Add struct codegen tests

example/passthrough_fragment.glsl

@@ -1,15 +1,6 @@
 layout(location = 0) out vec4 outColor;
 
-// Demonstrate struct handling
-struct Color {
-  float r;
-  float g;
-  float b;
-  float a;
-}
-
 void main() {
-  Color color = Color(1.0, 0.0, 0.0, 1.0);
-  outColor = vec4(color.r, color.g, color.b, color.a);
+  outColor = vec4(1.0, 0.0, 0.0, 1.0);
   return;
 }

lib/CodeGen/MLIRCodeGen.cpp

@@ -303,7 +303,6 @@ void MLIRCodeGen::createVariable(shaderpulse::Type *type,
   typeContext = varType;
 
   if (inGlobalScope) {
-    std::cout << "In global scope" << std::endl;
     spirv::StorageClass storageClass;
 
     if (auto st = getSpirvStorageClass(varType->getQualifier(TypeQualifierKind::Storage))) {

test/CodeGen/structs.glsl

@@ -0,0 +1,33 @@
+struct MyStruct {
+  float a;
+  int b;
+  uint c;
+  bool d;
+}
+
+void main() {
+    // CHECK: %0 = spirv.CompositeConstruct %cst_f32, %cst2_si32, %cst3_ui32, %true : (f32, si32, ui32, i1) -> !spirv.struct<(f32, si32, ui32, i1)>
+    MyStruct myStruct = MyStruct(0.1, 2, 3u, true);
+
+    // CHECK: %3 = spirv.CompositeExtract %2[0 : i32] : !spirv.struct<(f32, si32, ui32, i1)>
+    // CHECK-NEXT: %4 = spirv.Variable : !spirv.ptr<f32, Function>
+    // CHECK-NEXT: spirv.Store "Function" %4, %3 : f32
+    float a = myStruct.a;
+
+    // CHECK: %6 = spirv.CompositeExtract %5[1 : i32] : !spirv.struct<(f32, si32, ui32, i1)>
+    // CHECK-NEXT: %7 = spirv.Variable : !spirv.ptr<si32, Function>
+    // CHECK-NEXT: spirv.Store "Function" %7, %6 : si32
+    int b = myStruct.b;
+
+    // CHECK: %9 = spirv.CompositeExtract %8[2 : i32] : !spirv.struct<(f32, si32, ui32, i1)>
+    // CHECK-NEXT: %10 = spirv.Variable : !spirv.ptr<ui32, Function>
+    // CHECK-NEXT: spirv.Store "Function" %10, %9 : ui32
+    uint c = myStruct.c;
+
+    // CHECK: %12 = spirv.CompositeExtract %11[3 : i32] : !spirv.struct<(f32, si32, ui32, i1)>
+    // CHECK-NEXT: %13 = spirv.Variable : !spirv.ptr<i1, Function>
+    // CHECK-NEXT: spirv.Store "Function" %13, %12 : i1
+    bool d = myStruct.d;
+
+    return;
+}