Scene cutover and LoadingScene sample.

src/dawn/game/DawnGame.cpp

@@ -40,10 +40,18 @@ int32_t DawnGame::update(float_t delta) {
     this->sceneToCutTo = nullptr;
   }
 
+  if(this->closeRequested) {
+    return DAWN_GAME_UPDATE_RESULT_EXIT;
+  }
+
   return DAWN_GAME_UPDATE_RESULT_SUCCESS;
 }
 
 void DawnGame::sceneCutover(Scene *scene) {
   if(scene == nullptr) scene = this->scene;
   this->sceneToCutTo = scene;
+}
+
+void DawnGame::close() {
+  this->closeRequested = true;
 }

src/dawn/game/DawnGame.hpp

@@ -25,6 +25,7 @@ namespace Dawn {
   class DawnGame {
     private:
       Scene *sceneToCutTo = nullptr;
+      bool_t closeRequested = false;
 
     public:
       DawnHost *host;
@@ -75,6 +76,11 @@ namespace Dawn {
        * @param scene Scene to cut over to.
        */
       void sceneCutover(Scene *scene);
+
+      /**
+       * Gracefully requests that the game should be closed as soon as possible.
+       */
+      void close();
   };
 
   /**