Emacs GL shader demo

Source: https://github.com/minad/emacs-shader-demo
Canvas patch:
https://github.com/minad/emacs-canvas-patch
Bug tracker:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=80281

Emacs doom scaling

The canvas has an original size of 320x200 and is scaled up by Cairo or XRENDER. Works better than expected.