iOS code to identify metal support in runtime?

Question

Usually, I use the below code to identify the iOS version of the device.

if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0)

In

Answer 1

On iOS, you should just check MTLCreateSystemDefaultDevice(). If it returns a valid device, you’re good to go. On macOS, you need to be careful; use [MTLCopyAllDevices() count] to determine if you have any supported metal devices available.

You should avoid using MTLCreateSystemDefaultDevice() on macOS because that can force a mux switch to the discrete GPU (eg: if you're dealing with a laptop with automatic graphics switching between a discrete and integrated graphics).