http://bugs.winehq.org/show_bug.cgi?id=27145
--- Comment #39 from Stefan Dösinger stefandoesinger@gmx.at 2011-09-20 09:44:21 CDT --- Can you add an additional debug statement to print scale_bias.f and const_bias.f?
But my main suspicion that the game uses floating point depth buffers didn't come true.