Missing EGL support for Wayland

[VolkerEnderlein]

see this thread in coin3d-discuss

[yopito]

Hello,
It seems that this patch https://forum.freecadweb.org/viewtopic.php?t=33359#p354412 makes users happy while running FreeCAD under Wayland : see void-linux/void-packages#14626 for details.
Does coin dev have an opinion about this patch issue, and if this patch might help ?
Edit: reformulate

[VolkerEnderlein]

My knowledge about GLX and Wayland is very basic (only from a user perspective), so I do not know what issues may arise when applying this patch. I could make the removed check for GLX optional and enabled by default. Maybe some other devs can shed some light on this.

[epuzanov]

I've found why coin3d doesn't work correctly on the Wayland environment. The QGLWidget has a problem with a Wayland. I've re-implemented the QuarterWidget with QOpenGLWidget ( https://github.com/epuzanov/pivy/tree/QOpenGLWidget ).

[luzpaz]

This bug is going to get really noisy soon due FreeCAD wayland users preferring to operate in wayland env and not Xwindows

[WizzerWorks]

I updated an earlier branch to fix some issues I encountered while investigating EGL support on Wayland.

You can find this work at https://github.com/magic-lantern-studio/coin/tree/glue_egl. I did not create a merge request since it has not been tested for building on other platforms, other than Ubuntu.

Information on building this can be found at https://github.com/magic-lantern-studio/coin/wiki/OpenGL-ES-Investigation.