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/*
* Copyright (c) 2003 Sun Microsystems, Inc. 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.sun.opengl.impl;
import java.lang.ref.*;
import java.util.*;
import javax.media.opengl.*;
/** Provides a mechanism by which OpenGL contexts can share textures
and display lists in the face of multithreading and asynchronous
context creation as is inherent in the AWT and Swing. */
public class GLContextShareSet {
// This class is implemented with a WeakHashMap that goes from the
// contexts as keys to a complex data structure as value that tracks
// context creation and deletion.
private static Map/*<GLContext, WeakReference<ShareSet>>*/ shareMap = new WeakHashMap();
private static Object dummyValue = new Object();
private static class ShareSet {
private Map allShares = new WeakHashMap();
private Map createdShares = new WeakHashMap();
private Map destroyedShares = new WeakHashMap();
public void add(GLContext ctx) {
if (allShares.put(ctx, dummyValue) == null) {
// FIXME: downcast to GLContextImpl undesirable
if (((GLContextImpl) ctx).isCreated()) {
createdShares.put(ctx, dummyValue);
} else {
destroyedShares.put(ctx, dummyValue);
}
}
}
public GLContext getCreatedShare(GLContext ignore) {
for (Iterator iter = createdShares.keySet().iterator(); iter.hasNext(); ) {
GLContext ctx = (GLContext) iter.next();
if (ctx != ignore) {
return ctx;
}
}
return null;
}
public void contextCreated(GLContext ctx) {
Object res = destroyedShares.remove(ctx);
assert res != null : "State of ShareSet corrupted; thought context " +
ctx + " should have been in destroyed set but wasn't";
res = createdShares.put(ctx, dummyValue);
assert res == null : "State of ShareSet corrupted; thought context " +
ctx + " shouldn't have been in created set but was";
}
public void contextDestroyed(GLContext ctx) {
Object res = createdShares.remove(ctx);
assert res != null : "State of ShareSet corrupted; thought context " +
ctx + " should have been in created set but wasn't";
res = destroyedShares.put(ctx, dummyValue);
assert res == null : "State of ShareSet corrupted; thought context " +
ctx + " shouldn't have been in destroyed set but was";
}
}
/** Indicate that contexts <code>share1</code> and
<code>share2</code> will share textures and display lists. */
public static synchronized void registerSharing(GLContext share1, GLContext share2) {
ShareSet share = entryFor(share1);
if (share == null) {
share = entryFor(share2);
}
if (share == null) {
share = new ShareSet();
}
share.add(share1);
share.add(share2);
addEntry(share1, share);
addEntry(share2, share);
}
public static synchronized GLContext getShareContext(GLContext contextToCreate) {
ShareSet share = entryFor(contextToCreate);
if (share == null) {
return null;
}
return share.getCreatedShare(contextToCreate);
}
public static synchronized void contextCreated(GLContext context) {
ShareSet share = entryFor(context);
if (share != null) {
share.contextCreated(context);
}
}
public static synchronized void contextDestroyed(GLContext context) {
ShareSet share = entryFor(context);
if (share != null) {
share.contextDestroyed(context);
}
}
//----------------------------------------------------------------------
// Internals only below this point
//
private static ShareSet entryFor(GLContext context) {
return (ShareSet) shareMap.get(context);
}
private static void addEntry(GLContext context, ShareSet share) {
if (shareMap.get(context) == null) {
shareMap.put(context, share);
}
}
}
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