Add a test for enhanced layouts.

reference/shaders/desktop-only/comp/enhanced-layouts.comp

@@ -0,0 +1,14 @@
+#version 450
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+
+struct Foo
+{
+    int a;
+    int b;
+    int c;
+};
+
+void main()
+{
+}
+

shaders/desktop-only/comp/enhanced-layouts.comp

@@ -0,0 +1,37 @@
+#version 450
+
+struct Foo
+{
+	int a;
+	int b;
+	int c;
+};
+
+layout(std140, binding = 0) uniform UBO
+{
+	layout(offset = 4) int a;
+	layout(offset = 8) int b;
+	layout(offset = 16) Foo foo;
+	layout(offset = 48) int c[8];
+} ubo;
+
+layout(std140, binding = 1) buffer SSBO1
+{
+	layout(offset = 4) int a;
+	layout(offset = 8) int b;
+	layout(offset = 16) Foo foo;
+	layout(offset = 48) int c[8];
+} ssbo1;
+
+layout(std430, binding = 2) buffer SSBO2
+{
+	layout(offset = 4) int a;
+	layout(offset = 8) int b;
+	layout(offset = 16) Foo foo;
+	layout(offset = 48) int c[8];
+} ssbo2;
+
+void main()
+{
+}
+

spirv_glsl.cpp

@@ -1114,6 +1114,7 @@ string CompilerGLSL::layout_for_variable(const SPIRVariable &var)
 			attr.push_back("std140");
 		else if (ssbo_is_packing_standard(type, BufferPackingStd140EnhancedLayout))
 		{
+			attr.push_back("std140");
 			// Fallback time. We might be able to use the ARB_enhanced_layouts to deal with this difference,
 			// however, we can only use layout(offset) on the block itself, not any substructs, so the substructs better be the appropriate layout.
 			// Enhanced layouts seem to always work in Vulkan GLSL, so no need for extensions there.