I had a bit of fun with looking things up, given "glsl quake palette" is an engine trend around here

Unfortunately it's a vec3 array and not an actual LUT texture right now and to get this to work I had to reduce color values to 18-bit and the performance is pretty slow (25fps in 1280x720).
It's not software rendered, but should be a rough draft of what it could probably look like. I should probably backport the old quake particle system effects for good measure. There's even mono lightmaps and the gun bobbing resembles Quake as well.