Shaders Not Working on Linux

[magoolachub]

All the advanced graphical effects do not seem to work, shields don't shimmer, fireballs don't use the fire sprite, etc. I've had a look through the log but it only seems to complain about being unable to load a single shader from cults. I'm running arch linux with mesa 18.2.6 on a RX 580.

Link to my te4_log.txt: https://pastebin.com/rgdEcWyf