107 lines
3.7 KiB
Java
107 lines
3.7 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.opengl;
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import java.awt.Canvas;
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import java.awt.Component;
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import java.nio.ByteBuffer;
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import java.security.AccessController;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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import org.lwjgl.LWJGLException;
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import org.lwjgl.LWJGLUtil;
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/**
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*
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* @author elias_naur <elias_naur@users.sourceforge.net>
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* @version $Revision$
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* $Id$
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*/
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final class AWTSurfaceLock {
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private static final int WAIT_DELAY_MILLIS = 100;
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private final ByteBuffer lock_buffer;
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private boolean firstLockSucceeded;
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AWTSurfaceLock() {
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lock_buffer = createHandle();
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}
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private static native ByteBuffer createHandle();
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public ByteBuffer lockAndGetHandle(Canvas component) throws LWJGLException {
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while (!privilegedLockAndInitHandle(component)) {
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LWJGLUtil.log("Could not get drawing surface info, retrying...");
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try {
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Thread.sleep(WAIT_DELAY_MILLIS);
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} catch (InterruptedException e) {
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LWJGLUtil.log("Interrupted while retrying: " + e);
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}
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}
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return lock_buffer;
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}
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private boolean privilegedLockAndInitHandle(final Canvas component) throws LWJGLException {
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// Workaround for Sun JDK bug 4796548 which still exists in java for OS X
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// We need to elevate privileges because of an AWT bug. Please see
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// http://192.18.37.44/forums/index.php?topic=10572 for a discussion.
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// It is only needed on first call, so we avoid it on all subsequent calls
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// due to performance..
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if (firstLockSucceeded)
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return lockAndInitHandle(lock_buffer, component);
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else
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try {
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firstLockSucceeded = AccessController.doPrivileged(new PrivilegedExceptionAction<Boolean>() {
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public Boolean run() throws LWJGLException {
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return lockAndInitHandle(lock_buffer, component);
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}
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});
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return firstLockSucceeded;
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} catch (PrivilegedActionException e) {
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throw (LWJGLException) e.getException();
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}
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}
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private static native boolean lockAndInitHandle(ByteBuffer lock_buffer, Canvas component) throws LWJGLException;
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void unlock() throws LWJGLException {
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nUnlock(lock_buffer);
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}
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private static native void nUnlock(ByteBuffer lock_buffer) throws LWJGLException;
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}
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