[Bug 48613] Zwift: ZwiftApp.exe startup crash on intel graphics hardware

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48613

Danilo Lessa Bernardineli <danilo.lessa at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |danilo.lessa at gmail.com

--- Comment #8 from Danilo Lessa Bernardineli <danilo.lessa at gmail.com> ---
(In reply to wentam42 from comment #3)
> Spent a lot of time with a disassembler and debugger, found the problem, and
> found a workaround.
> 
> Ignore my comments about glDrawElements. That's all good.
> 
> Zwift calls wglGetProcAddress("glActiveTextureARB") and gets NULL even
> though the GL_ARB_multitexture extension should be available according to
> glxinfo. 
> 
> WINEDEBUG="+wgl" also gives "926:0138:warn:wgl:wglGetProcAddress Extension
> GL_ARB_multitexture required for glActiveTextureARB not supported".
> 
> Later on, Zwift tries to call the NULL pointer and the game crashes.
> 
> I don't know why wine isn't giving it a pointer.
> 
> However,setting the MESA_GL_VERSION_OVERRIDE environment variable to "3.1"
> allows the game to grab a pointer and the game to run.
> 
> So, the workaround:
> * wineserver -k - to make sure we fully reset
> * export MESA_GL_VERSION_OVERRIDE=3.1
> 
> Run the export command in any terminal windows that you will be running wine
> commands in.

I had to use an different MESA_GL version on my Ubuntu 19.10 / Intel(R) HD
Graphics 5300 to work. The following export makes Zwift run normally on my PC:

* export MESA_GL_VERSION_OVERRIDE=4.4COMPACT

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