macos: various GL context cleanups (!2929) · Merge requests · GNOME / gtk · GitLab

Christian Hergert requested to merge wip/chergert/gdk-macos-for-master into master Dec 07, 2020

Set opaque GL context when inside an opaque window
Only request 24-bit color (alpha channel is separate)
Use CGLEnable() and CGLSetParameter() instead of NSOpenGLContext when possible