WineD3D: Fog fixes

[Jesse Allen]

On 6/9/06, Stefan Dösinger <stefan at codeweavers.com> wrote:
> This patch corrects a few issues with fog on transformed vertices, and
> non-pixel-non-vertex fog.
>
> If WINED3DRS_FOGENABLE is TRUE, but WINED3RS_FOGVERTEXMODE and
> WINED3DRS_FOGTABLEMODE are D3DFOG_NONE, then, according to the msdn, the
> alpha channel specular color vertex color contains a pre-calculated fog
> value. The same applied to transformed vertices if Vertexfog is enabled. This
> patch uses glFogCoord to pass it to GL if GL_EXT_fog_coord is supported, and
> disables GL fog if it isn't to minimize rendering issues.
>
> This patch makes Swat3 and Battlezone 2 happy, and the fog in Prince of Persia
> 3D looks more correct now. I hoped that patch might solve the disappearing
> objects problem in Half-Life 2, but unfortunately it doesn't, this seems not
> to be fog-related :-(
>
> ChangeLog:
> Stefan Dösinger(for CodeWeavers): Fog fixes
>
>


This patch doesn't work with the latest fglrx saying missing symbol
for glFogCoordf. Mesa is ok though.

Jesse