> Nothing works out they have deprecated OpenGL from Xcode in macOS version 10.14 and later ,instead of > OpenGL they are using metal framework in new macOS versions that's the reason you don't see any .glsl > extensions when you want to create a new file in your project I am also facing same issue with Mac OS and > tried installing virtual machine but that also didn't worked.
have you tried running
> make example1
(for MAC_VERSION Chapter2 code)? What does your terminal output?
Or are you having trouble creating a .glsl file? if so, try
> touch filename.glsl
> open filename.glsl