@godotengine ok answering my own question, looks like reverse z is possible on GLES3 but because of [-1,1] z range there isn’t much depth precision to be gained.
Still I think this is better than having no reverse z on OpenGL ES (eg. Unity).
@bitinn@godotengine yeah on OpenGL ES you can reverse Z, but it does not bring any benefits (besides consistency). Back when Unity implemented it (some 8 years ago?), it had a downside that some mobile GPUs were slightly less efficient with reversed depth test (something something Z early rejection), that's one of the reasons why OpenGL ES left with non-reversed Z in Unity. These days probably not an issue anymore.
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