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

1 files changed, 710 insertions, 0 deletions

diff --git a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
new file mode 100644
index 000000000..4282e9985
--- /dev/null
+++ b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
@@ -0,0 +1,710 @@
+/*
+ * 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
+ * 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 javax.media.opengl.awt;
+
+import javax.media.opengl.*;
+import javax.media.nativewindow.*;
+import javax.media.nativewindow.awt.*;
+
+import com.sun.opengl.impl.*;
+
+import java.awt.Canvas;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.Container;
+import java.awt.Window;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.geom.*;
+import java.beans.*;
+import java.lang.reflect.*;
+import java.security.*;
+
+// FIXME: Subclasses need to call resetGLFunctionAvailability() on their
+// context whenever the displayChanged() function is called on our
+// GLEventListeners
+
+/** A heavyweight AWT component which provides OpenGL rendering
+    support. This is the primary implementation of {@link GLDrawable};
+    {@link GLJPanel} is provided for compatibility with Swing user
+    interfaces when adding a heavyweight doesn't work either because
+    of Z-ordering or LayoutManager problems. */
+
+public class GLCanvas extends Canvas implements AWTGLAutoDrawable {
+
+  private static final boolean DEBUG = Debug.debug("GLCanvas");
+
+  static private GLProfile defaultGLProfile = GLProfile.getDefault();
+  private GLProfile glProfile;
+  private GLDrawableHelper drawableHelper = new GLDrawableHelper();
+  private GraphicsConfiguration chosen;
+  private AWTGraphicsConfiguration awtConfig;
+  private GLDrawable drawable;
+  private GLContextImpl context;
+  private boolean autoSwapBufferMode = true;
+  private boolean sendReshape = false;
+  
+  // copy of the cstr args ..
+  private GLCapabilities capabilities;
+  private GLCapabilitiesChooser chooser;
+  private GLContext shareWith;
+  private GraphicsDevice device;
+
+  /** Creates a new GLCanvas component with a default set of OpenGL
+      capabilities, using the default OpenGL capabilities selection
+      mechanism, on the default screen device. */
+  public GLCanvas() {
+    this(null);
+  }
+
+  /** Creates a new GLCanvas component with the requested set of
+      OpenGL capabilities, using the default OpenGL capabilities
+      selection mechanism, on the default screen device. */
+  public GLCanvas(GLCapabilities capabilities) {
+    this(capabilities, null, null, null);
+  }
+
+  /** Creates a new GLCanvas component. The passed GLCapabilities
+      specifies the OpenGL capabilities for the component; if null, a
+      default set of capabilities is used. The GLCapabilitiesChooser
+      specifies the algorithm for selecting one of the available
+      GLCapabilities for the component; a DefaultGLCapabilitesChooser
+      is used if null is passed for this argument. The passed
+      GLContext specifies an OpenGL context with which to share
+      textures, display lists and other OpenGL state, and may be null
+      if sharing is not desired. See the note in the overview
+      documentation on <a
+      href="../../../overview-summary.html#SHARING">context
+      sharing</a>. The passed GraphicsDevice indicates the screen on
+      which to create the GLCanvas; the GLDrawableFactory uses the
+      default screen device of the local GraphicsEnvironment if null
+      is passed for this argument. */
+  public GLCanvas(GLCapabilities capabilities,
+                  GLCapabilitiesChooser chooser,
+                  GLContext shareWith,
+                  GraphicsDevice device) {
+    /*
+     * Workaround for Xinerama, always pass null so we can detect whether
+     * super.getGraphicsConfiguration() is returning the Canvas' GC (null),
+     * or an ancestor component's GC (non-null) in the overridden version
+     * below.
+     */
+    super();
+
+    if(null==capabilities) {
+        capabilities = new GLCapabilities(defaultGLProfile);
+    }
+    glProfile = capabilities.getGLProfile();
+
+    this.capabilities = capabilities;
+    this.chooser = chooser;
+    this.shareWith=shareWith;
+    this.device = device;
+  }
+
+  protected interface DestroyMethod {
+    public void destroyMethod();
+  }
+
+  protected final static Object  addClosingListener(Component c, final DestroyMethod d) {
+    WindowAdapter cl = null;
+    Window w = getWindow(c);
+    if(null!=w) {
+        cl = new WindowAdapter() {
+                public void windowClosing(WindowEvent e) {
+                  // we have to issue this call rigth away,
+                  // otherwise the window gets destroyed
+                  d.destroyMethod();
+                }
+            };
+        w.addWindowListener(cl);
+    }
+    return cl;
+  }
+
+  protected final static Window getWindow(Component c) {
+    while ( c!=null && ! ( c instanceof Window ) ) {
+        c = c.getParent();
+    }
+    return (Window)c;
+  }
+
+  /**
+   * Overridden to choose a GraphicsConfiguration on a parent container's
+   * GraphicsDevice because both devices
+   */
+  public GraphicsConfiguration getGraphicsConfiguration() {
+    /*
+     * Workaround for problems with Xinerama and java.awt.Component.checkGD
+     * when adding to a container on a different graphics device than the
+     * one that this Canvas is associated with.
+     * 
+     * GC will be null unless:
+     *   - A native peer has assigned it. This means we have a native
+     *     peer, and are already comitted to a graphics configuration.
+     *   - This canvas has been added to a component hierarchy and has
+     *     an ancestor with a non-null GC, but the native peer has not
+     *     yet been created. This means we can still choose the GC on
+     *     all platforms since the peer hasn't been created.
+     */
+    final GraphicsConfiguration gc = super.getGraphicsConfiguration();
+    /*
+     * chosen is only non-null on platforms where the GLDrawableFactory
+     * returns a non-null GraphicsConfiguration (in the GLCanvas
+     * constructor).
+     * 
+     * if gc is from this Canvas' native peer then it should equal chosen,
+     * otherwise it is from an ancestor component that this Canvas is being
+     * added to, and we go into this block.
+     */
+    if (gc != null && chosen != null && !chosen.equals(gc)) {
+      /*
+       * Check for compatibility with gc. If they differ by only the
+       * device then return a new GCconfig with the super-class' GDevice
+       * (and presumably the same visual ID in Xinerama).
+       * 
+       */
+      if (!chosen.getDevice().getIDstring().equals(gc.getDevice().getIDstring())) {
+        /*
+         * Here we select a GraphicsConfiguration on the alternate
+         * device that is presumably identical to the chosen
+         * configuration, but on the other device.
+         * 
+         * Should really check to ensure that we select a configuration
+         * with the same X visual ID for Xinerama screens, otherwise the
+         * GLDrawable may have the wrong visual ID (I don't think this
+         * ever gets updated). May need to add a method to
+         * X11GLDrawableFactory to do this in a platform specific
+         * manner.
+         * 
+         * However, on platforms where we can actually get into this
+         * block, both devices should have the same visual list, and the
+         * same configuration should be selected here.
+         */
+        AWTGraphicsConfiguration config = chooseGraphicsConfiguration((GLCapabilities)awtConfig.getRequestedCapabilities(), chooser, gc.getDevice());
+        final GraphicsConfiguration compatible = (null!=config)?config.getGraphicsConfiguration():null;
+        boolean equalCaps = config.getChosenCapabilities().equals(awtConfig.getChosenCapabilities());
+        if(DEBUG) {
+            Exception e = new Exception("Call Stack: "+Thread.currentThread().getName());
+            e.printStackTrace();
+            System.err.println("!!! Created Config (n): HAVE    GC "+chosen);
+            System.err.println("!!! Created Config (n): THIS    GC "+gc);
+            System.err.println("!!! Created Config (n): Choosen GC "+compatible);
+            System.err.println("!!! Created Config (n): HAVE    CF "+awtConfig);
+            System.err.println("!!! Created Config (n): Choosen CF "+config);
+            System.err.println("!!! Created Config (n): EQUALS CAPS "+equalCaps);
+        }
+
+        if (compatible != null) {
+          /*
+           * Save the new GC for equals test above, and to return to
+           * any outside callers of this method.
+           */
+          chosen = compatible;
+
+          awtConfig = config;
+
+          if( !equalCaps && GLAutoDrawable.SCREEN_CHANGE_ACTION_ENABLED ) {
+              dispose(true);
+          }
+        }
+      }
+
+      /*
+       * If a compatible GC was not found in the block above, this will
+       * return the GC that was selected in the constructor (and might
+       * cause an exception in Component.checkGD when adding to a
+       * container, but in this case that would be the desired behavior).
+       * 
+       */
+      return chosen;
+    } else if (gc == null) {
+      /*
+       * The GC is null, which means we have no native peer, and are not
+       * part of a (realized) component hierarchy. So we return the
+       * desired visual that was selected in the constructor (possibly
+       * null).
+       */
+      return chosen;
+    }
+
+    /*
+     * Otherwise we have not explicitly selected a GC in the constructor, so
+     * just return what Canvas would have.
+     */
+    return gc;
+  }
+  
+  public GLContext createContext(GLContext shareWith) {
+    return drawable.createContext(shareWith);
+  }
+
+  public void setRealized(boolean realized) {
+  }
+
+  private Object closingListener = null;
+  private Object closingListenerLock = new Object();
+
+  public void display() {
+    maybeDoSingleThreadedWorkaround(displayOnEventDispatchThreadAction,
+                                    displayAction);
+    if(null==closingListener) {
+      synchronized(closingListenerLock) {
+        if(null==closingListener) {
+            closingListener=addClosingListener(this, new DestroyMethod() { 
+                        public void destroyMethod() { destroy(); } });
+        }
+      }
+    }
+  }
+
+  protected void dispose(boolean regenerate) {
+    if(DEBUG) {
+        Exception ex1 = new Exception("dispose("+regenerate+") - start");
+        ex1.printStackTrace();
+    }
+    disposeRegenerate=regenerate;
+
+    if (Threading.isSingleThreaded() &&
+        !Threading.isOpenGLThread()) {
+      // Workaround for termination issues with applets --
+      // sun.applet.AppletPanel should probably be performing the
+      // remove() call on the EDT rather than on its own thread
+      if (ThreadingImpl.isAWTMode() &&
+          Thread.holdsLock(getTreeLock())) {
+        // The user really should not be invoking remove() from this
+        // thread -- but since he/she is, we can not go over to the
+        // EDT at this point. Try to destroy the context from here.
+        drawableHelper.invokeGL(drawable, context, disposeAction, null);
+      } else {
+        Threading.invokeOnOpenGLThread(disposeOnEventDispatchThreadAction);
+      }
+    } else {
+      drawableHelper.invokeGL(drawable, context, disposeAction, null);
+    }
+
+    if(DEBUG) {
+        System.err.println("dispose("+regenerate+") - stop");
+    }
+  }
+
+  /**
+   * Just an alias for removeNotify
+   */
+  public void destroy() {
+    removeNotify();
+  }
+
+  /** Overridden to cause OpenGL rendering to be performed during
+      repaint cycles. Subclasses which override this method must call
+      super.paint() in their paint() method in order to function
+      properly. <P>
+
+      <B>Overrides:</B>
+      <DL><DD><CODE>paint</CODE> in class <CODE>java.awt.Component</CODE></DD></DL> */
+  public void paint(Graphics g) {
+    if (Beans.isDesignTime()) {
+      // Make GLCanvas behave better in NetBeans GUI builder
+      g.setColor(Color.BLACK);
+      g.fillRect(0, 0, getWidth(), getHeight());
+      FontMetrics fm = g.getFontMetrics();
+      String name = getName();
+      if (name == null) {
+        name = getClass().getName();
+        int idx = name.lastIndexOf('.');
+        if (idx >= 0) {
+          name = name.substring(idx + 1);
+        }
+      }
+      Rectangle2D bounds = fm.getStringBounds(name, g);
+      g.setColor(Color.WHITE);
+      g.drawString(name,
+                   (int) ((getWidth()  - bounds.getWidth())  / 2),
+                   (int) ((getHeight() + bounds.getHeight()) / 2));
+      return;
+    }
+
+    display();
+  }
+
+  /** Overridden to track when this component is added to a container.
+      Subclasses which override this method must call
+      super.addNotify() in their addNotify() method in order to
+      function properly. <P>
+
+      <B>Overrides:</B>
+      <DL><DD><CODE>addNotify</CODE> in class <CODE>java.awt.Component</CODE></DD></DL> */
+  public void addNotify() {
+    super.addNotify();
+    if (!Beans.isDesignTime()) {
+        disableBackgroundErase();
+
+        if(null==device) {
+            GraphicsConfiguration gc = super.getGraphicsConfiguration();
+            if(null!=gc) {
+                device = gc.getDevice();
+            }
+        }
+
+        /*
+         * Save the chosen capabilities for use in getGraphicsConfiguration().
+         */
+        awtConfig = chooseGraphicsConfiguration(capabilities, chooser, device);
+        if(DEBUG) {
+            Exception e = new Exception("Created Config: "+awtConfig);
+            e.printStackTrace();
+        }
+        if(null!=awtConfig) {
+          // update ..
+          chosen = awtConfig.getGraphicsConfiguration();
+
+        }
+        if(null==awtConfig) {
+          throw new GLException("Error: AWTGraphicsConfiguration is null");
+        }
+        drawable = GLDrawableFactory.getFactory(glProfile).createGLDrawable(NativeWindowFactory.getNativeWindow(this, awtConfig));
+        context = (GLContextImpl) drawable.createContext(shareWith);
+        context.setSynchronized(true);
+
+        if(DEBUG) {
+            System.err.println("Created Drawable: "+drawable);
+        }
+        drawable.setRealized(true);
+    }
+  }
+
+  /** Overridden to track when this component is removed from a
+      container. Subclasses which override this method must call
+      super.removeNotify() in their removeNotify() method in order to
+      function properly. <P>
+
+      <B>Overrides:</B>
+      <DL><DD><CODE>removeNotify</CODE> in class <CODE>java.awt.Component</CODE></DD></DL> */
+  public void removeNotify() {
+    if(DEBUG) {
+        Exception ex1 = new Exception("removeNotify - start");
+        ex1.printStackTrace();
+    }
+
+    if (Beans.isDesignTime()) {
+      super.removeNotify();
+    } else {
+      try {
+        dispose(false);
+      } finally {
+        drawable=null;
+        super.removeNotify();
+      }
+    }
+    if(DEBUG) {
+        System.out.println("removeNotify - end");
+    }
+  }
+
+  /** Overridden to cause {@link GLDrawableHelper#reshape} to be
+      called on all registered {@link GLEventListener}s. Subclasses
+      which override this method must call super.reshape() in
+      their reshape() method in order to function properly. <P>
+
+      <B>Overrides:</B>
+      <DL><DD><CODE>reshape</CODE> in class <CODE>java.awt.Component</CODE></DD></DL> */
+  public void reshape(int x, int y, int width, int height) {
+    super.reshape(x, y, width, height);
+    sendReshape = true;
+  }
+
+  /** <B>Overrides:</B>
+      <DL><DD><CODE>update</CODE> in class <CODE>java.awt.Component</CODE></DD></DL> */
+  // Overridden from Canvas to prevent the AWT's clearing of the
+  // canvas from interfering with the OpenGL rendering.
+  public void update(Graphics g) {
+    paint(g);
+  }
+  
+  public void addGLEventListener(GLEventListener listener) {
+    drawableHelper.addGLEventListener(listener);
+  }
+
+  public void removeGLEventListener(GLEventListener listener) {
+    drawableHelper.removeGLEventListener(listener);
+  }
+
+  public void setContext(GLContext ctx) {
+    context=(GLContextImpl)ctx;
+  }
+
+  public GLContext getContext() {
+    return context;
+  }
+
+  public GL getGL() {
+    if (Beans.isDesignTime()) {
+      return null;
+    }
+    GLContext context = getContext();
+    return (context == null) ? null : context.getGL();
+  }
+
+  public void setGL(GL gl) {
+    GLContext context = getContext();
+    if (context != null) {
+      context.setGL(gl);
+    }
+  }
+
+
+  public void setAutoSwapBufferMode(boolean onOrOff) {
+    drawableHelper.setAutoSwapBufferMode(onOrOff);
+  }
+
+  public boolean getAutoSwapBufferMode() {
+    return drawableHelper.getAutoSwapBufferMode();
+  }
+
+  public void swapBuffers() {
+    maybeDoSingleThreadedWorkaround(swapBuffersOnEventDispatchThreadAction, swapBuffersAction);
+  }
+
+  public GLProfile getGLProfile() {
+    return glProfile;
+  }
+
+  public GLCapabilities getChosenGLCapabilities() {
+    if (awtConfig == null) {
+        throw new GLException("No AWTGraphicsConfiguration: "+this);
+    }
+
+    return (GLCapabilities)awtConfig.getChosenCapabilities();
+  }
+
+  public GLCapabilities getRequestedGLCapabilities() {
+    if (awtConfig == null) {
+        throw new GLException("No AWTGraphicsConfiguration: "+this);
+    }
+
+    return (GLCapabilities)awtConfig.getRequestedCapabilities();
+  }
+
+  public NativeWindow getNativeWindow() {
+    return drawable.getNativeWindow();
+  }
+
+  public GLDrawableFactory getFactory() {
+    return drawable.getFactory();
+  }
+
+  public String toString() {
+    return "AWT-GLCanvas[ "+awtConfig+", "+((null!=drawable)?drawable.getClass().getName():"null-drawable")+", "+drawableHelper+"]";
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private void maybeDoSingleThreadedWorkaround(Runnable eventDispatchThreadAction,
+                                               Runnable invokeGLAction) {
+    if (Threading.isSingleThreaded() &&
+        !Threading.isOpenGLThread()) {
+      Threading.invokeOnOpenGLThread(eventDispatchThreadAction);
+    } else {
+      drawableHelper.invokeGL(drawable, context, invokeGLAction, initAction);
+    }
+  }
+
+  private boolean disposeRegenerate;
+  private DisposeAction disposeAction = new DisposeAction(this);
+
+  class DisposeAction implements Runnable {
+    private GLCanvas canvas;
+    public DisposeAction(GLCanvas canvas) {
+        this.canvas = canvas;
+    }
+    public void run() {
+      drawableHelper.dispose(GLCanvas.this);
+
+      if(null!=context) {
+        context.makeCurrent(); // implicit wait for lock ..
+        context.destroy();
+        context=null;
+      }
+
+      if(null!=drawable) {
+          drawable.setRealized(false);
+      }
+
+      if(disposeRegenerate) {
+          // recreate GLDrawable to reflect it's new graphics configuration
+          drawable = GLDrawableFactory.getFactory(glProfile).createGLDrawable(NativeWindowFactory.getNativeWindow(canvas, awtConfig));
+          if(DEBUG) {
+            System.err.println("GLCanvas.dispose(true): new drawable: "+drawable);
+          }
+          drawable.setRealized(true);
+          context = (GLContextImpl) drawable.createContext(shareWith);
+          context.setSynchronized(true);
+          sendReshape=true; // ensure a reshape is being send ..
+      }
+    }
+  }
+
+  private DisposeOnEventDispatchThreadAction disposeOnEventDispatchThreadAction =
+    new DisposeOnEventDispatchThreadAction();
+
+  class DisposeOnEventDispatchThreadAction implements Runnable {
+    public void run() {
+      drawableHelper.invokeGL(drawable, context, disposeAction, null);
+    }
+  }
+
+  class InitAction implements Runnable {
+    public void run() {
+      drawableHelper.init(GLCanvas.this);
+    }
+  }
+  private InitAction initAction = new InitAction();
+  
+  class DisplayAction implements Runnable {
+    public void run() {
+      if (sendReshape) {
+        // Note: we ignore the given x and y within the parent component
+        // since we are drawing directly into this heavyweight component.
+        int width = getWidth();
+        int height = getHeight();
+        getGL().glViewport(0, 0, width, height);
+        drawableHelper.reshape(GLCanvas.this, 0, 0, width, height);
+        sendReshape = false;
+      }
+
+      drawableHelper.display(GLCanvas.this);
+    }
+  }
+  private DisplayAction displayAction = new DisplayAction();
+
+  class SwapBuffersAction implements Runnable {
+    public void run() {
+      drawable.swapBuffers();
+    }
+  }
+  private SwapBuffersAction swapBuffersAction = new SwapBuffersAction();
+
+  // Workaround for ATI driver bugs related to multithreading issues
+  // like simultaneous rendering via Animators to canvases that are
+  // being resized on the AWT event dispatch thread
+  class DisplayOnEventDispatchThreadAction implements Runnable {
+    public void run() {
+      drawableHelper.invokeGL(drawable, context, displayAction, initAction);
+    }
+  }
+  private DisplayOnEventDispatchThreadAction displayOnEventDispatchThreadAction =
+    new DisplayOnEventDispatchThreadAction();
+  class SwapBuffersOnEventDispatchThreadAction implements Runnable {
+    public void run() {
+      drawableHelper.invokeGL(drawable, context, swapBuffersAction, initAction);
+    }
+  }
+  private SwapBuffersOnEventDispatchThreadAction swapBuffersOnEventDispatchThreadAction =
+    new SwapBuffersOnEventDispatchThreadAction();
+
+  // Disables the AWT's erasing of this Canvas's background on Windows
+  // in Java SE 6. This internal API is not available in previous
+  // releases, but the system property
+  // -Dsun.awt.noerasebackground=true can be specified to get similar
+  // results globally in previous releases.
+  private static boolean disableBackgroundEraseInitialized;
+  private static Method  disableBackgroundEraseMethod;
+  private void disableBackgroundErase() {
+    if (!disableBackgroundEraseInitialized) {
+      try {
+        AccessController.doPrivileged(new PrivilegedAction() {
+            public Object run() {
+              try {
+                Class clazz = getToolkit().getClass();
+                while (clazz != null && disableBackgroundEraseMethod == null) {
+                  try {
+                    disableBackgroundEraseMethod =
+                      clazz.getDeclaredMethod("disableBackgroundErase",
+                                              new Class[] { Canvas.class });
+                    disableBackgroundEraseMethod.setAccessible(true);
+                  } catch (Exception e) {
+                    clazz = clazz.getSuperclass();
+                  }
+                }
+              } catch (Exception e) {
+              }
+              return null;
+            }
+          });
+      } catch (Exception e) {
+      }
+      disableBackgroundEraseInitialized = true;
+    }
+    if (disableBackgroundEraseMethod != null) {
+      try {
+        disableBackgroundEraseMethod.invoke(getToolkit(), new Object[] { this });
+      } catch (Exception e) {
+        // FIXME: workaround for 6504460 (incorrect backport of 6333613 in 5.0u10)
+        // throw new GLException(e);
+      }
+    }
+  }
+
+  private static AWTGraphicsConfiguration chooseGraphicsConfiguration(GLCapabilities capabilities,
+                                                                      GLCapabilitiesChooser chooser,
+                                                                      GraphicsDevice device) {
+    // Make GLCanvas behave better in NetBeans GUI builder
+    if (Beans.isDesignTime()) {
+      return null;
+    }
+
+    AbstractGraphicsScreen aScreen = AWTGraphicsScreen.createScreenDevice(device);
+    AWTGraphicsConfiguration config = (AWTGraphicsConfiguration)
+      GraphicsConfigurationFactory.getFactory(AWTGraphicsDevice.class).chooseGraphicsConfiguration(capabilities,
+                                                                                                   chooser,
+                                                                                                   aScreen);
+    if (config == null) {
+      throw new GLException("Error: Couldn't fetch AWTGraphicsConfiguration");
+    }
+
+    return config;
+  }
+}