[Bug 9378] Combat Mission Shock Force DEMO: ' Could not initialize OpenGL graphics.'

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=9378

winetest at luukku.com changed:

           What    |Removed                     |Added
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                 CC|                            |winetest at luukku.com

--- Comment #18 from winetest at luukku.com ---
(In reply to Alexander Puzankov from comment #17)
> Problem is in pixel formats returned by DescribePixelFormat, specifically in
> the cAlphaShift field. Combat Mission engine enumerates these until
> cAlphaShift=24 is found (amongst other checks), but Wine always sets 0
> there. This patch seems to fix the issue:
> 
> --- a/dlls/winex11.drv/opengl.c
> +++ b/dlls/winex11.drv/opengl.c
> @@ -1725,7 +1725,7 @@ static int glxdrv_wglDescribePixelFormat
>      ppfd->cGreenBits = gb;
>      ppfd->cGreenShift = bb + ab;
>      ppfd->cAlphaBits = ab;
> -    ppfd->cAlphaShift = 0;
> +    ppfd->cAlphaShift = 24;
>    } else {
>      ppfd->cRedBits = 0;
>      ppfd->cRedShift = 0;
> 
> But I'm not entirely sure this doesn't break something else (in other apps),
> or is otherwise the correct way.

Somehow related bug 38763.

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