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Yes, that’s because it’s deprecated and that’s why you get all these warnings.

It's not just about warnings, Apple only supports OpenGL 4.1 which was released in 2011.

OpenGL 4 is not the “really old stuff”

Between 4.1 and 4.6, it changed a lot.

Apple never supported extensions for AZDO, for example.

It's missing features that D3D11 had in 2009.

Compute shaders in particular are a huge feature that GL4.1 doesn't have.