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OpenGL is just an API, the underlying features are provided by the graphic driver. You can't ship with your own OpenGL, that would mean shipping with your own amd/nvidia/intel driver (and the associated kernel module, etc).

A reasonable alternative would be to implement OpenGL on top of Metal for compatibility but this is a lot of work.

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What is gonna happen to games and apps which were using OpenGL since today then? They will stop working in the new macOS version?

edit, ups just read it: Apps built using OpenGL and OpenCL will continue to run in macOS 10.14, but these legacy technologies are deprecated in macOS 10.14. Games and graphics-intensive apps that use OpenGL should now adopt Metal. Similarly, apps that use OpenCL for computational tasks should now adopt Metal and Metal Performance Shaders. [0]

[0]https://developer.apple.com/macos/whats-new/

There's at least one implementation that I'm aware of in MoltenGL (https://moltengl.com/moltengl/), though that's only ES.

There is also MoltenVK https://github.com/KhronosGroup/MoltenVK for Vulkan on metal...

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