/*
- * Sixth 3D engine. Copyright ©2012-2019, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 3 of the GNU Lesser General Public License
- * or later as published by the Free Software Foundation.
- *
+ * Sixth 3D engine. Author: Svjatoslav Agejenko.
+ * This project is released under Creative Commons Zero (CC0) license.
*/
-
package eu.svjatoslav.sixth.e3d.gui;
public interface ViewRenderListener {
/**
- * Notifies that it is about time to render next frame and
+ * Notifies that it is about time (to keep constant framerate) to render next frame and
* allows listener to do any related processing that it needs to.
* <p>
* Each {@link ViewRenderListener} will be notified exactly once before every frame is rendered.
* <p>
* {@link ViewRenderListener} can determine if frame repaint is actually
* needed from its perspective. Frame will be rendered only if at least one listener says yes.
+ * This mechanism allows to save computing power and energy by skipping frame rendering when possible.
*
* @return <code>true</code> if underlying view shall be re-rendered. If at least one of the view update listeners
* returns <code>true</code>, view is re-rendered.