I have read that the GtkGLArea context sets to the modern OpenGL Core Profile mode by default. I’m trying to build a Gtk application with the obsolete fixed function pipeline OpenGL features in Compatibility mode. Is there any way to set the OpenGL profile to compatibility mode with a GtkGLArea?
No, there is no way to force a legacy profile. Legacy profiles are only used if the underlying GL driver does not support core profiles.
I strongly recommend porting the legacy code to “modern” GL before porting it to GTK3 (or GTK4).
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