metalfiltersample.swift

  override func viewDidLoad() {
      super.viewDidLoad()

      self.beginImage = CIImage(image: UIImage(named: "milk")!)
      self.context = CIContext(options: nil)

      let url = Bundle.main.url(forResource: "default", withExtension: "metallib")!
      let data = try! Data(contentsOf: url)
      let kernel = try! CIColorKernel(functionName: "myColor", fromMetalLibraryData: data)
      let output = kernel.apply(extent: beginImage.extent, arguments: [beginImage as Any])!

      if let cgimg = context.createCGImage(output, from: output.extent) {
          let processedImage = UIImage(cgImage: cgimg)
          self.imgView.image = processedImage
      }
  }