[WINED3D 3/3] Fix fog in the case of vertex shaders

[H. Verbeet]

On 20/06/06, Ivan Gyurdiev <ivg231 at gmail.com> wrote:
> Is it really necessary to keep track of whether the shader uses fog or not?
> What happens if you disable this post-processing for a shader that doesn't
> write to the fog register?
Not "really necessary", but it does save a couple of GL state changes
if fog isn't used in the shader, and it's pretty easy to keep track
of.