QOpenGLContext used in multithread



  • Hi,guys.I met a problem. I used QGraphicsView to display 3D animation by integration with OpenSceneGraph.Meanwhile i capture QGraphicsView's image to generate a video file.

    In main thread i use (dynamic_cast<QOpenGLWidget *>(m_pGraphicsView->viewport()))->context()->functions()->glReadPixels() ,it can work,but the animation will be nonfluency.

    So I create another thread to capture QGraphicsView's image to generate a video file.So i pass m_pGraphicsView to thread,and use same code.But in this thread i can't capture image, :(.

    I find somebody says the problem is QOpenGLContext can't be used in another thread,they use QOpenGLContext->moveToThread,etc. I don't understand well.

    Can any one help me? I list my code snippet:

    void CMainWindow::recordView()
    {

       m_pAVIGenerator = new FFMPEG(m_pGraphicsView);
       m_pAVIGenerator->SetupVideo(filePath, 1480, 920, 25, 10, 40000000);
       m_pAVIGenerator->start();
        //m_pAVIGenerator is my another thread
    

    }

    void FFMPEG::run()
    {

    while (!mNeedStop)
    {
    	QImage image(1480, 920, QImage::Format_RGB888);
    	(dynamic_cast<QOpenGLWidget *>(m_pView->viewport()))->context()->functions()->glReadPixels(192, 0, 1480, 920, GL_RGB, GL_UNSIGNED_BYTE, image.bits());
                ..........
    	WriteFrame((char *)image.bits());
    }
    

    }

    How can i change these code?Thanks for your patient read my problem!


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