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"MoltenVK is a runtime library that maps Vulkan to Apple's Metal graphics framework on iOS and macOS."

But molten is for Vulkan (ie: not OpenGL) - and not 100% of Vulkan, AFAIK.

Both exist: MoltenGL is for OpenGL ES https://moltengl.com/moltengl/

OpenGL ES is not OpenGL though.

It's a subset mostly for mobile.