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I belive it is the xBRZ filter.

Thanks for the reply! I have figured this out, I even made a template project for Godot https://github.com/eboatwright/xBRZ-Godot

P.S. Just checking out your profile, 12 years old?! These games are better than mine lol Keep up the great work!

Thanks!

For anyone stumbling on this thread like me, here is a shader working for Godot 4 doing the same thing.

https://godotshaders.com/shader/pixelart-upscaler-filter-2/