GtkGLArea does not work on PinePhone

Created by: James Westman

I have a BraveHeart PinePhone running up-to-date Mobian.

Apps that use GtkGLArea do not seem to work. To reproduce:

• Install GTK3 examples (sudo apt install gtk-3-examples)
• Run gtk3-demo --run=glarea
• It says "Unable to create a GL context"

On my computer, the demo works and shows a shaded triangle.

This issue also affects gtkglsink in GStreamer.

Imported comments:

By Chris McGee on 2020-08-02T22:42:17.447Z

A workaround to this is to set an environment variable to force it into OpenGL ES (GLES) mode instead of full desktop OpenGL.

GDK_GL=gles gtk3-demo --run=glarea