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| 1 | +/* | |
| 2 | + * Copyright (c) 2005, 2007, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.java2d.opengl; | |
| 27 | + | |
| 28 | +import sun.java2d.pipe.RenderBuffer; | |
| 29 | +import sun.java2d.pipe.RenderQueue; | |
| 30 | +import static sun.java2d.pipe.BufferedOpCodes.*; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * OGL-specific implementation of RenderQueue. This class provides a | |
| 34 | + * single (daemon) thread that is responsible for periodically flushing | |
| 35 | + * the queue, thus ensuring that only one thread communicates with the native | |
| 36 | + * OpenGL libraries for the entire process. | |
| 37 | + */ | |
| 38 | +public class OGLRenderQueue extends RenderQueue { | |
| 39 | + | |
| 40 | + private static OGLRenderQueue theInstance; | |
| 41 | + private final QueueFlusher flusher; | |
| 42 | + | |
| 43 | + private OGLRenderQueue() { | |
| 44 | + flusher = new QueueFlusher(); | |
| 45 | + } | |
| 46 | + | |
| 47 | + /** | |
| 48 | + * Returns the single OGLRenderQueue instance. If it has not yet been | |
| 49 | + * initialized, this method will first construct the single instance | |
| 50 | + * before returning it. | |
| 51 | + */ | |
| 52 | + public static synchronized OGLRenderQueue getInstance() { | |
| 53 | + if (theInstance == null) { | |
| 54 | + theInstance = new OGLRenderQueue(); | |
| 55 | + } | |
| 56 | + return theInstance; | |
| 57 | + } | |
| 58 | + | |
| 59 | + /** | |
| 60 | + * Flushes the single OGLRenderQueue instance synchronously. If an | |
| 61 | + * OGLRenderQueue has not yet been instantiated, this method is a no-op. | |
| 62 | + * This method is useful in the case of Toolkit.sync(), in which we want | |
| 63 | + * to flush the OGL pipeline, but only if the OGL pipeline is currently | |
| 64 | + * enabled. Since this class has few external dependencies, callers need | |
| 65 | + * not be concerned that calling this method will trigger initialization | |
| 66 | + * of the OGL pipeline and related classes. | |
| 67 | + */ | |
| 68 | + public static void sync() { | |
| 69 | + if (theInstance != null) { | |
| 70 | + theInstance.lock(); | |
| 71 | + try { | |
| 72 | + theInstance.ensureCapacity(4); | |
| 73 | + theInstance.getBuffer().putInt(SYNC); | |
| 74 | + theInstance.flushNow(); | |
| 75 | + } finally { | |
| 76 | + theInstance.unlock(); | |
| 77 | + } | |
| 78 | + } | |
| 79 | + } | |
| 80 | + | |
| 81 | + /** | |
| 82 | + * Disposes the native memory associated with the given native | |
| 83 | + * graphics config info pointer on the single queue flushing thread. | |
| 84 | + */ | |
| 85 | + public static void disposeGraphicsConfig(long pConfigInfo) { | |
| 86 | + OGLRenderQueue rq = getInstance(); | |
| 87 | + rq.lock(); | |
| 88 | + try { | |
| 89 | + // make sure we make the context associated with the given | |
| 90 | + // GraphicsConfig current before disposing the native resources | |
| 91 | + OGLContext.setScratchSurface(pConfigInfo); | |
| 92 | + | |
| 93 | + RenderBuffer buf = rq.getBuffer(); | |
| 94 | + rq.ensureCapacityAndAlignment(12, 4); | |
| 95 | + buf.putInt(DISPOSE_CONFIG); | |
| 96 | + buf.putLong(pConfigInfo); | |
| 97 | + | |
| 98 | + // this call is expected to complete synchronously, so flush now | |
| 99 | + rq.flushNow(); | |
| 100 | + } finally { | |
| 101 | + rq.unlock(); | |
| 102 | + } | |
| 103 | + } | |
| 104 | + | |
| 105 | + /** | |
| 106 | + * Returns true if the current thread is the OGL QueueFlusher thread. | |
| 107 | + */ | |
| 108 | + public static boolean isQueueFlusherThread() { | |
| 109 | + return (Thread.currentThread() == getInstance().flusher); | |
| 110 | + } | |
| 111 | + | |
| 112 | + public void flushNow() { | |
| 113 | + // assert lock.isHeldByCurrentThread(); | |
| 114 | + try { | |
| 115 | + flusher.flushNow(); | |
| 116 | + } catch (Exception e) { | |
| 117 | + System.err.println("exception in flushNow:"); | |
| 118 | + e.printStackTrace(); | |
| 119 | + } | |
| 120 | + } | |
| 121 | + | |
| 122 | + public void flushAndInvokeNow(Runnable r) { | |
| 123 | + // assert lock.isHeldByCurrentThread(); | |
| 124 | + try { | |
| 125 | + flusher.flushAndInvokeNow(r); | |
| 126 | + } catch (Exception e) { | |
| 127 | + System.err.println("exception in flushAndInvokeNow:"); | |
| 128 | + e.printStackTrace(); | |
| 129 | + } | |
| 130 | + } | |
| 131 | + | |
| 132 | + private native void flushBuffer(long buf, int limit); | |
| 133 | + | |
| 134 | + private void flushBuffer() { | |
| 135 | + // assert lock.isHeldByCurrentThread(); | |
| 136 | + int limit = buf.position(); | |
| 137 | + if (limit > 0) { | |
| 138 | + // process the queue | |
| 139 | + flushBuffer(buf.getAddress(), limit); | |
| 140 | + } | |
| 141 | + // reset the buffer position | |
| 142 | + buf.clear(); | |
| 143 | + // clear the set of references, since we no longer need them | |
| 144 | + refSet.clear(); | |
| 145 | + } | |
| 146 | + | |
| 147 | + private class QueueFlusher extends Thread { | |
| 148 | + private boolean needsFlush; | |
| 149 | + private Runnable task; | |
| 150 | + private Error error; | |
| 151 | + | |
| 152 | + public QueueFlusher() { | |
| 153 | + super("Java2D Queue Flusher"); | |
| 154 | + setDaemon(true); | |
| 155 | + setPriority(Thread.MAX_PRIORITY); | |
| 156 | + start(); | |
| 157 | + } | |
| 158 | + | |
| 159 | + public synchronized void flushNow() { | |
| 160 | + // wake up the flusher | |
| 161 | + needsFlush = true; | |
| 162 | + notify(); | |
| 163 | + | |
| 164 | + // wait for flush to complete | |
| 165 | + while (needsFlush) { | |
| 166 | + try { | |
| 167 | + wait(); | |
| 168 | + } catch (InterruptedException e) { | |
| 169 | + } | |
| 170 | + } | |
| 171 | + | |
| 172 | + // re-throw any error that may have occurred during the flush | |
| 173 | + if (error != null) { | |
| 174 | + throw error; | |
| 175 | + } | |
| 176 | + } | |
| 177 | + | |
| 178 | + public synchronized void flushAndInvokeNow(Runnable task) { | |
| 179 | + this.task = task; | |
| 180 | + flushNow(); | |
| 181 | + } | |
| 182 | + | |
| 183 | + public synchronized void run() { | |
| 184 | + boolean timedOut = false; | |
| 185 | + while (true) { | |
| 186 | + while (!needsFlush) { | |
| 187 | + try { | |
| 188 | + timedOut = false; | |
| 189 | + /* | |
| 190 | + * Wait until we're woken up with a flushNow() call, | |
| 191 | + * or the timeout period elapses (so that we can | |
| 192 | + * flush the queue periodically). | |
| 193 | + */ | |
| 194 | + wait(100); | |
| 195 | + /* | |
| 196 | + * We will automatically flush the queue if the | |
| 197 | + * following conditions apply: | |
| 198 | + * - the wait() timed out | |
| 199 | + * - we can lock the queue (without blocking) | |
| 200 | + * - there is something in the queue to flush | |
| 201 | + * Otherwise, just continue (we'll flush eventually). | |
| 202 | + */ | |
| 203 | + if (!needsFlush && (timedOut = tryLock())) { | |
| 204 | + if (buf.position() > 0) { | |
| 205 | + needsFlush = true; | |
| 206 | + } else { | |
| 207 | + unlock(); | |
| 208 | + } | |
| 209 | + } | |
| 210 | + } catch (InterruptedException e) { | |
| 211 | + } | |
| 212 | + } | |
| 213 | + try { | |
| 214 | + // reset the throwable state | |
| 215 | + error = null; | |
| 216 | + // flush the buffer now | |
| 217 | + flushBuffer(); | |
| 218 | + // if there's a task, invoke that now as well | |
| 219 | + if (task != null) { | |
| 220 | + task.run(); | |
| 221 | + } | |
| 222 | + } catch (Error e) { | |
| 223 | + error = e; | |
| 224 | + } catch (Exception x) { | |
| 225 | + System.err.println("exception in QueueFlusher:"); | |
| 226 | + x.printStackTrace(); | |
| 227 | + } finally { | |
| 228 | + if (timedOut) { | |
| 229 | + unlock(); | |
| 230 | + } | |
| 231 | + task = null; | |
| 232 | + // allow the waiting thread to continue | |
| 233 | + needsFlush = false; | |
| 234 | + notify(); | |
| 235 | + } | |
| 236 | + } | |
| 237 | + } | |
| 238 | + } | |
| 239 | +} | |