aboutsummaryrefslogtreecommitdiffstats
path: root/src/jogl/classes/com/jogamp/opengl/util/Animator.java
blob: e199dc045d47e89641c1c2d9a0a76afa1293b076 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
/*
 * 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 javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLException;

/** <P> An Animator can be attached to one or more {@link
    GLAutoDrawable}s to drive their display() methods in a loop. </P>

    <P> The Animator class creates a background thread in which the
    calls to <code>display()</code> are performed. After each drawable
    has been redrawn, a brief pause is performed to avoid swamping the
    CPU, unless {@link #setRunAsFastAsPossible} has been called.  </P>

 * <p>
 * The Animator execution thread does not run as a daemon thread,
 * so it is able to keep an application from terminating.<br>
 * Call {@link #stop() } to terminate the animation and it's execution thread.
 * </p>
 */
public class Animator extends AnimatorBase {
    /** @deprecated no more used */
    protected ThreadGroup threadGroup;
    /** @deprecated no more used */
    protected boolean isAnimating;
    /** @deprecated no more used */
    protected boolean pauseIssued;
    /** @deprecated no more used */
    protected volatile boolean stopIssued;

    private ThreadGroup threadGroup2;
    private Runnable runnable;
    private boolean runAsFastAsPossible;
    boolean isAnimating2;
    volatile boolean pauseIssued2;
    volatile boolean stopIssued2;

    /**
     * Creates a new, empty Animator.
     */
    public Animator() {
        super();
        if(DEBUG) {
            System.err.println("Animator created");
        }
    }

    /**
     * Creates a new Animator w/ an associated ThreadGroup.
     */
    public Animator(final ThreadGroup tg) {
        super();
        setThreadGroup(tg);
        if(DEBUG) {
            System.err.println("Animator created, ThreadGroup: "+threadGroup2);
        }
    }

    /**
     * Creates a new Animator for a particular drawable.
     */
    public Animator(final GLAutoDrawable drawable) {
        super();
        add(drawable);
        if(DEBUG) {
            System.err.println("Animator created, w/ "+drawable);
        }
    }

    /**
     * Creates a new Animator w/ an associated ThreadGroup for a particular drawable.
     */
    public Animator(final ThreadGroup tg, final GLAutoDrawable drawable) {
        super();
        setThreadGroup(tg);
        add(drawable);
        if(DEBUG) {
            System.err.println("Animator created, ThreadGroup: "+threadGroup2+" and "+drawable);
        }
    }

    @Override
    protected final String getBaseName(final String prefix) {
        return prefix + "Animator" ;
    }

    /**
     * Sets a flag in this Animator indicating that it is to run as
     * fast as possible. By default there is a brief pause in the
     * animation loop which prevents the CPU from getting swamped.
     * This method may not have an effect on subclasses.
     */
    public final synchronized void setRunAsFastAsPossible(final boolean runFast) {
        runAsFastAsPossible = runFast;
    }

    class MainLoop implements Runnable {
        @Override
        public String toString() {
            return "[started "+isStarted()+", animating "+isAnimating()+", paused "+isPaused()+", drawable "+drawables.size()+", drawablesEmpty "+drawablesEmpty+"]";
        }

        @Override
        public void run() {
            ThreadDeath caughtThreadDeath = null;
            UncaughtAnimatorException caughtException = null;

            try {
                synchronized (Animator.this) {
                    if(DEBUG) {
                        System.err.println("Animator start on " + getThreadName() + ": " + toString());
                    }
                    fpsCounter.resetFPSCounter();
                    animThread = Thread.currentThread();
                    isAnimating2 = false;
                    // 'waitForStartedCondition' wake-up is handled below!
                }

                while (!stopIssued2) {
                    synchronized (Animator.this) {
                        // Pause; Also don't consume CPU unless there is work to be done and not paused
                        boolean ectCleared = false;
                        while ( !stopIssued2 && ( pauseIssued2 || drawablesEmpty ) ) {
                            if( drawablesEmpty ) {
                                pauseIssued2 = true;
                            }
                            final boolean wasPaused = pauseIssued2;
                            if (DEBUG) {
                                System.err.println("Animator pause on " + animThread.getName() + ": " + toString());
                            }
                            if ( exclusiveContext && !drawablesEmpty && !ectCleared ) {
                                ectCleared = true;
                                setDrawablesExclCtxState(false);
                                try {
                                    display(); // propagate exclusive context -> off!
                                } catch (final UncaughtAnimatorException dre) {
                                    caughtException = dre;
                                    stopIssued2 = true;
                                    break; // end pause loop
                                }
                            }
                            isAnimating2 = false;
                            Animator.this.notifyAll();
                            try {
                                Animator.this.wait();
                            } catch (final InterruptedException e) {
                            }
                            if (wasPaused) {
                                // resume from pause -> reset counter
                                fpsCounter.resetFPSCounter();
                                if (DEBUG) {
                                    System.err.println("Animator resume on " + animThread.getName() + ": " + toString());
                                }
                            }
                        }
                        if (!stopIssued2 && !isAnimating2) {
                            // Wakes up 'waitForStartedCondition' sync
                            // - and -
                            // Resume from pause or drawablesEmpty,
                            // implies !pauseIssued and !drawablesEmpty
                            isAnimating2 = true;
                            setDrawablesExclCtxState(exclusiveContext); // may re-enable exclusive context
                            Animator.this.notifyAll();
                        }
                    } // sync Animator.this
                    if ( !pauseIssued2 && !stopIssued2 ) {
                        try {
                            display();
                        } catch (final UncaughtAnimatorException dre) {
                            caughtException = dre;
                            stopIssued2 = true;
                            break; // end animation loop
                        }
                        if ( !runAsFastAsPossible ) {
                            // Avoid swamping the CPU
                            Thread.yield();
                        }
                    }
                }
            } catch(final ThreadDeath td) {
                if(DEBUG) {
                    System.err.println("Animator caught: "+td.getClass().getName()+": "+td.getMessage());
                    td.printStackTrace();
                }
                caughtThreadDeath = td;
            }
            if( exclusiveContext && !drawablesEmpty ) {
                setDrawablesExclCtxState(false);
                try {
                    display(); // propagate exclusive context -> off!
                } catch (final UncaughtAnimatorException dre) {
                    if( null == caughtException ) {
                        caughtException = dre;
                    } else {
                        System.err.println("Animator.setExclusiveContextThread: caught: "+dre.getMessage());
                        dre.printStackTrace();
                    }
                }
            }
            boolean flushGLRunnables = false;
            boolean throwCaughtException = false;
            synchronized (Animator.this) {
                if(DEBUG) {
                    System.err.println("Animator stop on " + animThread.getName() + ": " + toString());
                    if( null != caughtException ) {
                        System.err.println("Animator caught: "+caughtException.getMessage());
                        caughtException.printStackTrace();
                    }
                }
                stopIssued2 = false;
                pauseIssued2 = false;
                isAnimating2 = false;
                if( null != caughtException ) {
                    flushGLRunnables = true;
                    if( null != uncaughtExceptionHandler ) {
                        handleUncaughtException(caughtException);
                        throwCaughtException = false;
                    } else {
                        throwCaughtException = true;
                    }
                }
                animThread = null;
                Animator.this.notifyAll();
            }
            if( flushGLRunnables ) {
                flushGLRunnables();
            }
            if( throwCaughtException ) {
                throw caughtException;
            }
            if( null != caughtThreadDeath ) {
                throw caughtThreadDeath;
            }
        }
    }

    @Override
    public final synchronized boolean isAnimating() {
        return animThread != null && isAnimating2 ;
    }

    @Override
    public final synchronized boolean isPaused() {
        return animThread != null && pauseIssued2 ;
    }

    /**
     * Set a {@link ThreadGroup} for the {@link #getThread() animation thread}.
     *
     * @param tg the {@link ThreadGroup}
     * @throws GLException if the animator has already been started
     */
    public final synchronized void setThreadGroup(final ThreadGroup tg) throws GLException {
        if ( isStarted() ) {
            throw new GLException("Animator already started.");
        }
        threadGroup2 = tg;
    }

    @Override
    public final synchronized boolean start() {
        if ( isStarted() ) {
            return false;
        }
        if (runnable == null) {
            runnable = new MainLoop();
        }
        fpsCounter.resetFPSCounter();
        final String threadName = getThreadName()+"-"+baseName;
        Thread thread;
        if(null==threadGroup2) {
            thread = new Thread(runnable, threadName);
        } else {
            thread = new Thread(threadGroup2, runnable, threadName);
        }
        thread.setDaemon(false); // force to be non daemon, regardless of parent thread
        if(DEBUG) {
            final Thread ct = Thread.currentThread();
            System.err.println("Animator "+ct.getName()+"[daemon "+ct.isDaemon()+"]: starting "+thread.getName()+"[daemon "+thread.isDaemon()+"]");
        }
        thread.start();
        return finishLifecycleAction(waitForStartedCondition, 0);
    }
    private final Condition waitForStartedCondition = new Condition() {
        @Override
        public boolean eval() {
            return !isStarted() || (!drawablesEmpty && !isAnimating2) ;
        } };

    @Override
    public final synchronized boolean stop() {
        if ( !isStarted() ) {
            return false;
        }
        stopIssued2 = true;
        return finishLifecycleAction(waitForStoppedCondition, 0);
    }
    private final Condition waitForStoppedCondition = new Condition() {
        @Override
        public boolean eval() {
            return isStarted();
        } };

    @Override
    public final synchronized boolean pause() {
        if ( !isStarted() || pauseIssued2 ) {
            return false;
        }
        pauseIssued2 = true;
        return finishLifecycleAction(waitForPausedCondition, 0);
    }
    private final Condition waitForPausedCondition = new Condition() {
        @Override
        public boolean eval() {
            // end waiting if stopped as well
            return isStarted() && isAnimating2;
        } };

    @Override
    public final synchronized boolean resume() {
        if ( !isStarted() || !pauseIssued2 ) {
            return false;
        }
        pauseIssued2 = false;
        return finishLifecycleAction(waitForResumeCondition, 0);
    }
    private final Condition waitForResumeCondition = new Condition() {
        @Override
        public boolean eval() {
            // end waiting if stopped as well
            return isStarted() && ( !drawablesEmpty && !isAnimating2 || drawablesEmpty && !pauseIssued2 ) ;
        } };
}