[Qt-interest] QGLWidget Vs "-graphicssystem opengl"

[Amit Pundir]

Hi,

Please help me in understanding the difference between QGLWidget and
"-graphicssystem opengl" switch.

What will be the difference if I use QGLWidget for rendering OpenGL
graphics, and 2nd case, if I render normal widgets with opengl backend
using "-graphicssystem opengl" switch?

What is a typical usage scenario for both the cases?

I'm not a graphics expert so there are chances that this question may
sound stupid :)

Thanks for your concern.
Regards
Amit Pundir