[Qt5-feedback] OpenGL ES 2.0 requirement

[Ant]

So without GL 2, it can fall back to a software implementation.  But 
what if you have hardware OpenGL < 2 (eg. 1.5) and need hardware 
acceleration in QGLWidgets?  Can you mix hardware and software?

Upcoming hardware may well support GL 2, but there is a lot of old 
hardware that is perfectly good for common tasks.  Perhaps Qt4 should be 
supported for longer?  You should still be able to run the latest 
software and distributions on these machines, and this may be a barrier 
to Qt5 uptake.

> We don't have such a software renderer yet, but maybe someone is willing to help us in getting it.
Is it premature to be making this decision given there is no guarantee 
there will be one?

To me it seems wrong that a cross platform UI toolkit should be so 
dependant on hardware, or that rendering core widgets is slow enough for 
hardware acceleration to make an appreciable difference.  Accelerating 
individual components such as 3d, graphics view and video seems more 
appropriate and should be at the discretion of the application developer 
not the toolkit provider.

cheers