http://bugs.winehq.org/show_bug.cgi?id=7284
--- Comment #38 from Tobias Jakobi liquid.acid@gmx.net 2009-03-30 19:00:35 --- @Jan: What shading backend did you use for testing this with wine? GLSL or ARB?
This looks definitely interesting. The linux ATI driver seems to implement the NaN behaviour from native D3D.
Well, I think it's pretty much random how this could turn out, since it's nowhere defined how NaN is mapped....