I want you to make a Toon/Cell Shader with the following specifications:

- One that alters what is rendered
- The target would be Mobile Devices, so Android and iOS
- The only requirement is a limit of, at most, 3 colors
- Color values should suffice, it's a bland (PS1-era) shader
- Yes, Godot 4+
- I have plenty of experience in both, just not in Godot, specifically

is that enough information?
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