refactor rendering

include/td/render/Camera.h

@@ -1,20 +1,12 @@
 #pragma once
 
 #include <td/Maths.h>
-#include <td/misc/ObjectNotifier.h>
+#include <td/misc/Signal.h>
 
 namespace td {
 namespace render {
 
-class ICameraListener {
-  public:
-	virtual void OnPerspectiveChange() {}
-	virtual void OnViewChange() {}
-};
-
-using CameraNotifier = utils::ObjectNotifier<ICameraListener>;
-
-class Camera : public CameraNotifier {
+class Camera {
   private:
 	Mat4f m_ViewMatrix;
 	Mat4f m_ProjectionMatrix;
@@ -29,6 +21,9 @@ class Camera : public CameraNotifier {
 	float m_Pitch = -PI / 2.0f + 0.0000001f;
 
   public:
+	utils::Signal<> OnPerspectiveChange;
+	utils::Signal<> OnViewChange;
+
 	const Mat4f& GetViewMatrix() const {
 		return m_ViewMatrix;
 	}