I would like to notify everyone that I have tried the latest mesa available
from git (both mesa and lib32-mesa from git, via the AUR on Arch Linux) and
there seems to be no artificating! I do not know what you guys did but it
seemed to have worked.

Thank you so much, I appreciate it!

I downloaded mesa-demo from official ach repo, I am not aware if that is okay
but when I run glxinfo | grep "OpenGL version" it shows

OpenGL version string: 3.0 Mesa 11.0.0-devel (git-d6d7515)