Drag'n'drop for components

+ Added CreateInstance to ScriptClass
+ Added CreateComponentInstance to ScriptInstance

GlitchyEditor/SandboxProject/Assets/Scripts/MyTestEntity.cs

@@ -66,7 +66,12 @@ namespace Sandbox
 
             Log.Info($"Jump Force: {JumpForce}");
 
-            _rigidBody ??= GetComponent<RigidBody2D>() ?? AddComponent<RigidBody2D>();
+            //_rigidBody ??= GetComponent<RigidBody2D>() ?? AddComponent<RigidBody2D>();
+
+            if (_rigidBody == null)
+            {
+                Log.Error("_rigidBody was not set in editor.");
+            }
 
             if (Camera == null)
             {

GlitchyEditor/content/Scenes/physics2D.scene

@@ -72,7 +72,7 @@
 				Color = {
 					R = 1,
 					G = 0.941887021,
-					B = 0.401484519,
+					B = 0.401484489,
 					A = 1
 				},
 				Sprite = "",
@@ -162,7 +162,7 @@
 				OrthographicHeight = 10,
 				OrthographicNearPlane = 0,
 				OrthographicFarPlane = 10,
-				AspectRatio = 1.17151165,
+				AspectRatio = 2.05582929,
 				FixedAspectRatio = false
 			},
 			ScriptComponent = {
@@ -195,8 +195,8 @@
 			},
 			TransformComponent = {
 				Position = {
-					X = -0.121203199,
-					Y = 0.660161018,
+					X = -0.121203206,
+					Y = 0.660161078,
 					Z = 0
 				},
 				Rotation = {
@@ -234,7 +234,7 @@
 			ScriptComponent = {
 				ScriptClass = "Sandbox.MyTestEntity",
 				Fields = [
-					_rigidBody = (Component)0,
+					_rigidBody = (Component)15710354273720487680,
 					TheEntity = (Entity)0,
 					JumpForce = (Float)200,
 					MoveForce = (Float)148,
@@ -276,7 +276,7 @@
 				Color = {
 					R = 0.985467017,
 					G = 1,
-					B = 0.569977999
+					B = 0.569977939
 				}
 			}
 		},
@@ -323,8 +323,8 @@
 			SpriteRendererComponent = {
 				Color = {
 					R = 0.425658971,
-					G = 0.855207503,
-					B = 0.0558161139,
+					G = 0.855207443,
+					B = 0.0558161177,
 					A = 1
 				},
 				Sprite = "",
@@ -338,14 +338,14 @@
 			TransformComponent = {
 				Position = {
 					X = 6.74610233,
-					Y = -2.03225923,
+					Y = -2.03225946,
 					Z = 0
 				},
 				Rotation = {
 					X = 0,
 					Y = 0,
 					Z = -0.331792623,
-					W = 0.943352461
+					W = 0.94335258
 				},
 				Scale = {
 					X = 5.29557419,
@@ -399,8 +399,8 @@
 			},
 			TransformComponent = {
 				Position = {
-					X = 15.2321291,
-					Y = -1.98709261,
+					X = 15.2321281,
+					Y = -1.98709273,
 					Z = 0
 				},
 				Rotation = {
@@ -410,7 +410,7 @@
 					W = 0.990847468
 				},
 				Scale = {
-					X = 13.9764547,
+					X = 13.9764528,
 					Y = 1,
 					Z = 1
 				},
@@ -462,13 +462,13 @@
 			TransformComponent = {
 				Position = {
 					X = -6.27842855,
-					Y = 2.62550187,
+					Y = 2.62550163,
 					Z = 0
 				},
 				Rotation = {
 					X = 0,
 					Y = 0,
-					Z = 0.187087849,
+					Z = 0.187087879,
 					W = 0.982343197
 				},
 				Scale = {
@@ -497,7 +497,7 @@
 				},
 				Density = 1,
 				Friction = 0.5,
-				Restitution = 0.899999917,
+				Restitution = 0.899999857,
 				RestitutionThreshold = 0.5
 			}
 		}

GlitchyEditor/src/EditWindows/ComponentEditWindow.bf

@@ -817,11 +817,22 @@ namespace GlitchyEditor.EditWindows
 					// TODO: I don't like the fact, that we are using mono directly
 
 					ScriptField scriptField = scriptClass.Fields[fieldName];
-					MonoReflectionType* reflectionType = Mono.mono_type_get_object(ScriptEngine.[Friend]s_AppDomain, scriptField.GetMonoType());
 
-					// TODO: We shouldn't abuse the script glue like that...
-					// ScriptGlue should only be called by C#, not by Beef...
-					allowDrop = ScriptGlue.[Friend]Entity_HasComponent(draggedEntity.UUID, reflectionType);
+					// For some reason we have to retrieve the MonoType like this. Using scriptField.GetMonoType() directly returns the wrong type...
+					MonoReflectionType* reflectionType = Mono.mono_type_get_object(ScriptEngine.[Friend]s_AppDomain, scriptField.GetMonoType());
+					MonoType* actualMonoType = Mono.mono_reflection_type_get_type(reflectionType);
+
+					// TODO: We shouldn't abuse the script glue like that.
+					// ScriptGlue should only be called by C#, not by Beef.
+					if (ScriptGlue.[Friend]s_HasComponentMethods.TryGetValue(actualMonoType, let has_component))
+					{
+						allowDrop = has_component(draggedEntity);
+					}
+					else
+					{
+						Log.EngineLogger.Warning($"No HasComponent-Function found for field {scriptField.Name}");
+						allowDrop = false;
+					}
 				}
 
 				if (allowDrop)

GlitchyEngine/src/Scripting/ScriptClass.bf

@@ -284,6 +284,16 @@ class ScriptClass : SharpClass
 		return instance;
 	}
 
+	public MonoObject* CreateInstance()
+	{
+		MonoObject* instance = Mono.mono_object_new(ScriptEngine.[Friend]s_AppDomain, _monoClass);
+
+		// Invoke empty constructor to fill fields
+		Mono.mono_runtime_object_init(instance);
+
+		return instance;
+	}
+
 	public MonoMethod* GetMethod(StringView name, int argCount = 0)
 	{
 		return Mono.mono_class_get_method_from_name(_monoClass, name.ToScopeCStr!(), argCount);

GlitchyEngine/src/Scripting/ScriptEngine.bf

@@ -179,6 +179,8 @@ static class ScriptEngine
 		GetCoreAttributes();
 		GetCoreClasses();
 		
+		GetComponentsFromAssemblies();
+
 		GetEntitiesFromAssemblies();
 
 		ScriptGlue.RegisterManagedComponents();
@@ -214,13 +216,13 @@ static class ScriptEngine
 
 		script.Instance.Instantiate(entity.UUID);
 
-		//CopyEditorFieldsToInstance(entity, script);
-
 		return true;
 	}
 
 	public static void CopyEditorFieldsToInstance(Entity entity, ScriptComponent* script)
 	{
+		Log.EngineLogger.AssertDebug(script.Instance != null);
+
 		// Technically the map is for a different entity (namely the editor-entity),
 		// however the UUID is the same, so we get the correct field map
 		let fields = GetScriptFieldMap(entity);
@@ -242,7 +244,17 @@ static class ScriptEngine
 				MonoObject* referencedEntity = GetManagedInstance(referencedId);
 				script.Instance.SetFieldValue(scriptField, referencedEntity);
 			case .Component:
+				// We create a new instance of a component class
+				MonoType* type = scriptField.GetMonoType();
 				
+				SharpType sharpType = ScriptEngine.GetSharpType(type);
+
+				var componentClass = ComponentClasses[sharpType.FullName];
+
+				MonoObject* componentInstance = script.Instance.CreateComponentInstance(componentClass);
+				script.Instance.SetFieldValue(scriptField, componentInstance);
+
+				sharpType.ReleaseRef();
 			default:
 				script.Instance.SetFieldValue(scriptField, field._data);
 			}
@@ -362,13 +374,32 @@ static class ScriptEngine
 
 				Log.EngineLogger.Info($"Added entity \"{entityScript.FullName}\"");
 			}
-			// Check if it is a component
-			else if (monoClass != null && Mono.mono_class_is_subclass_of(monoClass, s_ComponentRoot.[Friend]_monoClass, false))
-			{
-				ScriptClass entityScript = new ScriptClass(StringView(nameSpace), StringView(name), s_AppAssemblyImage, .Entity);
-				_entityScripts.Add(entityScript.FullName, entityScript);
+	    }
+	}
+	private static void GetComponentsFromAssemblies()
+	{
+		ClearDictionaryAndReleaseValues!(_componentClasses);
 
-				Log.EngineLogger.Info($"Added entity \"{entityScript.FullName}\"");
+	    MonoTableInfo* typeDefinitionsTable = Mono.mono_image_get_table_info(s_CoreAssemblyImage, .MONO_TABLE_TYPEDEF);
+	    int32 numTypes = Mono.mono_table_info_get_rows(typeDefinitionsTable);
+
+	    for (int32 i = 0; i < numTypes; i++)
+	    {
+	        int32[(.)SOME_RANDOM_ENUM.MONO_TYPEDEF_SIZE] cols = .();
+	        Mono.mono_metadata_decode_row(typeDefinitionsTable, i, (.)&cols, (.)SOME_RANDOM_ENUM.MONO_TYPEDEF_SIZE);
+
+	        char8* nameSpace = Mono.mono_metadata_string_heap(s_CoreAssemblyImage, (.)cols[(.)SOME_RANDOM_ENUM.MONO_TYPEDEF_NAMESPACE]);
+			char8* name = Mono.mono_metadata_string_heap(s_CoreAssemblyImage, (.)cols[(.)SOME_RANDOM_ENUM.MONO_TYPEDEF_NAME]);
+			
+			MonoClass* monoClass = Mono.mono_class_from_name(s_CoreAssemblyImage, nameSpace, name);
+			
+			// Check if it is a component but not the root Component class
+			if (monoClass != null && monoClass != s_ComponentRoot.[Friend]_monoClass && Mono.mono_class_is_subclass_of(monoClass, s_ComponentRoot.[Friend]_monoClass, false))
+			{
+				ScriptClass componentClass = new ScriptClass(StringView(nameSpace), StringView(name), s_CoreAssemblyImage, .Component);
+				_componentClasses.Add(componentClass.FullName, componentClass);
+
+				Log.EngineLogger.Info($"Added component \"{componentClass.FullName}\"");
 			}
 	    }
 	}

GlitchyEngine/src/Scripting/ScriptInstance.bf

@@ -70,4 +70,19 @@ class ScriptInstance : RefCounter
 	{
 		_scriptClass.SetFieldValue<T>(_instance, field.[Friend]_monoField, value);
 	}
+
+	/// Creates a new instance of the given component class and initializes it for the current entity.
+	public MonoObject* CreateComponentInstance(ScriptClass componentClassType)
+	{
+		MonoObject* componentInstance = componentClassType.CreateInstance();
+
+		// TODO: We could cache the property, but this might be fine
+		MonoProperty* entityProperty = Mono.mono_class_get_property_from_name(componentClassType.[Friend]_monoClass, "Entity");
+
+		MonoObject* exception = null;
+
+		Mono.mono_property_set_value(entityProperty, componentInstance, (void**)&_instance, &exception);
+
+		return componentInstance;
+	}
 }

GlitchyEngineHelper/src/Mono/Mono.bf

@@ -232,6 +232,12 @@ static class Mono
 	
 	[LinkName(.C)]
 	public static extern MonoThread* mono_thread_current();
+	
+	[LinkName(.C)]
+	public static extern MonoProperty* mono_class_get_property_from_name(MonoClass *klass, char8* name);
+	
+	[LinkName(.C)]
+	public static extern void mono_property_set_value(MonoProperty *prop, void *obj, void **@params, MonoObject **exc);
 }
 
 struct MonoDomain;
@@ -250,6 +256,8 @@ struct MonoObject;
 
 struct MonoMethod;
 
+struct MonoProperty;
+
 struct MonoThread;
 
 struct MonoException