wined3d: Take abs() of vertex z coordinate as FFP fog coordinate and remove oFog clamp for vertex shaders

[Stefan Dösinger]

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Am 2014-10-27 13:25, schrieb Stefan Dösinger:
>> Testing the oFog clamp behavior is a nice extra -- I wouldn't be
>>  unhappy if a version of the patch that leaves that out could be
>>  committed.
> I'll do some investigation regarding vertex fog + a fragment 
> processing setup that just replaces the color, but otherwise I
> agree.
The attached test combined with your test should show that fixed
function vertex fog indeed output a fog coordinate of abs(z) and does
not merge the fog color into the diffuse color prior to fragment
processing. (no d3d8 and ddraw versions yet)
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