Better scene management.

include/Engine/Globals.h

@@ -4,10 +4,22 @@
 #include <Engine/GameWindow.h>
 
 namespace Globals {
+    inline std::vector<Scene*> SceneList{};
     inline Scene* CurrentScene = nullptr;
     inline DemoGameWindow* Window = nullptr;
 
     inline float DeltaTime() { return Window->GetDeltaTime(); }
-    inline void RemoveScene() { delete CurrentScene; CurrentScene = nullptr; }
-    inline void ChangeScene(Scene* scene) { delete CurrentScene; CurrentScene = scene; CurrentScene->Init(); }
+    inline void ChangeScene(Scene* scene) { if (CurrentScene != nullptr) CurrentScene->Unload(); CurrentScene = scene; if (CurrentScene != nullptr) CurrentScene->Init(); }
+    inline bool ChangeScene (const std::string& scene_name)
+    {
+        Scene* scene = nullptr;
+        for (auto* s : SceneList)
+            if (s->GetName() == scene_name)
+                scene = s;
+
+        if (scene)
+            ChangeScene(scene);
+
+        return scene;
+    }
 }