diff --git a/Sources/backends/hlsl.c b/Sources/backends/hlsl.c
index e2851c3..94564a7 100644
--- a/Sources/backends/hlsl.c
+++ b/Sources/backends/hlsl.c
@@ -513,6 +513,9 @@ static void write_functions(char *hlsl, size_t *offset, shader_stage stage, func
 					global g = get_global(j);
 					if (o->op_load_member.from.index == g.var_index) {
 						global_var_index = g.var_index;
+						if (get_type(g.type)->built_in) {
+							global_var_index = 0;
+						}
 						break;
 					}
 				}
diff --git a/tests/in/test.kong b/tests/in/test.kong
index 9f9d7db..03baccf 100644
--- a/tests/in/test.kong
+++ b/tests/in/test.kong
@@ -62,6 +62,20 @@ fun sendrays(): void {
     var target: float3 = float3((uv.x * 2 - 1) * 1.8 * (size.x / size.y),
                            (1 - uv.y) * 4 - 2 + camera.y,
                            0);
+
+    //RayDesc ray;
+    //ray.Origin = camera;
+    //ray.Direction = target - camera;
+    //ray.TMin = 0.001;
+    //ray.TMax = 1000;
+
+    var payload: Payload;
+    payload.allow_reflection = true;
+    payload.missed = false;
+
+    //TraceRay(scene, RAY_FLAG_NONE, 0xFF, 0, 0, 0, ray, payload);
+
+    //uav[idx] = float4(payload.color, 1);
 }
 
 fun raymissed(payload: Payload): void {