Sets an error on the area which will be shown instead of the GL rendering. This is useful in the #GtkGLArea::create-context signal if GL context creation fails.
a new #GError, or %NULL to unset the error
3.16
See Implementation
Sets an error on the area which will be shown instead of the GL rendering. This is useful in the #GtkGLArea::create-context signal if GL context creation fails.