Added sharing of display lists and textures among OpenGL contexts

through new methods in GLDrawableFactory; GLContext has not been
exposed in the public API. Tested with new simple TestContextSharing
demonstration on Windows, Linux and Mac OS X.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@18 232f8b59-042b-4e1e-8c03-345bb8c30851

1 files changed, 68 insertions, 0 deletions

diff --git a/src/net/java/games/jogl/GLContextHelper.java b/src/net/java/games/jogl/GLContextHelper.java
new file mode 100644
index 000000000..d99e17d39
--- /dev/null
+++ b/src/net/java/games/jogl/GLContextHelper.java
@@ -0,0 +1,68 @@
+/*
+ * 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;
+
+import net.java.games.jogl.impl.*;
+
+/** This package-private class helps extract a GLContext from a
+    GLDrawable. The getContext() method can not be placed in the
+    public API of GLDrawable without exposing the GLContext class to
+    the public API, which is not desired. */
+
+class GLContextHelper {
+  static GLContext getContext(GLDrawable drawable) throws GLException {
+    if (drawable == null) {
+      return null;
+    }
+
+    if (drawable instanceof GLCanvas) {
+      return ((GLCanvas) drawable).getContext();
+    } else if (drawable instanceof GLJPanel) {
+      return ((GLJPanel) drawable).getContext();
+    } else if (drawable instanceof GLPbufferImpl) {
+      return ((GLPbufferImpl) drawable).getContext();
+    } else {
+      throw new GLException(
+        "Sharing of contexts and display lists not supported among user-defined GLDrawables " +
+        "(unknown drawable type " + drawable.getClass().getName() + ")"
+      );
+    }
+  }
+}