Hardware Accerlation problem - Viewport(new GLWidget())

qtd1d1

Hi,

somehow the Hardware Accerlation with GLWidget doesn't work.
I think I am missing something trivial.

thats how my code looks like:

@ int main(int argc, char *argv[])
{
QApplication a(argc, argv);
a.setGraphicsSystem("native");

QGraphicsScene scene;
scene.setSceneRect(0.0, 0.0, 500.0, 500.0&#41;;


QGraphicsView view(&scene);
view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

QGLFormat fmt = QGLFormat::defaultFormat();

fmt.setDoubleBuffer(true);
fmt.setSwapInterval(1);

QGLWidget* glWidget = new QGLWidget(fmt);

view.setGeometry(0, 0, 500, 500);
view.setViewport(glWidget);

view.setViewportUpdateMode(
            QGraphicsView::FullViewportUpdate);

view.viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
view.viewport()->setAttribute(Qt::WA_NoSystemBackground);


MainWindow w(&scene);

view.show();

return a.exec&#40;&#41;;

}@

The cpu load is still quite heavy (~90 %)

Does anyone has an idea why it's not working?
I am using the same settings with a QML/C++ application and it works fine .. with hardware accerlation.

Thanatos.jsse

I have the same problem.
I've been testig "this example":http://doc.qt.nokia.com/qq/qq26-openglcanvas.html, but don't work on my archlinux. The line of code:

@view.setViewport(glWidget);@

don't work poperly.

BR,

qtd1d1

What kind of hardware do you use? Did you write a display driver by yourself?

I am using the i.MX53 with the simpleGL display driver.

qtd1d1

I tested my example on Windows XP. It's exactly the same problem.
I think my problem is somewhere in the code...

andre

Do your openGL samples like Gears work properly and hardware accelerated?

Thanatos.jsse

[quote author="qtd1d1" date="1327678090"]What kind of hardware ...[/quote]

I'm using a simple Intel chipset with vesa driver, but there is no problem. I have too a Xp 64 and have the same problem.

When I try to set OpenGL render engine to the QGraphicsView via
@QGraphicsView::setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers));@

[quote author="Andre" date="1327699046"]Do your openGL samples like Gears work properly and hardware accelerated?[/quote]
I'm tested the drivers and OpenGl configuration, the QtOpenGl examples work well.

qtd1d1

Yes, exactly. My drivers work correctly, too. I've tested some QML and Qt Widgets Examples. The Hardware Accerlation is working fine. But I can't get it to go with my own application...

qtd1d1

Maybe it's necessary to implement the QGLWidget by your own. I will try that and post the results later

qtd1d1

Ok, I solved the problem.

It was actually hardware accerlated but, the problem on the target was the caching.
I commented this line in my QGraphicsPixmapItem out:

@//setCacheMode(DeviceCoordinateCache);@

Hope this helps

Thanatos.jsse

Ok, I'll check that..

Thank you.

BR,