[Mesa-dev] Please bring back __GL_FSAA_MODE

[Tom Butler]

Hello,

I realise this was removed for a reason ( 
https://lists.freedesktop.org/archives/mesa-dev/2014-September/067864.html 
) but there are cases where it is useful. In older games that do not 
support native FSAA being able to force it in the driver is the only way 
to enable it.


A quick google search for AMD linux force msaa shows that I'm not the 
only one who would like to see this feature return:

https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/open-source-amd-linux/1024166-radeon-eqaa-anti-aliasing-support-merged-to-mesa-18-2?p=1024185#post1024185

https://bbs.archlinux.org/viewtopic.php?id=225425

https://www.reddit.com/r/linux_gaming/comments/671yzm/forcing_antialiasing_with_mesa_radeon_driver/

https://github.com/dscharrer/void/blob/master/hacks/forcemsaa.c

I understand it does cause issues in some cases but there are times when 
it is useful. Could it be reintroduced with a more relevant name that 
implies it shouldn't be used? E.g. GALLIUM_LEGACY_MSAA or 
GALLIUM_FORCE_MSAA_EXPERIMENTAL. That way it would lower users 
expectations while still making the option available to try.


Kind Regards,

Tom Butler