When the stage preceding FS doesn't export it the fragment shader
might read it, even if it's 0.
Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
src/amd/vulkan/radv_shader_info.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/src/amd/vulkan/radv_shader_info.c
b/src/amd/vulkan/radv_shader_info.c
index 2756d99e769..946f7aa5f23 100644
--- a/src/amd/vulkan/radv_shader_info.c
+++ b/src/amd/vulkan/radv_shader_info.c
@@ -576,4 +576,21 @@ radv_nir_shader_info_pass(const struct nir_shader *nir,
nir->info.stage == MESA_SHADER_TESS_EVAL ||
nir->info.stage == MESA_SHADER_GEOMETRY)
gather_xfb_info(nir, info);
+
+ /* Make sure to export the LayerID if the fragment shader needs it. */
+ if (options->key.vs_common_out.export_layer_id) {
+ switch (nir->info.stage) {
+ case MESA_SHADER_VERTEX:
+ info->vs.output_usage_mask[VARYING_SLOT_LAYER] |= 0x1;
+ break;
+ case MESA_SHADER_TESS_EVAL:
+ info->tes.output_usage_mask[VARYING_SLOT_LAYER] |= 0x1;
+ break;
+ case MESA_SHADER_GEOMETRY:
+ info->gs.output_usage_mask[VARYING_SLOT_LAYER] |= 0x1;
+ break;
+ default:
+ break;
+ }
+ }
}
--
2.22.0
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