QGraphicsScene OpenGL rendering

[nelisdnurste]

Hi forum,

I'm currently making a pong game, I heard that using openGL rendering can reduce the load on the CPU and direct it to the GPU. Im using the QGraphicsScene as my 2D gameworld. Does anyone know how to let QGraphicsScene use OpenGL while rendering the graphics?

Thanks in advance,

Niels

[dkoryagin]

something like this:

ui->mapView->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers | QGL::DirectRendering)));
ui->mapView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
ui->mapView->update();

ui->mapView->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers | QGL::DirectRendering)));
ui->mapView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
ui->mapView->update();

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rtfm =)

[nelisdnurste]

I'd like a normal response, and it isn't in the manual

[user14921]

http://doc.qt.nokia.com/qq/qq26-openglcanvas.html

[mpita]

You can add a QGLWidget as viewport of your graphic view. Example:

myGraphicsView->setViewport(new QGLWidget());

myGraphicsView->setViewport(new QGLWidget());

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This enable the GL acceleration while drawing your scene.

You can also specify what kind of options must be enabled, and you can do this through QGLFormat parameter, as said dkoryagin:

myGraphicsView->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers | QGL::DirectRendering)));

myGraphicsView->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers | QGL::DirectRendering)));

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You'll find all the available Format options (that at the moment I don't remember) here. Warning, is the manual :P :

http://doc.qt.nokia.com/stable/qgl.h...matOption-enum


Ciao,
Marco