https://bugs.freedesktop.org/show_bug.cgi?id=100393
--- Comment #4 from Ilia Mirkin imirkin@alum.mit.edu --- (In reply to Giovanni ongaro from comment #3)
sorry but in fact this error is displayed Mesa: User error: GL_INVALID_ENUM in glEnable(GL_PRIMITIVE_RESTART)
and then sound plays
The issue is "cemu was developed against a specific GL implementation, and doesn't work with other perfectly conformant GL implementations".
In this case, you're getting a GL 3.0 compat context. It tries to enable GL_PRIMITIVE_RESTART, which was not available in GL 3.0. With NV_primitive_restart, which is most likely exposed, one needs to use GL_PRIMITIVE_RESTART_NV, which conveniently is a different value.
As I mentioned, you can try the COMPAT tail to the version override so you get a compat context, but lots of stuff won't work - there are good reasons why mesa doesn't expose high-versioned compat contexts.