WineD3D: use the color key in glAlphaFunc in case of index_in_alpha 5/5

[Roderick Colenbrander]

Hi,

In case of index_in_alpha we should use the colorkey itself in glAlphaFunc. At the moment we are overwriting the alpha component with 0 for pixels that should get masked away but that of course conflicts with index_in_alpha itself, so that's why we should correctly use the color key in glAlphaFunc.

Regards,
Roderick Colenbrander
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