Loading metal kernel shaders for testing

Question

I'm trying to make a cocoa touch framework that will be performing some parallel computations on OSX/iOS and I'm having some issues with setting up the tests. Whenever I try to run :

library = device.newDefaultLibrary()!

I get hit by the error :

/Library/Caches/com.apple.xbs/Sources/Metal/Metal-55.2.8/Framework/MTLLibrary.mm:1016: failed assertion `filepath must not be nil.'

I was also trying to load shaders straight from the bundle without success.

How do I load up metal shaders properly so I can use them within a framework / tests?

Thanks!

Answer 1

You can load a Metal library from your framework with this code:

let library = try! sceneKitView.device!.newLibraryWithFile(NSBundle(forClass: TheNameOfThisClass.self).URLForResource("default", withExtension: "metallib")!.path!)

BUT I filed rdar://22618641 in September 2015 with a sample project that demonstrates that you can't load precompiled Metal libraries from frameworks — you get the same error you saw above when you try to use the library.

(Well, you CAN load the library, you just can't actually use it.)