Comment and add more ModuleRegistrationLevels.

modules/register_module_types.h

@@ -30,14 +30,40 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+// Note: The engine will call register_module_types in this order, 
+// and in reverse order (except for start and finalize) when it goes through unregister_module_types.
+
 enum ModuleRegistrationLevel {
-	MODULE_REGISTRATION_LEVEL_CORE = 0,
+	// Starting initialization, on uninitialization
+	MODULE_REGISTRATION_LEVEL_START = 0,
+
+	// Set up your singletons here.
+	MODULE_REGISTRATION_LEVEL_SINGLETON,
+
+	// Set up things like resource loaders here.
+	MODULE_REGISTRATION_LEVEL_CORE,
+
+	// Set up driver level things here.
     MODULE_REGISTRATION_LEVEL_DRIVER,
+
+	// Set up platform level things here.
 	MODULE_REGISTRATION_LEVEL_PLATFORM,
+
+	// Set up servers here
 	MODULE_REGISTRATION_LEVEL_SERVER,
+
+	// Set up scene related things here. (Mostly normal class registrations.)
 	MODULE_REGISTRATION_LEVEL_SCENE,
+
+	// Set up scene related things here. (Mostly editor class registrations.)
 	MODULE_REGISTRATION_LEVEL_EDITOR,
+
+	// Set up testing related things here. Will only get called if necessary. (Mostly test registrations.)
     MODULE_REGISTRATION_LEVEL_TEST,
+
+	// After everything have been set up, or uninitialized.
+	// Good place to change some settings, or maybe to do something like disabling an another modules's editor plugin when necessary.
+	MODULE_REGISTRATION_LEVEL_FINALIZE,
 };
 
 void register_module_types(ModuleRegistrationLevel p_level);