added quad primitive, shortcuts and safe entity deletion

open_engine/include/open_engine/scene/scene.hpp

@@ -3,6 +3,7 @@
 
 #include "open_engine/renderer/editor_camera.hpp"
 
+#include <entt/entity/fwd.hpp>
 #include <entt/entt.hpp>
 #include <cstdint>
 
@@ -13,11 +14,14 @@ namespace OpenEngine {
     class Scene
     {
         public:
-            Scene() {};
+            Scene() = default;
             ~Scene() = default;
 
             Entity CreateEntity(const std::string& name = std::string());
-            void DeleteEntity(Entity entity);
+            void DeleteEntity(entt::entity entity);
+            void MarkEntityForDeletion(Entity entity);
+
+            void UpdateEntities();
 
             void OnUpdateRuntime();
             void OnUpdateEditor(EditorCamera& camera);
@@ -36,6 +40,8 @@ namespace OpenEngine {
 
             uint32_t viewport_width = 0, viewport_height = 0;
 
+            std::vector<entt::entity> entities_to_be_deleted;
+
             friend class SceneSerializer;
             friend class Entity;
     };