[2/2] wined3d: Take abs() of vertex z coordinate as FFP fog coordinate (try 5)

[Joachim Priesner]

Hi Matteo,

> Where are you setting the value of c0 in the d3d8 test?

In the vertex declaration (line 797), which is apparently the only way to do it in d3d8.

I could move the vertex declaration directly before the shader code like in test_scalar_instructions, would that make it clear enough?

Best
Joachim