[Bug 60300] New: Unity 6: crashes on startup before a window appears (D3D11 CreateFence)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60300

            Bug ID: 60300
           Summary: Unity 6: crashes on startup before a window appears
                    (D3D11 CreateFence)
           Product: Wine
           Version: 7.7
          Hardware: x86-64
                OS: MacOS
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: d3d
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---

Created attachment 82047
  --> http://bugs.winehq.org/attachment.cgi?id=82047
Unity Player.log from a pre-shim crash; key line: `GpuFence::Create(): Failed
to create ID3D11Fence, error 0x80004001`

Unity 6 D3D11 titles exit immediately on startup under Wine — no game
window. The process dies during D3D11 device setup.

Without any workaround, wine logs show CreateFence / ID3D11Device5 failing
or unimplemented. Unity 6 appears to require ID3D11Fence.

Verified with How to Fish (Steam AppID 4001890, Unity 6000.4.4f1).

Userspace workaround (native version.dll that stubs the fence; also bridges
WM_POINTER for a separate mouse issue). Not used for this repro:

https://github.com/programmeruser517/unity6-wine-macos

Environment:
- wine-7.7 (Whisky 2.3.5)
- macOS 26.6.2, MacBook Air (Apple M5; arm64 host / x86_64 Wine)
- Bottle: Windows 10

Terminal output attached.

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[Bug 60300] Unity 6: crashes on startup before a window appears (D3D11 CreateFence)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60300

--- Comment #1 from Ken Sharp <[e-mail]> ---
Wine 7.7 was relased in 2022.

Upgrade and try again.
https://gitlab.winehq.org/wine/wine/-/wikis/Download

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[Bug 60300] Unity 6: crashes on startup before a window appears (D3D11 CreateFence)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60300

--- Comment #2 from Nikolay Sivov <[e-mail]> ---
(In reply to Ken Sharp from comment #1)
> Wine 7.7 was relased in 2022.
>
> Upgrade and try again.
> https://gitlab.winehq.org/wine/wine/-/wikis/Download

Does current Wine have CreateFence() implemented?

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[Bug 60300] Unity 6: crashes on startup before a window appears (D3D11 CreateFence)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60300

Stian Low <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

--- Comment #3 from Stian Low <[e-mail]> ---
(In reply to Nikolay Sivov from comment #2)
> Does current Wine have CreateFence() implemented?

returning S_OK instead of E_NOTIMPL for d3d11_device_CreateFence() fixed Hollow
Knight Silksong recently:  
- https://bugs.winehq.org/show_bug.cgi?id=59414#c5

Maybe it's enough to work around other crashes.

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[Bug 60300] Unity 6: crashes on startup before a window appears (D3D11 CreateFence)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60300

--- Comment #4 from [e-mail] ---
(In reply to Ken Sharp from comment #1)
> Wine 7.7 was relased in 2022.
>
> Upgrade and try again.
> https://gitlab.winehq.org/wine/wine/-/wikis/Download

Agreed, Wine 7.7 is old, BUT that is what Whisky 2.3.5 ships (archived
GPTK-lineage runtime; no easy bump to current wine-devel inside Whisky).


(In reply to Nikolay Sivov from comment #2)
> (In reply to Ken Sharp from comment #1)
> > Wine 7.7 was relased in 2022.
> >
> > Upgrade and try again.
> > https://gitlab.winehq.org/wine/wine/-/wikis/Download
>
> Does current Wine have CreateFence() implemented?

Re: CreateFence — current Wine still does not implement it. In master,
d3d11_device_CreateFence / OpenSharedFence are stubs returning E_NOTIMPL (same
failure Unity logs as 0x80004001).


(In reply to Stian Low from comment #3)
> (In reply to Nikolay Sivov from comment #2)
> > Does current Wine have CreateFence() implemented?
>
> returning S_OK instead of E_NOTIMPL for d3d11_device_CreateFence() fixed
> Hollow Knight Silksong recently:  
> - https://bugs.winehq.org/show_bug.cgi?id=59414#c5
>
> Maybe it's enough to work around other crashes.

Returning success from CreateFence can unblock Unity 6, but it needs a fence
object plus Signal/Wait stubs (not only flipping E_NOTIMPL → S_OK). That is
what the userspace version.dll shim does for How to Fish. Silksong’s
VIDEO_SUPPORT issue (59414) is a related Unity D3D11 pain, but a separate path.

Happy to retest on stock wine-devel if that helps triage; the missing
CreateFence looks unchanged upstream either way.

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[Bug 60300] Unity 6: crashes on startup before a window appears (D3D11 CreateFence)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60300

Zeb Figura <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

--- Comment #5 from Zeb Figura <[e-mail]> ---
It's not implemented yet; there's no point retesting.

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