[Bug 37711] payday 2 broken lighting

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=37711

--- Comment #1 from Henri Verbeet <hverbeet at gmail.com> ---
(In reply to Axel D from comment #0)
> In particular for depth stencil formats, like D3DFMT_D24S8 used by the game,
> we have the depth on r, the stencil on g, and b=0 a=1
> 
> I don't remember what different combinations I tried for this format, but
> basically when different from that, I got broken lights exactly like wine.
> 
Depth on R and stencil on G sounds suspicious, since D3DFMT_D24S8 is supposed
to be a "shadow format" and supposed to return the result of the depth
comparison (provided the format is supported at all for texturing) on R, while
plenty of hardware that supported D3DFMT_D24S8 for texturing couldn't read
stencil values at all.

Returning 1.0f for A on the other hand is likely correct, since many other
formats behave like that in D3D, and Wine does indeed not handle those quite
correctly.

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