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diff --git a/src/classes/javax/media/opengl/GLContext.java b/src/classes/javax/media/opengl/GLContext.java
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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 javax.media.opengl;
+
+/** Abstraction for an OpenGL rendering context. In order to perform
+    OpenGL rendering, a context must be "made current" on the current
+    thread. OpenGL rendering semantics specify that only one context
+    may be current on the current thread at any given time, and also
+    that a given context may be current on only one thread at any
+    given time. Because components can be added to and removed from
+    the component hierarchy at any time, it is possible that the
+    underlying OpenGL context may need to be destroyed and recreated
+    multiple times over the lifetime of a given component. This
+    process is handled by the implementation, and the GLContext
+    abstraction provides a stable object which clients can use to
+    refer to a given context. */
+
+public abstract class GLContext {
+  /** Indicates that the context was not made current during the last call to {@link #makeCurrent makeCurrent}. */
+  public static final int CONTEXT_NOT_CURRENT = 0;
+  /** Indicates that the context was made current during the last call to {@link #makeCurrent makeCurrent}. */
+  public static final int CONTEXT_CURRENT     = 1;
+  /** Indicates that a newly-created context was made current during the last call to {@link #makeCurrent makeCurrent}. */
+  public static final int CONTEXT_CURRENT_NEW = 2;
+
+  private static ThreadLocal currentContext = new ThreadLocal();
+
+  /**
+   * Returns the GLDrawable to which this context may be used to
+   * draw.
+   */
+  public abstract GLDrawable getGLDrawable();
+
+  /**
+   * Makes this GLContext current on the calling thread.
+   *
+   * There are two return values that indicate success and one that
+   * indicates failure. A return value of CONTEXT_CURRENT_NEW
+   * indicates that that context has been made current, and that
+   * this is the first time this context has been made current, or
+   * that the state of the underlying context or drawable may have
+   * changed since the last time this context was made current. In
+   * this case, the application may wish to initialize the state.  A
+   * return value of CONTEXT_CURRENT indicates that the context has
+   * been made currrent, with its previous state restored.
+   * 
+   * If the context could not be made current (for example, because
+   * the underlying drawable has not ben realized on the display) ,
+   * a value of CONTEXT_NOT_CURRENT is returned.
+   *
+   * If the context is in use by another thread at the time of the
+   * call, then if isSynchronized() is true the call will
+   * block. If isSynchronized() is false, an exception will be
+   * thrown and the context will remain current on the other thread.
+   *
+   * @return CONTEXT_CURRENT if the context was successfully made current
+   * @return CONTEXT_CURRENT_NEW if the context was successfully made
+   * current, but need to be initialized.
+   *
+   * @return CONTEXT_NOT_CURRENT if the context could not be made current.
+   *
+   * @throws GLException if synchronization is disabled and the
+   * context is current on another thread, or because the context
+   * could not be created or made current due to non-recoverable,
+   * window system-specific errors.
+   */
+  public abstract int makeCurrent() throws GLException;
+
+  /**
+   * Releases control of this GLContext from the current thread.
+   *
+   * @throws GLException if the context had not previously been made
+   * current on the current thread
+   */
+  public abstract void release() throws GLException;
+
+  /**
+   * Returns the context which is current on the current thread. If no
+   * context is current, returns null.
+   *
+   * @return the context current on this thread, or null if no context
+   * is current.
+   */
+  public static GLContext getCurrent() {
+    return (GLContext) currentContext.get();
+  }
+
+  /**
+   * Sets the current context object on the current thread. This
+   * method is called by GLContext implementations during {@link
+   * #makeCurrent} and does not need to be called by end users.
+   *
+   */
+  public static void setCurrent(GLContext cur) {
+    currentContext.set(cur);
+  }
+  
+  /**
+   * Destroys this OpenGL context and frees its associated resources.
+   */
+  public abstract void destroy();
+
+  /**
+   * Returns true if 'makeCurrent' will exhibit synchronized behavior.
+   */
+  public abstract boolean isSynchronized();
+    
+  /** 
+   * Determines whether 'makeCurrent' will exhibit synchronized behavior.
+   */
+  public abstract void setSynchronized(boolean isSynchronized);
+
+  /**
+   * Returns the GL pipeline object for this GLContext.
+   */
+  public abstract GL getGL();
+
+  /**
+   * Sets the GL pipeline object for this GLContext.
+   */
+  public abstract void setGL(GL gl);
+}