Increase Frame Rate



  • Hi,

    I want to increase my frame rate. It's native fixe to 60 FPS. I need to have 75 FPS for Oculus.

    Best regards,
    Robin


  • Moderators

    How is your question related to Qt?
    What device is that?



  • Yes you're right. I send you some more contexte.

    I use the OpenGL tutorial of Qt5.5 to work (http://doc.qt.io/qt-5/qtgui-openglwindow-example.html). So I have this class :

    class OpenGLWindow : public QWindow, protected QOpenGLFunctions_4_1_Core
    {
    Q_OBJECT
    public:
    explicit OpenGLWindow(QWindow *parent = 0);
    ~OpenGLWindow();

    virtual void render(QPainter *painter);
    virtual void render();
    
    virtual void initialize();
    
    void setAnimating(bool animating);
    
    QOpenGLContext* GetContexte();
    

    public slots:
    void renderLater();
    void renderNow();

    protected:
    bool event(QEvent *event) Q_DECL_OVERRIDE;

    void exposeEvent(QExposeEvent *event) Q_DECL_OVERRIDE;
    

    private:
    bool m_update_pending;
    bool m_animating;

    QOpenGLContext* m_context;
    QOpenGLPaintDevice* m_device;
    

    };

    I set the boolean animation to true. And this function call my randerer at 60 FPS. I want to increase this value to 75 FPS.

    void OpenGLWindow::renderNow()
    {
    if (!isExposed())
    return;

    bool needsInitialize = false;
    
    if (!m_context) {
        m_context = new QOpenGLContext(this);
        m_context->setFormat(requestedFormat());
        m_context->create();
    
        needsInitialize = true;
    }
    
    m_context->makeCurrent(this);
    
    if (needsInitialize) {
        initializeOpenGLFunctions();
        initialize();
    }
    
    render();
    
    m_context->swapBuffers(this);
    
    if (m_animating)
        renderLater();
    

    }



  • Ok,
    So I put the Swap Interval to 0 and I use a QTimer like this :

    QTimer *timer = new QTimer();
    connect(timer, SIGNAL(timeout()), this, SLOT(renderLater()));
    timer->start(1000/75);
    

    And it's works ^^


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