[Qt-interest] When OpenGL Initialization happens? (QGraphicsScene - OpenGL glBegin/glEnd)

[Samuel Rødal]

fungos wrote:
> Ok, but when we use _only_ QGraphicsView + QGraphicsScene, it does use
> QGLWidget internally? How can I then call makeCurrent when holding
> only QGraphicsView and/or QGraphicsScene?

If you want QGraphicsView to render using OpenGL you need to explicitly 
call QGraphicsView::setViewport() with a QGLWidget, like this:

QGraphicsView view;

...

QGLWidget *widget = new QGLWidget;
view.setViewport(widget);

And then you can do widget->makeCurrent() and do the initialization that 
you require.

I suggest you read this Qt Quarterly article for more information on how 
to mix OpenGL and QGraphicsView:

http://doc.trolltech.com/qq/qq26-openglcanvas.html

--
Samuel