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I think it's absolutely fair to count games that are able to run in Linux with Proton via DXVK + Vulcan. Since it's well established and relatively popular thanks to Valve's efforts with the Steam Deck and Proton.

Given those efforts, if Apple/Mac had support for Vulkan, Valve would probably make it all just as available on Mac as they do on Linux for Proton.

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Even with Vulkan support on macOS it would be harder for Valve to make many games accessible as they do on Linux – unlike Linux, macOS does not support running 32-bit binaries anymore.

You'd be correct a few years ago, but not anymore. WOW64 mode is pretty good nowadays.

Well - they might. I don't think Valve would hate being the gaming gateway for Mac as well as for PC, but they have great Linux support because of the Steam Deck.

If I'm not mistaken, supporting MacOS with Proton was the implicit plan before Apple disabled 32-bit support in Catalina. Several people seem to have gotten early builds to compile on Mac with usable performance: https://github.com/ValveSoftware/Proton/issues/1344

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