OS X Layered View Part8: Generalize OffscreenLayerSurface ; Use local JAWT instance ; Applet's on OS X are working

Generalize OffscreenLayerSurface
  - Using new OffscreenLayerSurface allows using this functionality in a clean manner,
    ie. no 'dirty' usage of MacOSXJAWTWindow in a JOGL GL class.

  - 'Promoting' OffscreenLayerSurface functionality to JAWTWindow
    and it's handling to GLDrawableFactoryImpl::createGLDrawable().

  - Move MacOSXCGLDrawableFactory's "MacOSXJAWTWindow getLayeredSurfaceHost(NativeSurface surface)"
    to NativeWindowFactory "OffscreenLayerSurface getOffscreenLayerSurface(NativeSurface surface, boolean ifEnabled)"

Use local JAWT instance
  - Only w/ a local JAWT instance per JAWTWindow it is possible to switch between
    offscreen-layer and onscreen. We also have to determing offscreen-layer lazy
    at surface lock, since only at that time we have knowledge whether it's an Applet
    or not.

+++

ContextUpdater:
  Use local pthread mutex, add DEBUG output

JAWTWindow/NewtCanvasAWT:
  Adding methods to request offscreen-layer-surface (if supported),
  besides 'if applet' this may trigger the new functionality.

+++

Applet's on OS X are working:
  - OS X 10.6.4
    - Safari:
      - Hangs for a while at start .. whole screen freezes .. approx. 10s
      - Sometimes crashes when Applet stops - after all our resources are released!
      - Keyboard input isn't assigned sometimes.
      - Otherwise .. works well, incl. offscreen/onscreen parenting

    - Firefox 8.0:
      - Hangs for a while at start .. whole screen freezes .. approx. 10s
      - Sometimes crashes when Applet stops - after all our resources are released!
      - Keyboard input is never assigned.
      - Otherwise .. works well, incl. offscreen/onscreen parenting

  - OS X 10.7
    - Safari:
      - Sometimes crashes when Applet stops - after all our resources are released!
      - Keyboard input isn't assigned sometimes.
      - Otherwise .. works well, incl. offscreen/onscreen parenting

    - Firefox 8.0:
      - Sometimes crashes when Applet stops - after all our resources are released!
      - Keyboard input is never assigned.
      - Otherwise .. works well, incl. offscreen/onscreen parenting

21 files changed, 539 insertions, 307 deletions

diff --git a/src/jogl/classes/jogamp/opengl/GLDrawableFactoryImpl.java b/src/jogl/classes/jogamp/opengl/GLDrawableFactoryImpl.java
index 704f71457..4f0b11789 100644
--- a/src/jogl/classes/jogamp/opengl/GLDrawableFactoryImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLDrawableFactoryImpl.java
@@ -40,9 +40,26 @@
 
 package jogamp.opengl;
 
-import java.nio.*;
-import javax.media.nativewindow.*;
-import javax.media.opengl.*;
+import java.nio.Buffer;
+
+import javax.media.nativewindow.AbstractGraphicsDevice;
+import javax.media.nativewindow.NativeSurface;
+import javax.media.nativewindow.NativeWindowFactory;
+import javax.media.nativewindow.OffscreenLayerSurface;
+import javax.media.nativewindow.ProxySurface;
+import javax.media.nativewindow.SurfaceChangeable;
+import javax.media.opengl.GLCapabilities;
+import javax.media.opengl.GLCapabilitiesChooser;
+import javax.media.opengl.GLCapabilitiesImmutable;
+import javax.media.opengl.GLContext;
+import javax.media.opengl.GLDrawable;
+import javax.media.opengl.GLDrawableFactory;
+import javax.media.opengl.GLException;
+import javax.media.opengl.GLPbuffer;
+import javax.media.opengl.GLProfile;
+import javax.media.opengl.Threading;
+
+import jogamp.nativewindow.MutableGraphicsConfiguration;
 
 import com.jogamp.common.util.VersionNumber;
 
@@ -103,24 +120,43 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
     if (target == null) {
       throw new IllegalArgumentException("Null target");
     }
-    AbstractGraphicsConfiguration config = target.getGraphicsConfiguration().getNativeGraphicsConfiguration();
-    GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) config.getChosenCapabilities();
+    final MutableGraphicsConfiguration config = (MutableGraphicsConfiguration) target.getGraphicsConfiguration().getNativeGraphicsConfiguration();
+    GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable) config.getChosenCapabilities();
     AbstractGraphicsDevice adevice = config.getScreen().getDevice();
     GLDrawable result = null;
     adevice.lock();
     try {
-        if(caps.isOnscreen()) {
-            if(DEBUG) {
-                System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OnscreenDrawable: "+target);
+        if(chosenCaps.isOnscreen()) {
+            // onscreen
+            final OffscreenLayerSurface ols = NativeWindowFactory.getOffscreenLayerSurface(target, true);
+            if(null == ols) {
+                // traditional onscreen
+                if(DEBUG) {
+                    System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OnscreenDrawable: "+target);
+                }
+                result = createOnscreenDrawableImpl(target);
+            } else {            
+                // layered surface -> offscreen/PBuffer
+                final GLCapabilities chosenCapsMod = (GLCapabilities) chosenCaps.cloneMutable();
+                chosenCapsMod.setOnscreen(false);
+                chosenCapsMod.setPBuffer(canCreateGLPbuffer(adevice));
+                config.setChosenCapabilities(chosenCapsMod);
+                if(DEBUG) {
+                    System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OnscreenDrawable -> Offscreen-Layer: "+target);
+                }
+                if( ! ( target instanceof SurfaceChangeable ) ) {
+                    throw new IllegalArgumentException("Passed NativeSurface must implement SurfaceChangeable for offscreen layered surface: "+target);
+                }
+                result = createOffscreenDrawableImpl(target);
             }
-            result = createOnscreenDrawableImpl(target);
         } else {
+            // offscreen
+            if(DEBUG) {
+                System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OffScreenDrawable (PBuffer: "+chosenCaps.isPBuffer()+"): "+target);
+            }
             if( ! ( target instanceof SurfaceChangeable ) ) {
                 throw new IllegalArgumentException("Passed NativeSurface must implement SurfaceChangeable for offscreen: "+target);
             }
-            if(DEBUG) {
-                System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OffScreenDrawable (PBuffer: "+caps.isPBuffer()+"): "+target);
-            }
             result = createOffscreenDrawableImpl(target);
         }
     } finally {
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
index b75d2f927..f5970fad9 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
@@ -46,18 +46,18 @@ import java.util.Map;
 import javax.media.nativewindow.AbstractGraphicsConfiguration;
 import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.NativeSurface;
+import javax.media.nativewindow.NativeWindowFactory;
+import javax.media.nativewindow.OffscreenLayerSurface;
 import javax.media.opengl.GLCapabilitiesImmutable;
 import javax.media.opengl.GLContext;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
-import jogamp.nativewindow.jawt.macosx.MacOSXJAWTWindow;
 import jogamp.opengl.GLContextImpl;
 import jogamp.opengl.GLContextShareSet;
 import jogamp.opengl.GLDrawableImpl;
 import jogamp.opengl.GLGraphicsConfigurationUtil;
 import jogamp.opengl.macosx.cgl.MacOSXCGLDrawable.GLBackendType;
-import jogamp.opengl.macosx.cgl.MacOSXCGLDrawable.LayeredSurfaceType;
 
 import com.jogamp.common.nio.PointerBuffer;
 import com.jogamp.common.os.Platform;
@@ -407,7 +407,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
         final MacOSXCGLDrawable drawable = (MacOSXCGLDrawable) MacOSXCGLContext.this.drawable;
         final NativeSurface surface = drawable.getNativeSurface();
         final MacOSXCGLGraphicsConfiguration config = (MacOSXCGLGraphicsConfiguration) surface.getGraphicsConfiguration().getNativeGraphicsConfiguration();
-        final boolean isBackingLayerView = LayeredSurfaceType.None != drawable.getLayeredSurfaceType();
+        final OffscreenLayerSurface backingLayerHost = NativeWindowFactory.getOffscreenLayerSurface(surface, true);        
         final GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable) config.getChosenCapabilities();
         long pixelFormat = MacOSXCGLGraphicsConfiguration.GLCapabilities2NSPixelFormat(chosenCaps, ctp, major, minor);
         if (pixelFormat == 0) {
@@ -416,7 +416,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
         config.setChosenPixelFormat(pixelFormat);
         if(DEBUG) {
             System.err.println("NS create OSX>=lion "+isLionOrLater);
-            System.err.println("NS create drawable layeredType: "+drawable.getLayeredSurfaceType()+", backingLayerView "+isBackingLayerView);
+            System.err.println("NS create backingLayerHost: "+backingLayerHost);
             System.err.println("NS create share: "+share);
             System.err.println("NS create chosenCaps: "+chosenCaps);
             System.err.println("NS create pixelFormat: "+toHexString(pixelFormat));
@@ -428,7 +428,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
           int[] viewNotReady = new int[1];
           // Try to allocate a context with this
           ctx = CGL.createContext(share,
-                                  drawable.getNSViewHandle(), isBackingLayerView,
+                                  drawable.getNSViewHandle(), null!=backingLayerHost,
                                   pixelFormat,
                                   chosenCaps.isBackgroundOpaque(),
                                   viewNotReady, 0);
@@ -459,16 +459,11 @@ public abstract class MacOSXCGLContext extends GLContextImpl
               CGL.setContextPBuffer(ctx, drawable.getHandle());
           }
           //
-          // handled layered surface (same path for direct and parented)
+          // handled layered surface
           // 
-          if(isBackingLayerView) {
-              final MacOSXJAWTWindow lsh = MacOSXCGLDrawableFactory.getLayeredSurfaceHost(surface);
+          if(null != backingLayerHost) {
               nsOpenGLLayerPFmt = pixelFormat;
               pixelFormat = 0;
-              /*
-                final long nsView = drawable.getNSViewHandle();
-                nsOpenGLLayer = CGL.createNSOpenGLLayer(ctx, nsOpenGLLayerPFmt, nsView, fixedCaps.isBackgroundOpaque());
-               */
               final int texWidth, texHeight;
               if(drawable instanceof MacOSXPbufferCGLDrawable) {
                   final MacOSXPbufferCGLDrawable osxPDrawable = (MacOSXPbufferCGLDrawable)drawable;
@@ -482,7 +477,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
               if (DEBUG) {
                   System.err.println("NS create nsOpenGLLayer "+toHexString(nsOpenGLLayer));
               }              
-              lsh.attachSurfaceLayer(nsOpenGLLayer);
+              backingLayerHost.attachSurfaceLayer(nsOpenGLLayer);
           }
         } finally {
           if(0!=pixelFormat) {
@@ -495,12 +490,15 @@ public abstract class MacOSXCGLContext extends GLContextImpl
     public boolean destroy(long ctx) {
       if(0 != nsOpenGLLayer) {
           final NativeSurface surface = drawable.getNativeSurface();
-          final MacOSXJAWTWindow lsh = MacOSXCGLDrawableFactory.getLayeredSurfaceHost(surface);
           if (DEBUG) {
               System.err.println("NS destroy nsOpenGLLayer "+toHexString(nsOpenGLLayer));
           }
+          final OffscreenLayerSurface ols = NativeWindowFactory.getOffscreenLayerSurface(surface, true);
+          if(null == ols) {
+              throw new InternalError("XXX: "+ols);
+          }
           CGL.releaseNSOpenGLLayer(nsOpenGLLayer);
-          lsh.detachSurfaceLayer(nsOpenGLLayer);
+          ols.detachSurfaceLayer(nsOpenGLLayer);
           CGL.deletePixelFormat(nsOpenGLLayerPFmt);
           nsOpenGLLayerPFmt = 0;
           nsOpenGLLayer = 0;
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawable.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawable.java
index 7ee0d4fbe..12d480fd1 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawable.java
@@ -49,7 +49,6 @@ import javax.media.nativewindow.NativeSurface;
 import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 
-import jogamp.nativewindow.jawt.macosx.MacOSXJAWTWindow;
 import jogamp.opengl.GLDrawableImpl;
 import jogamp.opengl.GLDynamicLookupHelper;
 
@@ -93,29 +92,16 @@ public abstract class MacOSXCGLDrawable extends GLDrawableImpl {
         this.id = id;
     }
   }
-  public enum LayeredSurfaceType {
-    None(0), Direct(1), Parented(2); 
-    
-    public final int id;
-
-    LayeredSurfaceType(int id){
-        this.id = id;
-    }
-  }
-
   private List<WeakReference<MacOSXCGLContext>> createdContexts = new ArrayList<WeakReference<MacOSXCGLContext>>();
   
   private boolean haveSetOpenGLMode = false;
   private GLBackendType openGLMode = GLBackendType.NSOPENGL;
-  protected LayeredSurfaceType layeredSurfaceType = LayeredSurfaceType.None;
   
   public MacOSXCGLDrawable(GLDrawableFactory factory, NativeSurface comp, boolean realized) {
     super(factory, comp, realized);
     initOpenGLImpl(getOpenGLMode());
   }
   
-  public final LayeredSurfaceType getLayeredSurfaceType() { return layeredSurfaceType; }
-
   protected void setRealizedImpl() {
   }
 
@@ -123,32 +109,6 @@ public abstract class MacOSXCGLDrawable extends GLDrawableImpl {
       return GLBackendType.NSOPENGL == openGLMode ? getHandle() : null;
   }
   
-  @Override
-  protected void updateHandle() {
-    final MacOSXJAWTWindow lsh = MacOSXCGLDrawableFactory.getLayeredSurfaceHost(surface);
-    if (null != lsh) {
-      if(lsh == surface) {
-          // direct surface host, eg. AWT GLCanvas
-          layeredSurfaceType = LayeredSurfaceType.Direct;
-          if (DEBUG) {
-              System.err.println("updateHandle: layerType " + layeredSurfaceType + ", backingLayer "+toHexString(lsh.getSurfaceHandle()));
-          }
-      } else {
-          // parent surface host, eg. via native parenting w/ NewtCanvasAWT
-          layeredSurfaceType = LayeredSurfaceType.Parented;
-          if (DEBUG) {
-              System.err.println("updateHandle: layerType " + layeredSurfaceType + ", backingLayer "+toHexString(getHandle()));
-          }
-      }
-    } else {
-      layeredSurfaceType = LayeredSurfaceType.None;
-      if (DEBUG) {
-          System.err.println("updateHandle: layerType " + layeredSurfaceType);
-      }
-    }
-    super.updateHandle();
-  }
-  
   protected void registerContext(MacOSXCGLContext ctx) {
     // NOTE: we need to keep track of the created contexts in order to
     // implement swapBuffers() because of how Mac OS X implements its
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
index 3c2b7aed6..30917476e 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
@@ -50,7 +50,6 @@ import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.AbstractGraphicsScreen;
 import javax.media.nativewindow.DefaultGraphicsScreen;
 import javax.media.nativewindow.NativeSurface;
-import javax.media.nativewindow.NativeWindow;
 import javax.media.nativewindow.NativeWindowFactory;
 import javax.media.nativewindow.ProxySurface;
 import javax.media.nativewindow.macosx.MacOSXGraphicsDevice;
@@ -64,7 +63,6 @@ import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
 import jogamp.nativewindow.WrappedSurface;
-import jogamp.nativewindow.jawt.macosx.MacOSXJAWTWindow;
 import jogamp.opengl.DesktopGLDynamicLookupHelper;
 import jogamp.opengl.GLDrawableFactoryImpl;
 import jogamp.opengl.GLDrawableImpl;
@@ -259,38 +257,10 @@ public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
       return MacOSXCGLGraphicsConfiguration.getAvailableCapabilities(this, device);
   }
 
-  protected static MacOSXJAWTWindow getLayeredSurfaceHost(NativeSurface surface) {
-      if(surface instanceof NativeWindow) {
-          final NativeWindow nwThis = (NativeWindow) surface;
-          if( nwThis instanceof MacOSXJAWTWindow) {
-              // direct surface host, eg. via AWT GLCanvas
-              final MacOSXJAWTWindow r = (MacOSXJAWTWindow) nwThis;
-              return r.isOffscreenLayerSurface() ? r : null;
-          } else {
-              NativeWindow nwParent = nwThis.getParent();
-              if(null != nwParent && nwParent instanceof MacOSXJAWTWindow) {
-                  final MacOSXJAWTWindow r = (MacOSXJAWTWindow) nwParent;
-                  return r.isOffscreenLayerSurface() ? r : null;
-              }
-          }
-      }
-      return null;      
-  }
-      
   protected GLDrawableImpl createOnscreenDrawableImpl(NativeSurface target) {
     if (target == null) {
       throw new IllegalArgumentException("Null target");
     }
-    final MacOSXJAWTWindow lsh = MacOSXCGLDrawableFactory.getLayeredSurfaceHost(target);
-    if(null != lsh) {
-        // layered surface -> PBuffer
-        final MacOSXCGLGraphicsConfiguration config = (MacOSXCGLGraphicsConfiguration) target.getGraphicsConfiguration().getNativeGraphicsConfiguration();
-        final GLCapabilities chosenCaps = (GLCapabilities) config.getChosenCapabilities().cloneMutable();
-        chosenCaps.setOnscreen(false);
-        chosenCaps.setPBuffer(true);
-        config.setChosenCapabilities(chosenCaps);
-        return new MacOSXPbufferCGLDrawable(this, target, false);
-    }
     return new MacOSXOnscreenCGLDrawable(this, target);
   }
 
@@ -300,21 +270,6 @@ public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
     if(!caps.isPBuffer()) {
         return new MacOSXOffscreenCGLDrawable(this, target);
     }
-
-    // PBuffer GLDrawable Creation
-    /**
-     * FIXME: Think about this ..
-     * should not be necessary ? ..
-    final List returnList = new ArrayList();
-    final GLDrawableFactory factory = this;
-    Runnable r = new Runnable() {
-        public void run() {
-          returnList.add(new MacOSXPbufferCGLDrawable(factory, target));
-        }
-      };
-    maybeDoSingleThreadedWorkaround(r);
-    return (GLDrawableImpl) returnList.get(0);
-    */
     return new MacOSXPbufferCGLDrawable(this, target, true);
   }
 
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXOnscreenCGLContext.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXOnscreenCGLContext.java
index de3e90c4c..4fe6fa484 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXOnscreenCGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXOnscreenCGLContext.java
@@ -74,6 +74,8 @@ public class MacOSXOnscreenCGLContext extends MacOSXCGLContext {
   @Override
   protected boolean createImpl() {
     boolean res = super.createImpl();
+    lastWidth = -1; 
+    lastHeight = -1;    
     if(res && isNSContext()) {
         if(0 != updateHandle) {
             throw new InternalError("XXX1");
@@ -83,9 +85,6 @@ public class MacOSXOnscreenCGLContext extends MacOSXCGLContext {
             throw new InternalError("XXX2");
         }
     }
-    updateHandle = 0;
-    lastWidth = -1; 
-    lastHeight = -1;    
     return res;
   }
 
@@ -98,6 +97,6 @@ public class MacOSXOnscreenCGLContext extends MacOSXCGLContext {
     super.destroyImpl();    
   }
   
-  private long updateHandle;
+  private long updateHandle = 0;
   private int lastWidth, lastHeight;
 }
diff --git a/src/jogl/native/macosx/ContextUpdater.h b/src/jogl/native/macosx/ContextUpdater.h
index 3cf7315af..f00b2be57 100644
--- a/src/jogl/native/macosx/ContextUpdater.h
+++ b/src/jogl/native/macosx/ContextUpdater.h
@@ -25,17 +25,13 @@ This notification is sent whenever an NSView that has an attached NSSurface chan
 @interface ContextUpdater : NSObject
 {
 @protected
+    pthread_mutex_t resourceLock;
     NSView * view;
     NSRect viewRect;
     NSOpenGLContext *ctx;
     BOOL viewUpdated;
 }
 
-- (void) lock;
-- (void) lockInFunction:(char *)func atLine:(int)line;
-- (void) unlock;
-- (void) unlockInFunction:(char *)func atLine:(int)line;
-
 - (id) initWithContext:(NSOpenGLContext *)context view: (NSView *)nsView;
 
 - (void) update:(NSNotification *)notification;
diff --git a/src/jogl/native/macosx/ContextUpdater.m b/src/jogl/native/macosx/ContextUpdater.m
index e0668352c..a3b9b5c8c 100644
--- a/src/jogl/native/macosx/ContextUpdater.m
+++ b/src/jogl/native/macosx/ContextUpdater.m
@@ -1,43 +1,26 @@
 #import "ContextUpdater.h"
 #import <pthread.h>
 
-@implementation ContextUpdater
-{
-}
+#define VERBOSE_ON 1
 
-static pthread_mutex_t resourceLock = PTHREAD_MUTEX_INITIALIZER;
+#ifdef VERBOSE_ON
+    #define DBG_PRINT(...) NSLog(@ __VA_ARGS__)
+    // #define DBG_PRINT(...) fprintf(stderr, __VA_ARGS__); fflush(stderr)
+#else
+    #define DBG_PRINT(...)
+#endif
 
-static void printLockDebugInfo(char *message, char *func, int line)
-{
-    fprintf(stderr, "%s in function: \"%s\" at line: %d\n", message, func, line);
-    fflush(NULL);
-}
+#ifndef CGL_VERSION_1_3
+    #warning this SDK doesn't support OpenGL profile
+#endif
 
-- (void) lock
-{
-    pthread_mutex_lock(&resourceLock);
-}
-
-- (void) lockInFunction:(char *)func atLine:(int)line
-{
-    printLockDebugInfo("locked  ", func, line);
-    [self lock];
-}
-
-- (void) unlock
-{
-    pthread_mutex_unlock(&resourceLock);
-}
-
-- (void) unlockInFunction:(char *)func atLine:(int)line
+@implementation ContextUpdater
 {
-    printLockDebugInfo("unlocked", func, line);
-    [self unlock];
 }
 
 - (void) update:(NSNotification *)notification
 {
-    [self lock];
+    pthread_mutex_lock(&resourceLock);
     
     NSRect r = [view frame];
     if(viewRect.origin.x != r.origin.x || 
@@ -48,24 +31,26 @@ static void printLockDebugInfo(char *message, char *func, int line)
         viewRect = r;
     }
 
-    [self unlock];
+    pthread_mutex_unlock(&resourceLock);
 }
 
 - (BOOL) needsUpdate
 {
     BOOL r;
-    [self lock];
+    pthread_mutex_lock(&resourceLock);
     
     r = viewUpdated;
     viewUpdated = FALSE;
     
-    [self unlock];
+    pthread_mutex_unlock(&resourceLock);
 
     return r;
 }
 
 - (id) initWithContext:(NSOpenGLContext *)context view: (NSView *)nsView
 {
+    DBG_PRINT("ContextUpdater::init.0 view %p, ctx %p\n", view, ctx);
+    pthread_mutex_init(&resourceLock, NULL); // fast non-recursive
     ctx = context;
     view = nsView;
     [ctx retain];
@@ -73,15 +58,19 @@ static void printLockDebugInfo(char *message, char *func, int line)
     viewRect = [view frame];
     viewUpdated = TRUE;
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(update:) name:NSViewGlobalFrameDidChangeNotification object: view];
+    DBG_PRINT("ContextUpdater::init.X\n");
 
     return [super init];
 }
 
 - (void) dealloc
 {
+    DBG_PRINT("ContextUpdater::dealloc.0 view %p, ctx %p\n", view, ctx);
     [[NSNotificationCenter defaultCenter] removeObserver:self];
     [view release];
     [ctx release];
+    pthread_mutex_destroy(&resourceLock);
+    DBG_PRINT("ContextUpdater::dealloc.X\n");
     
     [super dealloc];
 }
diff --git a/src/jogl/native/macosx/MacOSXWindowSystemInterface.h b/src/jogl/native/macosx/MacOSXWindowSystemInterface.h
index 3625cfbde..b2d7f9db8 100644
--- a/src/jogl/native/macosx/MacOSXWindowSystemInterface.h
+++ b/src/jogl/native/macosx/MacOSXWindowSystemInterface.h
@@ -3,11 +3,11 @@
 #import <OpenGL/CGLTypes.h>
 #import <jni.h>
 
-// #define VERBOSE_ON 1
+#define VERBOSE_ON 1
 
 #ifdef VERBOSE_ON
-    // #define DBG_PRINT(...) NSLog(@ ## __VA_ARGS__)
-    #define DBG_PRINT(...) fprintf(stderr, __VA_ARGS__); fflush(stderr)
+    #define DBG_PRINT(...) NSLog(@ __VA_ARGS__)
+    // #define DBG_PRINT(...) fprintf(stderr, __VA_ARGS__); fflush(stderr)
 #else
     #define DBG_PRINT(...)
 #endif
diff --git a/src/nativewindow/classes/javax/media/nativewindow/NativeWindowFactory.java b/src/nativewindow/classes/javax/media/nativewindow/NativeWindowFactory.java
index 60ce07f09..b6c850098 100644
--- a/src/nativewindow/classes/javax/media/nativewindow/NativeWindowFactory.java
+++ b/src/nativewindow/classes/javax/media/nativewindow/NativeWindowFactory.java
@@ -475,4 +475,33 @@ public abstract class NativeWindowFactory {
         NativeWindow. Implementors of concrete NativeWindowFactory
         subclasses should override this method. */
     protected abstract NativeWindow getNativeWindowImpl(Object winObj, AbstractGraphicsConfiguration config) throws IllegalArgumentException;
+    
+    /**
+     * Returns the {@link OffscreenLayerSurface} instance of this {@link NativeSurface}.
+     * <p>
+     * In case this surface is a {@link NativeWindow}, we traverse from the given surface 
+     * up to root until a {@link OffscreenLayerSurface} is found.
+     * </p>
+     * 
+     * @param surface The surface to query.
+     * @param ifEnabled If true, only return the enabled {@link OffscreenLayerSurface}, see {@link OffscreenLayerSurface#isOffscreenLayerSurfaceEnabled()}. 
+     * @return
+     */
+    public static OffscreenLayerSurface getOffscreenLayerSurface(NativeSurface surface, boolean ifEnabled) {
+        if(surface instanceof OffscreenLayerSurface) {
+            final OffscreenLayerSurface ols = (OffscreenLayerSurface) surface;
+            return ( !ifEnabled || ols.isOffscreenLayerSurfaceEnabled() ) ? ols : null;
+        }
+        if(surface instanceof NativeWindow) {
+            NativeWindow nw = ((NativeWindow) surface).getParent();
+            while(null != nw) {
+                if(nw instanceof OffscreenLayerSurface) {
+                    final OffscreenLayerSurface ols = (OffscreenLayerSurface) nw;
+                    return ( !ifEnabled || ols.isOffscreenLayerSurfaceEnabled() ) ? ols : null;
+                }
+                nw = nw.getParent();                
+            }
+        }
+        return null;            
+    }
 }
diff --git a/src/nativewindow/classes/javax/media/nativewindow/OffscreenLayerSurface.java b/src/nativewindow/classes/javax/media/nativewindow/OffscreenLayerSurface.java
new file mode 100644
index 000000000..82ae0f39e
--- /dev/null
+++ b/src/nativewindow/classes/javax/media/nativewindow/OffscreenLayerSurface.java
@@ -0,0 +1,51 @@
+/**
+ * Copyright 2011 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package javax.media.nativewindow;
+
+/**
+ * Interface specifying the offscreen layer surface protocol.
+ */
+public interface OffscreenLayerSurface {
+  /** Returns true if this instance uses an offscreen layer, otherwise false. */
+  public boolean isOffscreenLayerSurfaceEnabled();
+  
+  /** 
+   * Attach the offscreen layer to this offscreen layer surface.
+   * @see #isOffscreenLayerSurfaceEnabled()
+   * @throws NativeWindowException if {@link #isOffscreenLayerSurfaceEnabled()} == false
+   */
+  public void attachSurfaceLayer(final long layerHandle) throws NativeWindowException;
+  
+  /** 
+   * Detaches a previously attached offscreen layer from this offscreen layer surface.
+   * @see #attachSurfaceLayer(long)
+   * @see #isOffscreenLayerSurfaceEnabled()
+   * @throws NativeWindowException if {@link #isOffscreenLayerSurfaceEnabled()} == false
+   */
+  public void detachSurfaceLayer(final long layerHandle) throws NativeWindowException;
+}
diff --git a/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTUtil.java b/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTUtil.java
index 4435c4f8f..ddf453bab 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTUtil.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTUtil.java
@@ -57,6 +57,7 @@ public class JAWTUtil {
 
   // See whether we're running in headless mode
   private static final boolean headlessMode;
+  private static final JAWT jawtLockObject;
 
   // Java2D magic ..
   private static final Method isQueueFlusherThread;
@@ -85,29 +86,26 @@ public class JAWTUtil {
        return Platform.OS_TYPE == Platform.OSType.MACOS &&
               Platform.OS_VERSION_NUMBER.compareTo(JAWT.JAWT_MacOSXCALayerMinVersion) >= 0;      
   }
-  
+ 
   /**
-   * 
-   * FIXME: Need to get rid of the cached JAWT instance, 
-   *        in case we like to have dual usage of offscreenLayeredSurface and onscreen.
-   *        This would be done implicit by using NEWT .. hence low prio.
-   *        
    * @param useOffscreenLayerIfAvailable
    * @return
    */
-  public static boolean setCachedJAWTVersionFlags(boolean useOffscreenLayerIfAvailable) {
-    if(JAWT.isJAWTInstantiated()) { return false; } // already instantiated
-    
-    if(useOffscreenLayerIfAvailable && isOffscreenLayerSupported()) {
-        JAWT.setJAWTVersionFlags(JAWTFactory.JAWT_VERSION_1_4 | JAWT.JAWT_MACOSX_USE_CALAYER);
-       return true;
+  public static JAWT getJAWT(boolean useOffscreenLayerIfAvailable) {
+    int jawt_version_flags = JAWTFactory.JAWT_VERSION_1_4;
+    if(useOffscreenLayerIfAvailable) {
+        switch(Platform.OS_TYPE) {
+            case MACOS:
+                if(Platform.OS_VERSION_NUMBER.compareTo(JAWT.JAWT_MacOSXCALayerMinVersion) >= 0) {
+                    jawt_version_flags |= JAWT.JAWT_MACOSX_USE_CALAYER;
+                }
+        }
     }
-    JAWT.setJAWTVersionFlags(JAWTFactory.JAWT_VERSION_1_4);
-    return !useOffscreenLayerIfAvailable; // n/a
+    return JAWT.getJAWT(jawt_version_flags);
   }
   
-  public static boolean isCachedJAWTUsingOffscreenLayer() {
-      return 0 != ( JAWT.getJAWT().getVersionCached() & JAWT.JAWT_MACOSX_USE_CALAYER );
+  public static boolean isJAWTUsingOffscreenLayer(JAWT jawt) {
+      return 0 != ( jawt.getCachedVersion() & JAWT.JAWT_MACOSX_USE_CALAYER );
   }
   
   static {
@@ -115,19 +113,19 @@ public class JAWTUtil {
     JAWTJNILibLoader.loadNativeWindow("awt");
 
     headlessMode = GraphicsEnvironment.isHeadless();
-    if(!headlessMode) {
-        JAWT.setJAWTVersionFlags(JAWTFactory.JAWT_VERSION_1_4);
-    }
     boolean ok = false;
     Class<?> jC = null;
     Method m = null;
     if (!headlessMode) {
+        jawtLockObject = getJAWT(false); // don't care for offscreen layer here
         try {
             jC = Class.forName("jogamp.opengl.awt.Java2D");
             m = jC.getMethod("isQueueFlusherThread", (Class[])null);
             ok = true;
         } catch (Exception e) {
         }
+    } else {
+        jawtLockObject = null; // headless !
     }
     isQueueFlusherThread = m;
     j2dExist = ok;
@@ -166,21 +164,21 @@ public class JAWTUtil {
     jawtToolkitLock = new JAWTToolkitLock();
 
     // trigger native AWT toolkit / properties initialization
-    Map desktophints = null;
+    Map<?,?> desktophints = null;
     try {
         if(EventQueue.isDispatchThread()) {
-            desktophints = (Map)(Toolkit.getDefaultToolkit().getDesktopProperty("awt.font.desktophints"));
+            desktophints = (Map<?,?>)(Toolkit.getDefaultToolkit().getDesktopProperty("awt.font.desktophints"));
         } else {
-            final ArrayList desktophintsBucket = new ArrayList(1);
+            final ArrayList<Map<?,?>> desktophintsBucket = new ArrayList<Map<?,?>>(1);
             EventQueue.invokeAndWait(new Runnable() {
                 public void run() {
-                    Map _desktophints = (Map)(Toolkit.getDefaultToolkit().getDesktopProperty("awt.font.desktophints"));
+                    Map<?,?> _desktophints = (Map<?,?>)(Toolkit.getDefaultToolkit().getDesktopProperty("awt.font.desktophints"));
                     if(null!=_desktophints) {
                         desktophintsBucket.add(_desktophints);
                     }
                 }
             });
-            desktophints = ( desktophintsBucket.size() > 0 ) ? (Map)desktophintsBucket.get(0) : null ;
+            desktophints = ( desktophintsBucket.size() > 0 ) ? desktophintsBucket.get(0) : null ;
         }
     } catch (InterruptedException ex) {
         ex.printStackTrace();
@@ -226,7 +224,7 @@ public class JAWTUtil {
    * JAWT's native Lock() function calls SunToolkit.awtLock(),
    * which just uses AWT's global ReentrantLock.<br>
    */
-  public static void awtLock() {
+  private static void awtLock() {
     if(hasSunToolkitAWTLock) {
         try {
             sunToolkitAWTLockMethod.invoke(null, (Object[])null);
@@ -234,7 +232,7 @@ public class JAWTUtil {
           throw new NativeWindowException("SunToolkit.awtLock failed", e);
         }
     } else {
-        JAWT.getJAWT().Lock();
+        jawtLockObject.Lock();
     }
   }
 
@@ -244,7 +242,7 @@ public class JAWTUtil {
    * JAWT's native Unlock() function calls SunToolkit.awtUnlock(),
    * which just uses AWT's global ReentrantLock.<br>
    */
-  public static void awtUnlock() {
+  private static void awtUnlock() {
     if(hasSunToolkitAWTLock) {
         try {
             sunToolkitAWTUnlockMethod.invoke(null, (Object[])null);
@@ -252,7 +250,7 @@ public class JAWTUtil {
           throw new NativeWindowException("SunToolkit.awtUnlock failed", e);
         }
     } else {
-        JAWT.getJAWT().Unlock();
+        jawtLockObject.Unlock();
     }
   }
 
diff --git a/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTWindow.java b/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTWindow.java
index efd3522b8..4d5fac891 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTWindow.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/jawt/JAWTWindow.java
@@ -48,6 +48,7 @@ import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.NativeWindow;
 import javax.media.nativewindow.NativeWindowException;
+import javax.media.nativewindow.OffscreenLayerSurface;
 import javax.media.nativewindow.SurfaceUpdatedListener;
 import javax.media.nativewindow.awt.AWTGraphicsConfiguration;
 import javax.media.nativewindow.util.Insets;
@@ -58,16 +59,21 @@ import javax.media.nativewindow.util.RectangleImmutable;
 
 import jogamp.nativewindow.SurfaceUpdatedHelper;
 
-public abstract class JAWTWindow implements NativeWindow {
+public abstract class JAWTWindow implements NativeWindow, OffscreenLayerSurface {
   protected static final boolean DEBUG = JAWTUtil.DEBUG;
 
+  // user properties
+  protected boolean shallUseOffscreenLayer = false;
+  
   // lifetime: forever
   protected Component component;
-  protected boolean isApplet;
   protected AWTGraphicsConfiguration config;
   private SurfaceUpdatedHelper surfaceUpdatedHelper = new SurfaceUpdatedHelper();
 
-  // lifetime: valid after lock, forever until invalidate
+  // lifetime: valid after lock but may change with each 1st lock, purges after invalidate
+  private boolean isApplet;
+  private JAWT jawt;
+  private boolean isOffscreenLayerSurface;
   protected long drawable;
   protected Rectangle bounds;
 
@@ -93,16 +99,25 @@ public abstract class JAWTWindow implements NativeWindow {
     invalidate();
     this.component = windowObject;
     this.isApplet = false;
-    while(!isApplet && null != windowObject) {
-        isApplet = windowObject instanceof Applet;
-        windowObject = windowObject.getParent();
-    }
-    if(isApplet) {
-        JAWTUtil.setCachedJAWTVersionFlags(true); // useOffScreenLayerIfAvailable := true
-    }
     validateNative();
   }
   
+  /** 
+   * Request an JAWT offscreen layer if supported.
+   * Shall be called before {@link #lockSurface()}.
+   * 
+   * @see #getShallUseOffscreenLayer()
+   * @see #isOffscreenLayerSurfaceEnabled() 
+   */
+  public void setShallUseOffscreenLayer(boolean v) {
+      shallUseOffscreenLayer = v;
+  }
+  
+  /** Returns the property set by {@link #setShallUseOffscreenLayer(boolean)}. */
+  public final boolean getShallUseOffscreenLayer() {
+      return shallUseOffscreenLayer;
+  }
+  
   /**
    * Implementors shall ensure that all native handles are valid, eg. the {@link javax.media.nativewindow.awt.AWTGraphicsDevice AWTGraphicsDevice}'s
    * subtype via {@link javax.media.nativewindow.awt.AWTGraphicsDevice#setSubType(String, long) awtGraphicsDevice.setSubType(NativeWindowFactory.TYPE_X11, displayHandle)}.
@@ -116,6 +131,8 @@ public abstract class JAWTWindow implements NativeWindow {
 
   protected synchronized void invalidate() {
     invalidateNative();
+    jawt = null;
+    isOffscreenLayerSurface = false;
     drawable= 0;
     bounds = new Rectangle();
   }
@@ -137,10 +154,71 @@ public abstract class JAWTWindow implements NativeWindow {
     return component;
   }
   
+  /** 
+   * Returns true if the AWT component is parented to an {@link java.applet.Applet}, 
+   * otherwise false. This information is valid only after {@link #lockSurface()}. 
+   */
   public final boolean isApplet() {
       return isApplet;
   }
 
+  /** Returns the underlying JAWT instance created @ {@link #lockSurface()}. */
+  public final JAWT getJAWT() {
+      return jawt;
+  }
+
+  /** 
+   * {@inheritDoc}
+   * @see #setShallUseOffscreenLayer(boolean) 
+   */
+  public final boolean isOffscreenLayerSurfaceEnabled() { 
+      return isOffscreenLayerSurface;
+  }
+  
+  /** 
+   * {@inheritDoc}
+   */
+  public final void attachSurfaceLayer(final long layerHandle) throws NativeWindowException {  
+      if( !isOffscreenLayerSurfaceEnabled() ) {
+          throw new NativeWindowException("Not an offscreen layer surface");
+      }
+      int lockRes = lockSurface();
+      if (NativeSurface.LOCK_SURFACE_NOT_READY >= lockRes) {
+          throw new NativeWindowException("Could not lock (offscreen layer): "+this);
+      }
+      try {
+          if(DEBUG) {
+            System.err.println("JAWTWindow.attachSurfaceHandle(): 0x"+Long.toHexString(layerHandle));
+          }
+          attachSurfaceLayerImpl(layerHandle);
+      } finally {
+          unlockSurface();
+      }
+  }  
+  protected abstract void attachSurfaceLayerImpl(final long layerHandle);
+  
+  /** 
+   * {@inheritDoc}
+   */
+  public final void detachSurfaceLayer(final long layerHandle) throws NativeWindowException {  
+      if( !isOffscreenLayerSurfaceEnabled() ) {
+          throw new java.lang.UnsupportedOperationException("Not an offscreen layer surface");
+      }
+      int lockRes = lockSurface();
+      if (NativeSurface.LOCK_SURFACE_NOT_READY >= lockRes) {
+          throw new NativeWindowException("Could not lock (offscreen layer): "+this);
+      }
+      try {
+          if(DEBUG) {
+            System.err.println("JAWTWindow.detachSurfaceHandle(): 0x"+Long.toHexString(layerHandle));
+          }
+          detachSurfaceLayerImpl(layerHandle);
+      } finally {
+          unlockSurface();
+      }
+  }  
+  protected abstract void detachSurfaceLayerImpl(final long layerHandle);
+  
   //
   // SurfaceUpdateListener
   //
@@ -167,6 +245,24 @@ public abstract class JAWTWindow implements NativeWindow {
 
   private RecursiveLock surfaceLock = LockFactory.createRecursiveLock();
 
+  private void determineIfApplet() {
+    Component c = component;
+    while(!isApplet && null != c) {
+        isApplet = c instanceof Applet;
+        c = c.getParent();
+    }
+  }
+  
+  /**
+   * If JAWT offscreen layer is supported, 
+   * implementation shall respect {@link #getShallUseOffscreenLayer()}
+   * and may respect {@link #isApplet()}.
+   * 
+   * @return The JAWT instance reflecting offscreen layer support, etc.
+   * 
+   * @throws NativeWindowException
+   */
+  protected abstract JAWT fetchJAWTImpl() throws NativeWindowException;
   protected abstract int lockSurfaceImpl() throws NativeWindowException;
 
   public final int lockSurface() throws NativeWindowException {
@@ -175,10 +271,13 @@ public abstract class JAWTWindow implements NativeWindow {
     int res = surfaceLock.getHoldCount() == 1 ? LOCK_SURFACE_NOT_READY : LOCK_SUCCESS; // new lock ?
 
     if ( LOCK_SURFACE_NOT_READY == res ) {
+        determineIfApplet();
         try {
             final AbstractGraphicsDevice adevice = config.getScreen().getDevice();
             adevice.lock();
             try {
+                jawt = fetchJAWTImpl();
+                isOffscreenLayerSurface = JAWTUtil.isJAWTUsingOffscreenLayer(jawt);
                 res = lockSurfaceImpl();
             } finally {
                 if (LOCK_SURFACE_NOT_READY >= res) {
diff --git a/src/nativewindow/classes/jogamp/nativewindow/jawt/macosx/MacOSXJAWTWindow.java b/src/nativewindow/classes/jogamp/nativewindow/jawt/macosx/MacOSXJAWTWindow.java
index c19569606..de7feb3b8 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/jawt/macosx/MacOSXJAWTWindow.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/jawt/macosx/MacOSXJAWTWindow.java
@@ -63,8 +63,9 @@ import jogamp.nativewindow.macosx.OSXUtil;
 public class MacOSXJAWTWindow extends JAWTWindow implements SurfaceChangeable {
   public MacOSXJAWTWindow(Object comp, AbstractGraphicsConfiguration config) {
     super(comp, config);
-    isOffscreenLayerSurface = JAWTUtil.isCachedJAWTUsingOffscreenLayer();
-    dumpInfo();
+    if(DEBUG) {
+        dumpInfo();
+    }
   }
 
   protected void validateNative() throws NativeWindowException {
@@ -72,7 +73,7 @@ public class MacOSXJAWTWindow extends JAWTWindow implements SurfaceChangeable {
 
   protected void invalidateNative() {
       surfaceHandle=0;
-      if(isOffscreenLayerSurface) {
+      if(isOffscreenLayerSurfaceEnabled()) {
           if(0 != drawable) {
               OSXUtil.DestroyNSWindow(drawable);
               drawable = 0;
@@ -80,50 +81,20 @@ public class MacOSXJAWTWindow extends JAWTWindow implements SurfaceChangeable {
       }
   }
 
-  public final boolean isOffscreenLayerSurface() { 
-      return isOffscreenLayerSurface;
-  }  
-  public void attachSurfaceLayer(final long layerHandle) {
-      if( !isOffscreenLayerSurface() ) {
-          throw new NativeWindowException("Not using CALAYER");
-      }
-      int lockRes = lockSurface();
-      if (NativeSurface.LOCK_SURFACE_NOT_READY >= lockRes) {
-          throw new NativeWindowException("Could not lock layeredSurfaceHost: "+this);
-      }
-      try {
-          if(DEBUG) {
-            System.err.println("MacOSXJAWTWindow.attachSurfaceLayer(): 0x"+Long.toHexString(layerHandle));
-          }
-          OSXUtil.AddCASublayer(rootSurfaceLayerHandle, layerHandle);
-      } finally {
-          unlockSurface();
-      }
+  protected void attachSurfaceLayerImpl(final long layerHandle) {
+      OSXUtil.AddCASublayer(rootSurfaceLayerHandle, layerHandle);
   }
-  public void detachSurfaceLayer(final long layerHandle) {
-      if( !isOffscreenLayerSurface() ) {
-          throw new NativeWindowException("Not using CALAYER");
-      }
-      int lockRes = lockSurface();
-      if (NativeSurface.LOCK_SURFACE_NOT_READY >= lockRes) {
-          throw new NativeWindowException("Could not lock layeredSurfaceHost: "+this);
-      }
-      try {
-          if(DEBUG) {
-            System.err.println("MacOSXJAWTWindow.detachSurfaceLayer(): 0x"+Long.toHexString(layerHandle));
-          }
-          OSXUtil.RemoveCASublayer(rootSurfaceLayerHandle, layerHandle);
-      } finally {
-          unlockSurface();
-      }
+  
+  protected void detachSurfaceLayerImpl(final long layerHandle) {
+      OSXUtil.RemoveCASublayer(rootSurfaceLayerHandle, layerHandle);
   }
     
   public long getSurfaceHandle() {
-    return isOffscreenLayerSurface ? surfaceHandle : super.getSurfaceHandle() ;
+    return isOffscreenLayerSurfaceEnabled() ? surfaceHandle : super.getSurfaceHandle() ;
   }
   
   public void setSurfaceHandle(long surfaceHandle) {
-      if( !isOffscreenLayerSurface() ) {
+      if( !isOffscreenLayerSurfaceEnabled() ) {
           throw new java.lang.UnsupportedOperationException("Not using CALAYER");
       }
       if(DEBUG) {
@@ -147,11 +118,14 @@ public class MacOSXJAWTWindow extends JAWTWindow implements SurfaceChangeable {
     return sscSet ? sscHeight: super.getHeight();
   }
 
+  protected JAWT fetchJAWTImpl() throws NativeWindowException {
+       // use offscreen if supported and [ applet or requested ]
+      return JAWTUtil.getJAWT(getShallUseOffscreenLayer() || isApplet());
+  }
   protected int lockSurfaceImpl() throws NativeWindowException {
     int ret = NativeWindow.LOCK_SURFACE_NOT_READY;
     if(null == ds) {
-        final JAWT jawt = JAWT.getJAWT();
-        ds = jawt.GetDrawingSurface(component);
+        ds = getJAWT().GetDrawingSurface(component);
         if (ds == null) {
           // Widget not yet realized
           unlockSurfaceImpl();
@@ -189,12 +163,12 @@ public class MacOSXJAWTWindow extends JAWTWindow implements SurfaceChangeable {
         }
     }
     updateBounds(dsi.getBounds());
-    if (DEBUG && firstLock) {
+    if (DEBUG && firstLock ) {
       dumpInfo();
     }
     firstLock = false;
-    if( !isOffscreenLayerSurface ) {
-        macosxdsi = (JAWT_MacOSXDrawingSurfaceInfo) dsi.platformInfo();
+    if( !isOffscreenLayerSurfaceEnabled() ) {
+        macosxdsi = (JAWT_MacOSXDrawingSurfaceInfo) dsi.platformInfo(getJAWT());
         if (macosxdsi == null) {
           unlockSurfaceImpl();
           return NativeWindow.LOCK_SURFACE_NOT_READY;
@@ -257,7 +231,7 @@ public class MacOSXJAWTWindow extends JAWTWindow implements SurfaceChangeable {
         if (dsLocked) {
             ds.Unlock();
         }
-        JAWT.getJAWT().FreeDrawingSurface(ds);
+        getJAWT().FreeDrawingSurface(ds);
     }
     ds = null;
     dsi = null;
@@ -265,10 +239,13 @@ public class MacOSXJAWTWindow extends JAWTWindow implements SurfaceChangeable {
 
   private void dumpInfo() {
       System.err.println("MaxOSXJAWTWindow: 0x"+Integer.toHexString(this.hashCode())+" - thread: "+Thread.currentThread().getName());
-      // System.err.println(this);
-      System.err.println("JAWT version: 0x"+Integer.toHexString(JAWT.getJAWT().getVersionCached())+
-                         ", CA_LAYER: "+ (0!=(JAWT.getJAWT().getVersionCached() & JAWT.JAWT_MACOSX_USE_CALAYER))+
-                         ", isLayeredSurface "+isOffscreenLayerSurface()+", bounds "+bounds);
+      if(null != getJAWT()) {
+          System.err.println("JAWT version: 0x"+Integer.toHexString(getJAWT().getCachedVersion())+
+                             ", CA_LAYER: "+ JAWTUtil.isJAWTUsingOffscreenLayer(getJAWT())+
+                             ", isLayeredSurface "+isOffscreenLayerSurfaceEnabled()+", bounds "+bounds);
+      } else {
+          System.err.println("JAWT n/a, bounds "+bounds);          
+      }
       // Thread.dumpStack();
   }
   
@@ -291,7 +268,6 @@ public class MacOSXJAWTWindow extends JAWTWindow implements SurfaceChangeable {
   
   private JAWT_MacOSXDrawingSurfaceInfo macosxdsi;
   
-  private final boolean isOffscreenLayerSurface;
   private long rootSurfaceLayerHandle = 0; // is autoreleased, once it is attached to the JAWT_SurfaceLayer
   
   private long surfaceHandle = 0;
diff --git a/src/nativewindow/classes/jogamp/nativewindow/jawt/windows/WindowsJAWTWindow.java b/src/nativewindow/classes/jogamp/nativewindow/jawt/windows/WindowsJAWTWindow.java
index 610ce0f15..581e2337c 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/jawt/windows/WindowsJAWTWindow.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/jawt/windows/WindowsJAWTWindow.java
@@ -47,6 +47,7 @@ import javax.media.nativewindow.util.Point;
 
 import jogamp.nativewindow.jawt.JAWT;
 import jogamp.nativewindow.jawt.JAWTFactory;
+import jogamp.nativewindow.jawt.JAWTUtil;
 import jogamp.nativewindow.jawt.JAWTWindow;
 import jogamp.nativewindow.jawt.JAWT_DrawingSurface;
 import jogamp.nativewindow.jawt.JAWT_DrawingSurfaceInfo;
@@ -65,9 +66,20 @@ public class WindowsJAWTWindow extends JAWTWindow {
     windowHandle = 0;
   }
 
+  protected void attachSurfaceLayerImpl(final long layerHandle) {
+      throw new UnsupportedOperationException("offscreen layer not supported");
+  }
+  protected void detachSurfaceLayerImpl(final long layerHandle) {
+      throw new UnsupportedOperationException("offscreen layer not supported");
+  }
+  
+  protected JAWT fetchJAWTImpl() throws NativeWindowException {
+      return JAWTUtil.getJAWT(false); // no offscreen
+  }
+  
   protected int lockSurfaceImpl() throws NativeWindowException {
     int ret = NativeWindow.LOCK_SUCCESS;
-    ds = JAWT.getJAWT().GetDrawingSurface(component);
+    ds = getJAWT().GetDrawingSurface(component);
     if (ds == null) {
       // Widget not yet realized
       unlockSurfaceImpl();
@@ -92,7 +104,8 @@ public class WindowsJAWTWindow extends JAWTWindow {
       unlockSurfaceImpl();
       return LOCK_SURFACE_NOT_READY;
     }
-    win32dsi = (JAWT_Win32DrawingSurfaceInfo) dsi.platformInfo();
+    updateBounds(dsi.getBounds());
+    win32dsi = (JAWT_Win32DrawingSurfaceInfo) dsi.platformInfo(getJAWT());
     if (win32dsi == null) {
       unlockSurfaceImpl();
       return LOCK_SURFACE_NOT_READY;
@@ -102,14 +115,11 @@ public class WindowsJAWTWindow extends JAWTWindow {
     if (windowHandle == 0 || drawable == 0) {
       unlockSurfaceImpl();
       return LOCK_SURFACE_NOT_READY;
-    } else {
-      updateBounds(dsi.getBounds());
     }
     return ret;
   }
 
   protected void unlockSurfaceImpl() throws NativeWindowException {
-    long startTime = 0;
     if(null!=ds) {
         if (null!=dsi) {
             ds.FreeDrawingSurfaceInfo(dsi);
@@ -117,7 +127,7 @@ public class WindowsJAWTWindow extends JAWTWindow {
         if (dsLocked) {
             ds.Unlock();
         }
-        JAWT.getJAWT().FreeDrawingSurface(ds);
+        getJAWT().FreeDrawingSurface(ds);
     }
     ds = null;
     dsi = null;
diff --git a/src/nativewindow/classes/jogamp/nativewindow/jawt/x11/X11JAWTWindow.java b/src/nativewindow/classes/jogamp/nativewindow/jawt/x11/X11JAWTWindow.java
index 16dcf11fe..e469fe337 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/jawt/x11/X11JAWTWindow.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/jawt/x11/X11JAWTWindow.java
@@ -48,6 +48,7 @@ import javax.media.nativewindow.util.Point;
 
 import jogamp.nativewindow.jawt.JAWT;
 import jogamp.nativewindow.jawt.JAWTFactory;
+import jogamp.nativewindow.jawt.JAWTUtil;
 import jogamp.nativewindow.jawt.JAWTWindow;
 import jogamp.nativewindow.jawt.JAWT_DrawingSurface;
 import jogamp.nativewindow.jawt.JAWT_DrawingSurfaceInfo;
@@ -88,9 +89,20 @@ public class X11JAWTWindow extends JAWTWindow {
   
   protected void invalidateNative() { }
 
+  protected void attachSurfaceLayerImpl(final long layerHandle) {
+      throw new UnsupportedOperationException("offscreen layer not supported");
+  }
+  protected void detachSurfaceLayerImpl(final long layerHandle) {
+      throw new UnsupportedOperationException("offscreen layer not supported");
+  }
+  
+  protected JAWT fetchJAWTImpl() throws NativeWindowException {
+      return JAWTUtil.getJAWT(false); // no offscreen
+  }
+    
   protected int lockSurfaceImpl() throws NativeWindowException {
     int ret = NativeWindow.LOCK_SUCCESS;
-    ds = JAWT.getJAWT().GetDrawingSurface(component);
+    ds = getJAWT().GetDrawingSurface(component);
     if (ds == null) {
       // Widget not yet realized
       unlockSurfaceImpl();
@@ -115,7 +127,8 @@ public class X11JAWTWindow extends JAWTWindow {
       unlockSurfaceImpl();
       return LOCK_SURFACE_NOT_READY;
     }
-    x11dsi = (JAWT_X11DrawingSurfaceInfo) dsi.platformInfo();
+    updateBounds(dsi.getBounds());
+    x11dsi = (JAWT_X11DrawingSurfaceInfo) dsi.platformInfo(getJAWT());
     if (x11dsi == null) {
       unlockSurfaceImpl();
       return LOCK_SURFACE_NOT_READY;
@@ -124,8 +137,6 @@ public class X11JAWTWindow extends JAWTWindow {
     if (drawable == 0) {
       unlockSurfaceImpl();
       return LOCK_SURFACE_NOT_READY;
-    } else {
-      updateBounds(dsi.getBounds());
     }
     return ret;
   }
@@ -138,7 +149,7 @@ public class X11JAWTWindow extends JAWTWindow {
         if (dsLocked) {
             ds.Unlock();
         }
-        JAWT.getJAWT().FreeDrawingSurface(ds);
+        getJAWT().FreeDrawingSurface(ds);
     }
     ds = null;
     dsi = null;
diff --git a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
index 1ce8f09ca..8a0cb8d6c 100644
--- a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
+++ b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
@@ -47,6 +47,7 @@ import javax.media.nativewindow.awt.AWTWindowClosingProtocol;
 import javax.swing.MenuSelectionManager;
 
 import jogamp.nativewindow.awt.AWTMisc;
+import jogamp.nativewindow.jawt.JAWTWindow;
 import jogamp.newt.Debug;
 import jogamp.newt.awt.event.AWTParentWindowAdapter;
 import jogamp.newt.awt.event.NewtFactoryAWT;
@@ -64,7 +65,7 @@ import com.jogamp.newt.event.awt.AWTMouseAdapter;
 public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProtocol {
     public static final boolean DEBUG = Debug.debug("Window");
 
-    NativeWindow nativeWindow = null;
+    JAWTWindow jawtWindow = null;
     Window newtChild = null;
     boolean isNewtChildOnscreen = true;
     int newtChildCloseOp;
@@ -130,7 +131,38 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
     }
     
     private final void createNativeWindow(CapabilitiesImmutable caps) {
-        nativeWindow = NewtFactoryAWT.getNativeWindow(this, caps);
+        jawtWindow = NewtFactoryAWT.getNativeWindow(this, caps);
+    }
+    
+    /** 
+     * Request an JAWT offscreen layer if supported it. 
+     * Shall be called before {@link #addNotify()} is issued, 
+     * ie. before adding the component to the AWT tree and make it visible.
+     * 
+     * @see #isOffscreenLayerSurface()
+     */
+    public void setShallUseOffscreenLayer(boolean v) {
+        jawtWindow.setShallUseOffscreenLayer(v);
+    }
+    
+    /** 
+     * Returns true if the underlying JAWT uses offscreen layering, 
+     * otherwise false. This information is valid only after {@link #addNotify()} is issued, 
+     * ie. before adding the component to the AWT tree and make it visible.
+     * 
+     * @see #setShallUseOffscreenLayer(boolean)
+     */
+    public boolean isOffscreenLayerSurface() {
+        return jawtWindow.isOffscreenLayerSurfaceEnabled();
+    }
+    
+    /** 
+     * Returns true if the AWT component is parented to an {@link java.applet.Applet}, 
+     * otherwise false. This information is valid only after {@link #addNotify()} is issued, 
+     * ie. before adding the component to the AWT tree and make it visible. 
+     */
+    public boolean isApplet() {
+        return jawtWindow.isApplet();
     }
     
     class FocusAction implements Window.FocusRunnable {
@@ -195,7 +227,7 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
 
     /** @return this AWT Canvas NativeWindow representation, may be null in case {@link #removeNotify()} has been called,
      * or {@link #addNotify()} hasn't been called yet.*/
-    public NativeWindow getNativeWindow() { return nativeWindow; }
+    public NativeWindow getNativeWindow() { return jawtWindow; }
     
     public int getDefaultCloseOperation() {
         return awtWindowClosingProtocol.getDefaultCloseOperation();
@@ -285,7 +317,7 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
 
       newtChild.setFocusAction(null); // no AWT focus traversal ..
       if(add) {
-          NewtFactoryAWT.updateGraphicsConfiguration(nativeWindow, this);
+          NewtFactoryAWT.updateGraphicsConfiguration(jawtWindow, this);
           if(DEBUG) {
             System.err.println("NewtCanvasAWT.reparentWindow: "+newtChild);
           }
@@ -308,7 +340,7 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
           }
           setSize(w, h);
           newtChild.setSize(w, h);
-          newtChild.reparentWindow(nativeWindow);
+          newtChild.reparentWindow(jawtWindow);
           newtChild.setVisible(true);
           configureNewtChild(true);
           newtChild.sendWindowEvent(WindowEvent.EVENT_WINDOW_RESIZED); // trigger a resize/relayout to listener
@@ -338,9 +370,9 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
                 System.err.println("NewtCanvasAWT.destroy(): "+newtChild+", from "+cont);
             }
             configureNewtChild(false);
-            if(null!=nativeWindow) {
-                nativeWindow.destroy();
-                nativeWindow=null;
+            if(null!=jawtWindow) {
+                jawtWindow.destroy();
+                jawtWindow=null;
             }
             newtChild.setVisible(false);
             newtChild.reparentWindow(null);
diff --git a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
index 2e86cb512..7ba892b37 100755
--- a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
+++ b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
@@ -1,20 +1,50 @@
+/**
+ * Copyright 2011 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
 package com.jogamp.newt.awt.applet;
 
-import java.applet.*;
+import java.applet.Applet;
+import java.awt.BorderLayout;
+import java.awt.Button;
 import java.awt.Component;
 import java.awt.Container;
-import java.awt.Label;
+import java.awt.event.KeyListener;
 import java.awt.event.MouseListener;
 import java.awt.event.MouseMotionListener;
-import java.awt.event.KeyListener;
 
-import javax.media.opengl.*;
+import javax.media.opengl.FPSCounter;
+import javax.media.opengl.GLCapabilities;
+import javax.media.opengl.GLEventListener;
+import javax.media.opengl.GLProfile;
+
+import jogamp.newt.Debug;
 
 import com.jogamp.newt.awt.NewtCanvasAWT;
 import com.jogamp.newt.opengl.GLWindow;
-import java.awt.BorderLayout;
-
-import jogamp.newt.Debug;
 
 /** 
  * Simple GLEventListener deployment as an applet using JOGL. This demo must be
@@ -62,7 +92,7 @@ import jogamp.newt.Debug;
  */
 @SuppressWarnings("serial")
 public class JOGLNewtApplet1Run extends Applet {
-    public static final boolean DEBUG = Debug.debug("Applet");
+    public static final boolean DEBUG = JOGLNewtAppletBase.DEBUG;
     
     GLWindow glWindow;
     NewtCanvasAWT newtCanvasAWT;
@@ -72,6 +102,9 @@ public class JOGLNewtApplet1Run extends Applet {
     boolean glStandalone = false;
 
     public void init() {
+        if(DEBUG) {
+            System.err.println("JOGLNewtApplet1Run.init() START");
+        }
         if(!(this instanceof Container)) {
             throw new RuntimeException("This Applet is not a AWT Container");
         }
@@ -88,6 +121,7 @@ public class JOGLNewtApplet1Run extends Applet {
         int glAlphaBits=0;
         int glNumMultisampleBuffer=0;
         boolean glNoDefaultKeyListener = false;
+        boolean appletDebugTestBorder = false;
         try {
             glEventListenerClazzName = getParameter("gl_event_listener_class");
             glProfileName = getParameter("gl_profile");
@@ -104,6 +138,7 @@ public class JOGLNewtApplet1Run extends Applet {
             glWidth = JOGLNewtAppletBase.str2Int(getParameter("gl_width"), glWidth);
             glHeight = JOGLNewtAppletBase.str2Int(getParameter("gl_height"), glHeight);
             glNoDefaultKeyListener = JOGLNewtAppletBase.str2Bool(getParameter("gl_nodefaultkeyListener"), glNoDefaultKeyListener);
+            appletDebugTestBorder = JOGLNewtAppletBase.str2Bool(getParameter("appletDebugTestBorder"), appletDebugTestBorder);
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -149,18 +184,19 @@ public class JOGLNewtApplet1Run extends Applet {
             glWindow.setUpdateFPSFrames(FPSCounter.DEFAULT_FRAMES_PER_INTERVAL, System.err);
             glWindow.setUndecorated(glUndecorated);
             glWindow.setAlwaysOnTop(glAlwaysOnTop);
+            container.setLayout(new BorderLayout());
+            if(appletDebugTestBorder) {
+                container.add(new Button("North"), BorderLayout.NORTH);
+                container.add(new Button("South"), BorderLayout.SOUTH);
+                container.add(new Button("East"), BorderLayout.EAST);
+                container.add(new Button("West"), BorderLayout.WEST);
+            }
             if(glStandalone) {
                 newtCanvasAWT = null;
             } else {
                 newtCanvasAWT = new NewtCanvasAWT(glWindow);
-                container.setLayout(new BorderLayout());
                 container.add(newtCanvasAWT, BorderLayout.CENTER);
-            }
-            if(DEBUG) {
-                container.add(new Label("North"), BorderLayout.NORTH);
-                container.add(new Label("South"), BorderLayout.SOUTH);
-                container.add(new Label("East"), BorderLayout.EAST);
-                container.add(new Label("West"), BorderLayout.WEST);
+                container.validate();
             }
             base.init(glWindow);
             if(base.isValid()) {
@@ -179,9 +215,15 @@ public class JOGLNewtApplet1Run extends Applet {
         } catch (Throwable t) {
             throw new RuntimeException(t);
         }
+        if(DEBUG) {
+            System.err.println("JOGLNewtApplet1Run.init() END");
+        }
     }
 
     public void start() {
+        if(DEBUG) {
+            System.err.println("JOGLNewtApplet1Run.start() START");
+        }
         this.validate();
         this.setVisible(true);
         
@@ -195,21 +237,35 @@ public class JOGLNewtApplet1Run extends Applet {
             while (null != topC.getParent()) {
                 topC = topC.getParent();
             }
+            System.err.println("JOGLNewtApplet1Run start:");
             System.err.println("TopComponent: "+topC.getLocation()+" rel, "+topC.getLocationOnScreen()+" screen, visible "+topC.isVisible()+", "+topC);
             System.err.println("Applet Pos: "+this.getLocation()+" rel, "+p0+" screen, visible "+this.isVisible()+", "+this);
             if(null != newtCanvasAWT) {
                 System.err.println("NewtCanvasAWT Pos: "+newtCanvasAWT.getLocation()+" rel, "+newtCanvasAWT.getLocationOnScreen()+" screen, visible "+newtCanvasAWT.isVisible()+", "+newtCanvasAWT);
             }
             System.err.println("GLWindow Pos: "+glWindow.getX()+"/"+glWindow.getY()+" rel, "+glWindow.getLocationOnScreen(null)+" screen");
+            System.err.println("GLWindow: "+glWindow);
         }
         base.start();
+        if(DEBUG) {
+            System.err.println("JOGLNewtApplet1Run.stop() END");
+        }
     }
 
     public void stop() {
+        if(DEBUG) {
+            System.err.println("JOGLNewtApplet1Run.stop() START");
+        }
         base.stop();
+        if(DEBUG) {
+            System.err.println("JOGLNewtApplet1Run.stop() END");
+        }
     }
 
     public void destroy() {
+        if(DEBUG) {
+            System.err.println("JOGLNewtApplet1Run.destroy() START");
+        }
         glWindow.setVisible(false); // hide 1st
         if(!glStandalone) {
             glWindow.reparentWindow(null); // get out of newtCanvasAWT
@@ -217,6 +273,9 @@ public class JOGLNewtApplet1Run extends Applet {
         }
         base.destroy(); // destroy glWindow unrecoverable
         base=null;
+        if(DEBUG) {
+            System.err.println("JOGLNewtApplet1Run.destroy() END");
+        }
     }
 }
 
diff --git a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtAppletBase.java b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtAppletBase.java
index b1061dd14..6b135976b 100755
--- a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtAppletBase.java
+++ b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtAppletBase.java
@@ -1,18 +1,52 @@
+/**
+ * Copyright 2011 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
 package com.jogamp.newt.awt.applet;
 
-import java.lang.reflect.*;
+import java.lang.reflect.Field;
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 
 import javax.media.nativewindow.NativeWindow;
-import javax.media.opengl.*;
+import javax.media.opengl.FPSCounter;
+import javax.media.opengl.GL;
+import javax.media.opengl.GLAutoDrawable;
+import javax.media.opengl.GLEventListener;
+import javax.media.opengl.GLPipelineFactory;
 
 import jogamp.newt.Debug;
 
-import com.jogamp.opengl.util.*;
-
-import com.jogamp.newt.event.*;
+import com.jogamp.newt.event.KeyEvent;
+import com.jogamp.newt.event.KeyListener;
+import com.jogamp.newt.event.MouseListener;
+import com.jogamp.newt.event.WindowListener;
 import com.jogamp.newt.opengl.GLWindow;
+import com.jogamp.opengl.util.Animator;
+
 
 /** Shows how to deploy an applet using JOGL. This demo must be
     referenced from a web page via an &lt;applet&gt; tag. */
diff --git a/src/newt/classes/jogamp/newt/awt/event/NewtFactoryAWT.java b/src/newt/classes/jogamp/newt/awt/event/NewtFactoryAWT.java
index 9b812d22a..462cf899f 100644
--- a/src/newt/classes/jogamp/newt/awt/event/NewtFactoryAWT.java
+++ b/src/newt/classes/jogamp/newt/awt/event/NewtFactoryAWT.java
@@ -53,7 +53,7 @@ public class NewtFactoryAWT extends NewtFactory {
    *
    * @param awtCompObject must be of type java.awt.Component
    */
-  public static NativeWindow getNativeWindow(Object awtCompObject, CapabilitiesImmutable capsRequested) {
+  public static JAWTWindow getNativeWindow(Object awtCompObject, CapabilitiesImmutable capsRequested) {
       if(null==awtCompObject) {
         throw new NativeWindowException("Null AWT Component");
       }
@@ -63,19 +63,19 @@ public class NewtFactoryAWT extends NewtFactory {
       return getNativeWindow( (java.awt.Component) awtCompObject, capsRequested );
   }
 
-  public static NativeWindow getNativeWindow(java.awt.Component awtComp, CapabilitiesImmutable capsRequested) {
+  public static JAWTWindow getNativeWindow(java.awt.Component awtComp, CapabilitiesImmutable capsRequested) {
       AWTGraphicsConfiguration config = AWTGraphicsConfiguration.create(awtComp, null, capsRequested);
-      NativeWindow awtNative = NativeWindowFactory.getNativeWindow(awtComp, config); // a JAWTWindow
+      NativeWindow nw = NativeWindowFactory.getNativeWindow(awtComp, config); // a JAWTWindow
+      if(! ( nw instanceof JAWTWindow ) ) {
+          throw new NativeWindowException("Not an AWT NativeWindow: "+nw);
+      }
       if(DEBUG_IMPLEMENTATION) {
-        System.err.println("NewtFactoryAWT.getNativeWindow: "+awtComp+" -> "+awtNative);
+        System.err.println("NewtFactoryAWT.getNativeWindow: "+awtComp+" -> "+nw);
       }
-      return awtNative;
+      return (JAWTWindow)nw;
   }
   
-  public static void updateGraphicsConfiguration(NativeWindow nw, java.awt.Component awtComp) {
-      if(! ( nw instanceof JAWTWindow ) ) {
-          throw new NativeWindowException("Not an AWT NativeWindow: "+nw);
-      }
+  public static void updateGraphicsConfiguration(JAWTWindow nw, java.awt.Component awtComp) {
       if(DEBUG_IMPLEMENTATION) {
         System.err.println("NewtFactoryAWT.updateGraphicsConfiguration: (pre) "+awtComp+" -> "+nw);
       }
diff --git a/src/newt/native/NewtMacWindow.h b/src/newt/native/NewtMacWindow.h
index 7d6236059..861811b6c 100644
--- a/src/newt/native/NewtMacWindow.h
+++ b/src/newt/native/NewtMacWindow.h
@@ -37,11 +37,11 @@
 
 #include "NewtCommon.h"
 
-// #define VERBOSE_ON 1
+#define VERBOSE_ON 1
 
 #ifdef VERBOSE_ON
-    // #define DBG_PRINT(...) NSLog(@ ## __VA_ARGS__)
-    #define DBG_PRINT(...) fprintf(stderr, __VA_ARGS__); fflush(stderr)
+    #define DBG_PRINT(...) NSLog(@ __VA_ARGS__)
+    // #define DBG_PRINT(...) fprintf(stderr, __VA_ARGS__); fflush(stderr)
 #else
     #define DBG_PRINT(...)
 #endif
diff --git a/src/test/com/jogamp/opengl/test/junit/newt/parenting/TestParentingOffscreenLayer01AWT.java b/src/test/com/jogamp/opengl/test/junit/newt/parenting/TestParentingOffscreenLayer01AWT.java
index 378d43049..d6bf192c0 100644
--- a/src/test/com/jogamp/opengl/test/junit/newt/parenting/TestParentingOffscreenLayer01AWT.java
+++ b/src/test/com/jogamp/opengl/test/junit/newt/parenting/TestParentingOffscreenLayer01AWT.java
@@ -63,8 +63,6 @@ public class TestParentingOffscreenLayer01AWT extends UITestCase {
 
     @BeforeClass
     public static void initClass() {
-        // force offscreen layer JAWT, if available
-        JAWTUtil.setCachedJAWTVersionFlags(true); // useOffScreenLayerIfAvailable := true
         frameSize = new Dimension(500,300);
         preferredGLSize = new Dimension(400,200);
         minGLSize = new Dimension(200,100);
@@ -105,7 +103,7 @@ public class TestParentingOffscreenLayer01AWT extends UITestCase {
         }
     }
     
-    @Test
+    // @Test
     public void testOffscreenLayerPath0_GLCanvas() throws InterruptedException, InvocationTargetException {
         final Frame frame1 = new Frame("AWT Parent Frame");
         
@@ -128,20 +126,21 @@ public class TestParentingOffscreenLayer01AWT extends UITestCase {
     }
 
     @Test
+    public void testOnscreenLayer() throws InterruptedException, InvocationTargetException {
+        testOffscreenLayerPath1_Impl(false, false);
+    }
+    
+    @Test
     public void testOffscreenLayerPath1_NewtOffscreen() throws InterruptedException, InvocationTargetException {
-        testOffscreenLayerPath1_Impl(true);
+        testOffscreenLayerPath1_Impl(true, true);
     }
     
     @Test
     public void testOffscreenLayerPath1_NewtOnscreen() throws InterruptedException, InvocationTargetException {
-        testOffscreenLayerPath1_Impl(false);
+        testOffscreenLayerPath1_Impl(true, false);
     }
     
-    private void testOffscreenLayerPath1_Impl(boolean newtOffscreenClass) throws InterruptedException, InvocationTargetException {
-        if( newtOffscreenClass && !JAWTUtil.isCachedJAWTUsingOffscreenLayer() ) {
-            System.err.println("JAWT OffscreenLayer n/a on this platform.");
-            return;
-        }
+    private void testOffscreenLayerPath1_Impl(boolean offscreenLayer, boolean newtOffscreenClass) throws InterruptedException, InvocationTargetException {
         final Frame frame1 = new Frame("AWT Parent Frame");
         
         GLCapabilities glCaps = new GLCapabilities(null);
@@ -152,7 +151,8 @@ public class TestParentingOffscreenLayer01AWT extends UITestCase {
 
         GLWindow glWindow1 = GLWindow.create(glCaps);
         
-        final NewtCanvasAWT newtCanvasAWT1 = new NewtCanvasAWT(glWindow1);        
+        final NewtCanvasAWT newtCanvasAWT1 = new NewtCanvasAWT(glWindow1);
+        newtCanvasAWT1.setShallUseOffscreenLayer(offscreenLayer); // trigger offscreen layer - if supported
         newtCanvasAWT1.setPreferredSize(preferredGLSize);
         newtCanvasAWT1.setMinimumSize(minGLSize);