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/*
* Copyright (c) 2006 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.jogamp.opengl.impl;
import com.jogamp.common.os.NativeLibrary;
import com.jogamp.common.os.Platform;
import java.io.*;
import java.security.*;
/**
* Helper class for working around problems with open-source DRI
* drivers. In the current DRI implementation it is required that the
* symbols in libGL.so.1.2 be globally visible to be accessible from
* other libraries that are dynamically loaded by the implementation.
* Applications may typically satisfy this need either by linking
* against libGL.so on the command line (-lGL) or by dlopen'ing
* libGL.so.1.2 with the RTLD_GLOBAL flag. The JOGL implementation
* links against libGL on all platforms rather than forcing all OpenGL
* entry points to be called through a function pointer. This allows
* the JOGL library to link directly to core 1.1 OpenGL entry points
* like glVertex3f, while calling through function pointers for entry
* points from later OpenGL versions as well as from
* extensions. However, because libjogl.so (which links against
* libGL.so) is loaded by the JVM, and because the JVM implicitly uses
* RTLD_LOCAL in the implementation of System.loadLibrary(), this
* means via transitivity that the symbols for libGL.so have only
* RTLD_LOCAL visibility to the rest of the application, so the DRI
* drivers can not find the symbols required. <P>
*
* There are at least two possible solutions. One would be to change
* the JOGL implementation to call through function pointers uniformly
* so that it does not need to link against libGL.so. This is
* possible, but requires changes to GlueGen and also is not really
* necessary in any other situation than with the DRI drivers. Another
* solution is to force the first load of libGL.so.1.2 to be done
* dynamically with RTLD_GLOBAL before libjogl.so is loaded and causes
* libGL.so.1.2 to be loaded again. The NativeLibrary class in the
* GlueGen runtime has this property, and we use it to implement this
* workaround.
*/
public class DRIHack {
private static final boolean DEBUG = Debug.debug("DRIHack");
private static boolean driHackNeeded;
private static NativeLibrary oglLib;
static {
// Allow manual overriding for now as a workaround for
// problems seen in some situations -- needs more investigation
if (Debug.getProperty("jogl.drihack.disable", true) != null) {
driHackNeeded = false;
} else {
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
String os = Platform.getOS().toLowerCase();
// Do DRI hack on all Linux distributions for best robustness
driHackNeeded = os.startsWith("linux")
|| new File("/usr/lib/dri").exists()
|| new File("/usr/X11R6/lib/modules/dri").exists();
return null;
}
});
}
}
public static void begin() {
if (driHackNeeded) {
if (DEBUG) {
System.err.println("Beginning DRI hack");
}
// Try a few different variants for best robustness
// In theory probably only the first is necessary
oglLib = NativeLibrary.open("libGL.so.1", null);
if (DEBUG && oglLib != null) {
System.err.println(" Found libGL.so.1");
}
if (oglLib == null) {
oglLib = NativeLibrary.open("/usr/lib/libGL.so.1", null);
if (DEBUG && oglLib != null) {
System.err.println(" Found /usr/lib/libGL.so.1");
}
}
}
}
public static void end() {
if (oglLib != null) {
if (DEBUG) {
System.err.println("Ending DRI hack");
}
oglLib.close();
oglLib = null;
}
}
}
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