com.jogamp.opengl.util.FPSAnimator Maven / Gradle / Ivy
/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
* Copyright (c) 2010 JogAmp Community. All rights reserved.
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* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
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* This software is provided "AS IS," without a warranty of any kind. ALL
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* 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 com.jogamp.opengl.GLAutoDrawable;
import com.jogamp.opengl.GLException;
import com.jogamp.common.ExceptionUtils;
/**
* 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 final boolean scheduleAtFixedRate;
private boolean isAnimating; // MainTask feedback
private volatile boolean pauseIssued; // MainTask trigger
private volatile boolean stopIssued; // MainTask trigger
@Override
protected String getBaseName(final String prefix) {
return "FPS" + prefix + "Animator" ;
}
/** Creates an FPSAnimator with a given target frames-per-second
value. Equivalent to FPSAnimator(null, fps). */
public FPSAnimator(final 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(final int fps, final 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(final GLAutoDrawable drawable, final 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(final GLAutoDrawable drawable, final int fps, final 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 void setFPS(final int fps) throws GLException {
if ( isStarted() ) {
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(final Timer timer) {
fpsCounter.resetFPSCounter();
pauseIssued = false;
stopIssued = false;
isAnimating = false;
justStarted = true;
alreadyStopped = false;
alreadyPaused = false;
final long period = 0 < fps ? (long) (1000.0f / 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; }
@Override
public final String toString() {
return "Task[thread "+animThread+", stopped "+alreadyStopped+", paused "+alreadyPaused+" pauseIssued "+pauseIssued+", stopIssued "+stopIssued+" -- started "+isStarted()+", animating "+isAnimatingImpl()+", paused "+isPaused()+", drawable "+drawables.size()+", drawablesEmpty "+drawablesEmpty+"]";
}
@Override
public void run() {
UncaughtAnimatorException caughtException = null;
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 ) {
pauseIssued = true; // isAnimating:=false @ pause below
} else {
pauseIssued = false;
setDrawablesExclCtxState(exclusiveContext); // may re-enable exclusive context
}
FPSAnimator.this.notifyAll(); // Wakes up 'waitForStartedCondition' sync -and resume from pause or drawablesEmpty
if(DEBUG) {
System.err.println("FPSAnimator P1:" + Thread.currentThread() + ": " + toString());
}
}
}
if( !pauseIssued && !stopIssued ) { // RUN
try {
display();
} catch (final UncaughtAnimatorException dre) {
caughtException = dre;
stopIssued = true;
}
} else if( pauseIssued && !stopIssued ) { // PAUSE
if(DEBUG) {
System.err.println("FPSAnimator pausing: "+alreadyPaused+", "+ Thread.currentThread() + ": " + toString());
}
this.cancel();
if( !alreadyPaused ) { // PAUSE
alreadyPaused = true;
if( exclusiveContext && !drawablesEmpty ) {
setDrawablesExclCtxState(false);
try {
display(); // propagate exclusive context -> off!
} catch (final UncaughtAnimatorException dre) {
caughtException = dre;
stopIssued = true;
}
}
if( null == caughtException ) {
synchronized (FPSAnimator.this) {
if(DEBUG) {
System.err.println("FPSAnimator pause " + Thread.currentThread() + ": " + toString());
}
isAnimating = false;
FPSAnimator.this.notifyAll();
}
}
}
}
if( stopIssued ) { // STOP incl. immediate exception handling of 'displayCaught'
if(DEBUG) {
System.err.println("FPSAnimator stopping: "+alreadyStopped+", "+ Thread.currentThread() + ": " + toString());
}
this.cancel();
if( !alreadyStopped ) {
alreadyStopped = true;
if( exclusiveContext && !drawablesEmpty ) {
setDrawablesExclCtxState(false);
try {
display(); // propagate exclusive context -> off!
} catch (final UncaughtAnimatorException dre) {
if( null == caughtException ) {
caughtException = dre;
} else {
System.err.println("FPSAnimator.setExclusiveContextThread: caught: "+dre.getMessage());
dre.printStackTrace();
}
}
}
boolean flushGLRunnables = false;
boolean throwCaughtException = false;
synchronized (FPSAnimator.this) {
if(DEBUG) {
System.err.println("FPSAnimator stop " + Thread.currentThread() + ": " + toString());
if( null != caughtException ) {
System.err.println("Animator caught: "+caughtException.getMessage());
caughtException.printStackTrace();
}
}
isAnimating = false;
if( null != caughtException ) {
flushGLRunnables = true;
throwCaughtException = !handleUncaughtException(caughtException);
}
animThread = null;
FPSAnimator.this.notifyAll();
}
if( flushGLRunnables ) {
flushGLRunnables();
}
if( throwCaughtException ) {
throw caughtException;
}
}
}
}
}
private final boolean isAnimatingImpl() {
return animThread != null && isAnimating ;
}
@Override
public final synchronized boolean isAnimating() {
return animThread != null && isAnimating ;
}
@Override
public final synchronized boolean isPaused() {
return animThread != null && pauseIssued;
}
static int timerNo = 0;
@Override
public final synchronized boolean start() {
if ( null != timer || null != task || isStarted() ) {
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() {
@Override
public boolean eval() {
return !isStarted() || !isAnimating ;
} };
private final Condition waitForStartedEmptyCondition = new Condition() {
@Override
public boolean eval() {
return !isStarted() || 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. */
@Override
public final synchronized boolean stop() {
if ( null == timer || !isStarted() ) {
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 {
stopIssued = 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() {
@Override
public boolean eval() {
return isStarted();
} };
@Override
public final synchronized boolean pause() {
if ( !isStarted() || pauseIssued ) {
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 {
pauseIssued = true;
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() {
@Override
public boolean eval() {
// end waiting if stopped as well
return isStarted() && isAnimating;
} };
@Override
public final synchronized boolean resume() {
if ( !isStarted() || !pauseIssued ) {
return false;
}
if(DEBUG) {
System.err.println("FPSAnimator.resume() START: "+ Thread.currentThread() + ": " + toString());
}
final boolean res;
if( drawablesEmpty ) {
res = true;
} else {
if( null != task ) {
if( DEBUG ) {
System.err.println("FPSAnimator.resume() Ops: !pauseIssued, but task != null: "+toString());
ExceptionUtils.dumpStack(System.err);
}
task.cancel();
task = null;
}
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() {
@Override
public boolean eval() {
// end waiting if stopped as well
return !drawablesEmpty && !isAnimating && isStarted();
} };
}