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+/*
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+ * Copyright (c) 2009-2010 jMonkeyEngine
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are
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+ * met:
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+ *
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ *
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+ * * Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ *
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+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
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+ * may be used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+package com.jme3.system.lwjgl;
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+
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+import com.jme3.math.FastMath;
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+import com.jme3.system.Timer;
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+import java.util.logging.Level;
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+import java.util.logging.Logger;
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+import org.lwjgl.Sys;
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+
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+/**
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+ * <code>Timer</code> handles the system's time related functionality. This
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+ * allows the calculation of the framerate. To keep the framerate calculation
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+ * accurate, a call to update each frame is required. <code>Timer</code> is a
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+ * singleton object and must be created via the <code>getTimer</code> method.
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+ *
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+ * @author Mark Powell
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+ * @version $Id: LWJGLTimer.java,v 1.21 2007/09/22 16:46:35 irrisor Exp $
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+ */
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+public class LwjglSmoothingTimer extends Timer {
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+ private static final Logger logger = Logger.getLogger(LwjglSmoothingTimer.class
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+ .getName());
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+
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+ private long lastFrameDiff;
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+
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+ //frame rate parameters.
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+ private long oldTime;
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+
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+ private float lastTPF, lastFPS;
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+
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+ public static int TIMER_SMOOTHNESS = 32;
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+
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+ private long[] tpf;
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+
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+ private int smoothIndex;
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+
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+ private final static long LWJGL_TIMER_RES = Sys.getTimerResolution();
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+ private final static float INV_LWJGL_TIMER_RES = ( 1f / LWJGL_TIMER_RES );
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+ private static float invTimerRezSmooth;
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+
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+ public final static long LWJGL_TIME_TO_NANOS = (1000000000 / LWJGL_TIMER_RES);
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+
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+ private long startTime;
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+
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+ private boolean allSmooth = false;
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+
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+ /**
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+ * Constructor builds a <code>Timer</code> object. All values will be
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+ * initialized to it's default values.
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+ */
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+ public LwjglSmoothingTimer() {
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+ reset();
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+
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+ //print timer resolution info
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+ logger.log(Level.INFO, "Timer resolution: {0} ticks per second", LWJGL_TIMER_RES);
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+ }
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+
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+ public void reset() {
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+ lastFrameDiff = 0;
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+ lastFPS = 0;
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+ lastTPF = 0;
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+
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+ // init to -1 to indicate this is a new timer.
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+ oldTime = -1;
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+ //reset time
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+ startTime = Sys.getTime();
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+
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+ tpf = new long[TIMER_SMOOTHNESS];
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+ smoothIndex = TIMER_SMOOTHNESS - 1;
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+ invTimerRezSmooth = ( 1f / (LWJGL_TIMER_RES * TIMER_SMOOTHNESS));
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+
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+ // set tpf... -1 values will not be used for calculating the average in update()
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+ for ( int i = tpf.length; --i >= 0; ) {
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+ tpf[i] = -1;
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+ }
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+ }
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+
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+ /**
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+ * @see com.jme.util.Timer#getTime()
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+ */
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+ public long getTime() {
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+ return Sys.getTime() - startTime;
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+ }
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+
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+ /**
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+ * @see com.jme.util.Timer#getResolution()
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+ */
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+ public long getResolution() {
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+ return LWJGL_TIMER_RES;
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+ }
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+
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+ /**
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+ * <code>getFrameRate</code> returns the current frame rate since the last
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+ * call to <code>update</code>.
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+ *
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+ * @return the current frame rate.
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+ */
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+ public float getFrameRate() {
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+ return lastFPS;
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+ }
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+
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+ public float getTimePerFrame() {
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+ return lastTPF;
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+ }
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+
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+ /**
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+ * <code>update</code> recalulates the frame rate based on the previous
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+ * call to update. It is assumed that update is called each frame.
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+ */
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+ public void update() {
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+ long newTime = Sys.getTime();
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+ long oldTime = this.oldTime;
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+ this.oldTime = newTime;
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+ if ( oldTime == -1 ) {
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+ // For the first frame use 60 fps. This value will not be counted in further averages.
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+ // This is done so initialization code between creating the timer and the first
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+ // frame is not counted as a single frame on it's own.
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+ lastTPF = 1 / 60f;
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+ lastFPS = 1f / lastTPF;
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+ return;
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+ }
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+
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+ long frameDiff = newTime - oldTime;
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+ long lastFrameDiff = this.lastFrameDiff;
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+ if ( lastFrameDiff > 0 && frameDiff > lastFrameDiff *100 ) {
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+ frameDiff = lastFrameDiff *100;
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+ }
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+ this.lastFrameDiff = frameDiff;
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+ tpf[smoothIndex] = frameDiff;
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+ smoothIndex--;
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+ if ( smoothIndex < 0 ) {
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+ smoothIndex = tpf.length - 1;
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+ }
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+
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+ lastTPF = 0.0f;
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+ if (!allSmooth) {
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+ int smoothCount = 0;
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+ for ( int i = tpf.length; --i >= 0; ) {
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+ if ( tpf[i] != -1 ) {
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+ lastTPF += tpf[i];
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+ smoothCount++;
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+ }
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+ }
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+ if (smoothCount == tpf.length)
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+ allSmooth = true;
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+ lastTPF *= ( INV_LWJGL_TIMER_RES / smoothCount );
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+ } else {
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+ for ( int i = tpf.length; --i >= 0; ) {
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+ if ( tpf[i] != -1 ) {
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+ lastTPF += tpf[i];
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+ }
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+ }
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+ lastTPF *= invTimerRezSmooth;
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+ }
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+ if ( lastTPF < FastMath.FLT_EPSILON ) {
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+ lastTPF = FastMath.FLT_EPSILON;
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+ }
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+
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+ lastFPS = 1f / lastTPF;
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+ }
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+
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+ /**
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+ * <code>toString</code> returns the string representation of this timer
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+ * in the format: <br>
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+ * <br>
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+ * jme.utility.Timer@1db699b <br>
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+ * Time: {LONG} <br>
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+ * FPS: {LONG} <br>
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+ *
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+ * @return the string representation of this object.
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+ */
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+ @Override
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+ public String toString() {
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+ String string = super.toString();
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+ string += "\nTime: " + oldTime;
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+ string += "\nFPS: " + getFrameRate();
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+ return string;
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+ }
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+}
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nor..67