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/*
* 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;
/**
* <code>NanoTimer</code> is a System.nanoTime implementation of <code>Timer</code>.
* This is primarily useful for headless applications running on a server.
*
* @author Matthew D. Hicks
*/
public class NanoTimer extends Timer {
private static final long TIMER_RESOLUTION = 1000000000L;
private static final float INVERSE_TIMER_RESOLUTION = 1f/1000000000L;
private long startTime;
private long previousTime;
private float tpf;
private float fps;
public NanoTimer() {
startTime = System.nanoTime();
}
/**
* Returns the time in seconds. The timer starts
* at 0.0 seconds.
*
* @return the current time in seconds
*/
@Override
public float getTimeInSeconds() {
return getTime() * INVERSE_TIMER_RESOLUTION;
}
public long getTime() {
return System.nanoTime() - startTime;
}
public long getResolution() {
return TIMER_RESOLUTION;
}
public float getFrameRate() {
return fps;
}
public float getTimePerFrame() {
return tpf;
}
public void update() {
tpf = (getTime() - previousTime) * (1.0f / TIMER_RESOLUTION);
fps = 1.0f / tpf;
previousTime = getTime();
}
public void reset() {
startTime = System.nanoTime();
previousTime = getTime();
}
}
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