Creates a new GdkGLContext with the appropriate GdkGLDrawable for this widget. The GL context must be freed when you're finished with it. See also gtk_widget_get_gl_context().
Returns the GdkGLConfig referred by the widget.
Returns the GdkGLContext with the appropriate GdkGLDrawable for this widget. Unlike the GL context returned by gtk_widget_create_gl_context(), this context is owned by the widget. GdkGLContext is needed for the function gdk_gl_drawable_begin, or for sharing display lists (see gtk_widget_set_gl_capability()).
Returns the GdkGLWindow owned by the widget.
Returns whether the widget is OpenGL-capable.
Set the OpenGL-capability to the widget. This function prepares the widget for its use with OpenGL.