| /* |
| * Copyright (c) 2009-2010 jMonkeyEngine |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * * Neither the name of 'jMonkeyEngine' nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package com.jme3.system.lwjgl; |
| |
| import com.jme3.system.Timer; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import org.lwjgl.Sys; |
| |
| /** |
| * <code>Timer</code> handles the system's time related functionality. This |
| * allows the calculation of the framerate. To keep the framerate calculation |
| * accurate, a call to update each frame is required. <code>Timer</code> is a |
| * singleton object and must be created via the <code>getTimer</code> method. |
| * |
| * @author Mark Powell |
| * @version $Id: LWJGLTimer.java,v 1.21 2007/09/22 16:46:35 irrisor Exp $ |
| */ |
| public class LwjglTimer extends Timer { |
| private static final Logger logger = Logger.getLogger(LwjglTimer.class |
| .getName()); |
| |
| //frame rate parameters. |
| private long oldTime; |
| private long startTime; |
| |
| private float lastTPF, lastFPS; |
| |
| private final static long LWJGL_TIMER_RES = Sys.getTimerResolution(); |
| private final static float INV_LWJGL_TIMER_RES = ( 1f / LWJGL_TIMER_RES ); |
| |
| public final static long LWJGL_TIME_TO_NANOS = (1000000000 / LWJGL_TIMER_RES); |
| |
| /** |
| * Constructor builds a <code>Timer</code> object. All values will be |
| * initialized to it's default values. |
| */ |
| public LwjglTimer() { |
| reset(); |
| logger.log(Level.INFO, "Timer resolution: {0} ticks per second", LWJGL_TIMER_RES); |
| } |
| |
| public void reset() { |
| startTime = Sys.getTime(); |
| oldTime = getTime(); |
| } |
| |
| @Override |
| public float getTimeInSeconds() { |
| return getTime() * INV_LWJGL_TIMER_RES; |
| } |
| |
| /** |
| * @see com.jme.util.Timer#getTime() |
| */ |
| public long getTime() { |
| return Sys.getTime() - startTime; |
| } |
| |
| /** |
| * @see com.jme.util.Timer#getResolution() |
| */ |
| public long getResolution() { |
| return LWJGL_TIMER_RES; |
| } |
| |
| /** |
| * <code>getFrameRate</code> returns the current frame rate since the last |
| * call to <code>update</code>. |
| * |
| * @return the current frame rate. |
| */ |
| public float getFrameRate() { |
| return lastFPS; |
| } |
| |
| public float getTimePerFrame() { |
| return lastTPF; |
| } |
| |
| /** |
| * <code>update</code> recalulates the frame rate based on the previous |
| * call to update. It is assumed that update is called each frame. |
| */ |
| public void update() { |
| long curTime = getTime(); |
| lastTPF = (curTime - oldTime) * (1.0f / LWJGL_TIMER_RES); |
| lastFPS = 1.0f / lastTPF; |
| oldTime = curTime; |
| } |
| |
| /** |
| * <code>toString</code> returns the string representation of this timer |
| * in the format: <br> |
| * <br> |
| * jme.utility.Timer@1db699b <br> |
| * Time: {LONG} <br> |
| * FPS: {LONG} <br> |
| * |
| * @return the string representation of this object. |
| */ |
| @Override |
| public String toString() { |
| String string = super.toString(); |
| string += "\nTime: " + oldTime; |
| string += "\nFPS: " + getFrameRate(); |
| return string; |
| } |
| } |