| /* |
| * 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.math.FastMath; |
| 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 LwjglSmoothingTimer extends Timer { |
| private static final Logger logger = Logger.getLogger(LwjglSmoothingTimer.class |
| .getName()); |
| |
| private long lastFrameDiff; |
| |
| //frame rate parameters. |
| private long oldTime; |
| |
| private float lastTPF, lastFPS; |
| |
| public static int TIMER_SMOOTHNESS = 32; |
| |
| private long[] tpf; |
| |
| private int smoothIndex; |
| |
| private final static long LWJGL_TIMER_RES = Sys.getTimerResolution(); |
| private final static float INV_LWJGL_TIMER_RES = ( 1f / LWJGL_TIMER_RES ); |
| private static float invTimerRezSmooth; |
| |
| public final static long LWJGL_TIME_TO_NANOS = (1000000000 / LWJGL_TIMER_RES); |
| |
| private long startTime; |
| |
| private boolean allSmooth = false; |
| |
| /** |
| * Constructor builds a <code>Timer</code> object. All values will be |
| * initialized to it's default values. |
| */ |
| public LwjglSmoothingTimer() { |
| reset(); |
| |
| //print timer resolution info |
| logger.log(Level.INFO, "Timer resolution: {0} ticks per second", LWJGL_TIMER_RES); |
| } |
| |
| public void reset() { |
| lastFrameDiff = 0; |
| lastFPS = 0; |
| lastTPF = 0; |
| |
| // init to -1 to indicate this is a new timer. |
| oldTime = -1; |
| //reset time |
| startTime = Sys.getTime(); |
| |
| tpf = new long[TIMER_SMOOTHNESS]; |
| smoothIndex = TIMER_SMOOTHNESS - 1; |
| invTimerRezSmooth = ( 1f / (LWJGL_TIMER_RES * TIMER_SMOOTHNESS)); |
| |
| // set tpf... -1 values will not be used for calculating the average in update() |
| for ( int i = tpf.length; --i >= 0; ) { |
| tpf[i] = -1; |
| } |
| } |
| |
| /** |
| * @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 newTime = Sys.getTime(); |
| long oldTime = this.oldTime; |
| this.oldTime = newTime; |
| if ( oldTime == -1 ) { |
| // For the first frame use 60 fps. This value will not be counted in further averages. |
| // This is done so initialization code between creating the timer and the first |
| // frame is not counted as a single frame on it's own. |
| lastTPF = 1 / 60f; |
| lastFPS = 1f / lastTPF; |
| return; |
| } |
| |
| long frameDiff = newTime - oldTime; |
| long lastFrameDiff = this.lastFrameDiff; |
| if ( lastFrameDiff > 0 && frameDiff > lastFrameDiff *100 ) { |
| frameDiff = lastFrameDiff *100; |
| } |
| this.lastFrameDiff = frameDiff; |
| tpf[smoothIndex] = frameDiff; |
| smoothIndex--; |
| if ( smoothIndex < 0 ) { |
| smoothIndex = tpf.length - 1; |
| } |
| |
| lastTPF = 0.0f; |
| if (!allSmooth) { |
| int smoothCount = 0; |
| for ( int i = tpf.length; --i >= 0; ) { |
| if ( tpf[i] != -1 ) { |
| lastTPF += tpf[i]; |
| smoothCount++; |
| } |
| } |
| if (smoothCount == tpf.length) |
| allSmooth = true; |
| lastTPF *= ( INV_LWJGL_TIMER_RES / smoothCount ); |
| } else { |
| for ( int i = tpf.length; --i >= 0; ) { |
| if ( tpf[i] != -1 ) { |
| lastTPF += tpf[i]; |
| } |
| } |
| lastTPF *= invTimerRezSmooth; |
| } |
| if ( lastTPF < FastMath.FLT_EPSILON ) { |
| lastTPF = FastMath.FLT_EPSILON; |
| } |
| |
| lastFPS = 1f / lastTPF; |
| } |
| |
| /** |
| * <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; |
| } |
| } |