Alexander Powell:

Alexander Powell:

Add MAC OS X Render Texture support:

Most texture modes seem to work on my Powerbook, but I don't have a wide array
of machines to test it on otherwise.

If you have problems, please let me know and I'll see if I can help track down
the source of the bug.  I'd love to keep working on it if time permits (I use
RenderTexture in a few other projects), so I'll keep you informed if there are
any changes that I make for the better.