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Java™ Binding for the OpenGL® API
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/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
* Copyright (c) 2011 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 jogamp.opengl;
import java.util.ArrayList;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import com.jogamp.opengl.GLContext;
import com.jogamp.opengl.GLException;
/** Provides a deterministic mechanism by which OpenGL contexts can share textures
and display lists in the face of multithreading and asynchronous
context creation. */
public class GLContextShareSet {
private static final boolean DEBUG = GLContextImpl.DEBUG;
// This class is implemented using a HashMap which maps from all shared contexts
// to a share set, containing all shared contexts itself.
private static final Map shareMap = new IdentityHashMap();
private static class ShareSet {
private final Map createdShares = new IdentityHashMap();
private final Map destroyedShares = new IdentityHashMap();
public final void addNew(final GLContext slave, final GLContext master) {
final GLContext preMaster;
if ( slave.isCreated() ) {
preMaster = createdShares.put(slave, master);
} else {
preMaster= destroyedShares.put(slave, master);
}
if( null != preMaster ) {
throw new InternalError("State of ShareSet corrupted: Slave "+toHexString(slave.hashCode())+
" is not new w/ master "+toHexString(preMaster.hashCode()));
}
}
public final void addIfNew(final GLContext slave, final GLContext master) {
final GLContext preMaster = getMaster(master);
if( null == preMaster ) {
addNew(slave, master);
}
}
public final GLContext getMaster(final GLContext ctx) {
final GLContext c = createdShares.get(ctx);
return null != c ? c : destroyedShares.get(ctx);
}
public Set getCreatedShares() {
return createdShares.keySet();
}
public Set getDestroyedShares() {
return destroyedShares.keySet();
}
public void contextCreated(final GLContext ctx) {
final GLContext ctxMaster = destroyedShares.remove(ctx);
if( null == ctxMaster ) {
throw new InternalError("State of ShareSet corrupted: Context "+toHexString(ctx.hashCode())+
" should have been in destroyed-set");
}
final GLContext delMaster = createdShares.put(ctx, ctxMaster);
if( null != delMaster ) {
throw new InternalError("State of ShareSet corrupted: Context "+toHexString(ctx.hashCode())+
" shouldn't have been in created-set");
}
}
public void contextDestroyed(final GLContext ctx) {
final GLContext ctxMaster = createdShares.remove(ctx);
if( null == ctxMaster ) {
throw new InternalError("State of ShareSet corrupted: Context "+toHexString(ctx.hashCode())+
" should have been in created-set");
}
final GLContext delMaster = destroyedShares.put(ctx, ctxMaster);
if( null != delMaster ) {
throw new InternalError("State of ShareSet corrupted: Context "+toHexString(ctx.hashCode())+
" shouldn't have been in destroyed-set");
}
}
}
/** Indicate that contexts slave and
master will share textures and display lists. Both
must be non-null. */
public static synchronized void registerSharing(final GLContext slave, final GLContext master) {
if (slave == null || master == null) {
throw new IllegalArgumentException("Both slave and master must be non-null");
}
ShareSet share = entryFor(slave);
if ( null == share ) {
share = entryFor(master);
}
if ( null == share ) {
share = new ShareSet();
}
share.addNew(slave, master);
share.addIfNew(master, master); // this master could have a different master shared registered earlier!
addEntry(slave, share);
addEntry(master, share);
if (DEBUG) {
System.err.println("GLContextShareSet: registereSharing: 1: " +
toHexString(slave.hashCode()) + ", 2: " + toHexString(master.hashCode()));
}
}
public static synchronized void unregisterSharing(final GLContext lastContext) {
if (lastContext == null) {
throw new IllegalArgumentException("Last context is null");
}
final ShareSet share = entryFor(lastContext);
if (share == null) {
throw new GLException("Last context is unknown: "+lastContext);
}
Set s = share.getCreatedShares();
if(s.size()>0) {
throw new GLException("Last context's share set contains "+s.size()+" non destroyed context");
}
s = share.getDestroyedShares();
if(s.size()==0) {
throw new GLException("Last context's share set contains no destroyed context");
}
if (DEBUG) {
System.err.println("GLContextShareSet: unregisterSharing: " +
toHexString(lastContext.hashCode())+", entries: "+s.size());
}
for(final Iterator iter = s.iterator() ; iter.hasNext() ; ) {
final GLContext ctx = iter.next();
if(null == removeEntry(ctx)) {
throw new GLException("Removal of shareSet for context failed");
}
}
}
/** Returns true if the given GLContext is shared, otherwise false. */
public static synchronized boolean isShared(final GLContext context) {
if (context == null) {
throw new IllegalArgumentException("context is null");
}
final ShareSet share = entryFor(context);
return share != null;
}
/**
* Returns the shared master GLContext of the given context if shared, otherwise return null.
*
* Returns the given context, if it is a shared master.
*
*/
public static synchronized GLContext getSharedMaster(final GLContext context) {
final ShareSet share = entryFor(context);
if (share == null) {
return null;
}
return share.getMaster(context);
}
private static synchronized Set getCreatedSharesImpl(final GLContext context) {
if (context == null) {
throw new IllegalArgumentException("context is null");
}
final ShareSet share = entryFor(context);
if (share != null) {
return share.getCreatedShares();
}
return null;
}
private static synchronized Set getDestroyedSharesImpl(final GLContext context) {
if (context == null) {
throw new IllegalArgumentException("context is null");
}
final ShareSet share = entryFor(context);
if (share != null) {
return share.getDestroyedShares();
}
return null;
}
/** Returns true if the given GLContext has shared and created GLContext left including itself, otherwise false. */
public static synchronized boolean hasCreatedSharedLeft(final GLContext context) {
final Set s = getCreatedSharesImpl(context);
return null != s && s.size() > 0;
}
/** Returns a new array-list of created GLContext shared with the given GLContext. */
public static synchronized ArrayList getCreatedShares(final GLContext context) {
final ArrayList otherShares = new ArrayList();
final Set createdShares = getCreatedSharesImpl(context);
if( null != createdShares ) {
for (final Iterator iter = createdShares.iterator(); iter.hasNext(); ) {
final GLContext ctx = iter.next();
if (ctx != context) {
otherShares.add(ctx);
}
}
}
return otherShares;
}
/** Returns a new array-list of destroyed GLContext shared with the given GLContext. */
public static synchronized ArrayList getDestroyedShares(final GLContext context) {
final ArrayList otherShares = new ArrayList();
final Set destroyedShares = getDestroyedSharesImpl(context);
if( null != destroyedShares ) {
for (final Iterator iter = destroyedShares.iterator(); iter.hasNext(); ) {
final GLContext ctx = iter.next();
if (ctx != context) {
otherShares.add(ctx);
}
}
}
return otherShares;
}
/** Mark the given GLContext as being created. */
public static synchronized boolean contextCreated(final GLContext context) {
final ShareSet share = entryFor(context);
if (share != null) {
share.contextCreated(context);
return true;
}
return false;
}
/** Mark the given GLContext as being destroyed. */
public static synchronized boolean contextDestroyed(final GLContext context) {
final ShareSet share = entryFor(context);
if (share != null) {
share.contextDestroyed(context);
return true;
}
return false;
}
//----------------------------------------------------------------------
// Internals only below this point
private static ShareSet entryFor(final GLContext context) {
return shareMap.get(context);
}
private static void addEntry(final GLContext context, final ShareSet share) {
if (shareMap.get(context) == null) {
shareMap.put(context, share);
}
}
private static ShareSet removeEntry(final GLContext context) {
return shareMap.remove(context);
}
private static String toHexString(final long hex) {
return "0x" + Long.toHexString(hex);
}
}