An experimental migration of GLCameraRipple to Metal.
Xcode 10.2.1, iOS SDK 12.2
(You cannot build Metal apps targeting simulators.)
iOS 9.0 or later, Metal capable devide
See the license terms included in each files of the original project.
https://developer.apple.com/library/archive/samplecode/GLCameraRipple/Introduction/Intro.html
Or the copied terms included in each files of the tranlated project.