You video init log states:
Code: Select all
...GL_ARB_fragment_program not found
This causes r_gammamethod 2 to not work and it's rather unusual in 2016. You could try upgrading your mesa but I guess R200 has been minimally maintained for years so I wouldn't count on that. Or try switching between gallium/classic driver, if you know how on your distro.
Still the game should work fine, just without proper gamma correction/overbright. Another problem is that SDL on modern Linux reports incorrectly that r_gammamethod 1 works. Probably you'll need to stick to r_gammamethod 0.