[Bug 43246] King's Bounty: The Legend suffers from performance issues

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=43246

--- Comment #11 from Matteo Bruni <matteo.mystral at gmail.com> ---
(In reply to Matteo Bruni from comment #10)
> I'll probably have a look at the actual game soon.

Obviously that was wishful thinking on my part. I managed to have a look,
finally, and the result is... interesting.

I basically confirm comment 2: the game does a lot of buffer maps with DISCARD
and NOOVERWRITE with non-DYNAMIC buffers and expects them to work as if they
were DYNAMIC.

Problem is, they are not supposed to be fast with that kind of usage, as I
described in detail in
<https://www.winehq.org/pipermail/wine-devel/2018-November/135071.html>,
especially for Nvidia. So I brought back the test from that email to
investigate this even further on Windows.

Nothing new came up from that: non-DYNAMIC DEFAULT buffers simply ignore the
NOOVERWRITE map flag on Nvidia and are thus very slow in those cases. Then I
had the idea of renaming the test executable to kb.exe (which is the name of
the game's executable): sure enough, non-DYNAMIC buffers started to perform
exactly like DYNAMIC buffers...

I also tried to "break" the game by renaming the executable but that wasn't
enough. I suspect it's still recognized somehow.

Bottom line: the game is broken, either the driver or the d3d9 runtime have a
quirk for the game to workaround the breakage. Not sure what we should do, if
anything.

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