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1. metal_compute.swift metal_compute.swift

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   ///

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   /// This is a very simple command line application to work out how

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   /// to just run a compute program on the Metal GPU. It's not safe,

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   /// and will crash without warning if anything goes wrong, but I

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   /// was just trying to get the bare minimum thing working.

2. metal_image.swift metal_image.swift

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   ///

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   /// This is a 'single' function way to get a UIImage from a Metal shader

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   /// You still need to set up an MTLibrary in your app, but you should be

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   /// able to fairly readily drop this into a standard XCode app and as long

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   /// as you have the vertex and fragment shaders compiled into the library

3. simple return for a postcode test simple return for a postcode test

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   return "some string";