Thanks for spreading the word.
BTW, you can get the accompanying tutorial series for free
here. I use Visual Studio in the tutorials, but the code itself is cross-platform.
AFAIK, the code isn't usable on AmigaOS just yet, but that should be fixed at some point. Our SDL2 port has beta OpenGL ES 2+ support. I think we're just missing some GLES3 headers.
Hans