From a959c53b7ac91e489bf0959391e892790b9ff248 Mon Sep 17 00:00:00 2001 From: Kenneth Russel Date: Mon, 15 Jun 2009 22:57:38 +0000 Subject: Copied JOGL_2_SANDBOX r1957 on to trunk; JOGL_2_SANDBOX branch is now closed git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@1959 232f8b59-042b-4e1e-8c03-345bb8c30851 --- src/jogl/classes/com/sun/opengl/impl/DRIHack.java | 127 ++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100755 src/jogl/classes/com/sun/opengl/impl/DRIHack.java (limited to 'src/jogl/classes/com/sun/opengl/impl/DRIHack.java') diff --git a/src/jogl/classes/com/sun/opengl/impl/DRIHack.java b/src/jogl/classes/com/sun/opengl/impl/DRIHack.java new file mode 100755 index 000000000..5478bd2f3 --- /dev/null +++ b/src/jogl/classes/com/sun/opengl/impl/DRIHack.java @@ -0,0 +1,127 @@ +/* + * 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.sun.opengl.impl; + +import java.io.*; +import java.security.*; +import com.sun.gluegen.runtime.*; + +/** + * 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.

+ * + * 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; + + public static void begin() { + AccessController.doPrivileged(new PrivilegedAction() { + public Object run() { + String os = System.getProperty("os.name").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()); + // Allow manual overriding for now as a workaround for + // problems seen in some situations -- needs more investigation + if (System.getProperty("jogl.drihack.disable") != null) { + driHackNeeded = false; + } + return null; + } + }); + + 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; + } + } +} -- cgit v1.2.3