OpenGL functions in QGraphicsItem::paint

[Lendrick]

Greets!

I read recently that it's possible to use OpenGL functions inside a QGraphicsItem's paint function, provided that you're working with an opengl surface. Is this something that's actually supported and will continue to work?

[JohannesMunk]

Hi!


void CGL3dProjectedItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
painter->beginNativePainting();
... do your native gl... stuff

painter->endNativePainting();
}


These two functions begin/endNativePainting() were introduced recently in 4.6 just for the purpose of making intermixing safer.



http://labs.trolltech.com/blogs/2010/01/06/qt-graphics-and-performance-opengl/ see section mixing..

The QtOpenGL bindings are just a convenience-wrapper. For more advanced stuff it is expected to use opengl directly.

Joh