[Bug 44315] Buffer maps cause CPU-GPU synchronization (Guild Wars 2, The Witcher 3)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=44315

--- Comment #41 from Kai Krakow <kai at kaishome.de> ---
It looks like pba requires inclusion of many (if not all) d3d staging patches -
which includes the deferred context patches. Apparently, these also depend on
the nvapi patches which is a no-go if you want to allow using dxvk: While it
works, it slows dxvk down because it has to deal with command streams in games
then (resulting from nvapi) and it cannot do so and complains loudly. There is
no support for this in Vulkan so it's unlikely to be supported in dxvk any time
soon.

But: If someone would work on removing the nvapi dependency from the deferred
context patches, I would work on importing the pba patches into my wine-proton
branch and into my wine-gaming branch. I think even without pba, the deferred
context patches could be a benefit.

What I don't like about the pba patches is that it requires to manually adjust
the heap space. Thanks to Fireat, at least this can be done with environment
variables. The next step would be to make it more automatic. I would opt-in to
work on such a patch if the above issues with nvapi and other dependencies are
fixed. But I'm far far away from understanding how pba integrates with the rest
of the wine d3d.

It is also difficult to follow the individual changes that are done with the
various wine branches that integrate pba because most of the time these are an
undefined collection of various staging and pba patches squashed together into
one single, huge patch committed to the repository. This shouldn't be done if
you want others to also work on your branches. It also prevents from reworking
the individual commits to integrate better with wine staging and refactor them
to be less intrusive. This really needs some love and work.

Currently, I rebased proton to wine-3.16 which was a lot of headache work due
to the vulkan fullscreen hacks not applying cleanly. But the result is very
rewarding: Shadow of Tomb Raider went from 19 fps or 31 fps in my system, and a
lot of other bugs related to focus-out events (icon-sized game when focusing
back in, game freezes) and gaming windows doing full-screen are fixed with
that. BTW: Thanks a lot to all the guys working on the official proton wine
branch and their individual own wine branches: You have done really great work,
I want to mention Zeb, Andrew and Aric especially here for their work on
threading improvements, input improvements (with improved force-feedback) and
audio improvements.

The branch is here if someone is interested (but it's not to be used as a
stand-alone wine prefix, it's for integration with proton because it includes
the steam client hacks):

https://github.com/kakra/wine/releases/tag/wine-proton_3.7-3.16-unofficial-1

BTW: I don't think there's a chance to get pba upstreamed into wine any times
soon without the inter-dependencies with wine-staging being resolved and making
the changes to the code more easy to follow. But this only means we should work
on it.

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