- Qt 5.5
- Qt Quick
- QQuickRenderControl Example
- window_multithreaded.h Example File
- Qt 5.5.1 Reference Documentation

# window_multithreaded.h Example File

rendercontrol/window_multithreaded.h

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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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) Q_DECL_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) Q_DECL_OVERRIDE;
        void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
        void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
        void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
        bool event(QEvent *e) Q_DECL_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