Work around glslang issue 988

The basic bug there is that if you have a member of `struct` type in a `uniform` block and then pass a reference to that member directly to a call:

```
struct Foo { vec4 bar; };
uniform U { Foo foo; };

void main() { doSomething(foo); }
```

then glslang generates invalid SPIR-V which seems to cause an issue for some drivers.

This change works around the problem by detecting cases where an argument to a function call is a reference to `uniform` block member (of `struct` type) and then rewrites the code to move that value to a temporary before the call.

1 files changed, 2 insertions, 1 deletions

diff --git a/tests/rewriter/resources-in-structs.glsl b/tests/rewriter/resources-in-structs.glsl
index 6273e8720..206e4a8d8 100644
--- a/tests/rewriter/resources-in-structs.glsl
+++ b/tests/rewriter/resources-in-structs.glsl
@@ -55,8 +55,9 @@ out vec4 color;
 
 void main()
 {
+	Material SLANG_tmp_0 = m;
 	color = evaluateMaterial(
-		m,
+		SLANG_tmp_0,
 		SLANG_parameterBlock_U_m_t,
 		SLANG_parameterBlock_U_m_s, uv);
 }