Setting up compute pipeline state in Metal.

DataConverter.swift

init()
{
  guard let device = MTLCreateSystemDefaultDevice() else { fatalError("Metal device is not available.") }
  self.device = device
          
  guard let commandQueue = device.makeCommandQueue() else { fatalError("Failed creating Metal command queue.") }
  self.commandQueue = commandQueue
        
  guard let library = device.makeDefaultLibrary() else { fatalError("Failed creating Metal library.") }
  guard let function = library.makeFunction(name: "processData") else { fatalError("Failed creating Metal function.") }
        
  do
  {
    computePipelineState = try device.makeComputePipelineState(function: function)
  }
  catch
  {
    fatalError("Failed preparing compute pipeline.")
  }
}