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    This is a nice debugging yarn, but I don’t see what’s “impossible” here?

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      Impossible because it required unreleased knowledge to fix. Privileged arcana. If I were faced with those renders I’d be scratching me head and assuming I need to software-composite multiple frames to work around the issue.

      I like the sections about finding details from talks and seeing what Metal does whilst it’s being debugged.

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        Unfortunately, WWDC slides are the de facto documentation for many Apple APIs.