camera notify

include/td/misc/ObjectNotifier.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <algorithm>
+#include <functional>
+#include <vector>
+
+namespace td {
+namespace utils {
+
+template <typename Listener>
+class ObjectNotifier {
+protected:
+	std::vector<Listener*> m_Listeners;
+
+public:
+	void BindListener(Listener* listener) {
+		m_Listeners.push_back(listener);
+	}
+
+	void UnbindListener(Listener* listener) {
+		auto iter = std::find(m_Listeners.begin(), m_Listeners.end(), listener);
+
+		if (iter == m_Listeners.end()) return;
+
+		m_Listeners.erase(iter);
+	}
+
+	template <typename Func, typename... Args>
+	void NotifyListeners(Func function, Args... args) {
+		for (Listener* listener : m_Listeners)
+			std::bind(function, listener, args...)();
+	}
+};
+
+} // namespace utils
+} // namespace td

include/td/render/Camera.h

@@ -1,11 +1,20 @@
 #pragma once
 
 #include <td/Maths.h>
+#include <td/misc/ObjectNotifier.h>
 
 namespace td {
 namespace render {
 
-class Camera {
+class ICameraListener {
+  public:
+	virtual void OnPerspectiveChange() {}
+	virtual void OnViewChange() {}
+};
+
+using CameraNotifier = utils::ObjectNotifier<ICameraListener>;
+
+class Camera : public CameraNotifier {
   private:
 	Mat4f m_ViewMatrix;
 	Mat4f m_ProjectionMatrix;

include/td/render/renderer/WorldRenderer.h

@@ -8,7 +8,7 @@
 namespace td {
 namespace render {
 
-class WorldRenderer : public Renderer {
+class WorldRenderer : public Renderer, public ICameraListener {
   private:
 	const game::World& m_World;
 	shader::WorldShader m_Shader;
@@ -19,6 +19,9 @@ class WorldRenderer : public Renderer {
 	virtual ~WorldRenderer();
 
 	virtual void Render() override;
+
+	virtual void OnPerspectiveChange() override;
+	virtual void OnViewChange() override;
 };
 
 }  // namespace render