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();
}

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

To copy to clipboard, switch view to plain text mode 

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...rmance-opengl/ see section mixing..

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

Joh