Allow index array to be vbo or not.
Allow index array to be vbo or not.

theblacklion/pyglet,theblacklion/pyglet,mammadori/pyglet,oktayacikalin/pyglet,mammadori/pyglet,theblacklion/pyglet,theblacklion/pyglet,mammadori/pyglet,theblacklion/pyglet,mammadori/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet