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Pretty sure it was supposed to come in a dot upgrade of Xcode 13 (and the very basic create part was in a beta if I remember correctly). As there's also no sign of it in Xcode 14 betas it would seem like it has most likely been abandoned, which is kind of sad
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Don't know if it's any help in your case but notice that you can insert a filter at the linear stage via the kCIInputLinearSpaceFilter option
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Let me add that we have run into exactly the same situation with a number of compute shaders that use read/write textures where it seems to work just fine on hardware where in fact it is not officially supported (both Mac and iOS devices). Can only guess that it will depend on the exact code whether it actually works or not
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In case you are not already aware of this - Notarization requirements were temporarily loosened so that it would succeed in spite of warnings. This is no longer the case
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Yes - in todays time frame every Nvidia GPU built into a Mac can be considered old
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Rather than looking at the order of devices you can use the lowPower attribute to identify the integrated GPU. Apart from that I must say that except for the very old Nvidia GPUs I haven't really seen any Metal device specific issues when it comes to our compute code