It looks like [[stitchable]] Metal Core Image kernels fail to get added in the default metal library. Here is my code:
class FilterTwo: CIFilter {
var inputImage: CIImage?
var inputParam: Float = 0.0
static var kernel: CIKernel = { () -> CIKernel in
let url = Bundle.main.url(forResource: "default",
withExtension: "metallib")!
let data = try! Data(contentsOf: url)
let kernelNames = CIKernel.kernelNames(fromMetalLibraryData: data)
NSLog("Kernels \(kernelNames)")
return try! CIKernel(functionName: "secondFilter", fromMetalLibraryData: data) //<-- This fails!
}()
override var outputImage : CIImage? {
guard let inputImage = inputImage else {
return nil
}
return FilterTwo.kernel.apply(extent: inputImage.extent, roiCallback: { (index, rect) in
return rect }, arguments: [inputImage])
}
}
Here is the Metal code:
using namespace metal;
[[ stitchable ]] half4 secondFilter (coreimage::sampler inputImage, coreimage::destination dest)
{
float2 srcCoord = inputImage.coord();
half4 color = half4(inputImage.sample(srcCoord));
return color;
}
And here is the usage:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let filter = FilterTwo()
filter.inputImage = CIImage(color: CIColor.red)
let outputImage = filter.outputImage!
NSLog("Output \(outputImage)")
}
}
And the output:
StitchableKernelsTesting/FilterTwo.swift:15: Fatal error: 'try!' expression unexpectedly raised an error: Error Domain=CIKernel Code=1 "(null)" UserInfo={CINonLocalizedDescriptionKey=Function does not exist in library data. …•∆}
Kernels []
reflect Function 'secondFilter' does not exist.
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