/* * 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); } } }