diff -r 12618cd83af8 -r 92e5682810d4 qmlfrontend/game_view.h
--- a/qmlfrontend/game_view.h	Sat Nov 24 21:57:01 2018 +0100
+++ b/qmlfrontend/game_view.h	Sat Nov 24 23:51:45 2018 +0100
@@ -3,49 +3,62 @@
 
 #include <QQuickItem>
 
+#include <QPointer>
+#include <QScopedPointer>
 #include <QtGui/QOpenGLFunctions>
 #include <QtGui/QOpenGLShaderProgram>
 
+#include "engine_instance.h"
+
 class GameViewRenderer : public QObject, protected QOpenGLFunctions {
   Q_OBJECT
  public:
-  GameViewRenderer() : m_delta(0) {}
+  GameViewRenderer();
   ~GameViewRenderer();
 
-  void tick(quint32 delta) { m_delta = delta; }
+  void tick(quint32 delta);
   void setViewportSize(const QSize& size);
+  void setEngineInstance(EngineInstance* engineInstance);
 
  public slots:
   void paint();
 
  private:
   quint32 m_delta;
+  QPointer<EngineInstance> m_engineInstance;
 };
 
 class GameView : public QQuickItem {
   Q_OBJECT
 
+  Q_PROPERTY(EngineInstance* engineInstance READ engineInstance WRITE
+                 setEngineInstance NOTIFY engineInstanceChanged)
+
  public:
   GameView();
 
   Q_INVOKABLE void tick(quint32 delta);
 
+  EngineInstance* engineInstance() const;
+
  signals:
-  void tChanged();
+  void engineInstanceChanged(EngineInstance* engineInstance);
 
  public slots:
   void sync();
   void cleanup();
+  void setEngineInstance(EngineInstance* engineInstance);
 
  private slots:
   void handleWindowChanged(QQuickWindow* win);
 
  private:
   quint32 m_delta;
-  GameViewRenderer* m_renderer;
+  QScopedPointer<GameViewRenderer> m_renderer;
   bool m_windowChanged;
   qint32 m_centerX;
   qint32 m_centerY;
+  QPointer<EngineInstance> m_engineInstance;
 };
 
 #endif  // GAMEVIEW_H