My previous edit to this check was too lax.
OSD's shader for the Transform Feedback evaluator declares itself
#version 410 so disable the feature if user's GL < 4.1.
Fixed extension check.
This feature requires ARB_texture_buffer_object which was subsumed into
OpenGL 3.0. Intel driver on Windows doesn't claim to support this
extension, but GL version is > 3 so it actually does work.
There was a bug in OpenSubdiv library which is now fixed by updating library in
the build environments.
Still requires testing, but now being at the beginning of release cycle is
should be safe to simply enable option and let everyone to test :)
This isn't a Blender issue and the same bug happens with official OpenSubdiv
examples. For until it's either worked around from OpenSubdiv side or fixed
in the driver we'll force disable GLSL Compute for AMD hardware.
This includes C-API bindings in intern/opensubdiv and CMAke module
which finds the OpenSubdiv library. This filea are not in use so
far, making it a separate commit to make actual integration commit
more clear.
