[Mesa-dev] [PATCH 02/18] anv: Restrict the nuber of color regions to those actually written

[Jason Ekstrand]

The back-end compiler emits the number of color writes specified by
wm_prog_key::nr_color_regions regardless of what nir_store_outputs we
have.  Once we've gone through and figured out which render targets
actually exist and are written by the shader, we should restrict the key
to avoid extra RT write messages.
---
 src/intel/vulkan/anv_pipeline.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/intel/vulkan/anv_pipeline.c b/src/intel/vulkan/anv_pipeline.c
index 7f89c02407b..f0c8f22c9f0 100644
--- a/src/intel/vulkan/anv_pipeline.c
+++ b/src/intel/vulkan/anv_pipeline.c
@@ -962,6 +962,11 @@ anv_pipeline_compile_fs(struct anv_pipeline *pipeline,
          num_rts = 1;
       }
 
+      /* Now that we've determined the actual number of render targets, adjust
+       * the key accordingly.
+       */
+      key.nr_color_regions = num_rts;
+
       assert(num_rts <= max_rt);
       map.surface_to_descriptor -= num_rts;
       map.surface_count += num_rts;
-- 
2.17.1