GL_GENERATE_MIPMAP_HINT generates invalid enum with 3.3 core contex with ATI driver.
avoiding a bug i experienced on ubuntu11.10 using old ati drivers with bones and model matrix. the bug is avoided using instanced model mat (even if instance count is one, aka. only a single value per instance attribute). really strange bug
use same window title in all tests
ati driver did not like to call glDrawBuffers on screen buffer even if only single buffer specified.
ambient occlusion was using deprecated GL_INTENSITY.