Mesa (master): radv: don't export NULL layer.

[Dave Airlie]

Module: Mesa
Branch: master
Commit: 32791a05024d54736eab21379e849480fea78559
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=32791a05024d54736eab21379e849480fea78559

Author: Dave Airlie <airlied at redhat.com>
Date:   Mon Mar 19 20:02:58 2018 +0000

radv: don't export NULL layer.

We have some cases where in subpass we want the layer but having
it be 0 and loaded in the frag shader without the vertex shader
exporting it is fine.

So don't export the layer if we don't have a value to put in it.

Fixes: d4c74aed7a8 (radv/multiview: mark layer_input if we have input attachments.)
Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>

---

 src/amd/vulkan/radv_nir_to_llvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/amd/vulkan/radv_nir_to_llvm.c b/src/amd/vulkan/radv_nir_to_llvm.c
index 7379f348d8..ad046adfdb 100644
--- a/src/amd/vulkan/radv_nir_to_llvm.c
+++ b/src/amd/vulkan/radv_nir_to_llvm.c
@@ -2363,7 +2363,7 @@ handle_vs_outputs_post(struct radv_shader_context *ctx,
 		outinfo->export_prim_id = true;
 	}
 
-	if (export_layer_id) {
+	if (export_layer_id && layer_value) {
 		LLVMValueRef values[4];
 
 		values[0] = layer_value;