Any chance to convert to Metal? OpenGL deprecated in iOS 12

[brendand]

Since iOS 12 has deprecated OpenGL / GLKView, it would be great if this project could be converted to Metal. I don't know how much longer OpenGL will still work in iOS. Current version is iOS 13.3 and it still works. But still, one day it will fail.

[danielgindi]

OpenGL is a standard in all platforms, it's weird that they even deprecated it...