http://bugs.winehq.org/show_bug.cgi?id=7284
--- Comment #35 from Tobias Jakobi liquid.acid@gmx.net 2009-03-30 07:11:29 --- I don't think clamping makes sense for the rcp instr. According to the D3D8 docs the vertexshader knows the concept of INFTY.
IMHO MUL is the problem. Or another possibility: The conversion from a 4-float vec to a RGBA value (oD0).
In the case that oD0 contains NaN, what RGBA does this map to? Maybe there lies the problem..