resources/sksl/shared/VertexIDInFunction.vert - skia - Git at Google

 layout(location=1) out int id;

 noinline int fn() {
     return sk_VertexID;
 }

 void main() {
     id = fn();
 }
	layout(location=1) out int id;

	noinline int fn() {
	return sk_VertexID;
	}

	void main() {
	id = fn();
	}