159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta/* 259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * Copyright (c) 2009-2010 jMonkeyEngine 359b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * All rights reserved. 459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * 559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * Redistribution and use in source and binary forms, with or without 659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * modification, are permitted provided that the following conditions are 759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * met: 859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * 959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * * Redistributions of source code must retain the above copyright 1059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * notice, this list of conditions and the following disclaimer. 1159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * 1259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * * Redistributions in binary form must reproduce the above copyright 1359b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * notice, this list of conditions and the following disclaimer in the 1459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * documentation and/or other materials provided with the distribution. 1559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * 1659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * * Neither the name of 'jMonkeyEngine' nor the names of its contributors 1759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * may be used to endorse or promote products derived from this software 1859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * without specific prior written permission. 1959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * 2059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 2159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 2259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 2359b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 2459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 2559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 2659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 2759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 2859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 2959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 3059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta */ 3259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 3359b2e6871c65f58fdad78cd7229c292f6a177578Scott Bartapackage com.jme3.system; 3459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 3559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta/** 3659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * <code>NanoTimer</code> is a System.nanoTime implementation of <code>Timer</code>. 3759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * This is primarily useful for headless applications running on a server. 3859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * 3959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * @author Matthew D. Hicks 4059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta */ 4159b2e6871c65f58fdad78cd7229c292f6a177578Scott Bartapublic class NanoTimer extends Timer { 4259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 4359b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta private static final long TIMER_RESOLUTION = 1000000000L; 4459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta private static final float INVERSE_TIMER_RESOLUTION = 1f/1000000000L; 4559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 4659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta private long startTime; 4759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta private long previousTime; 4859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta private float tpf; 4959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta private float fps; 5059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 5159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta public NanoTimer() { 5259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta startTime = System.nanoTime(); 5359b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta } 5459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 5559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta /** 5659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * Returns the time in seconds. The timer starts 5759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * at 0.0 seconds. 5859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * 5959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta * @return the current time in seconds 6059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta */ 6159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta @Override 6259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta public float getTimeInSeconds() { 6359b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta return getTime() * INVERSE_TIMER_RESOLUTION; 6459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta } 6559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 6659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta public long getTime() { 6759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta return System.nanoTime() - startTime; 6859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta } 6959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 7059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta public long getResolution() { 7159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta return TIMER_RESOLUTION; 7259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta } 7359b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 7459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta public float getFrameRate() { 7559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta return fps; 7659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta } 7759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 7859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta public float getTimePerFrame() { 7959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta return tpf; 8059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta } 8159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 8259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta public void update() { 8359b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta tpf = (getTime() - previousTime) * (1.0f / TIMER_RESOLUTION); 8459b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta fps = 1.0f / tpf; 8559b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta previousTime = getTime(); 8659b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta } 8759b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta 8859b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta public void reset() { 8959b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta startTime = System.nanoTime(); 9059b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta previousTime = getTime(); 9159b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta } 9259b2e6871c65f58fdad78cd7229c292f6a177578Scott Barta} 93