+
+/* Proxy class methods to per-object methods */
+static void proxy_draw(GisObject *_cb, GisOpenGL *opengl)
+{
+ GisCallback *cb = GIS_CALLBACK(_cb);
+ if (cb->draw)
+ cb->draw(cb, opengl, cb->user_data);
+}
+
+/* GisCallback */
+G_DEFINE_TYPE(GisCallback, gis_callback, GIS_TYPE_OBJECT);
+static void gis_callback_init(GisCallback *cb)
+{
+}
+
+static void gis_callback_class_init(GisCallbackClass *klass)
+{
+ GisObjectClass *object_class = GIS_OBJECT_CLASS(klass);
+ object_class->draw = proxy_draw;
+}