Increase Frame Rate

? Offline

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

jsulm

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

? Offline

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();

}

? Offline

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 ^^