[Bug 41930] Civilization III Complete shows black terrain (Wine compiled with OSMesa support)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=41930

--- Comment #42 from Bryan Varner <bryan at varnernet.com> ---
Patches from Comment 25 and Comment 28 makes the game playable but _do_not_ fix
the underlying issue.

The patches effectively fail to allocate a pbuffer context, which the game
authors were intelligent enough to code around and degrade graphics overlays
accordingly.

The underlying issue is an offscreen WGL pbuffer being drawn opaque (copy over
destination), instead of doing an precomputed alpha merge into the destination
from the pbuffer source.

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