Running Playground Chapters from MetalKit in MacOS

[pudepiedj]

Marius, I've very much enjoyed your MetalKit sequence and learned much from it, so thank you.

From the Chapter 8 code accompanying the blogs onwards where you use playgrounds rather than projects I find that the path search in Metal.swift using guard let path = never manages to find the Shaders.metal file inside Resources, so the code won't build. Replacing the whole line with an absolute path fixes it, but I am not sure whether this is my setup or something that has changed in Swift 5.3, XCode 12.0 or somewhere else both of which I am using.

All the fixes for this error on SO seem to relate to XCode projects rather than playgrounds, and I haven't found any suggestions about how to fix the problem directly in the playground files and avoid introducing an absolute path.

Thanks.

[Eric-Sunny-Fish]

The reason to add the .metal extension to the file is so that Xcode can recognize the file is a Metal file, and display the file with syntax highlighting. Nothing in the process of running the file requires the extension. An alternative way to mark this as a Metal file is to set the type to Metal Shader Source in the File Inspector.
Bundle.main.path(forResource:, ofType:) appears to be broken. It will not find a file of type "metal" it will find a file of type "meta" or "mmmmm" or no type. It appears to do something wrong with .metal files.
So a work around for this issue is to manually set the type of Shaders.metal to Metal Shader Source, remove the .metal extension, and change the type to nil in Bundle.main.path(forResource:, ofType:).

[songhuaixu]

In Xcode 14, device.makeDefaultLibrary() can function normally