Get the maximum supported Metal texture size for the current device on iOS or macOS.

max_size.swift

import SceneKit
import CoreGraphics

static func getMaxImageWidth() -> Int {
   let device = MTLCreateSystemDefaultDevice()!
   
   // According to the Metal Feature Set Tables there are only two supported maximum resolutions
   // 16384px for macs and the latest iOS devices
   // 8192px for the older iOS devices
   // Older Apple devices used to be limited to 4,096, 2,048 or even 1,024, but are no longer supported
   // https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf
   
   if device.supportsFamily(MTLGPUFamily.macCatalyst1) ||
      device.supportsFamily(MTLGPUFamily.mac1) ||
      device.supportsFamily(MTLGPUFamily.apple3) {
      return 16384
   }
   
   return 8192
}