| /* |
| * 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(); |
| } |
| } |