gtk:gl-area-use-es (object)

object -- a gtk:gl-area widget
setting -- a boolean whether the widget should create an OpenGL ES context

The accessor for the use-es slot of the gtk:gl-area class gets or sets whether the area should create an OpenGL or an OpenGL ES context. You should check the capabilities of the gdk:gl-context instance before drawing with either API. This function is deprecated since 4.12. Use the gtk:gl-area-api function.