code: func (v *GLArea) GetContext() (*gdk.GLContext, error) {
  	c := C.gtk_gl_area_get_context(v.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	obj := &glib.Object{glib.ToGObject(unsafe.Pointer(c))}
  	return &(gdk.GLContext{obj}), nil
  }
docs: // GetContext is a wrapper around gtk_gl_area_get_context().