+ // GTK-specific methods
+ // -------------------
+
+ // this can be overridden to return a specific visual to be used for GTK+
+ // instead of the default one (it's used by wxGLApp)
+ //
+ // must return XVisualInfo pointer (it is not freed by caller)
+ virtual void *GetXVisualInfo() { return NULL; }
+
+
+ // implementation only from now on
+ // -------------------------------