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Java™ Binding for the OpenGL® API
/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
* Copyright (c) 2010 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution 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 Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.jogamp.opengl.util;
import java.util.Timer;
import java.util.TimerTask;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLException;
/**
* An Animator subclass which attempts to achieve a target
* frames-per-second rate to avoid using all CPU time. The target FPS
* is only an estimate and is not guaranteed.
*
* The Animator execution thread does not run as a daemon thread,
* so it is able to keep an application from terminating.
* Call {@link #stop() } to terminate the animation and it's execution thread.
*
*/
public class FPSAnimator extends AnimatorBase {
private Timer timer = null;
private MainTask task = null;
private int fps;
private boolean scheduleAtFixedRate;
private boolean isAnimating; // MainTask feedback
private volatile boolean shouldRun; // MainTask trigger
private volatile boolean shouldStop; // MainTask trigger
protected String getBaseName(String prefix) {
return "FPS" + prefix + "Animator" ;
}
/** Creates an FPSAnimator with a given target frames-per-second
value. Equivalent to FPSAnimator(null, fps). */
public FPSAnimator(int fps) {
this(null, fps);
}
/** Creates an FPSAnimator with a given target frames-per-second
value and a flag indicating whether to use fixed-rate
scheduling. Equivalent to FPSAnimator(null, fps,
scheduleAtFixedRate). */
public FPSAnimator(int fps, boolean scheduleAtFixedRate) {
this(null, fps, scheduleAtFixedRate);
}
/** Creates an FPSAnimator with a given target frames-per-second
value and an initial drawable to animate. Equivalent to
FPSAnimator(null, fps, false). */
public FPSAnimator(GLAutoDrawable drawable, int fps) {
this(drawable, fps, false);
}
/** Creates an FPSAnimator with a given target frames-per-second
value, an initial drawable to animate, and a flag indicating
whether to use fixed-rate scheduling. */
public FPSAnimator(GLAutoDrawable drawable, int fps, boolean scheduleAtFixedRate) {
super();
this.fps = fps;
if (drawable != null) {
add(drawable);
}
this.scheduleAtFixedRate = scheduleAtFixedRate;
}
/**
* @param fps
* @throws GLException if the animator has already been started
*/
public final synchronized void setFPS(int fps) throws GLException {
if ( isStartedImpl() ) {
throw new GLException("Animator already started.");
}
this.fps = fps;
}
public final int getFPS() { return fps; }
class MainTask extends TimerTask {
private boolean justStarted;
private boolean alreadyStopped;
private boolean alreadyPaused;
public MainTask() {
}
public void start(Timer timer) {
fpsCounter.resetFPSCounter();
shouldRun = true;
shouldStop = false;
justStarted = true;
alreadyStopped = false;
alreadyPaused = false;
final long period = 0 < fps ? (long) (1000.0f / (float) fps) : 1; // 0 -> 1: IllegalArgumentException: Non-positive period
if (scheduleAtFixedRate) {
timer.scheduleAtFixedRate(this, 0, period);
} else {
timer.schedule(this, 0, period);
}
}
public boolean isActive() { return !alreadyStopped && !alreadyPaused; }
public String toString() {
return "Task[thread "+animThread+", stopped "+alreadyStopped+", paused "+alreadyPaused+" shouldRun "+shouldRun+", shouldStop "+shouldStop+" -- started "+isStartedImpl()+", animating "+isAnimatingImpl()+", paused "+isPausedImpl()+", drawable "+drawables.size()+", drawablesEmpty "+drawablesEmpty+"]";
}
public void run() {
if( justStarted ) {
justStarted = false;
synchronized (FPSAnimator.this) {
animThread = Thread.currentThread();
if(DEBUG) {
System.err.println("FPSAnimator start/resume:" + Thread.currentThread() + ": " + toString());
}
isAnimating = true;
if( drawablesEmpty ) {
shouldRun = false; // isAnimating:=false @ pause below
} else {
shouldRun = true;
setDrawablesExclCtxState(exclusiveContext);
FPSAnimator.this.notifyAll();
}
System.err.println("FPSAnimator P1:" + Thread.currentThread() + ": " + toString());
}
}
if( shouldRun ) {
display();
} else if( shouldStop ) { // STOP
System.err.println("FPSAnimator P4: "+alreadyStopped+", "+ Thread.currentThread() + ": " + toString());
this.cancel();
if( !alreadyStopped ) {
alreadyStopped = true;
if( exclusiveContext && !drawablesEmpty ) {
setDrawablesExclCtxState(false);
display(); // propagate exclusive change!
}
synchronized (FPSAnimator.this) {
if(DEBUG) {
System.err.println("FPSAnimator stop " + Thread.currentThread() + ": " + toString());
}
animThread = null;
isAnimating = false;
FPSAnimator.this.notifyAll();
}
}
} else {
System.err.println("FPSAnimator P5: "+alreadyPaused+", "+ Thread.currentThread() + ": " + toString());
this.cancel();
if( !alreadyPaused ) { // PAUSE
alreadyPaused = true;
if( exclusiveContext && !drawablesEmpty ) {
setDrawablesExclCtxState(false);
display(); // propagate exclusive change!
}
synchronized (FPSAnimator.this) {
if(DEBUG) {
System.err.println("FPSAnimator pause " + Thread.currentThread() + ": " + toString());
}
isAnimating = false;
FPSAnimator.this.notifyAll();
}
}
}
}
}
private final boolean isAnimatingImpl() {
return animThread != null && isAnimating ;
}
public final boolean isAnimating() {
stateSync.lock();
try {
return animThread != null && isAnimating ;
} finally {
stateSync.unlock();
}
}
private final boolean isPausedImpl() {
return animThread != null && ( !shouldRun && !shouldStop ) ;
}
public final boolean isPaused() {
stateSync.lock();
try {
return animThread != null && ( !shouldRun && !shouldStop ) ;
} finally {
stateSync.unlock();
}
}
static int timerNo = 0;
public synchronized boolean start() {
if ( null != timer || null != task || isStartedImpl() ) {
return false;
}
timer = new Timer( getThreadName()+"-"+baseName+"-Timer"+(timerNo++) );
task = new MainTask();
if(DEBUG) {
System.err.println("FPSAnimator.start() START: "+task+", "+ Thread.currentThread() + ": " + toString());
}
task.start(timer);
final boolean res = finishLifecycleAction( drawablesEmpty ? waitForStartedEmptyCondition : waitForStartedAddedCondition,
POLLP_WAIT_FOR_FINISH_LIFECYCLE_ACTION);
if(DEBUG) {
System.err.println("FPSAnimator.start() END: "+task+", "+ Thread.currentThread() + ": " + toString());
}
if( drawablesEmpty ) {
task.cancel();
task = null;
}
return res;
}
private final Condition waitForStartedAddedCondition = new Condition() {
public boolean eval() {
return !isStartedImpl() || !isAnimating ;
} };
private final Condition waitForStartedEmptyCondition = new Condition() {
public boolean eval() {
return !isStartedImpl() || isAnimating ;
} };
/** Stops this FPSAnimator. Due to the implementation of the
FPSAnimator it is not guaranteed that the FPSAnimator will be
completely stopped by the time this method returns. */
public synchronized boolean stop() {
if ( null == timer || !isStartedImpl() ) {
return false;
}
if(DEBUG) {
System.err.println("FPSAnimator.stop() START: "+task+", "+ Thread.currentThread() + ": " + toString());
}
final boolean res;
if( null == task ) {
// start/resume case w/ drawablesEmpty
res = true;
} else {
shouldRun = false;
shouldStop = true;
res = finishLifecycleAction(waitForStoppedCondition, POLLP_WAIT_FOR_FINISH_LIFECYCLE_ACTION);
}
if(DEBUG) {
System.err.println("FPSAnimator.stop() END: "+task+", "+ Thread.currentThread() + ": " + toString());
}
if(null != task) {
task.cancel();
task = null;
}
if(null != timer) {
timer.cancel();
timer = null;
}
animThread = null;
return res;
}
private final Condition waitForStoppedCondition = new Condition() {
public boolean eval() {
return isStartedImpl();
} };
public synchronized boolean pause() {
if ( !isStartedImpl() || ( null != task && isPausedImpl() ) ) {
return false;
}
if(DEBUG) {
System.err.println("FPSAnimator.pause() START: "+task+", "+ Thread.currentThread() + ": " + toString());
}
final boolean res;
if( null == task ) {
// start/resume case w/ drawablesEmpty
res = true;
} else {
shouldRun = false;
res = finishLifecycleAction(waitForPausedCondition, POLLP_WAIT_FOR_FINISH_LIFECYCLE_ACTION);
}
if(DEBUG) {
System.err.println("FPSAnimator.pause() END: "+task+", "+ Thread.currentThread() + ": " + toString());
}
if(null != task) {
task.cancel();
task = null;
}
return res;
}
private final Condition waitForPausedCondition = new Condition() {
public boolean eval() {
// end waiting if stopped as well
return isAnimating && isStartedImpl();
} };
public synchronized boolean resume() {
if ( null != task || !isStartedImpl() || !isPausedImpl() ) {
return false;
}
if(DEBUG) {
System.err.println("FPSAnimator.resume() START: "+ Thread.currentThread() + ": " + toString());
}
final boolean res;
if( drawablesEmpty ) {
res = true;
} else {
task = new MainTask();
task.start(timer);
res = finishLifecycleAction(waitForResumeCondition, POLLP_WAIT_FOR_FINISH_LIFECYCLE_ACTION);
}
if(DEBUG) {
System.err.println("FPSAnimator.resume() END: "+task+", "+ Thread.currentThread() + ": " + toString());
}
return res;
}
private final Condition waitForResumeCondition = new Condition() {
public boolean eval() {
// end waiting if stopped as well
return !drawablesEmpty && !isAnimating && isStartedImpl();
} };
}