[Bug 57070] New: OpenGL performance regression in Wine 9.15

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57070

Bug ID: 57070
           Summary: OpenGL performance regression in Wine 9.15
           Product: Wine
           Version: 9.15
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

In Wine 9.15, I observe a serious performance regression, presumably in OpenGL
apps. DirectX stuff is fine.

Extended renderer info (GLX_MESA_query_renderer):
    Vendor: AMD (0x1002)
    Device: AMD Radeon RX 580 Series (radeonsi, polaris10, ACO, DRM 3.58,
6.11.0-rc3) (0x67df)
    Version: 24.1.5
    Accelerated: yes
    Video memory: 8192MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.6
    Max compat profile version: 4.6
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2

Can't say much more, nothing interesting in logs.
However, I have done a bisection.

849d7aa3c72df7fee0372a7fcc9e058a4b3795bf is the first bad commit
commit 849d7aa3c72df7fee0372a7fcc9e058a4b3795bf
Author: Rémi Bernon 
Date:   Mon Jul 1 11:03:57 2024 +0200

winex11: Rely on win32u previous surface reuse.

dlls/winex11.drv/bitblt.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

Unfortunately, I don't understand what's going on with this code.