window_singlethreaded.h Example File

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  #ifndef WINDOW_SINGLETHREADED_H
  #define WINDOW_SINGLETHREADED_H

  #include <QWindow>
  #include <QMatrix4x4>
  #include <QTimer>

  QT_FORWARD_DECLARE_CLASS(QOpenGLContext)
  QT_FORWARD_DECLARE_CLASS(QOpenGLFramebufferObject)
  QT_FORWARD_DECLARE_CLASS(QOffscreenSurface)
  QT_FORWARD_DECLARE_CLASS(QQuickRenderControl)
  QT_FORWARD_DECLARE_CLASS(QQuickWindow)
  QT_FORWARD_DECLARE_CLASS(QQmlEngine)
  QT_FORWARD_DECLARE_CLASS(QQmlComponent)
  QT_FORWARD_DECLARE_CLASS(QQuickItem)

  class CubeRenderer;

  class WindowSingleThreaded : public QWindow
  {
      Q_OBJECT

  public:
      WindowSingleThreaded();
      ~WindowSingleThreaded();

  protected:
      void exposeEvent(QExposeEvent *e) Q_DECL_OVERRIDE;
      void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
      void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
      void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;

  private slots:
      void run();

      void createFbo();
      void destroyFbo();
      void render();
      void requestUpdate();
      void handleScreenChange();

  private:
      void startQuick(const QString &filename);
      void updateSizes();
      void resizeFbo();

      QOpenGLContext *m_context;
      QOffscreenSurface *m_offscreenSurface;
      QQuickRenderControl *m_renderControl;
      QQuickWindow *m_quickWindow;
      QQmlEngine *m_qmlEngine;
      QQmlComponent *m_qmlComponent;
      QQuickItem *m_rootItem;
      QOpenGLFramebufferObject *m_fbo;
      bool m_quickInitialized;
      bool m_quickReady;
      QTimer m_updateTimer;
      CubeRenderer *m_cubeRenderer;
      qreal m_dpr;
  };

  #endif