[Nouveau] [Bug 99995] Dirt showdown very low fps (~3fps) after update mesa

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99995

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
One difference is that 17.0 has GL 4.3 enabled for Maxwell (e.g. GTX 750),
which perhaps causes the game to choose a different path, thus not really be
directly comparable. Try it with

MESA_GL_VERSION_OVERRIDE=4.1

which will get it back to the same GL version that was available with 13.0. Or
try it with

MESA_EXTENSION_OVERRIDE='-GL_ARB_shader_image_load_store
-GL_ARB_compute_shader'

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