This reverts commit f72475b557, reversing
changes made to 0c89c85aae.
Sorry Generic this branch is really cool but it needs more work. I shouldn't have merged it too early...
Two reasons:
- Makes it more straight-forward to add brightmaps to the non-power-of-two rendering functions.
- Made it easier to split off brightmap rendering. Hopefully improves performance, but I haven't thoroughly tested this.
