Description

Porting the glspectrum plugin to use GtkGLArea (available since GTK 3.16) would be beneficial for two reasons:

• No need of different code for X11 and Windows as GTK would take care of it internally
• Wayland support, the current code for Linux requires X11/XWayland explicitly

As my OpenGL knowledge is not good enough to port this plugin myself, I file this here as enhancement. Patches are welcome. 🙂

Additional information

1. https://docs.gtk.org/gtk3/class.GLArea.html
2. https://www.bassi.io/articles/2015/02/17/using-opengl-with-gtk/
3. https://github.com/ebassi/glarea-example
4. https://stackoverflow.com/questions/69201843/how-do-you-do-3d-rendering-in-gtk-using-opengl

CC: @CBke, @carlo-bramini as you have been contributors for this plugin