[Discuss-gnuradio] Use of OpenGL in gr-qtgui

[Marcus D. Leech]

So, surfing through the gr-qtgui source code, it's not clear to me 
whether the Qt widgets use OpenGL rendering or not.

If they do, then are the Qt widgets equally-likely to provoke some of 
the horrible problems I've seen with the OpenGL in
  WxWidgets used in Gnu Radio?

The OpenGL "eco-system" seems to break randomly, even for 
apparently-correct applications, particularly when the DRM
  is used in the X server, but only on certain hardware.  This makes it 
difficult to predict whether a given Gnu Radio application
  will at some point fail, when run on hardware whose 
OpenGL/DRM/whatever-the-heck has bugs.

I started looking at Qt (the GRC instance in particular) to see if I 
could perhaps avoid the whole flakiness in the OpenGL
  eco-system, but if Qt in turn uses OpenGL to render certain things, 
then perhaps that's not a wise thing to do?


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org