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diff --git a/src/net/java/games/jogl/impl/GLContext.java b/src/net/java/games/jogl/impl/GLContext.java
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+++ b/src/net/java/games/jogl/impl/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 net.java.games.jogl.impl;
+
+import java.awt.Component;
+import java.awt.EventQueue;
+import net.java.games.jogl.*;
+
+public abstract class GLContext {
+  protected static final boolean DEBUG = false;
+
+  static {
+    NativeLibLoader.load();
+  }
+
+  protected Component component;
+
+  // Indicates whether the component (if an onscreen context) has been
+  // realized. Plausibly, before the component is realized the JAWT
+  // should return an error or NULL object from some of its
+  // operations; this appears to be the case on Win32 but is not true
+  // at least with Sun's current X11 implementation (1.4.x), which
+  // crashes with no other error reported if the DrawingSurfaceInfo is
+  // fetched from a locked DrawingSurface during the validation as a
+  // result of calling show() on the main thread. To work around this
+  // we prevent any JAWT or OpenGL operations from being done until
+  // the first event is received from the AWT event dispatch thread.
+  private boolean realized;
+
+  // This avoids (as much as possible) losing the effects of
+  // setRenderingThread, which may need to be deferred if the
+  // component is not realized
+  private boolean deferredSetRenderingThread;
+
+  protected GLCapabilities capabilities;
+  protected GLCapabilitiesChooser chooser;
+  protected GL gl;
+  // All GLU interfaces eventually route calls down to gluRoot. It can be
+  // static because GLU it doesn't actually need to own context, it just makes
+  // GL calls and assumes some context is active.
+  protected static final GLU gluRoot = new GLUImpl();
+  protected static GLU glu = gluRoot; // this is the context's GLU interface
+  protected Thread renderingThread;
+  protected Runnable deferredReshapeAction;
+
+  // This is a workaround for a bug in NVidia's drivers where
+  // vertex_array_range is only safe for single-threaded use; a bug
+  // has been filed, ID 80174. When an Animator is created for a
+  // GLDrawable, the expectation is that the Animator will be started
+  // shortly and that the user doesn't want rendering to occur from
+  // the AWT thread. However, there is a small window between when the
+  // Animator is created and attached to the GLDrawable and when it's
+  // started (and sets the rendering thread) when repaint events can
+  // be issued by the AWT thread if the component is realized. To work
+  // around this problem, we currently specify in the Animator's API
+  // that between the time it's created and started no redraws will
+  // occur.
+  protected volatile boolean willSetRenderingThread;
+
+  // Flag for disabling all repaint and resize processing on the AWT
+  // thread to avoid application-level deadlocks; only really used for
+  // GLCanvas
+  protected boolean noAutoRedraw;
+
+  // Offscreen context handling. Offscreen contexts should handle
+  // these resize requests in makeCurrent and clear the
+  // pendingOffscreenResize flag.
+  protected boolean pendingOffscreenResize;
+  protected int     pendingOffscreenWidth;
+  protected int     pendingOffscreenHeight;
+
+  // Cache of the functions that are available to be called at the current
+  // moment in time
+  protected FunctionAvailabilityCache functionAvailability;
+      
+  public GLContext(Component component, GLCapabilities capabilities, GLCapabilitiesChooser chooser) {
+    this.component = component;
+    try {
+      this.capabilities = (GLCapabilities) capabilities.clone();
+    } catch (CloneNotSupportedException e) {
+      throw new GLException(e);
+    }
+    this.chooser = chooser;
+    gl = createGL();
+    functionAvailability = new FunctionAvailabilityCache(this);
+  }
+
+  /** Runs the given runnable with this OpenGL context valid. */
+  public synchronized void invokeGL(Runnable runnable, boolean isReshape, Runnable initAction) throws GLException {
+    Thread currentThread = null;
+    
+    // Defer JAWT and OpenGL operations until onscreen components are
+    // realized
+    if (!realized()) {
+      realized = EventQueue.isDispatchThread();
+    }
+
+    if (!realized() ||
+	willSetRenderingThread ||
+        (renderingThread != null &&
+         renderingThread != (currentThread = Thread.currentThread()))) {
+      if (isReshape) {
+        deferredReshapeAction = runnable;
+      }
+      return;
+    }
+
+    if (isReshape && noAutoRedraw) {
+      // Don't process reshape requests on the AWT thread
+      deferredReshapeAction = runnable;
+      return;
+    }
+
+    if (renderingThread == null || deferredSetRenderingThread) {
+      deferredSetRenderingThread = false;
+      if (!makeCurrent(initAction)) {
+        // Couldn't make the thread current because the component has not yet
+        // been visualized, and therefore the context cannot be created.
+        // We'll defer any actions until invokeGL() is called again at a time
+        // when the component has been visualized.
+        if (isReshape) {
+          deferredReshapeAction = runnable;
+        }
+        return;
+      }
+    }
+
+    // At this point the OpenGL context is current. Offscreen contexts
+    // handle resizing the backing bitmap in makeCurrent. Therefore we
+    // may need to free and make the context current again if we
+    // didn't actually make it current above.
+    if (pendingOffscreenResize && renderingThread != null) {
+      free();
+      if (!makeCurrent(initAction)) {
+        throw new GLException("Error while resizing offscreen context");
+      }
+    }
+
+    boolean caughtException = false;
+
+    try {
+      if (deferredReshapeAction != null) {
+        deferredReshapeAction.run();
+        deferredReshapeAction = null;
+      }
+      runnable.run();
+      swapBuffers();
+    } catch (RuntimeException e) {
+      caughtException = true;
+      throw(e);
+    } finally {
+      if (caughtException) {
+        // Disallow setRenderingThread if display action is throwing exceptions
+        renderingThread = null;
+      }
+      if (renderingThread == null) {
+        free();
+      }
+    }
+  }
+
+  public GL getGL() {
+    return gl;
+  }
+
+  public void setGL(GL gl) {
+    this.gl = gl;
+  }
+
+  public GLU getGLU() {    
+    return glu;
+  }
+  
+  public void setGLU(GLU glu) {
+    this.glu = glu;
+  }
+  
+  /** Gives a hint to the context that setRenderingThread will be
+      called in the near future; causes redraws to be halted. This is
+      a workaround for bugs in NVidia's drivers and is used only by
+      the Animator class. */
+  public synchronized void willSetRenderingThread() {
+    this.willSetRenderingThread = true;
+  }
+
+  public synchronized void setRenderingThread(Thread currentThreadOrNull, Runnable initAction) {
+    Thread currentThread = Thread.currentThread();
+    if (currentThreadOrNull != null && currentThreadOrNull != currentThread) {
+      throw new GLException("Argument must be either the current thread or null");
+    }
+    if (renderingThread != null && currentThreadOrNull != null) {
+      throw new GLException("Attempt to re-set or change rendering thread");
+    }
+    if (renderingThread == null && currentThreadOrNull == null) {
+      throw new GLException("Attempt to clear rendering thread when already cleared");
+    }
+    this.willSetRenderingThread = false;
+    if (currentThreadOrNull == null) {
+      renderingThread = null;
+      if (realized()) {
+        // We are guaranteed to own the context
+        free();
+      }
+    } else {
+      renderingThread = currentThreadOrNull;
+      if (realized()) {
+        makeCurrent(initAction);
+      }
+    }
+  }
+
+  public Thread getRenderingThread() {
+    return renderingThread;
+  }
+
+  public void setNoAutoRedrawMode(boolean noAutoRedraw) {
+    this.noAutoRedraw = noAutoRedraw;
+  }
+
+  public boolean getNoAutoRedrawMode() {
+    return noAutoRedraw;
+  }
+
+  /** Routine needed only for offscreen contexts in order to resize
+      the underlying bitmap. Called by GLJPanel. */
+  public void resizeOffscreenContext(int newWidth, int newHeight) {
+    if (!isOffscreen()) {
+      throw new GLException("Should only call for offscreen OpenGL contexts");
+    }
+    pendingOffscreenResize = true;
+    pendingOffscreenWidth  = newWidth;
+    pendingOffscreenHeight = newHeight;
+  }
+
+  /** Returns a non-null (but possibly empty) string containing the
+      space-separated list of available platform-dependent (e.g., WGL,
+      GLX) extensions. Can only be called while this context is
+      current. */
+  public abstract String getPlatformExtensionsString();
+
+  /**
+   * Resets the cache of which GL functions are available for calling through this
+   * context. See {@link #isFunctionAvailable(String)} for more information on
+   * the definition of "available".
+   */
+  protected void resetGLFunctionAvailability() {
+    functionAvailability.flush();
+  }
+
+  /**
+   * Returns true if the specified OpenGL core- or extension-function can be
+   * successfully called using this GL context given the current host (OpenGL
+   * <i>client</i>) and display (OpenGL <i>server</i>) configuration.
+   *
+   * See {@link GL#isFunctionAvailable(String)} for more details.
+   *
+   * @param glFunctionName the name of the OpenGL function (e.g., use
+   * "glPolygonOffsetEXT" to check if the {@link
+   * net.java.games.jogl.glPolygonOffsetEXT(float,float)} is available).
+   */
+  protected boolean isFunctionAvailable(String glFunctionName) {
+    return functionAvailability.isFunctionAvailable(mapToRealGLFunctionName(glFunctionName));
+  }
+
+  /**
+   * Returns true if the specified OpenGL extension can be
+   * successfully called using this GL context given the current host (OpenGL
+   * <i>client</i>) and display (OpenGL <i>server</i>) configuration.
+   *
+   * See {@link GL#isExtensionAvailable(String)} for more details.
+   *
+   * @param glExtensionName the name of the OpenGL extension (e.g.,
+   * "GL_VERTEX_PROGRAM_ARB").
+   */
+  public boolean isExtensionAvailable(String glExtensionName) {
+    return functionAvailability.isExtensionAvailable(mapToRealGLExtensionName(glExtensionName));
+  }
+  
+  /**
+   * Pbuffer support; indicates whether this context is capable of
+   * creating a subordinate pbuffer context (distinct from an
+   * "offscreen context", which is typically software-rendered on all
+   * platforms).
+   */
+  public abstract boolean canCreatePbufferContext();
+
+  /**
+   * Pbuffer support; creates a subordinate GLContext for a pbuffer
+   * associated with this context.
+   */
+  public abstract GLContext createPbufferContext(GLCapabilities capabilities,
+                                                 int initialWidth,
+                                                 int initialHeight);
+
+  /**
+   * Pbuffer support; given that this is a GLContext associated with a
+   * pbuffer, binds this pbuffer to its texture target.
+   */
+  public abstract void bindPbufferToTexture();
+
+  /**
+   * Pbuffer support; given that this is a GLContext associated with a
+   * pbuffer, releases this pbuffer from its texture target.
+   */
+  public abstract void releasePbufferFromTexture();
+
+  /** Maps the given "platform-independent" function name to a real function
+      name. Currently this is only used to map "glAllocateMemoryNV" and
+      associated routines to wglAllocateMemoryNV / glXAllocateMemoryNV. */
+  protected abstract String mapToRealGLFunctionName(String glFunctionName);
+
+  /** Maps the given "platform-independent" extension name to a real
+      function name. Currently this is only used to map
+      "GL_ARB_pbuffer" and "GL_ARB_pixel_format" to "WGL_ARB_pbuffer"
+      and "WGL_ARB_pixel_format" (not yet mapped to X11). */
+  protected abstract String mapToRealGLExtensionName(String glExtensionName);
+
+  /** Create the GL for this context. */
+  protected abstract GL createGL();
+  
+  /** Hook indicating whether the concrete GLContext implementation is
+      offscreen and therefore whether we need to process resize
+      requests. */
+  protected abstract boolean isOffscreen();
+
+  /** Only called for offscreen contexts; returns the type of
+      BufferedImage required for reading this context's pixels. */
+  public abstract int getOffscreenContextBufferedImageType();
+
+  /** Only called for offscreen contexts; returns the buffer from
+      which to read pixels (GL.GL_FRONT or GL.GL_BACK). */
+  public abstract int getOffscreenContextReadBuffer();
+
+  /** On some platforms the mismatch between OpenGL's coordinate
+      system (origin at bottom left) and the window system's
+      coordinate system (origin at top left) necessitates a vertical
+      flip of pixels read from offscreen contexts. */
+  public abstract boolean offscreenImageNeedsVerticalFlip();
+
+  /** Attempts to make the GL context current. If necessary, creates a
+      context and calls the initAction once the context is current.
+      Most error conditions cause an exception to be thrown, except
+      for the case where the context can not be created because the
+      component has not yet been visualized. In this case makeCurrent
+      returns false and the caller should abort any OpenGL event
+      processing and instead return immediately.  */
+  protected abstract boolean makeCurrent(Runnable initAction) throws GLException;
+
+  /** Frees the OpenGL context. All error conditions cause a
+      GLException to be thrown. */
+  protected abstract void free() throws GLException;
+
+  /** Swaps the buffers of the OpenGL context if necessary. All error
+      conditions cause a GLException to be thrown. */
+  protected abstract void swapBuffers() throws GLException;
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+  private boolean realized() {
+    return ((component == null) || realized || component.isDisplayable());
+  }
+}