Implement camera colors

Still needs some unit tests, and to fix the gasket example

enkou-shaders-tests/src/lib.rs

@@ -64,7 +64,10 @@ mod test {
     }
 
     #[test]
-    pub fn has_entry_main_camera() {
-        assert!(has_entry_point(ExecutionModel::GLCompute, "main_camera"))
+    pub fn has_entry_main_image_render() {
+        assert!(has_entry_point(
+            ExecutionModel::GLCompute,
+            "main_image_render"
+        ))
     }
 }