subroutines test

shaders/frag5.glsl

@@ -1,11 +1,13 @@
 // A+B
-// ---------
-// IN: 5 / 6
-// OUT: 7
+// ------------
+// IN: 5 (FX A)
+// IN: 6 (FX B)
+// OUT: 7 (MFX)
 
 in vec2 vUV;
 layout(location = 7) out vec3 fragColor;
 
 void main() {
+    // TODO subroutine
     fragColor = texture(frame5, vUV).xyz + texture(frame6, vUV).xyz;
 }