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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
* MIDROSYSTEMS, 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 net.java.games.jogl.impl;
import java.security.AccessController;
import java.security.PrivilegedAction;
/** Encapsulates the workaround of running all display operations on
the AWT event queue thread for the purposes of working around
problems seen primarily on ATI cards when rendering into a surface
that is simultaneously being resized by the event queue thread.
<p>
As of JOGL 1.1 b10, this property defaults to true. Problems have
been seen on Windows, Linux and Mac OS X platforms that are solved
by switching all OpenGL work to a single thread, which this
workaround provides. The forthcoming JSR-231 work will rethink how
such a mechanism is implemented, but the core result of needing to
perform all OpenGL work on a single thread for best compatibility
will remain.
*/
public class SingleThreadedWorkaround {
private static boolean singleThreadedWorkaround = true;
// If the user specified the workaround's system property (either
// true or false), don't let the automatic detection have any effect
private static boolean systemPropertySpecified = false;
static {
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
String workaround = System.getProperty("jogl.1thread");
if (workaround == null) {
// Old system property (for compatibility)
workaround = System.getProperty("JOGL_SINGLE_THREADED_WORKAROUND");
}
if (workaround == null) {
// Older system property (for compatibility)
workaround = System.getProperty("ATI_WORKAROUND");
}
if (workaround != null && (!workaround.equals("auto"))) {
systemPropertySpecified = true;
singleThreadedWorkaround = Boolean.valueOf(workaround).booleanValue();
}
printWorkaroundNotice();
return null;
}
});
}
/** Public method for users to disable the single-threaded
workaround in application code. Should perhaps eventually
promote this method to the public API. */
public static void disableWorkaround() {
systemPropertySpecified = true;
singleThreadedWorkaround = false;
if (Debug.verbose()) {
System.err.println("Application forced disabling of single-threaded workaround of dispatching display() on event thread");
}
}
public static void shouldDoWorkaround() {
if (!systemPropertySpecified) {
singleThreadedWorkaround = true;
printWorkaroundNotice();
}
}
public static boolean doWorkaround() {
return singleThreadedWorkaround;
}
private static void printWorkaroundNotice() {
if (singleThreadedWorkaround && Debug.verbose()) {
System.err.println("Using single-threaded workaround of dispatching display() on event thread");
}
}
}
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