Is there an example of extending the Animator class, I can replace it with my own thread that just calls GLCanvas.display(), but I’d rather extend animator instead.
Yes, there is an example. If you go and get one of the NeHe demos for jogl, and open up the jar, you’ll see there is a package called common. In common, there’s an FPSAnimator class that extends Animator. Both the source and the .class files are in the jar, and it’s easy to pull the FPSAnimator code into your own project. At least, this was the case for the OS X versions, but I imagine it’s the same on all platforms.
I went through the lessons and checked out the JoGL examples that different people submitted but none of them had the common package that I could find. Do you remember which demo it was or could you post the FPSAnimator.java file here?
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package demos.common;
import net.java.games.jogl.Animator;
import net.java.games.jogl.GLDrawable;
import net.java.games.jogl.GLException;
import java.util.Timer;
import java.util.TimerTask;
/**
* <P> An Animator can be attached to a GLDrawable to drive its
* display() method in a loop. For efficiency, it sets up the
* rendering thread for the drawable to be its own internal thread,
* so it can not be combined with manual repaints of the
* surface. </P>
*
* <P> The Animator currently contains a workaround for a bug in
* NVidia's drivers (80174). The current semantics are that once an
* Animator is created with a given GLDrawable as a target, repaints
* will likely be suspended for that GLDrawable until the Animator is
* started. This prevents multithreaded access to the context (which
* can be problematic) when the application's intent is for
* single-threaded access within the Animator. It is not guaranteed
* that repaints will be prevented during this time and applications
* should not rely on this behavior for correctness. </P>
*/
public class FPSAnimator extends Animator {
private GLDrawable drawable;
private RenderRunnable runnable = new RenderRunnable();
private Thread thread;
private boolean shouldStop;
private long delay;
private Timer renderTimer;
private ExceptionHandler exceptionHandler;
public FPSAnimator(GLDrawable drawable, int fps) {
this(drawable, fps, null);
}
/** Creates a new Animator for a particular drawable. */
public FPSAnimator(GLDrawable drawable, int fps, ExceptionHandler exceptionHandler) {
super(drawable);
this.exceptionHandler = exceptionHandler;
this.drawable = drawable;
this.delay = 1000 / fps;
}
/** Starts this animator. */
public synchronized void start() {
if (thread != null) {
throw new GLException("Already started");
}
thread = new Thread(runnable);
thread.start();
renderTimer = new Timer();
renderTimer.schedule(new TimerTask() {
public void run() {
runnable.nextFrame();
}
}, 0, delay);
}
/** Stops this animator, blocking until the animation thread has
finished. */
public synchronized void stop() {
shouldStop = true;
while (shouldStop && thread != null) {
try {
wait();
} catch (InterruptedException e) {
}
renderTimer.cancel();
}
shouldStop = false;
}
public boolean isFrameRateLimitEnabled() {
return runnable.isFrameRateLimitEnabled();
}
public void setFrameRateLimitEnabled(boolean frameRateLimit) {
runnable.setFrameRateLimitEnabled(frameRateLimit);
}
private class RenderRunnable implements Runnable {
private boolean frameRateLimitEnabled = true;
public boolean isFrameRateLimitEnabled() {
return frameRateLimitEnabled;
}
public void setFrameRateLimitEnabled(boolean frameRateLimit) {
frameRateLimitEnabled = frameRateLimit;
nextFrameSync();
}
public void nextFrame() {
if (frameRateLimitEnabled)
nextFrameSync();
}
private synchronized void nextFrameSync() {
notify();
}
public void run() {
boolean noException = false;
try {
// Try to get OpenGL context optimization since we know we
// will be rendering this one drawable continually from
// this thread; make the context current once instead of
// making it current and freeing it each frame.
drawable.setRenderingThread(Thread.currentThread());
// Since setRenderingThread is currently advisory (because
// of the poor JAWT implementation in the Motif AWT, which
// performs excessive locking) we also prevent repaint(),
// which is called from the AWT thread, from having an
// effect for better multithreading behavior. This call is
// not strictly necessary, but if end users write their
// own animation loops which update multiple drawables per
// tick then it may be necessary to enforce the order of
// updates.
drawable.setNoAutoRedrawMode(true);
while (!shouldStop) {
noException = false;
drawable.display();
if (frameRateLimitEnabled) {
synchronized (this) {
if (frameRateLimitEnabled) {
try {
wait();
} catch (InterruptedException e) {
}
}
}
}
noException = true;
}
} catch (Exception e) {
if (exceptionHandler != null)
exceptionHandler.handleException(e);
} finally {
shouldStop = false;
drawable.setNoAutoRedrawMode(false);
try {
// The surface is already unlocked and rendering
// thread is already null if an exception occurred
// during display(), so don't disable the rendering
// thread again.
if (noException) {
drawable.setRenderingThread(null);
}
} finally {
synchronized (FPSAnimator.this) {
thread = null;
FPSAnimator.this.notify();
}
}
}
}
}
}
Thanks.