window_multithreaded.h Example File

rendercontrol/window_multithreaded.h
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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