In This Posting, I had asked myself whether my problems in getting the OGRE 1.10 OpenGL 3+ Rendering Engine to run under Mesa Drivers, was due to Desktop Compositing.
And the answer seems to be No.
There are certain operations related to Geometry Shaders, which Mesa Drivers still do not support, even though they claim to be OpenGL 3.3 -capable.
One of them is ‘Render To Vertex Buffer’.
And another is ‘
glBeginTransformFeedback()‘ / ‘
The Mesa Drivers report all this as invalid OpenGL operations, even though I know that these are all valid capabilities, of certain other Drivers.