How to properly trigger paintGL function ?

Dariusz

Hey

I'm trying to do some performance tests but I struggle with the way I need to trigger openGL to repaint.

Esentially if I use

Update()
float desiredFps = 1000.0f;
repaintTimer = new QTimer(this);
QObject::connect(repaintTimer, &QTimer::timeout, = { update(); });
repaintTimer->start(0); //time specified in ms
I'm limited to 60fps in my tests.

If I use repaint
float desiredFps = 1000.0f;
repaintTimer = new QTimer(this);
QObject::connect(repaintTimer, &QTimer::timeout, = { repaint(); });
repaintTimer->start(0); //time specified in ms
60fps again.

but if I use
float desiredFps = 1000.0f;
repaintTimer = new QTimer(this);
QObject::connect(repaintTimer, &QTimer::timeout, = { paintGL(); });
repaintTimer->start(0); //time specified in ms
I hit like 9000-10000+ fps(since its empty function) but as I also use a

frames++;
QPainter painter(this);
painter.beginNativePainting();
glDisable(GL_DEPTH_TEST);
painter.endNativePainting();


painter.setPen(Qt::red);
painter.setFont(fpsFont);
painter.drawText(10, 20, QString::number(cFps));
painter.end();

to draw the fps as a text, but that does not refresh properly with paintGL... so how am I to properly draw/update the widget?

TIA

Dariusz

Ok solved

It appears that a GLOBAL surface setInterval overrides the setIntervals I did on my glWidget. Kinda weird that the global one overrides local one if local one was specified, is this a bug ?

format.setSwapInterval(0);
QSurfaceFormat::setDefaultFormat(format);

overrides on widget >

QSurfaceFormat format;
format.setSwapInterval(0);
setFormat(format);