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radv/ac/nir: only emit tess factors to storage if tes reads them

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Otherwise we just need to write them to the tf ring.

this seems to improve the tessellation demo on Bonarie
~2190->~2230 fps

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2017-10-23 06:23:29 +10:00
parent 6ce550453f
commit da9c3cd3ee
3 changed files with 4 additions and 2 deletions
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1
src/amd/vulkan/radv_pipeline.c
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@@ -1773,6 +1773,7 @@ void radv_create_shaders(struct radv_pipeline *pipeline,
if (keys)
keys[MESA_SHADER_TESS_CTRL].tcs.primitive_mode = nir[MESA_SHADER_TESS_EVAL]->info.tess.primitive_mode;
keys[MESA_SHADER_TESS_CTRL].tcs.tes_reads_tess_factors = !!(nir[MESA_SHADER_TESS_EVAL]->info.inputs_read & (VARYING_BIT_TESS_LEVEL_INNER | VARYING_BIT_TESS_LEVEL_OUTER));
nir_lower_tes_patch_vertices(nir[MESA_SHADER_TESS_EVAL], nir[MESA_SHADER_TESS_CTRL]->info.tess.tcs_vertices_out);
}