSET3(2);
+	blend.db_alpha_to_mask = S_028B70_ALPHA_TO_MASK_OFFSET0(3) |
+		S_028B70_ALPHA_TO_MASK_OFFSET1(1) |
+		S_028B70_ALPHA_TO_MASK_OFFSET2(0) |
+		S_028B70_ALPHA_TO_MASK_OFFSET3(2) |
+		S_028B70_OFFSET_ROUND(1);
 
 	if (vkms && vkms->alphaToCoverageEnable) {
 		blend.db_alpha_to_mask |= S_028B70_ALPHA_TO_MASK_ENABLE(1);
-- 
2.20.1