From 3f72e907e869370b98dc7519ae5fc53681376450 Mon Sep 17 00:00:00 2001
From: Michael Bien <mbien@fh-landshut.de>
Date: Sat, 27 Mar 2010 23:28:04 +0100
Subject: refactoring part 3 (impl package): renamed com.sun.opengl ->
com.jogamp.opengl.
---
.../classes/com/jogamp/opengl/impl/DRIHack.java | 127 +++++++++++++++++++++
1 file changed, 127 insertions(+)
create mode 100755 src/jogl/classes/com/jogamp/opengl/impl/DRIHack.java
(limited to 'src/jogl/classes/com/jogamp/opengl/impl/DRIHack.java')
diff --git a/src/jogl/classes/com/jogamp/opengl/impl/DRIHack.java b/src/jogl/classes/com/jogamp/opengl/impl/DRIHack.java
new file mode 100755
index 000000000..ede966259
--- /dev/null
+++ b/src/jogl/classes/com/jogamp/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.jogamp.opengl.impl;
+
+import java.io.*;
+import java.security.*;
+import com.jogamp.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. <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;
+
+ public static void begin() {
+ AccessController.doPrivileged(new PrivilegedAction() {
+ public Object run() {
+ String os = Debug.getProperty("os.name", false).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 (Debug.getProperty("jogl.drihack.disable", true) != 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;
+ }
+ }
+}
--
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