QQuickRenderControl Example | Qt Quick 5.13.0

Qt 5.13 | Qt Quick | QQuickRenderControl Example

Qt 5.13.0 Reference Documentation

# QQuickRenderControl Example

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      #ifndef WINDOW_MULTITHREADED_H
      #define WINDOW_MULTITHREADED_H

      #include <QWindow>
      #include <QMatrix4x4>
      #include <QThread>
      #include <QWaitCondition>
      #include <QMutex>

      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 QuickRenderer : public QObject
      {
          Q_OBJECT

      public:
          QuickRenderer();

          void requestInit();
          void requestRender();
          void requestResize();
          void requestStop();

          QWaitCondition *cond() { return &m_cond; }
          QMutex *mutex() { return &m_mutex; }

          void setContext(QOpenGLContext *ctx) { m_context = ctx; }
          void setSurface(QOffscreenSurface *s) { m_surface = s; }
          void setWindow(QWindow *w) { m_window = w; }
          void setQuickWindow(QQuickWindow *w) { m_quickWindow = w; }
          void setRenderControl(QQuickRenderControl *r) { m_renderControl = r; }

          void aboutToQuit();

      private:
          bool event(QEvent *e) override;
          void init();
          void cleanup();
          void ensureFbo();
          void render(QMutexLocker *lock);

          QWaitCondition m_cond;
          QMutex m_mutex;
          QOpenGLContext *m_context;
          QOffscreenSurface *m_surface;
          QOpenGLFramebufferObject *m_fbo;
          QWindow *m_window;
          QQuickWindow *m_quickWindow;
          QQuickRenderControl *m_renderControl;
          CubeRenderer *m_cubeRenderer;
          QMutex m_quitMutex;
          bool m_quit;
      };

      class WindowMultiThreaded : public QWindow
      {
          Q_OBJECT

      public:
          WindowMultiThreaded();
          ~WindowMultiThreaded();

      protected:
          void exposeEvent(QExposeEvent *e) override;
          void resizeEvent(QResizeEvent *e) override;
          void mousePressEvent(QMouseEvent *e) override;
          void mouseReleaseEvent(QMouseEvent *e) override;
          bool event(QEvent *e) override;

      private slots:
          void run();
          void requestUpdate();
          void polishSyncAndRender();

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

          QuickRenderer *m_quickRenderer;
          QThread *m_quickRendererThread;

          QOpenGLContext *m_context;
          QOffscreenSurface *m_offscreenSurface;
          QQuickRenderControl *m_renderControl;
          QQuickWindow *m_quickWindow;
          QQmlEngine *m_qmlEngine;
          QQmlComponent *m_qmlComponent;
          QQuickItem *m_rootItem;
          bool m_quickInitialized;
          bool m_psrRequested;
      };

      #endif