Quake-style fullbright colors

Godot Version

4.2.1

Question

Would it be possible to create a shader that mimics the fullbright colors used in the original quake, i.e. colors in a palette that are not affected by shadows?

More in the realm of lighting possibly. Have a look at: 3D lights and shadows — Godot Engine (stable) documentation in English

So after a little research, I think the effect I’m looking for is to have colors that are “unshaded”.