Seamless Integration of an FBObject based GLFBODrawable as GLOffscreenAutoDrawable.FBO and as an OffscreenLayerSurface's drawable (OSX) - Fix Bugs 569 and 599

Summary:
=========
The new FBObject based GLFBODrawable implementation allows the seamless utilization of
FBO offscreen rendering in single buffer, double buffer and MSAA mode.

The GLFBODrawable uses a parent drawable based on a
dummy surface to allow a GLOffscreenAutoDrawable.FBO creation
or a mutable surface supporting an existing offscreen layer surface (OSX CALayer).

Offscreen GLDrawable's and GLOffscreenAutoDrawable's can be selected via the
GLCapabilities. If simply !onscreen is selected in the caps instance w/o enabling FBO, PBuffer or Bitmap,
the factory will automatically choose regarding availability:
   FBO > PBuffer > Bitmap

Double buffering is supported in MSAA more (intrinsic) and explicit in non MSAA.
It is preferred when delivering resources (texture id's or framebuffer names)
to a shared GLContext.
This is demonstrated in (emulates our OSX CALayer implementation):
  TestFBOOffThreadSharedContextMix2DemosES2NEWT,
  TestFBOOnThreadSharedContext1DemoES2NEWT
and with the OSX JAWT OffscreenLayerSurface itself. FBO is the preferred choice.

+++

Offscreen drawables can be resized while maintaining a bound GLContext (e.g. w/ GLAutoDrawable).
Previously both, drawable and context, needed to be destroyed and recreated at offscreen resize.
Common implementation in GLDrawableHelper is used in the implementations
(NEWT's GLWindow, AWT GLCanvas, SWT GLCanvas).

+++

Tested:
=======

Manually run all unit tests on:
  - Linux x86_64 NVidia/AMD/Mesa3d(ES)
  - OSX x86_64 NVidia
  - Windows x86_64 NVidia
  - Android arm Mali-400/Tegra-2

No regressions.

Disclaimer:
===========
This feature is committed almost in one patch.

Both previous commits were introducing / fixing the capabilities behavior:
 90d45928186f2be99999461cfe45f76a783cc961
 9036376b7806a5fc61590bf49404eb71830de92f

I have to appologize for the huge size and impact (files and platforms) of this commit
however, I could not find a better way to inject this feature in one sane piece.

NativeWindow Details:
=====================

Complete decoupling of platform impl. detail of surfaces
implementing ProxySurface. Used to generalize dummy surfaces and EGL surfaces
on top of a native platform surface.
  - ProxySurface.UpstreamSurfaceHook -> UpstreamSurfaceHook
  - abstract class ProxySurface -> interface ProxySurface + ProxySurfaceImpl
  - Misc. implementations

JOGL Details:
=====================

FBOObject: API Change / Simplification & Usability
  - Removed reference counter to remove complexity, allow user to choose.
  - Add 'dispose' flag for detachColorbuffer(..), allowing to keep attachment alive
  - Fix equals operation of Attachment
  - Check pre-exising GL errors
  - Interface Colobuffer gets lifecycle methods
  - Add static factory methods to create Attachments w/o FBObject instance
  - Reset:
    - Clip min size to 1
    - Keep alive samplingSink, i.e. don't issue resetMSAATexture2DSink(..).
      It gets called at syncFramebuffer()/use(..) later on before actual usage.
      This allows the consumer to utilize the GL_FRONT buffer until (e.g.) swap.
  - misc bugfixes

GLOffscreenAutoDrawable: API Change
  - Reloc and interfacing
  - class com.jogamp.opengl.OffscreenAutoDrawable -> javax.media.opengl.*
    interfaces GLOffscreenAutoDrawable extends GLAutoDrawable
               GLOffscreenAutoDrawable.FBO extends GLOffscreenAutoDrawable, GLFBODrawable
  - Added general implementation and FBO specialization
  - Replacing GLPBuffer (deprecated) .. usable for any offscreen GLDrawable via factory

GLAutoDrawable:
  - Add 'GLDrawable getDelegatedDrawable()'
  - Refine documentation of setContext(..), remove disclaimer and fixme tags

GLDrawableFactory:
  - Refine API doc and it's selection mechanism for offscreen.
  - Add createOffscreenDrawable(..)
  - Add createOffscreenAutoDrawable(..)
  - Add canCreateFBO(..)
  - Mark createGLPbuffer(..) deprectated

Mark GLPBuffer deprecated

New: GLFBODrawable extends GLDrawable

GLCanvas (AWT and SWT): Add offscreen resize support w/o GLContext recreation

GLAutoDrawableBase .. GLWindow:
  - Add offscreen resize support w/o GLContext recreation
  - Remove double swapBuffer call
  -

GLBase/GLContext:
  - Add:
    - boolean hasBasicFBOSupport()
    - boolean hasFullFBOSupport()
    - int getMaxRenderbufferSamples()
    - boolean isTextureFormatBGRA8888Available()

GLContext: Fix version detection and hasGLSL()
  - Version detection in setGLFunctionAvailability(..)
    - Query GL_VERSION ASAP and parse it and compare w/ given major/minor
    - Use parsed version if valid and lower than given _or_ given is invalid.
    - Use validated version for caching (procaddr, ..), version number, etc.

  - Fix hasGLSL()
    Since 'isGL2ES2()' is true if 'isGL2()'
    and the latter simply alows GL 1.*, we confine the result to a GL >= 2.0
    on desktops. FIXME: May consider GL 1.5 w/ extensions.
    -  return isGL2ES2();
    +      return isGLES2() ||
    +             isGL3() ||
    +             isGL2() && ctxMajorVersion>1 ;

GLDrawableImpl:
  - Add 'associateContext(GLContext, boolean)' allowing impl.
    to have a (weak) reference list of bound context.
    This is was pulled up from the OSX specific drawable impl.
  - swapBuffersImpl() -> swapBuffersImpl(boolean doubleBuffered)
    and call it regardless of single buffering.
    This is required to propagate this event to impl. properly,
    i.e. FBODrawable requires a swap notification.
  - Clarify 'contextMadeCurrent(..)' protocol

GLDrawableHelper:
  - Add resize and recreate offscreen drawable util method
  - Simplify required init/reshape calls for GLEventListener
  -

GLGraphicsConfigurationUtil:
  - fixWinAttribBitsAndHwAccel: Reflect sharede context hw-accel bits
  - OSX has no offscreen bitmap, use pbuffer
  - use proper offscreen auto selection if offscreen and no modes are set

EGL Context/Drawable/DrawableFactory: Abstract native platform code out of base classes
  - Use EGLWrappedSurface w/ UpstreamSurfaceHook to handle upstream (X11, WGL, ..)
    lifecycle - in case the EGL resource is hooked up on it.

Invisible dummy surfaces: All platforms
  - size is now reduced to 64x64 and decoupled of actual generic mutable size
  - fix device  lifecycle, no more leaks

+++

OSX
====

Enable support for GLFBODrawableImpl in offscreen CALayer mode
  - NSOpenGLImpl: hooks to calayer native code
  - calayer code:
    - allows pbuffer and texures (FBO)
    - decouple size and draw calls avoiding flickering
    - enable auto resize of calayer tree

MacOSXCGLContext:
  - NSOpenGLImpl:
  - Fix false pbuffer 'usage', validate the pointer
  - If !pbuffer, copy other window mode bits of caps
  -

MacOSXCGLGraphicsConfiguration:
  - Only assume pbuffer if !onscreen
  - Remove reference of native pixelformat pointer

Native code:
  - use 'respondsToSelector:' query before calling 'new' methods
    avoiding an error message where unsuported (prev. OSX versions)
  - if monitor refresh-rate is queried 0, set to default 60hz
  - add missing NSAutoreleasePool decoration

+++

Android / NEWT:
===============

Issue setVisible(..) w/o wait, i.e. queue on EDT,
@Android surfaceChanged() callback. Otherwise we could deadlock:
   setVisible(..) -> EDT -> setVisibleImpl(..) -> 'GL-display'.
the latter may may cause havoc while Android-EDT is blocked [until it's return].

44 files changed, 1951 insertions, 1138 deletions

diff --git a/src/jogl/classes/jogamp/opengl/GLAutoDrawableBase.java b/src/jogl/classes/jogamp/opengl/GLAutoDrawableBase.java
index cc4e1b434..07029f143 100644
--- a/src/jogl/classes/jogamp/opengl/GLAutoDrawableBase.java
+++ b/src/jogl/classes/jogamp/opengl/GLAutoDrawableBase.java
@@ -30,16 +30,15 @@ package jogamp.opengl;
 
 import java.io.PrintStream;
 
-import javax.media.nativewindow.AbstractGraphicsConfiguration;
 import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.NativeSurface;
+import javax.media.nativewindow.NativeWindowException;
 import javax.media.nativewindow.WindowClosingProtocol;
 import javax.media.nativewindow.WindowClosingProtocol.WindowClosingMode;
 import javax.media.opengl.FPSCounter;
 import javax.media.opengl.GL;
 import javax.media.opengl.GLAnimatorControl;
 import javax.media.opengl.GLAutoDrawable;
-import javax.media.opengl.GLAutoDrawableDelegate;
 import javax.media.opengl.GLCapabilitiesImmutable;
 import javax.media.opengl.GLContext;
 import javax.media.opengl.GLDrawable;
@@ -49,6 +48,7 @@ import javax.media.opengl.GLProfile;
 import javax.media.opengl.GLRunnable;
 
 import com.jogamp.common.util.locks.RecursiveLock;
+import com.jogamp.opengl.GLAutoDrawableDelegate;
 import com.jogamp.opengl.util.Animator;
 
 
@@ -61,38 +61,36 @@ import com.jogamp.opengl.util.Animator;
  * @see GLWindow
  */
 public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
-    public static final boolean DEBUG = Debug.debug("GLAutoDrawable");
+    public static final boolean DEBUG = GLDrawableImpl.DEBUG;
     
     protected final GLDrawableHelper helper = new GLDrawableHelper();
     protected final FPSCounterImpl fpsCounter = new FPSCounterImpl();
     
     protected volatile GLDrawableImpl drawable; // volatile: avoid locking for read-only access
     protected GLContextImpl context;
-    protected final boolean ownDevice;
+    protected final boolean ownsDevice;
     protected int additionalCtxCreationFlags = 0;
     protected volatile boolean sendReshape = false; // volatile: maybe written by WindowManager thread w/o locking
     protected volatile boolean sendDestroy = false; // volatile: maybe written by WindowManager thread w/o locking
 
     /**
-     * @param drawable a valid {@link GLDrawableImpl}, may not be realized yet.
-     * @param context a valid {@link GLContextImpl}, may not be made current (created) yet.
-     * @param ownDevice pass <code>true</code> if {@link AbstractGraphicsDevice#close()} shall be issued,
-     *                  otherwise pass <code>false</code>. Closing the device is required in case
-     *                  the drawable is created w/ it's own new instance, e.g. offscreen drawables,
-     *                  and no further lifecycle handling is applied.
+     * @param drawable upstream {@link GLDrawableImpl} instance, may be null for lazy initialization
+     * @param context upstream {@link GLContextImpl} instance, may be null for lazy initialization
+     * @param ownsDevice pass <code>true</code> if {@link AbstractGraphicsDevice#close()} shall be issued,
+     *                   otherwise pass <code>false</code>. Closing the device is required in case
+     *                   the drawable is created w/ it's own new instance, e.g. offscreen drawables,
+     *                   and no further lifecycle handling is applied.
      */
-    public GLAutoDrawableBase(GLDrawableImpl drawable, GLContextImpl context, boolean ownDevice) {
+    public GLAutoDrawableBase(GLDrawableImpl drawable, GLContextImpl context, boolean ownsDevice) {
         this.drawable = drawable;
         this.context = context;
-        this.ownDevice = ownDevice;
+        this.ownsDevice = ownsDevice;
         resetFPSCounter();        
     }
    
+    /** Returns the recursive lock object of the upstream implementation, which synchronizes multithreaded access. */ 
     protected abstract RecursiveLock getLock();
     
-    /** Returns the delegated GLDrawable */
-    public final GLDrawable getDelegatedDrawable() { return drawable; }
-    
     /** Default implementation to handle repaint events from the windowing system */
     protected final void defaultWindowRepaintOp() {
         final GLDrawable _drawable = drawable;
@@ -103,29 +101,43 @@ public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
         }
     }
     
-    /** Default implementation to handle resize events from the windowing system */
-    protected final void defaultWindowResizedOp() {
-        final GLDrawable _drawable = drawable;
+    /** Default implementation to handle resize events from the windowing system. All required locks are being claimed. */
+    protected final void defaultWindowResizedOp(int newWidth, int newHeight) throws NativeWindowException, GLException {
+        GLDrawableImpl _drawable = drawable;
         if( null!=_drawable ) {
             if(DEBUG) {
-                System.err.println("GLAutoDrawableBase.sizeChanged: ("+Thread.currentThread().getName()+"): "+getWidth()+"x"+getHeight()+" - surfaceHandle 0x"+Long.toHexString(getNativeSurface().getSurfaceHandle()));
+                System.err.println("GLAutoDrawableBase.sizeChanged: ("+Thread.currentThread().getName()+"): "+newWidth+"x"+newHeight+" - surfaceHandle 0x"+Long.toHexString(getNativeSurface().getSurfaceHandle()));
+            }
+            if( ! _drawable.getChosenGLCapabilities().isOnscreen() ) {
+                final RecursiveLock _lock = getLock();
+                _lock.lock();
+                try {
+                    final GLDrawableImpl _drawableNew = GLDrawableHelper.resizeOffscreenDrawable(_drawable, context, newWidth, newHeight);
+                    if(_drawable != _drawableNew) {
+                        // write back 
+                        _drawable = _drawableNew;
+                        drawable = _drawableNew;
+                    }
+                } finally {
+                    _lock.unlock();
+                }
             }
             sendReshape = true; // async if display() doesn't get called below, but avoiding deadlock
             if( _drawable.isRealized() ) {
                 if( !_drawable.getNativeSurface().isSurfaceLockedByOtherThread() && !helper.isAnimatorAnimating() ) {
                     display();
                 }
-            }        
+            }
         }
     }
-
+    
     /** 
      * Default implementation to handle destroy notifications from the windowing system.
      * 
      * <p>
      * If the {@link NativeSurface} does not implement {@link WindowClosingProtocol} 
      * or {@link WindowClosingMode#DISPOSE_ON_CLOSE} is enabled (default),
-     * {@link #defaultDestroy()} is being called.
+     * a thread safe destruction is being induced.
      * </p> 
      */
     protected final void defaultWindowDestroyNotifyOp() {
@@ -174,7 +186,7 @@ public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
                 ctrl.resume();
             }
         } else if (null != ns && ns.isSurfaceLockedByOtherThread()) {
-            // surface is locked by another thread
+            // Surface is locked by another thread.
             // Flag that destroy should be performed on the next
             // attempt to display.
             sendDestroy = true; // async, but avoiding deadlock
@@ -225,7 +237,7 @@ public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
                 }
                 _drawable.setRealized(false);
             }
-            if( ownDevice ) {
+            if( ownsDevice ) {
                 _drawable.getNativeSurface().getGraphicsConfiguration().getScreen().getDevice().close();
             }
         }
@@ -238,7 +250,6 @@ public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
         _lock.lock();
         try {            
             if(drawable!=null && context != null) {
-                drawable.swapBuffers();
                 helper.invokeGL(drawable, context, defaultSwapAction, defaultInitAction);
             }
         } finally {
@@ -276,7 +287,7 @@ public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
             destroy();
             return;
         }
-        final RecursiveLock _lock = getLock();        
+        final RecursiveLock _lock = getLock();
         _lock.lock();
         try {
             if( null != context ) {
@@ -295,6 +306,11 @@ public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
         } } ;
         
     @Override
+    public final GLDrawable getDelegatedDrawable() {
+        return drawable;
+    }
+    
+    @Override
     public final GLContext getContext() {
         return context;
     }
@@ -305,7 +321,7 @@ public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
         lock.lock();
         try {
             final GLContext oldCtx = context;
-            final boolean newCtxCurrent = helper.switchContext(drawable, oldCtx, newCtx, additionalCtxCreationFlags);
+            final boolean newCtxCurrent = GLDrawableHelper.switchContext(drawable, oldCtx, newCtx, additionalCtxCreationFlags);
             context=(GLContextImpl)newCtx;
             if(newCtxCurrent) {
                 context.makeCurrent();
@@ -529,4 +545,10 @@ public abstract class GLAutoDrawableBase implements GLAutoDrawable, FPSCounter {
         final GLDrawable _drawable = drawable;
         return null != _drawable ? _drawable.getHandle() : 0;
     }
+    
+    @Override
+    public String toString() {
+        return getClass().getSimpleName()+"[ \n\tHelper: " + helper + ", \n\tDrawable: " + drawable +
+               ", \n\tContext: " + context + /** ", \n\tWindow: "+window+ ", \n\tFactory: "+factory+ */ "]";
+    }
 }
diff --git a/src/jogl/classes/jogamp/opengl/GLContextImpl.java b/src/jogl/classes/jogamp/opengl/GLContextImpl.java
index e82756022..050c619fd 100644
--- a/src/jogl/classes/jogamp/opengl/GLContextImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLContextImpl.java
@@ -47,6 +47,7 @@ import java.util.Map;
 
 import com.jogamp.common.os.DynamicLookupHelper;
 import com.jogamp.common.util.ReflectionUtil;
+import com.jogamp.common.util.VersionNumber;
 import com.jogamp.gluegen.runtime.FunctionAddressResolver;
 import com.jogamp.gluegen.runtime.ProcAddressTable;
 import com.jogamp.gluegen.runtime.opengl.GLNameResolver;
@@ -85,6 +86,7 @@ public abstract class GLContextImpl extends GLContext {
 
   private String glRenderer;
   private String glRendererLowerCase;
+  private String glVersion;
 
   // Tracks creation and initialization of buffer objects to avoid
   // repeated glGet calls upon glMapBuffer operations
@@ -126,6 +128,9 @@ public abstract class GLContextImpl extends GLContext {
     GLContextShareSet.synchronizeBufferObjectSharing(shareWith, this);
 
     this.drawable = drawable;
+    if(null != drawable) {
+        drawable.associateContext(this, true);
+    }
     this.drawableRead = drawable;
 
     this.glDebugHandler = new GLDebugMessageHandler(this);
@@ -205,8 +210,10 @@ public abstract class GLContextImpl extends GLContext {
     if(!setWriteOnly || drawableRead==drawable) { // if !setWriteOnly || !explicitReadDrawable
         drawableRead = (GLDrawableImpl) readWrite;
     }
-    final GLDrawable old = drawable;
+    final GLDrawableImpl old = drawable;
+    old.associateContext(this, false);
     drawable = (GLDrawableImpl) readWrite ;
+    drawable.associateContext(this, true);
     if(lockHeld) {
         makeCurrent();
     }
@@ -272,7 +279,7 @@ public abstract class GLContextImpl extends GLContext {
         if( actualRelease ) {
             if( !inDestruction ) {
                 try {
-                    drawable.contextMadeCurrent(this, false);
+                    contextMadeCurrent(false);
                 } catch (Throwable t) {
                     drawableContextMadeCurrentException = t;
                 }
@@ -331,7 +338,8 @@ public abstract class GLContextImpl extends GLContext {
                       makeCurrent();
                   }
                   try {
-                      drawable.contextRealized(this, false);
+                      contextRealized(false);
+                      drawable.associateContext(this, false);
                   } catch (Throwable t) {
                       drawableContextRealizedException = t;
                   }
@@ -514,19 +522,17 @@ public abstract class GLContextImpl extends GLContext {
             gl = gl.getContext().setGL( GLPipelineFactory.create("javax.media.opengl.Trace", null, gl, new Object[] { System.err } ) );
         }
         
-        drawable.contextRealized(this, true);
+        contextRealized(true);
         
         if(DEBUG || TRACE_SWITCH) {
             System.err.println(getThreadName() +": GLContext.ContextSwitch: obj " + toHexString(hashCode()) + ", ctx "+toHexString(contextHandle)+" - switch - CONTEXT_CURRENT_NEW - "+lock);
         }
-      } else {
-        drawable.contextMadeCurrent(this, true);
-        
-        if(TRACE_SWITCH) {
-            System.err.println(getThreadName() +": GLContext.ContextSwitch: obj " + toHexString(hashCode()) + ", ctx "+toHexString(contextHandle)+" - switch - CONTEXT_CURRENT - "+lock);
-        }
+      } else if(TRACE_SWITCH) {
+         System.err.println(getThreadName() +": GLContext.ContextSwitch: obj " + toHexString(hashCode()) + ", ctx "+toHexString(contextHandle)+" - switch - CONTEXT_CURRENT - "+lock);
       }
 
+      contextMadeCurrent(true);
+      
       /* FIXME: refactor dependence on Java 2D / JOGL bridge
 
       // Try cleaning up any stale server-side OpenGL objects
@@ -609,6 +615,20 @@ public abstract class GLContextImpl extends GLContext {
   protected abstract void makeCurrentImpl() throws GLException;
 
   /**
+   * @see GLDrawableImpl#contextRealized(GLContext, boolean) 
+   */ 
+  protected void contextRealized(boolean realized) {
+      drawable.contextRealized(this, realized);
+  }
+  
+  /**
+   * @see GLDrawableImpl#contextMadeCurrent(GLContext, boolean) 
+   */ 
+  protected void contextMadeCurrent(boolean current) {
+      drawable.contextMadeCurrent(this, current);      
+  }
+
+  /**
    * Platform dependent entry point for context creation.<br>
    *
    * This method is called from {@link #makeCurrentWithinLock()} .. {@link #makeCurrent()} .<br>
@@ -934,52 +954,43 @@ public abstract class GLContextImpl extends GLContext {
 
   /**
    * If major > 0 || minor > 0 : Use passed values, determined at creation time
-   * If major==0 && minor == 0 : Use GL_VERSION
    * Otherwise .. don't touch ..
    */
   private final void setContextVersion(int major, int minor, int ctp, boolean setVersionString) {
-      if (0==ctp) {
+      if ( 0 == ctp ) {
         throw new GLException("Invalid GL Version "+major+"."+minor+", ctp "+toHexString(ctp));
       }
-      if(major>0 || minor>0) {
-          if (!GLContext.isValidGLVersion(major, minor)) {
-            GLException e = new GLException("Invalid GL Version "+major+"."+minor+", ctp "+toHexString(ctp));
-            throw e;
-          }
-          ctxMajorVersion = major;
-          ctxMinorVersion = minor;
-          ctxOptions = ctp;
-          if(setVersionString) {
-              ctxVersionString = getGLVersion(ctxMajorVersion, ctxMinorVersion, ctxOptions, getGL().glGetString(GL.GL_VERSION));
-          }
-          return;
+      
+      if (!GLContext.isValidGLVersion(major, minor)) {
+        throw new GLException("Invalid GL Version "+major+"."+minor+", ctp "+toHexString(ctp));
       }
-
-      if(major==0 && minor==0) {
-          String versionStr = getGL().glGetString(GL.GL_VERSION);
-          if(null==versionStr) {
-            throw new GLException("GL_VERSION is NULL: "+this);
-          }
-          ctxOptions = ctp;
-
-          // Set version
-          GLVersionNumber version = new GLVersionNumber(versionStr);
+      ctxMajorVersion = major;
+      ctxMinorVersion = minor;
+      ctxOptions = ctp;
+      if(setVersionString) {
+          ctxVersionString = getGLVersion(ctxMajorVersion, ctxMinorVersion, ctxOptions, getGL().glGetString(GL.GL_VERSION));
+      }
+  }
+  
+  private static final VersionNumber getGLVersionNumber(int ctp, String glVersionStr) {
+      if( null != glVersionStr ) {
+          final GLVersionNumber version = new GLVersionNumber(glVersionStr);
           if (version.isValid()) {
-            ctxMajorVersion = version.getMajor();
-            ctxMinorVersion = version.getMinor();
-            // We cannot promote a non ARB context to >= 3.1,
-            // reduce it to 3.0 then.
-            if ( ( ctxMajorVersion>3 || ctxMajorVersion==3 && ctxMinorVersion>=1 )
-                 && 0 == (ctxOptions & CTX_IS_ARB_CREATED) ) {
-                ctxMajorVersion = 3;
-                ctxMinorVersion = 0;
-            }
-            if(setVersionString) {
-                ctxVersionString = getGLVersion(ctxMajorVersion, ctxMinorVersion, ctxOptions, versionStr);
-            }
-            return;
+              int major = version.getMajor();
+              int minor = version.getMinor();
+              // We cannot promote a non ARB context to >= 3.1,
+              // reduce it to 3.0 then.
+              if ( 0 == (ctp & CTX_IS_ARB_CREATED) && 
+                   ( major > 3 || major == 3 && minor >= 1 ) ) {
+                  major = 3;
+                  minor = 0;
+              }
+              if ( GLContext.isValidGLVersion(major, minor) ) {
+                  return new VersionNumber(major, minor, 0);
+              }
           }
       }
+      return null;      
   }
 
   //----------------------------------------------------------------------
@@ -1019,14 +1030,18 @@ public abstract class GLContextImpl extends GLContext {
   /**
    * Pbuffer support; given that this is a GLContext associated with a
    * pbuffer, binds this pbuffer to its texture target.
+   * @throws GLException if not implemented (default)
+   * @deprecated use FBO/GLOffscreenAutoDrawable instead of pbuffer
    */
-  public abstract void bindPbufferToTexture();
+  public void bindPbufferToTexture() { throw new GLException("not implemented"); }
 
   /**
    * Pbuffer support; given that this is a GLContext associated with a
    * pbuffer, releases this pbuffer from its texture target.
+   * @throws GLException if not implemented (default)
+   * @deprecated use FBO/GLOffscreenAutoDrawable instead of pbuffer
    */
-  public abstract void releasePbufferFromTexture();
+  public void releasePbufferFromTexture() { throw new GLException("not implemented"); }
 
   public abstract ByteBuffer glAllocateMemoryNV(int arg0, float arg1, float arg2, float arg3);
 
@@ -1064,7 +1079,7 @@ public abstract class GLContextImpl extends GLContext {
     table.reset(getDrawableImpl().getGLDynamicLookupHelper() );
   }
 
-  private final boolean initGLRendererStrings()  {
+  private final boolean initGLRendererAndGLVersionStrings()  {
     final GLDynamicLookupHelper glDynLookupHelper = getDrawableImpl().getGLDynamicLookupHelper();
     final long _glGetString = glDynLookupHelper.dynamicLookupFunction("glGetString");
     if(0 == _glGetString) {
@@ -1083,14 +1098,27 @@ public abstract class GLContextImpl extends GLContext {
                 Thread.dumpStack();
             }
             return false;
-        } else {
-            glRenderer = _glRenderer;
-            glRendererLowerCase = glRenderer.toLowerCase();
-            return true;
         }
+        glRenderer = _glRenderer;
+        glRendererLowerCase = glRenderer.toLowerCase();
+        
+        final String _glVersion = glGetStringInt(GL.GL_VERSION, _glGetString);
+        if(null == _glVersion) {
+            // FIXME
+            if(DEBUG) {
+                System.err.println("Warning: GL_VERSION is NULL.");
+                Thread.dumpStack();
+            }
+            return false;
+        }
+        glVersion = _glVersion;
+        return true;
     }
   }
 
+  protected final String getGLVersionString() {
+      return glVersion;
+  }
   protected final String getGLRendererString(boolean lowerCase) {
       return lowerCase ? glRendererLowerCase : glRenderer;
   }
@@ -1128,17 +1156,44 @@ public abstract class GLContextImpl extends GLContext {
     final AbstractGraphicsConfiguration aconfig = drawable.getNativeSurface().getGraphicsConfiguration();
     final AbstractGraphicsDevice adevice = aconfig.getScreen().getDevice();
     
-    if( !initGLRendererStrings() && DEBUG) {
-        System.err.println("Warning: intialization of GL renderer strings failed. "+adevice+" - "+GLContext.getGLVersion(major, minor, ctxProfileBits, null));
+    {
+        final boolean initGLRendererAndGLVersionStringsOK = initGLRendererAndGLVersionStrings();
+        if(DEBUG) {
+            if( !initGLRendererAndGLVersionStringsOK ) {
+                System.err.println("Warning: setGLFunctionAvailability: intialization of GL renderer strings failed. "+adevice+" - "+GLContext.getGLVersion(major, minor, ctxProfileBits, null));
+            } else {
+                System.err.println(getThreadName() + ": GLContext.setGLFuncAvail: Given "+adevice+" - "+GLContext.getGLVersion(major, minor, ctxProfileBits, glVersion));
+            }
+        }
     }
 
     if(!isCurrentContextHardwareRasterizer()) {
         ctxProfileBits |= GLContext.CTX_IMPL_ACCEL_SOFT;
     }
-
+    
+    // Pick the version from the GL-version string, 
+    // if smaller _or_ given major == 0.
+    final VersionNumber glVersionNumber;
+    {
+        final VersionNumber setGLVersionNumber = new VersionNumber(major, minor, 0);
+        final VersionNumber strGLVersionNumber = getGLVersionNumber(ctxProfileBits, glVersion);
+        if( null != strGLVersionNumber && ( strGLVersionNumber.compareTo(setGLVersionNumber) <= 0 || 0 == major ) ) {
+            glVersionNumber = strGLVersionNumber;
+            major = glVersionNumber.getMajor();
+            minor = glVersionNumber.getMinor();
+        } else {
+            glVersionNumber = setGLVersionNumber;
+        }
+    }
+    if ( !GLContext.isValidGLVersion(major, minor) ) {
+        throw new GLException("Invalid GL Version "+major+"."+minor+", ctp "+toHexString(ctxProfileBits)+", "+glVersion+", "+glVersionNumber);
+    }
+    if( 2 > major ) { // there is no ES2-compat for a profile w/ major < 2
+        ctxProfileBits &= ~GLContext.CTX_IMPL_ES2_COMPAT;
+    }
     contextFQN = getContextFQN(adevice, major, minor, ctxProfileBits);
     if (DEBUG) {
-      System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.0 FQN: "+contextFQN+" - "+GLContext.getGLVersion(major, minor, ctxProfileBits, null));
+        System.err.println(getThreadName() + ": GLContext.setGLFuncAvail.0 validated FQN: "+contextFQN+" - "+GLContext.getGLVersion(major, minor, ctxProfileBits, glVersion) + ", "+glVersionNumber);
     }
 
     //
@@ -1201,6 +1256,10 @@ public abstract class GLContextImpl extends GLContext {
         ctxProfileBits |= CTX_IMPL_FBO;
     }
     
+    if(FORCE_NO_FBO_SUPPORT) {
+        ctxProfileBits &= ~CTX_IMPL_FBO ;
+    }      
+    
     //
     // Set GL Version (complete w/ version string)
     //
diff --git a/src/jogl/classes/jogamp/opengl/GLDrawableFactoryImpl.java b/src/jogl/classes/jogamp/opengl/GLDrawableFactoryImpl.java
index e1e253d35..4f965f620 100644
--- a/src/jogl/classes/jogamp/opengl/GLDrawableFactoryImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLDrawableFactoryImpl.java
@@ -48,18 +48,21 @@ import javax.media.nativewindow.NativeWindowFactory;
 import javax.media.nativewindow.OffscreenLayerSurface;
 import javax.media.nativewindow.ProxySurface;
 import javax.media.nativewindow.MutableSurface;
-import javax.media.nativewindow.ProxySurface.UpstreamSurfaceHook;
-import javax.media.opengl.GLCapabilities;
+import javax.media.nativewindow.UpstreamSurfaceHook;
 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.GLFBODrawable;
+import javax.media.opengl.GLOffscreenAutoDrawable;
 import javax.media.opengl.GLPbuffer;
 import javax.media.opengl.GLProfile;
 
 import com.jogamp.nativewindow.MutableGraphicsConfiguration;
+import com.jogamp.nativewindow.DelegatedUpstreamSurfaceHookWithSurfaceSize;
+import com.jogamp.nativewindow.UpstreamSurfaceHookMutableSize;
 
 
 /** Extends GLDrawableFactory with a few methods for handling
@@ -67,6 +70,7 @@ import com.jogamp.nativewindow.MutableGraphicsConfiguration;
     Independent Bitmaps on Windows, pixmaps on X11). Direct access to
     these GLDrawables is not supplied directly to end users, though
     they may be instantiated by the GLJPanel implementation. */
+@SuppressWarnings("deprecation")
 public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
   protected static final boolean DEBUG = GLDrawableImpl.DEBUG;
 
@@ -141,55 +145,53 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
         final OffscreenLayerSurface ols = NativeWindowFactory.getOffscreenLayerSurface(target, true);
         if(null != ols) {
             // layered surface -> Offscreen/[FBO|PBuffer]
-            final GLCapabilities chosenCapsMod = (GLCapabilities) chosenCaps.cloneMutable();
-            chosenCapsMod.setOnscreen(false);
-            chosenCapsMod.setDoubleBuffered(false);
-            /* if( isFBOAvailable ) { // FIXME JAU: FBO n/a yet
-                chosenCapsMod.setFBO(true);
-            } else */ 
-            if( canCreateGLPbuffer(adevice) ) {
-                chosenCapsMod.setPBuffer(true);
-            } else {
-                chosenCapsMod.setFBO(false);
-                chosenCapsMod.setPBuffer(false);
+            final boolean isPbufferAvailable = canCreateGLPbuffer(adevice) ;
+            if(!isPbufferAvailable && !isFBOAvailable) {
+                throw new GLException("Neither FBO nor Pbuffer is available for "+target);
             }
+            final GLCapabilitiesImmutable chosenCapsMod = GLGraphicsConfigurationUtil.fixOffscreenGLCapabilities(chosenCaps, isFBOAvailable, isPbufferAvailable);
             config.setChosenCapabilities(chosenCapsMod);
+            ols.setChosenCapabilities(chosenCapsMod);
             if(DEBUG) {
-                System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OnscreenDrawable -> Offscreen-Layer: "+target);
+                System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OnscreenDrawable -> Offscreen-Layer");
+                System.err.println("chosenCaps: "+chosenCaps);
+                System.err.println("chosenCapsMod: "+chosenCapsMod);
+                System.err.println("OffscreenLayerSurface: **** "+ols);
+                System.err.println("Target: **** "+target);
+                Thread.dumpStack();
             }
             if( ! ( target instanceof MutableSurface ) ) {
                 throw new IllegalArgumentException("Passed NativeSurface must implement SurfaceChangeable for offscreen layered surface: "+target);
             }            
-            if( ((GLCapabilitiesImmutable)config.getRequestedCapabilities()).isFBO() && isFBOAvailable ) {
-                // FIXME JAU: Need to revise passed MutableSurface to work w/ FBO ..
-                final GLDrawableImpl dummyDrawable = createOnscreenDrawableImpl(target);                
-                result = new GLFBODrawableImpl(this, dummyDrawable, target, target.getWidth(), target.getHeight(), 0 /* textureUnit */);
+            if( chosenCapsMod.isFBO() && isFBOAvailable ) {
+                // target surface is already a native one
+                result = createFBODrawableImpl(target, chosenCapsMod, 0);
             } else {            
                 result = createOffscreenDrawableImpl(target);
             }
         } else if(chosenCaps.isOnscreen()) {
             // onscreen
+            final GLCapabilitiesImmutable chosenCapsMod = GLGraphicsConfigurationUtil.fixOnscreenGLCapabilities(chosenCaps);
+            config.setChosenCapabilities(chosenCapsMod);
             if(DEBUG) {
                 System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OnscreenDrawable: "+target);
             }
             result = createOnscreenDrawableImpl(target);
         } else {
             // offscreen
-            final GLCapabilitiesImmutable reqCaps = (GLCapabilitiesImmutable)config.getRequestedCapabilities();
             if(DEBUG) {
-                System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OffScreenDrawable, FBO req / chosen - avail, PBuffer: "+reqCaps.isFBO()+" / "+chosenCaps.isFBO()+" - "+isFBOAvailable+", "+chosenCaps.isPBuffer()+": "+target);
+                System.err.println("GLDrawableFactoryImpl.createGLDrawable -> OffScreenDrawable, FBO chosen / avail, PBuffer: "+
+                                   chosenCaps.isFBO()+" / "+isFBOAvailable+", "+chosenCaps.isPBuffer()+": "+target);
             }
             if( ! ( target instanceof MutableSurface ) ) {
-                throw new IllegalArgumentException("Passed NativeSurface must implement SurfaceChangeable for offscreen: "+target);
+                throw new IllegalArgumentException("Passed NativeSurface must implement MutableSurface for offscreen: "+target);
             }
-            if( reqCaps.isFBO() && isFBOAvailable ) {
-                // FIXME JAU: Need to revise passed MutableSurface to work w/ FBO ..
-                final GLDrawableImpl dummyDrawable = createOnscreenDrawableImpl(target);                
-                result = new GLFBODrawableImpl(this, dummyDrawable, target, target.getWidth(), target.getHeight(), 0 /* textureUnit */);
+            if( chosenCaps.isFBO() && isFBOAvailable ) {
+                // need to hook-up a native dummy surface since source may not have
+                final ProxySurface dummySurface = createDummySurfaceImpl(adevice, true, chosenCaps, null, 64, 64);
+                dummySurface.setUpstreamSurfaceHook(new DelegatedUpstreamSurfaceHookWithSurfaceSize(dummySurface.getUpstreamSurfaceHook(), target));
+                result = createFBODrawableImpl(dummySurface, chosenCaps, 0);
             } else {
-                final GLCapabilities chosenCapsMod = (GLCapabilities) chosenCaps.cloneMutable();
-                chosenCapsMod.setDoubleBuffered(false);
-                config.setChosenCapabilities(chosenCapsMod);
                 result = createOffscreenDrawableImpl(target);
             }
         }
@@ -211,7 +213,7 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
 
   //---------------------------------------------------------------------------
   //
-  // PBuffer Offscreen GLDrawable construction
+  // PBuffer Offscreen GLAutoDrawable construction
   //
   
   @Override
@@ -239,7 +241,8 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
     GLDrawableImpl drawable = null;
     device.lock();
     try {
-        drawable = (GLDrawableImpl) createGLDrawable( createMutableSurfaceImpl(device, true, capsChosen, capsRequested, chooser, width, height, null) );
+        drawable = createOffscreenDrawableImpl( createMutableSurfaceImpl(device, true, capsChosen, capsRequested, chooser, 
+                                                                     new UpstreamSurfaceHookMutableSize(width, height) ) );
         if(null != drawable) {
             drawable.setRealized(true);
         }
@@ -247,10 +250,7 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
         device.unlock();
     }
 
-    if(null==drawable) {
-        throw new GLException("Could not create Pbuffer drawable for: "+device+", "+capsChosen+", "+width+"x"+height);
-    }
-    return new GLPbufferImpl( drawable, shareWith, true);
+    return new GLPbufferImpl( drawable, (GLContextImpl) drawable.createContext(shareWith) );
   }
 
   //---------------------------------------------------------------------------
@@ -258,6 +258,29 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
   // Offscreen GLDrawable construction
   //
 
+  public final boolean canCreateFBO(AbstractGraphicsDevice deviceReq, GLProfile glp) {
+    AbstractGraphicsDevice device = getOrCreateSharedDevice(deviceReq);
+    if(null == device) {
+        throw new GLException("No shared device for requested: "+deviceReq);
+    }
+    return GLContext.isFBOAvailable(device, glp);      
+  }
+  
+  @Override
+  public GLOffscreenAutoDrawable createOffscreenAutoDrawable(AbstractGraphicsDevice deviceReq,
+                                                             GLCapabilitiesImmutable capsRequested,
+                                                             GLCapabilitiesChooser chooser,
+                                                             int width, int height,
+                                                             GLContext shareWith) {
+    final GLDrawable drawable = createOffscreenDrawable( deviceReq, capsRequested, chooser, width, height ); 
+    drawable.setRealized(true);
+    final GLContext context = drawable.createContext(shareWith);
+    if(drawable instanceof GLFBODrawableImpl) {
+        return new GLOffscreenAutoDrawableImpl.FBOImpl( (GLFBODrawableImpl)drawable, context, null, null );
+    }
+    return new GLOffscreenAutoDrawableImpl( drawable, context, null, null);
+  }
+  
   @Override
   public GLDrawable createOffscreenDrawable(AbstractGraphicsDevice deviceReq,
                                             GLCapabilitiesImmutable capsRequested,
@@ -274,10 +297,13 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
     final GLCapabilitiesImmutable capsChosen = GLGraphicsConfigurationUtil.fixOffscreenGLCapabilities(capsRequested, 
                                                         GLContext.isFBOAvailable(device, capsRequested.getGLProfile()), 
                                                         canCreateGLPbuffer(device));    
+
     if( capsChosen.isFBO() ) {
         device.lock();
         try {
-            return createFBODrawableImpl(device, capsRequested, chooser, width, height);
+            final ProxySurface dummySurface = createDummySurfaceImpl(device, true, capsRequested, null, width, height);
+            final GLDrawableImpl dummyDrawable = createOnscreenDrawableImpl(dummySurface);    
+            return new GLFBODrawableImpl.ResizeableImpl(this, dummyDrawable, dummySurface, capsChosen, 0);
         } finally {
             device.unlock();
         }
@@ -285,20 +311,17 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
     
     device.lock();
     try {
-        return createOffscreenDrawableImpl( createMutableSurfaceImpl(device, true, capsChosen, capsRequested, chooser, width, height, null) );
+        return createOffscreenDrawableImpl( createMutableSurfaceImpl(device, true, capsChosen, capsRequested, chooser, 
+                                                                     new UpstreamSurfaceHookMutableSize(width, height) ) );
     } finally {
         device.unlock();
     }
   }
 
-  /** Creates a platform independent offscreen FBO GLDrawable implementation */  
-  protected GLDrawable createFBODrawableImpl(AbstractGraphicsDevice device, GLCapabilitiesImmutable requestedCaps, GLCapabilitiesChooser chooser, 
-                                            int initialWidth, int initialHeight) {    
-    final GLCapabilitiesImmutable dummyCaps = GLGraphicsConfigurationUtil.fixOnscreenGLCapabilities(requestedCaps);
-    final NativeSurface dummySurface = createDummySurfaceImpl(device, true, dummyCaps, null, 64, 64);
+  /** Creates a platform independent FBO offscreen GLDrawable */ 
+  protected GLFBODrawable createFBODrawableImpl(NativeSurface dummySurface, GLCapabilitiesImmutable fboCaps, int textureUnit) {
     final GLDrawableImpl dummyDrawable = createOnscreenDrawableImpl(dummySurface);
-    
-    return new GLFBODrawableImpl(this, dummyDrawable, dummySurface, initialWidth, initialHeight, 0 /* textureUnit */);
+    return new GLFBODrawableImpl(this, dummyDrawable, dummySurface, fboCaps, textureUnit);
   }
   
   /** Creates a platform dependent offscreen pbuffer/pixmap GLDrawable implementation */  
@@ -318,15 +341,13 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
    * @param capsChosen
    * @param capsRequested
    * @param chooser the custom chooser, may be null for default
-   * @param width the initial width
-   * @param height the initial height
-   * @param lifecycleHook optional control of the surface's lifecycle 
+   * @param upstreamHook surface size information and optional control of the surface's lifecycle 
    * @return the created {@link MutableSurface} instance w/o defined surface handle
    */
   protected abstract ProxySurface createMutableSurfaceImpl(AbstractGraphicsDevice device, boolean createNewDevice, 
                                                            GLCapabilitiesImmutable capsChosen,
                                                            GLCapabilitiesImmutable capsRequested,
-                                                           GLCapabilitiesChooser chooser, int width, int height, UpstreamSurfaceHook lifecycleHook);
+                                                           GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstreamHook);
 
   /**
    * A dummy surface is not visible on screen and will not be used to render directly to,
@@ -341,9 +362,9 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
    * @param width the initial width
    * @param height the initial height
    *
-   * @return the created {@link MutableSurface} instance w/o defined surface handle
+   * @return the created {@link ProxySurface} instance w/o defined surface handle but platform specific {@link UpstreamSurfaceHook}.
    */
-  public NativeSurface createDummySurface(AbstractGraphicsDevice deviceReq, GLCapabilitiesImmutable requestedCaps, GLCapabilitiesChooser chooser,
+  public ProxySurface createDummySurface(AbstractGraphicsDevice deviceReq, GLCapabilitiesImmutable requestedCaps, GLCapabilitiesChooser chooser,
                                           int width, int height) {
     final AbstractGraphicsDevice device = getOrCreateSharedDevice(deviceReq);
     if(null == device) {
@@ -369,9 +390,11 @@ public abstract class GLDrawableFactoryImpl extends GLDrawableFactory {
    *                        otherwise <code>device</code> instance is used as-is.
    * @param requestedCaps
    * @param chooser the custom chooser, may be null for default
-   * @param width the initial width
-   * @param height the initial height
-   * @return the created {@link MutableSurface} instance w/o defined surface handle
+   * @param width the initial width as returned by {@link NativeSurface#getWidth()}, not the actual dummy surface width. 
+   *        The latter is platform specific and small
+   * @param height the initial height as returned by {@link NativeSurface#getHeight()}, not the actual dummy surface height,
+   *        The latter is platform specific and small
+   * @return the created {@link ProxySurface} instance w/o defined surface handle but platform specific {@link UpstreamSurfaceHook}.
    */
   public abstract ProxySurface createDummySurfaceImpl(AbstractGraphicsDevice device, boolean createNewDevice, 
                                                       GLCapabilitiesImmutable requestedCaps, GLCapabilitiesChooser chooser, int width, int height);
diff --git a/src/jogl/classes/jogamp/opengl/GLDrawableHelper.java b/src/jogl/classes/jogamp/opengl/GLDrawableHelper.java
index 090c5fe69..bdf0b6d74 100644
--- a/src/jogl/classes/jogamp/opengl/GLDrawableHelper.java
+++ b/src/jogl/classes/jogamp/opengl/GLDrawableHelper.java
@@ -43,12 +43,19 @@ package jogamp.opengl;
 import java.util.ArrayList;
 import java.util.HashSet;
 
+import javax.media.nativewindow.NativeSurface;
+import javax.media.nativewindow.NativeWindowException;
+import javax.media.nativewindow.ProxySurface;
+import javax.media.nativewindow.UpstreamSurfaceHook;
 import javax.media.opengl.GLAnimatorControl;
 import javax.media.opengl.GLAutoDrawable;
+import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLContext;
 import javax.media.opengl.GLDrawable;
+import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLEventListener;
 import javax.media.opengl.GLException;
+import javax.media.opengl.GLFBODrawable;
 import javax.media.opengl.GLRunnable;
 
 import com.jogamp.opengl.util.Animator;
@@ -108,24 +115,27 @@ public class GLDrawableHelper {
   /**
    * Associate a new context to the drawable and also propagates the context/drawable switch by 
    * calling {@link GLContext#setGLDrawable(GLDrawable, boolean) newCtx.setGLDrawable(drawable, true);}.
-   * <p>
-   * If the old context's drawable was an {@link GLAutoDrawable}, it's reference to the given drawable
-   * is being cleared by calling 
-   * {@link GLAutoDrawable#setContext(GLContext) ((GLAutoDrawable)oldCtx.getGLDrawable()).setContext(null)}.
-   * </p>
    * <p> 
    * If the old or new context was current on this thread, it is being released before switching the drawable.
    * </p>
+   * <p>
+   * Be aware that the old context is still bound to the drawable, 
+   * and that one context can only bound to one drawable at one time! 
+   * </p>
+   * <p>
+   * No locking is being performed on the drawable, caller is required to take care of it.
+   * </p>
    * 
    * @param drawable the drawable which context is changed
-   * @param newCtx the new context
    * @param oldCtx the old context
-   * @return true if the newt context was current, otherwise false
+   * @param newCtx the new context
+   * @param newCtxCreationFlags additional creation flags if newCtx is not null and not been created yet, see {@link GLContext#setContextCreationFlags(int)}
+   * @return true if the new context was current, otherwise false
    *  
    * @see GLAutoDrawable#setContext(GLContext)
    */
-  public final boolean switchContext(GLDrawable drawable, GLContext oldCtx, GLContext newCtx, int additionalCtxCreationFlags) {
-      if(null != oldCtx && oldCtx.isCurrent()) {
+  public static final boolean switchContext(GLDrawable drawable, GLContext oldCtx, GLContext newCtx, int newCtxCreationFlags) {
+      if( null != oldCtx && oldCtx.isCurrent() ) {
           oldCtx.release();
       }
       final boolean newCtxCurrent;
@@ -134,17 +144,135 @@ public class GLDrawableHelper {
           if(newCtxCurrent) {
               newCtx.release();
           }
-          newCtx.setContextCreationFlags(additionalCtxCreationFlags);
+          newCtx.setContextCreationFlags(newCtxCreationFlags);
           newCtx.setGLDrawable(drawable, true); // propagate context/drawable switch
       } else {
           newCtxCurrent = false;
       }
-      if(null!=oldCtx && oldCtx.getGLDrawable() instanceof GLAutoDrawable) {
-          ((GLAutoDrawable)oldCtx.getGLDrawable()).setContext(null);
-      }
       return newCtxCurrent;
   }
   
+  /**
+   * If the drawable is not realized, OP is a NOP.
+   * <ul> 
+   *  <li>release context if current</li>
+   *  <li>destroy old drawable</li>
+   *  <li>create new drawable</li>
+   *  <li>attach new drawable to context</li>
+   *  <li>make context current, if it was current</li>
+   * </ul>
+   * <p>
+   * No locking is being performed, caller is required to take care of it.
+   * </p>
+   * 
+   * @param drawable
+   * @param context maybe null
+   * @return the new drawable
+   */
+  public static final GLDrawableImpl recreateGLDrawable(GLDrawableImpl drawable, GLContext context) {      
+      if( ! drawable.isRealized() ) {
+          return drawable;
+      }
+      final boolean contextCurrent = null != context && context.isCurrent();
+      final GLDrawableFactory factory = drawable.getFactory();
+      final NativeSurface surface = drawable.getNativeSurface();
+      final ProxySurface proxySurface = (surface instanceof ProxySurface) ? (ProxySurface)surface : null;
+      
+      if(contextCurrent) {
+          context.release();
+      }
+      
+      if(null != proxySurface) {
+          proxySurface.enableUpstreamSurfaceHookLifecycle(false);
+      }
+      try {
+          drawable.setRealized(false);
+          drawable = (GLDrawableImpl) factory.createGLDrawable(surface); // [2]
+          drawable.setRealized(true);
+      } finally {
+          if(null != proxySurface) {
+              proxySurface.enableUpstreamSurfaceHookLifecycle(true);
+          }
+      }
+
+      if(null != context) {
+          context.setGLDrawable(drawable, true); // re-association
+      }
+      
+      if(contextCurrent) {
+          context.makeCurrent();
+      }
+      return drawable;
+  }
+   
+  /**
+   * Performs resize operation on the given drawable, assuming it is offscreen.
+   * <p>
+   * The {@link GLDrawableImpl}'s {@link NativeSurface} is being locked during operation.
+   * In case the holder is an auto drawable or similar, it's lock shall be claimed by the caller. 
+   * </p>
+   * <p>
+   * May recreate the drawable via {@link #recreateGLDrawable(GLDrawableImpl, GLContext)}
+   * in case of a a pbuffer- or pixmap-drawable.
+   * </p>
+   * <p>
+   * FBO drawables are resized w/o drawable destruction.
+   * </p>
+   * <p>
+   * Offscreen resize operation is validated w/ drawable size in the end. 
+   * An exception is thrown if not successful.
+   * </p>
+   * 
+   * @param drawable
+   * @param context
+   * @param newWidth the new width, it's minimum is capped to 1
+   * @param newHeight the new height, it's minimum is capped to 1
+   * @return the new drawable in case of an pbuffer/pixmap drawable, otherwise the passed drawable is being returned.
+   * @throws NativeWindowException is drawable is not offscreen or it's surface lock couldn't be claimed
+   * @throws GLException may be thrown a resize operation
+   */
+  public static final GLDrawableImpl resizeOffscreenDrawable(GLDrawableImpl drawable, GLContext context, int newWidth, int newHeight)
+          throws NativeWindowException, GLException 
+  {
+      if(drawable.getChosenGLCapabilities().isOnscreen()) {
+          throw new NativeWindowException("Drawable is not offscreen: "+drawable);
+      }
+      final NativeSurface ns = drawable.getNativeSurface();
+      final int lockRes = ns.lockSurface();
+      if (NativeSurface.LOCK_SURFACE_NOT_READY >= lockRes) {
+          throw new NativeWindowException("Could not lock surface of drawable: "+drawable);
+      }
+      try {
+          if(0>=newWidth)  { newWidth = 1; }
+          if(0>=newHeight) { newHeight = 1; }
+          // propagate new size 
+          if(ns instanceof ProxySurface) {
+              final ProxySurface ps = (ProxySurface) ns;
+              final UpstreamSurfaceHook ush = ps.getUpstreamSurfaceHook();
+              if(ush instanceof UpstreamSurfaceHook.MutableSize) {
+                  ((UpstreamSurfaceHook.MutableSize)ush).setSize(newWidth, newHeight);
+              } else if(DEBUG) { // we have to assume UpstreamSurfaceHook contains the new size already, hence size check @ bottom
+                  System.err.println("GLDrawableHelper.resizeOffscreenDrawable: Drawable's offscreen ProxySurface n.a. UpstreamSurfaceHook.MutableSize, but "+ush.getClass().getName()+": "+ush);
+              }
+          } else if(DEBUG) { // we have to assume surface contains the new size already, hence size check @ bottom
+              System.err.println("GLDrawableHelper.resizeOffscreenDrawable: Drawable's offscreen surface n.a. ProxySurface, but "+ns.getClass().getName()+": "+ns);
+          }
+          if(drawable instanceof GLFBODrawable) {
+              if( null != context && context.isCreated() ) {                      
+                  ((GLFBODrawable) drawable).resetSize(context.getGL());
+              }
+          } else {
+              drawable = GLDrawableHelper.recreateGLDrawable(drawable, context);
+          }
+      } finally {
+          ns.unlockSurface();
+      }
+      if(drawable.getWidth() != newWidth || drawable.getHeight() != newHeight) {
+          throw new InternalError("Incomplete resize operation: expected "+newWidth+"x"+newHeight+", has: "+drawable);
+      }
+      return drawable;
+  }
+    
   public final void addGLEventListener(GLEventListener listener) {
     addGLEventListener(-1, listener);
   }
@@ -196,15 +324,11 @@ public class GLDrawableHelper {
     }
   }
 
-  private final boolean init(GLEventListener l, GLAutoDrawable drawable, boolean sendReshape) {
-      if(listenersToBeInit.remove(l)) {
-          l.init(drawable);
-          if(sendReshape) {
-              reshape(l, drawable, 0, 0, drawable.getWidth(), drawable.getHeight(), true /* setViewport */, false /* checkInit */);
-          }
-          return true;
+  private final void init(GLEventListener l, GLAutoDrawable drawable, boolean sendReshape) {
+      l.init(drawable);
+      if(sendReshape) {
+          reshape(l, drawable, 0, 0, drawable.getWidth(), drawable.getHeight(), true /* setViewport */, false /* checkInit */);
       }
-      return false;
   }
 
   /** The default init action to be called once after ctx is being created @ 1st makeCurrent(). */
@@ -214,14 +338,11 @@ public class GLDrawableHelper {
         for (int i=0; i < _listeners.size(); i++) {
           final GLEventListener listener = _listeners.get(i) ;
 
-          // If make current ctx, invoked by invokGL(..), results in a new ctx, init gets called.
+          // If make ctx current, invoked by invokGL(..), results in a new ctx, init gets called.
           // This may happen not just for initial setup, but for ctx recreation due to resource change (drawable/window),
-          // hence the must always be initialized unconditional.
-          listenersToBeInit.add(listener);
-
-          if ( ! init( listener, drawable, true /* sendReshape */) ) {
-            throw new GLException("GLEventListener "+listener+" already initialized: "+drawable);
-          }
+          // hence it must be called unconditional, always.
+          listenersToBeInit.remove(listener); // remove if exist, avoiding dbl init
+          init( listener, drawable, true /* sendReshape */);
         }
     }
   }
@@ -239,7 +360,9 @@ public class GLDrawableHelper {
             final GLEventListener listener = _listeners.get(i) ;
             // GLEventListener may need to be init, 
             // in case this one is added after the realization of the GLAutoDrawable
-            init( listener, drawable, true /* sendReshape */) ; 
+            if( listenersToBeInit.remove(listener) ) {
+                init( listener, drawable, true /* sendReshape */) ;
+            }
             listener.display(drawable);
           }
       }
@@ -251,7 +374,9 @@ public class GLDrawableHelper {
         // GLEventListener may need to be init, 
         // in case this one is added after the realization of the GLAutoDrawable
         synchronized(listenersLock) {
-            init( listener, drawable, false /* sendReshape */) ;
+            if( listenersToBeInit.remove(listener) ) {
+                init( listener, drawable, false /* sendReshape */) ;
+            }
         }
     }
     if(setViewport) {
diff --git a/src/jogl/classes/jogamp/opengl/GLDrawableImpl.java b/src/jogl/classes/jogamp/opengl/GLDrawableImpl.java
index abf2bf557..311690f1d 100644
--- a/src/jogl/classes/jogamp/opengl/GLDrawableImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLDrawableImpl.java
@@ -43,6 +43,7 @@ package jogamp.opengl;
 import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.ProxySurface;
+import javax.media.opengl.GL;
 import javax.media.opengl.GLCapabilitiesImmutable;
 import javax.media.opengl.GLContext;
 import javax.media.opengl.GLDrawable;
@@ -76,31 +77,46 @@ public abstract class GLDrawableImpl implements GLDrawable {
     if( !realized ) {
         return; // destroyed already
     }
-    final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable)surface.getGraphicsConfiguration().getChosenCapabilities();
-    if ( caps.getDoubleBuffered() ) {
-        if(!surface.surfaceSwap()) {
-            int lockRes = lockSurface(); // it's recursive, so it's ok within [makeCurrent .. release]
-            if (NativeSurface.LOCK_SURFACE_NOT_READY == lockRes) {
-                return;
+    int lockRes = lockSurface(); // it's recursive, so it's ok within [makeCurrent .. release]
+    if (NativeSurface.LOCK_SURFACE_NOT_READY == lockRes) {
+        return;
+    }
+    try {
+        if (NativeSurface.LOCK_SURFACE_CHANGED == lockRes) {
+            updateHandle();
+        }
+        final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable)surface.getGraphicsConfiguration().getChosenCapabilities();
+        if ( caps.getDoubleBuffered() ) {
+            if(!surface.surfaceSwap()) {
+                swapBuffersImpl(true);
             }
-            try {
-                if (NativeSurface.LOCK_SURFACE_CHANGED == lockRes) {
-                    updateHandle();
-                }
-                swapBuffersImpl();
-            } finally {
-                unlockSurface();
+        } else {
+            final GLContext ctx = GLContext.getCurrent();
+            if(null!=ctx && ctx.getGLDrawable()==this) {
+                ctx.getGL().glFlush();
             }
+            swapBuffersImpl(false);
         }
-    } else {
-        GLContext ctx = GLContext.getCurrent();
-        if(null!=ctx && ctx.getGLDrawable()==this) {
-            ctx.getGL().glFinish();
-        }
-    }
+    } finally {
+        unlockSurface();
+    }        
     surface.surfaceUpdated(this, surface, System.currentTimeMillis());
   }
-  protected abstract void swapBuffersImpl();
+  
+  /**
+   * Platform and implementation depending surface swap.
+   * <p>The surface is locked.</p>
+   * <p>
+   * If <code>doubleBuffered</code> is <code>true</code>, 
+   * an actual platform dependent surface swap shall be executed.
+   * </p>
+   * <p>
+   * If <code>doubleBuffered</code> is <code>false</code>, 
+   * {@link GL#glFlush()} has been called already and 
+   * the implementation may execute implementation specific code.
+   * </p>
+   */
+  protected abstract void swapBuffersImpl(boolean doubleBuffered);
 
   public final static String toHexString(long hex) {
     return "0x" + Long.toHexString(hex);
@@ -181,6 +197,9 @@ public abstract class GLDrawableImpl implements GLDrawable {
         System.err.println(getThreadName() + ": setRealized: "+getClass().getName()+" "+this.realized+" == "+realizedArg);
     }
   }
+  /**
+   * Platform specific realization of drawable 
+   */
   protected abstract void setRealizedImpl();
 
   /** 
@@ -189,7 +208,7 @@ public abstract class GLDrawableImpl implements GLDrawable {
    * If <code>realized</code> is <code>true</code>, the context has just been created and made current.
    * </p>
    * <p>
-   * If <code>realized</code> is <code>false</code>, the context is still current and will be release and destroyed after this method returns.
+   * If <code>realized</code> is <code>false</code>, the context is still current and will be released and destroyed after this method returns.
    * </p>
    * <p>
    * @see #contextMadeCurrent(GLContext, boolean)
@@ -199,18 +218,27 @@ public abstract class GLDrawableImpl implements GLDrawable {
   /** 
    * Callback for special implementations, allowing GLContext to trigger GL related lifecycle: <code>makeCurrent</code>, <code>release</code>.
    * <p>
-   * Will not be called if {@link #contextRealized(GLContext, boolean)} has been triggered.
-   * </p>
-   * <p>
    * If <code>current</code> is <code>true</code>, the context has just been made current.
    * </p>
    * <p>
    * If <code>current</code> is <code>false</code>, the context is still current and will be release after this method returns.
    * </p>
+   * <p>
+   * Note: Will also be called after {@link #contextRealized(GLContext, boolean) contextRealized(ctx, true)}
+   * but not at context destruction, i.e. {@link #contextRealized(GLContext, boolean) contextRealized(ctx, false)}.
+   * </p>
    * @see #contextRealized(GLContext, boolean)
    */ 
   protected void contextMadeCurrent(GLContext glc, boolean current) { }
 
+  /**
+   * Callback for special implementations, allowing to associate bound context to this drawable (bound == true) 
+   * or to remove such association (bound == false).
+   * @param ctx the just bounded or unbounded context
+   * @param bound if <code>true</code> create an association, otherwise remove it
+   */
+  protected void associateContext(GLContext ctx, boolean bound) { }
+  
   /** Callback for special implementations, allowing GLContext to fetch a custom default render framebuffer. Defaults to zero.*/
   protected int getDefaultDrawFramebuffer() { return 0; }
   /** Callback for special implementations, allowing GLContext to fetch a custom default read framebuffer. Defaults to zero. */
@@ -245,8 +273,8 @@ public abstract class GLDrawableImpl implements GLDrawable {
   public String toString() {
     return getClass().getSimpleName()+"[Realized "+isRealized()+
                 ",\n\tFactory   "+getFactory()+
-                ",\n\thandle    "+toHexString(getHandle())+
-                ",\n\tWindow    "+getNativeSurface()+"]";
+                ",\n\tHandle    "+toHexString(getHandle())+
+                ",\n\tSurface   "+getNativeSurface()+"]";
   }
 
   protected static String getThreadName() {
diff --git a/src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java b/src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java
index 03bc26cbc..de45466f3 100644
--- a/src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java
@@ -1,142 +1,476 @@
 package jogamp.opengl;
 
 import javax.media.nativewindow.NativeSurface;
+import javax.media.nativewindow.NativeWindowException;
+import javax.media.nativewindow.ProxySurface;
+import javax.media.nativewindow.UpstreamSurfaceHook;
 import javax.media.opengl.GL;
-import javax.media.opengl.GL2GL3;
+import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLCapabilitiesImmutable;
 import javax.media.opengl.GLContext;
 import javax.media.opengl.GLException;
+import javax.media.opengl.GLFBODrawable;
 
 import com.jogamp.nativewindow.MutableGraphicsConfiguration;
 import com.jogamp.opengl.FBObject;
 import com.jogamp.opengl.FBObject.Attachment;
+import com.jogamp.opengl.FBObject.Colorbuffer;
 import com.jogamp.opengl.FBObject.TextureAttachment;
 
 /**
- * Offscreen GLDrawable implementation using framebuffer object (FBO)
- * as it's offscreen rendering mechanism.
+ * {@link FBObject} offscreen GLDrawable implementation, i.e. {@link GLFBODrawable}.
+ * <p>
+ * It utilizes the context lifecycle hook {@link #contextRealized(GLContext, boolean)}
+ * to initialize the {@link FBObject} instance.
+ * </p>
+ * <p>
+ * It utilizes the context current hook {@link #contextMadeCurrent(GLContext, boolean) contextMadeCurrent(context, true)} 
+ * to {@link FBObject#bind(GL) bind} the FBO.
+ * </p>
+ * See {@link GLFBODrawable} for double buffering details.
  * 
  * @see GLDrawableImpl#contextRealized(GLContext, boolean)
  * @see GLDrawableImpl#contextMadeCurrent(GLContext, boolean)
  * @see GLDrawableImpl#getDefaultDrawFramebuffer()
  * @see GLDrawableImpl#getDefaultReadFramebuffer()
  */
-public class GLFBODrawableImpl extends GLDrawableImpl {
-    final GLDrawableImpl parent;
-    final FBObject fbo;
-    int texUnit;
-    int samplesTexUnit = 0;
-    int width=0, height=0, samples=0;
-    
-    protected GLFBODrawableImpl(GLDrawableFactoryImpl factory, GLDrawableImpl parent, 
-                                NativeSurface surface, int initialWidth, int initialHeight, int textureUnit) {
+public class GLFBODrawableImpl extends GLDrawableImpl implements GLFBODrawable {
+    protected static final boolean DEBUG = GLDrawableImpl.DEBUG || Debug.debug("FBObject");
+    
+    private final GLDrawableImpl parent;
+    
+    private boolean initialized;
+    private int texUnit;
+    private int samples;
+    
+    private FBObject[] fbos;
+    private int fboIBack;  // points to GL_BACK buffer
+    private int fboIFront; // points to GL_FRONT buffer
+    private FBObject pendingFBOReset = null;
+    private boolean fboBound;
+    private static final int bufferCount = 2; // number of FBOs for double buffering. TODO: Possible to configure!
+    
+    // private DoubleBufferMode doubleBufferMode; // TODO: Add or remove TEXTURE (only) DoubleBufferMode support
+    
+    private SwapBufferContext swapBufferContext;
+    
+    public static interface SwapBufferContext {
+        public void swapBuffers(boolean doubleBuffered);
+    }
+    
+    protected GLFBODrawableImpl(GLDrawableFactoryImpl factory, GLDrawableImpl parent, NativeSurface surface, 
+                                GLCapabilitiesImmutable fboCaps, int textureUnit) {
         super(factory, surface, false);
+        this.initialized = false;
+
+        // Replace the chosen caps of dummy-surface w/ it's clone and copied values of orig FBO caps request.
+        // The dummy-surface has already been configured, hence value replace is OK
+        // and due to cloning, the native GLCapability portion is being preserved. 
+        final MutableGraphicsConfiguration msConfig = (MutableGraphicsConfiguration) surface.getGraphicsConfiguration();
+        final GLCapabilities fboCapsNative = (GLCapabilities) msConfig.getChosenCapabilities().cloneMutable();
+        fboCapsNative.copyFrom(fboCaps);
+        msConfig.setChosenCapabilities(fboCapsNative);
+            
         this.parent = parent;
         this.texUnit = textureUnit;
-        final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) surface.getGraphicsConfiguration().getChosenCapabilities();
-        this.width = initialWidth;
-        this.height = initialHeight;
-        this.samples = caps.getNumSamples();
-        this.fbo = new FBObject();
+        this.samples = fboCaps.getNumSamples();
+        
+        // default .. // TODO: Add or remove TEXTURE (only) DoubleBufferMode support
+        // this.doubleBufferMode = ( samples > 0 || fboCaps.getDoubleBuffered() ) ? DoubleBufferMode.FBO : DoubleBufferMode.NONE ;
+        
+        this.swapBufferContext = null;
     }
     
-    @Override
-    protected void contextRealized(GLContext glc, boolean realized) {
-        final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) surface.getGraphicsConfiguration().getChosenCapabilities();
-        final GL gl = glc.getGL();
-        if(realized) {                   
-            fbo.reset(gl, width, height, samples);
-            samples = fbo.getNumSamples(); // update, maybe capped
+    private final void initialize(boolean realize, GL gl) {        
+        if(realize) {
+            final int maxSamples = gl.getMaxRenderbufferSamples();
+            samples = samples <= maxSamples ? samples : maxSamples;
+            
+            final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) surface.getGraphicsConfiguration().getChosenCapabilities();
+            final int fbosN;
             if(samples > 0) {
-                fbo.attachColorbuffer(gl, 0, caps.getAlphaBits()>0);
+                fbosN = 1;
+            } else if( caps.getDoubleBuffered() ) {
+                fbosN = bufferCount;
             } else {
-                fbo.attachTexture2D(gl, 0, caps.getAlphaBits()>0);
+                fbosN = 1;
             }
-            if( caps.getStencilBits() > 0 ) {
-                fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH_STENCIL, 24);
-            } else {
-                fbo.attachRenderbuffer(gl, Attachment.Type.DEPTH, 24);
+
+            fbos = new FBObject[fbosN];
+            fboIBack = 0;                // head
+            fboIFront = fbos.length - 1; // tail
+            
+            for(int i=0; i<fbosN; i++) {
+                fbos[i] = new FBObject();
+                fbos[i].reset(gl, getWidth(), getHeight(), samples);
+                if(fbos[i].getNumSamples() != samples) {
+                    throw new InternalError("Sample number mismatch: "+samples+", fbos["+i+"] "+fbos[i]);
+                }
+                if(samples > 0) {
+                    fbos[i].attachColorbuffer(gl, 0, caps.getAlphaBits()>0);
+                } else {
+                    fbos[i].attachTexture2D(gl, 0, caps.getAlphaBits()>0);
+                }
+                if( caps.getStencilBits() > 0 ) {
+                    fbos[i].attachRenderbuffer(gl, Attachment.Type.DEPTH_STENCIL, 24);
+                } else {
+                    fbos[i].attachRenderbuffer(gl, Attachment.Type.DEPTH, 24);
+                }
             }
-        } else if(null != fbo) {
-            fbo.destroy(gl);
-        }
-    }
-    
-    @Override
-    protected void contextMadeCurrent(GLContext glc, boolean current) {
-        final GL gl = glc.getGL();
-        if(current) {
-            fbo.bind(gl);
+            fbos[fboIFront].syncFramebuffer(gl);
+            fboBound = false;
+            final GLCapabilities fboCapsNative = (GLCapabilities) surface.getGraphicsConfiguration().getChosenCapabilities();
+            fbos[0].formatToGLCapabilities(fboCapsNative);
+            fboCapsNative.setDoubleBuffered( fboCapsNative.getDoubleBuffered() || samples > 0 );
+            
+            initialized = true;            
         } else {
-            fbo.unbind(gl);
-            final TextureAttachment attachment = samples > 0 ? fbo.getSamplingSink() : (TextureAttachment) fbo.getColorbuffer(0) ;
-            if(null == attachment) {
-                throw new GLException("Null texture colorbuffer, samples "+samples+", "+fbo.toString());
-            }
-            gl.glActiveTexture(GL.GL_TEXTURE0 + texUnit);
-            fbo.use(gl, attachment );
-            if( samples > 0) {
-                gl.glBindFramebuffer(GL2GL3.GL_READ_FRAMEBUFFER, fbo.getReadFramebuffer());
+            initialized = false;
+            
+            for(int i=0; i<fbos.length; i++) {
+                fbos[i].destroy(gl);
             }
+            fbos=null;
+            fboBound = false;   
+            pendingFBOReset = null;
+        }
+        if(DEBUG) {
+            System.err.println("GLFBODrawableImpl.initialize("+realize+"): "+this);
+            Thread.dumpStack();
         }
     }
     
-    @Override
-    protected int getDefaultDrawFramebuffer() { return fbo.getWriteFramebuffer(); }
-    
-    @Override
-    protected int getDefaultReadFramebuffer() { return fbo.getReadFramebuffer(); }
-    
-    public FBObject getFBObject() { return fbo; }
-    
-    public void setSize(GL gl, int newWidth, int newHeight) throws GLException {
-        width = newWidth;
-        height = newHeight;        
-        fbo.reset(gl, width, height, samples);
-        samples = fbo.getNumSamples(); // update, maybe capped
+    public final void setSwapBufferContext(SwapBufferContext sbc) {
+        swapBufferContext = sbc;
+    }
+
+    private static final void reset(GL gl, FBObject fbo, int fboIdx, int width, int height, int samples) {
+        fbo.reset(gl, width, height, samples); // implicit glClear(..)
+        if(fbo.getNumSamples() != samples) {
+            throw new InternalError("Sample number mismatch: "+samples+", fbos["+fboIdx+"] "+fbo);
+        }        
     }
     
-    public void setSamples(GL gl, int newSamples) throws GLException {
-        samples = newSamples;
-        fbo.reset(gl, width, height, samples);
-        samples = fbo.getNumSamples(); // update, maybe capped
+    private final void reset(GL gl, int newSamples) throws GLException {
+        if(!initialized) {
+            // NOP if not yet initializes
+            return;
+        }
+                
+        final GLContext curContext = GLContext.getCurrent();
+        final GLContext ourContext = gl.getContext();
+        final boolean ctxSwitch = null != curContext && curContext != ourContext; 
+        if(DEBUG) {
+            System.err.println("GLFBODrawableImpl.reset(newSamples "+newSamples+"): BEGIN - ctxSwitch "+ctxSwitch+", "+this);
+            Thread.dumpStack();
+        }
+        Throwable tFBO = null;
+        Throwable tGL = null;
+        ourContext.makeCurrent();
+        fboBound = false; // clear bound-flag immediatly, caused by contextMadeCurrent(..) - otherwise we would swap @ release
+        try {                        
+            final int maxSamples = gl.getMaxRenderbufferSamples();        
+            newSamples = newSamples <= maxSamples ? newSamples : maxSamples;
+            
+            if(0==samples && 0<newSamples || 0<samples && 0==newSamples) {
+                // MSAA on/off switch
+                if(DEBUG) {
+                    System.err.println("GLFBODrawableImpl.reset(): samples [on/off] reconfig: "+samples+" -> "+newSamples);
+                }
+                initialize(false, gl);
+                samples = newSamples;
+                initialize(true, gl);
+            } else {            
+                if(DEBUG) {
+                    System.err.println("GLFBODrawableImpl.reset(): simple reconfig: "+samples+" -> "+newSamples);
+                }
+                final int nWidth = getWidth();
+                final int nHeight = getHeight();
+                samples = newSamples;
+                pendingFBOReset = ( 1 < fbos.length ) ? fbos[fboIFront] : null; // pending-front reset only w/ double buffering (or zero samples)
+                for(int i=0; i<fbos.length; i++) {
+                    if(1 == fbos.length || fboIFront != i) {
+                        reset(gl, fbos[i], i, nWidth, nHeight, samples);
+                    }
+                }
+                final GLCapabilities fboCapsNative = (GLCapabilities) surface.getGraphicsConfiguration().getChosenCapabilities();
+                fbos[0].formatToGLCapabilities(fboCapsNative);
+            }
+        } catch (Throwable t) {
+            tFBO = t;
+        } finally {
+            try {
+                ourContext.release();
+                if(ctxSwitch) {
+                    curContext.makeCurrent();
+                }
+            } catch (Throwable t) {
+                tGL = t;
+            }
+        }
+        if(null != tFBO) {
+            throw new GLException("GLFBODrawableImpl.reset(..) FBObject.reset(..) exception", tFBO);
+        }
+        if(null != tGL) {
+            throw new GLException("GLFBODrawableImpl.reset(..) GLContext.release() exception", tGL);
+        }
+        if(DEBUG) {
+            System.err.println("GLFBODrawableImpl.reset(newSamples "+newSamples+"): END "+this);
+        }
     }
     
+    //
+    // GLDrawable
+    //
     
     @Override
-    public GLContext createContext(GLContext shareWith) {
+    public final GLContext createContext(GLContext shareWith) {
         final GLContext ctx = parent.createContext(shareWith);
         ctx.setGLDrawable(this, false);
         return ctx;
     }
 
+    //
+    // GLDrawableImpl
+    //
+    
     @Override
-    public GLDynamicLookupHelper getGLDynamicLookupHelper() {
+    public final GLDynamicLookupHelper getGLDynamicLookupHelper() {
         return parent.getGLDynamicLookupHelper();
     }
 
     @Override
-    protected void swapBuffersImpl() {
-    }
+    protected final int getDefaultDrawFramebuffer() { return initialized ? fbos[fboIBack].getWriteFramebuffer() : 0; }
+    
+    @Override
+    protected final int getDefaultReadFramebuffer() { return initialized ? fbos[fboIFront].getReadFramebuffer() : 0; }
 
     @Override
-    protected void setRealizedImpl() {
+    protected final void setRealizedImpl() {
         parent.setRealized(realized);
-        if(realized) {    
-            final MutableGraphicsConfiguration msConfig = (MutableGraphicsConfiguration) surface.getGraphicsConfiguration();
-            final GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable) msConfig.getChosenCapabilities();
-            final GLCapabilitiesImmutable chosenFBOCaps = GLGraphicsConfigurationUtil.fixOffscreenGLCapabilities(chosenCaps, true /*FBO*/, false /*PBO*/);    
-            msConfig.setChosenCapabilities(chosenFBOCaps);
+    }
+    
+    @Override
+    protected final void contextRealized(GLContext glc, boolean realized) {
+        initialize(realized, glc.getGL());
+    }
+    
+    @Override
+    protected final void contextMadeCurrent(GLContext glc, boolean current) {
+        final GL gl = glc.getGL();
+        if(current) {
+            fbos[fboIBack].bind(gl);
+            fboBound = true;
+        } else {
+            if(fboBound) {
+                swapFBOImpl(glc);
+                fboBound=false;
+                if(DEBUG) {
+                    System.err.println("Post FBO swap(@release): done");
+                }
+            }
         }
     }
-
+        
     @Override
-    public int getWidth() {
-        return width;
+    protected void swapBuffersImpl(boolean doubleBuffered) {
+        final GLContext ctx = GLContext.getCurrent();
+        if(null!=ctx && ctx.getGLDrawable()==this) {
+            if(fboBound) {
+                swapFBOImpl(ctx);
+                fboBound=false;
+                if(DEBUG) {
+                    System.err.println("Post FBO swap(@swap): done");
+                }
+            }
+        }
+        if(null != swapBufferContext) {
+            swapBufferContext.swapBuffers(doubleBuffered);
+        }
+    }
+    
+    private final void swapFBOImpl(GLContext glc) {
+        final GL gl = glc.getGL();
+        fbos[fboIBack].markUnbound(); // fast path, use(gl,..) is called below
+
+        // Safely reset the previous front FBO
+        if(null != pendingFBOReset) {
+            reset(gl, pendingFBOReset, fboIFront, getWidth(), getHeight(), samples);
+            pendingFBOReset = null;
+        }
+        
+        if(DEBUG) {
+            int _fboIFront = ( fboIFront + 1 ) % fbos.length;
+            if(_fboIFront != fboIBack) { throw new InternalError("XXX: "+_fboIFront+"!="+fboIBack); }
+        }
+        fboIFront = fboIBack;
+        fboIBack  = ( fboIBack  + 1 ) % fbos.length;
+        
+        final Colorbuffer colorbuffer = samples > 0 ? fbos[fboIFront].getSamplingSink() : fbos[fboIFront].getColorbuffer(0);
+        final TextureAttachment texAttachment;
+        if(colorbuffer instanceof TextureAttachment) {
+            texAttachment = (TextureAttachment) colorbuffer;
+        } else {
+            if(null == colorbuffer) {
+                throw new GLException("Front colorbuffer is null: samples "+samples+", "+this);
+            } else {
+                throw new GLException("Front colorbuffer is not a texture: "+colorbuffer.getClass().getName()+": samples "+samples+", "+colorbuffer+", "+this);
+            }
+        }
+        gl.glActiveTexture(GL.GL_TEXTURE0 + texUnit);
+        fbos[fboIFront].use(gl, texAttachment);
+        
+        /* Included in above use command:  
+                gl.glBindFramebuffer(GL2GL3.GL_DRAW_FRAMEBUFFER, fbos[fboIBack].getDrawFramebuffer());
+                gl.glBindFramebuffer(GL2GL3.GL_READ_FRAMEBUFFER, fbos[fboIFront].getReadFramebuffer());
+        } */
+        
+        if(DEBUG) {
+            System.err.println("Post FBO swap(X): fboI back "+fboIBack+", front "+fboIFront+", num "+fbos.length);
+        }
     }
 
+    //
+    // GLFBODrawable
+    // 
+    
+    @Override
+    public final boolean isInitialized() {
+        return initialized;
+    }
+    
     @Override
-    public int getHeight() {
-        return height;
+    public final void resetSize(GL gl) throws GLException {
+        reset(gl, samples);
     }    
+    
+    @Override
+    public final int getTextureUnit() { return texUnit; }
+    
+    @Override
+    public final void setTextureUnit(int u) { texUnit = u; }
+    
+    @Override
+    public final int getNumSamples() { return samples; }
+    
+    @Override
+    public void setNumSamples(GL gl, int newSamples) throws GLException {
+        if(samples != newSamples) {
+            reset(gl, newSamples);
+        }
+    }
+    
+    /** // TODO: Add or remove TEXTURE (only) DoubleBufferMode support
+    @Override
+    public final DoubleBufferMode getDoubleBufferMode() {
+        return doubleBufferMode;
+    }
+    
+    @Override
+    public final void setDoubleBufferMode(DoubleBufferMode mode) throws GLException {
+        if(initialized) {
+            throw new GLException("Not allowed past initialization: "+this);
+        }        
+        final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) surface.getGraphicsConfiguration().getChosenCapabilities();
+        if(0 == samples && caps.getDoubleBuffered() && DoubleBufferMode.NONE != mode) {
+            doubleBufferMode = mode;
+        }
+    } */
+    
+    @Override
+    public FBObject getFBObject(int bufferName) throws IllegalArgumentException {
+        if(!initialized) {
+            return null;
+        }
+        final FBObject res;
+        switch(bufferName) {
+            case GL.GL_FRONT:
+                if( samples > 0 ) {
+                    res = fbos[0].getSamplingSinkFBO();
+                } else {
+                    res = fbos[fboIFront];
+                }
+                break;
+            case GL.GL_BACK:
+                res = fbos[fboIBack];
+                break;
+            default: 
+                throw new IllegalArgumentException(illegalBufferName+toHexString(bufferName));
+        }        
+        return res;  
+    }
+    
+    @Override
+    public final TextureAttachment getTextureBuffer(int bufferName) throws IllegalArgumentException {
+        if(!initialized) {
+            return null;
+        }
+        final TextureAttachment res;
+        switch(bufferName) {
+            case GL.GL_FRONT:
+                if( samples > 0 ) {
+                    res = fbos[0].getSamplingSink();
+                } else {
+                    res = (TextureAttachment) fbos[fboIFront].getColorbuffer(0);
+                }
+                break;
+            case GL.GL_BACK:
+                if( samples > 0 ) {
+                    throw new IllegalArgumentException("Cannot access GL_BACK buffer of MSAA FBO: "+this);
+                } else {
+                    res = (TextureAttachment) fbos[fboIBack].getColorbuffer(0);
+                }
+                break;
+            default: 
+                throw new IllegalArgumentException(illegalBufferName+toHexString(bufferName));
+        }        
+        return res;  
+    }
+    private static final String illegalBufferName = "Only GL_FRONT and GL_BACK buffer are allowed, passed ";
+    
+    @Override
+    public String toString() {
+        return getClass().getSimpleName()+"[Initialized "+initialized+", realized "+isRealized()+", texUnit "+texUnit+", samples "+samples+
+                ",\n\tFactory   "+getFactory()+
+                ",\n\tHandle    "+toHexString(getHandle())+
+                ",\n\tCaps      "+surface.getGraphicsConfiguration().getChosenCapabilities()+
+                ",\n\tfboI back "+fboIBack+", front "+fboIFront+", num "+(initialized ? fbos.length : 0)+
+                ",\n\tFBO front read "+getDefaultReadFramebuffer()+", "+getFBObject(GL.GL_FRONT)+
+                ",\n\tFBO back  write "+getDefaultDrawFramebuffer()+", "+getFBObject(GL.GL_BACK)+
+                ",\n\tSurface   "+getNativeSurface()+
+                "]";
+    }
+    
+    public static class ResizeableImpl extends GLFBODrawableImpl implements GLFBODrawable.Resizeable {
+        protected ResizeableImpl(GLDrawableFactoryImpl factory, GLDrawableImpl parent, ProxySurface surface, 
+                                 GLCapabilitiesImmutable fboCaps, int textureUnit) {
+            super(factory, parent, surface, fboCaps, textureUnit);
+        }
+        
+        @Override
+        public final void setSize(GLContext context, int newWidth, int newHeight) throws NativeWindowException, GLException {
+            if(DEBUG) {
+                System.err.println("GLFBODrawableImpl.ResizeableImpl setSize: ("+Thread.currentThread().getName()+"): "+newWidth+"x"+newHeight+" - surfaceHandle 0x"+Long.toHexString(getNativeSurface().getSurfaceHandle()));
+            }
+            int lockRes = lockSurface();
+            if (NativeSurface.LOCK_SURFACE_NOT_READY >= lockRes) {
+                throw new NativeWindowException("Could not lock surface: "+this);
+            }
+            try {
+                // propagate new size 
+                final ProxySurface ps = (ProxySurface) getNativeSurface();
+                final UpstreamSurfaceHook ush = ps.getUpstreamSurfaceHook();
+                if(ush instanceof UpstreamSurfaceHook.MutableSize) {
+                    ((UpstreamSurfaceHook.MutableSize)ush).setSize(newWidth, newHeight);
+                } else {
+                    throw new InternalError("GLFBODrawableImpl.ResizableImpl's ProxySurface doesn't hold a UpstreamSurfaceHookMutableSize but "+ush.getClass().getName()+", "+ps+", ush");
+                }
+                if( null != context && context.isCreated() ) {
+                    resetSize(context.getGL());
+                }
+            } finally {
+                unlockSurface();
+            }
+        }
+    }
 }
diff --git a/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java b/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
index 768fc6892..79f96b64a 100644
--- a/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
+++ b/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
@@ -28,8 +28,12 @@
 
 package jogamp.opengl;
 
+import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLCapabilitiesImmutable;
+import javax.media.opengl.GLContext;
+
+import com.jogamp.common.os.Platform;
 
 public class GLGraphicsConfigurationUtil {
     public static final String NV_coverage_sample = "NV_coverage_sample";
@@ -119,26 +123,34 @@ public class GLGraphicsConfigurationUtil {
         return getExclusiveWinAttributeBits(caps.isOnscreen(), caps.isFBO(), caps.isPBuffer(), caps.isBitmap());
     }
 
-    public static final GLCapabilities setWinAttributeBits(GLCapabilities caps, int winattrbits) {
+    public static final GLCapabilities fixWinAttribBitsAndHwAccel(AbstractGraphicsDevice device, int winattrbits, GLCapabilities caps) {
         caps.setBitmap  ( 0 != ( BITMAP_BIT  & winattrbits ) );
         caps.setPBuffer ( 0 != ( PBUFFER_BIT & winattrbits ) );
         caps.setFBO     ( 0 != ( FBO_BIT     & winattrbits ) );
         // we reflect availability semantics, hence setting onscreen at last (maybe overwritten above)!
-        caps.setOnscreen( 0 != ( WINDOW_BIT  & winattrbits ) ); 
-        return caps;
-    }
+        caps.setOnscreen( 0 != ( WINDOW_BIT  & winattrbits ) );
 
+        final int accel = GLContext.isHardwareRasterizer( device, caps.getGLProfile() );
+        if(0 == accel && caps.getHardwareAccelerated() ) {
+            caps.setHardwareAccelerated(false);
+        }
+
+        return caps;        
+    }
+    
     public static GLCapabilitiesImmutable fixGLCapabilities(GLCapabilitiesImmutable capsRequested, boolean fboAvailable, boolean pbufferAvailable)
     {
         if( !capsRequested.isOnscreen() ) {
             return fixOffscreenGLCapabilities(capsRequested, fboAvailable, pbufferAvailable);
-        }
+        } /* we maintain the offscreen mode flags in onscreen mode - else { 
+            return fixOnscreenGLCapabilities(capsRequested);
+        } */
         return capsRequested;
     }
 
     public static GLCapabilitiesImmutable fixOnscreenGLCapabilities(GLCapabilitiesImmutable capsRequested)
     {
-        if( !capsRequested.isOnscreen() ) {
+        if( !capsRequested.isOnscreen() || capsRequested.isFBO() || capsRequested.isPBuffer() || capsRequested.isBitmap() ) { 
             // fix caps ..
             final GLCapabilities caps2 = (GLCapabilities) capsRequested.cloneMutable();
             caps2.setBitmap  (false);
@@ -157,9 +169,11 @@ public class GLGraphicsConfigurationUtil {
 
     public static GLCapabilitiesImmutable fixOffscreenGLCapabilities(GLCapabilitiesImmutable capsRequested, boolean fboAvailable, boolean pbufferAvailable) {
         final boolean auto = !capsRequested.isFBO() && !capsRequested.isPBuffer() && !capsRequested.isBitmap() ;
+
+        final boolean requestedPBuffer = capsRequested.isPBuffer() || Platform.getOSType() == Platform.OSType.MACOS ; // no native bitmap for OSX
         
         final boolean useFBO     =                fboAvailable     && ( auto || capsRequested.isFBO()     ) ;
-        final boolean usePbuffer = !useFBO     && pbufferAvailable && ( auto || capsRequested.isPBuffer() ) ;
+        final boolean usePbuffer = !useFBO     && pbufferAvailable && ( auto || requestedPBuffer          ) ;
         final boolean useBitmap  = !useFBO     && !usePbuffer      && ( auto || capsRequested.isBitmap()  ) ;
         
         if( capsRequested.isOnscreen() ||
diff --git a/src/jogl/classes/jogamp/opengl/GLOffscreenAutoDrawableImpl.java b/src/jogl/classes/jogamp/opengl/GLOffscreenAutoDrawableImpl.java
new file mode 100644
index 000000000..7701f209f
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/GLOffscreenAutoDrawableImpl.java
@@ -0,0 +1,123 @@
+/**
+ * Copyright 2012 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 jogamp.opengl;
+
+import javax.media.nativewindow.NativeWindowException;
+import javax.media.opengl.GL;
+import javax.media.opengl.GLContext;
+import javax.media.opengl.GLDrawable;
+import javax.media.opengl.GLException;
+import javax.media.opengl.GLOffscreenAutoDrawable;
+
+import com.jogamp.common.util.locks.RecursiveLock;
+import com.jogamp.opengl.FBObject;
+import com.jogamp.opengl.GLAutoDrawableDelegate;
+
+import jogamp.opengl.GLFBODrawableImpl;
+
+public class GLOffscreenAutoDrawableImpl extends GLAutoDrawableDelegate implements GLOffscreenAutoDrawable {
+  
+    /**
+     * @param drawable a valid and already realized {@link GLDrawable}
+     * @param context a valid {@link GLContext}, may not be made current (created) yet.
+     * @param upstreamWidget optional UI element holding this instance, see {@link #getUpstreamWidget()}.
+     * @param lock optional upstream lock, may be null
+     */
+    public GLOffscreenAutoDrawableImpl(GLDrawable drawable, GLContext context, Object upstreamWidget, RecursiveLock lock) {
+        super(drawable, context, upstreamWidget, true, lock);
+    }
+    
+    @Override
+    public void setSize(int newWidth, int newHeight) throws NativeWindowException, GLException {
+        this.defaultWindowResizedOp(newWidth, newHeight);
+    }
+    
+    public static class FBOImpl extends GLOffscreenAutoDrawableImpl implements GLOffscreenAutoDrawable.FBO {      
+        /**
+         * @param drawable a valid and already realized {@link GLDrawable}
+         * @param context a valid {@link GLContext}, may not be made current (created) yet.
+         * @param upstreamWidget optional UI element holding this instance, see {@link #getUpstreamWidget()}.
+         * @param lock optional upstream lock, may be null
+         */
+        public FBOImpl(GLFBODrawableImpl drawable, GLContext context, Object upstreamWidget, RecursiveLock lock) {
+            super(drawable, context, upstreamWidget, lock);
+        }
+        
+        @Override
+        public boolean isInitialized() {
+            return ((GLFBODrawableImpl)drawable).isInitialized();
+        }
+
+        @Override
+        public final int getTextureUnit() {
+            return ((GLFBODrawableImpl)drawable).getTextureUnit();
+        }
+        
+        @Override
+        public final void setTextureUnit(int unit) {
+            ((GLFBODrawableImpl)drawable).setTextureUnit(unit);
+        }
+
+        @Override
+        public final int getNumSamples() {
+            return ((GLFBODrawableImpl)drawable).getNumSamples();
+        }
+        
+        @Override
+        public final void setNumSamples(GL gl, int newSamples) throws GLException {
+            ((GLFBODrawableImpl)drawable).setNumSamples(gl, newSamples);
+            windowRepaintOp();
+        }
+        
+        /** // TODO: Add or remove TEXTURE (only) DoubleBufferMode support
+        @Override
+        public DoubleBufferMode getDoubleBufferMode() {
+            return ((GLFBODrawableImpl)drawable).getDoubleBufferMode();
+        }
+
+        @Override
+        public void setDoubleBufferMode(DoubleBufferMode mode) throws GLException {
+            ((GLFBODrawableImpl)drawable).setDoubleBufferMode(mode);            
+        } */
+        
+        @Override
+        public final FBObject getFBObject(int bufferName) { 
+            return ((GLFBODrawableImpl)drawable).getFBObject(bufferName);
+        }
+        
+        public final FBObject.TextureAttachment getTextureBuffer(int bufferName) {
+            return ((GLFBODrawableImpl)drawable).getTextureBuffer(bufferName);
+        }
+
+        @Override
+        public void resetSize(GL gl) throws GLException {
+            ((GLFBODrawableImpl)drawable).resetSize(gl);
+        }        
+    }
+}
diff --git a/src/jogl/classes/jogamp/opengl/GLPbufferImpl.java b/src/jogl/classes/jogamp/opengl/GLPbufferImpl.java
index 32f4cb696..b438131bc 100644
--- a/src/jogl/classes/jogamp/opengl/GLPbufferImpl.java
+++ b/src/jogl/classes/jogamp/opengl/GLPbufferImpl.java
@@ -40,9 +40,6 @@
 
 package jogamp.opengl;
 
-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;
@@ -50,36 +47,18 @@ import javax.media.opengl.GLPbuffer;
 import com.jogamp.common.util.locks.LockFactory;
 import com.jogamp.common.util.locks.RecursiveLock;
 
-/** Platform-independent class exposing pbuffer functionality to
-    applications. This class is not exposed in the public API as it
-    would probably add no value; however it implements the GLDrawable
-    interface so can be interacted with via its display() method. */
-
+@SuppressWarnings("deprecation")
 public class GLPbufferImpl extends GLAutoDrawableBase implements GLPbuffer {
   private int floatMode;
 
-  public GLPbufferImpl(GLDrawableImpl pbufferDrawable, GLContext sharedContext, boolean ownDevice) {
-    super(pbufferDrawable, null, ownDevice); // drawable := pbufferDrawable 
-    
-    GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable)
-         drawable.getNativeSurface().getGraphicsConfiguration().getChosenCapabilities();
-    if(caps.isOnscreen()) {
-        if(caps.isPBuffer()) {
-            throw new IllegalArgumentException("Error: Given drawable is Onscreen and Pbuffer: "+pbufferDrawable);
-        }
-        throw new IllegalArgumentException("Error: Given drawable is Onscreen: "+pbufferDrawable);
-    } else {
-        if(!caps.isPBuffer()) {
-            throw new IllegalArgumentException("Error: Given drawable is not Pbuffer: "+pbufferDrawable);
-        }
-    }
-    context = (GLContextImpl) drawable.createContext(sharedContext);
+  public GLPbufferImpl(GLDrawableImpl pbufferDrawable, GLContextImpl pbufferContext) {
+    super(pbufferDrawable, pbufferContext, true); // drawable := pbufferDrawable, context := pbufferContext  
   }
 
   //
   // pbuffer specifics
-  // 
-  
+  //
+
   @Override
   public void bindTexture() {
     // Doesn't make much sense to try to do this on the event dispatch
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLContext.java b/src/jogl/classes/jogamp/opengl/egl/EGLContext.java
index 03d0d650f..06953a8e1 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLContext.java
@@ -282,12 +282,6 @@ public abstract class EGLContext extends GLContextImpl {
         return EGL.eglSwapInterval(drawable.getNativeSurface().getDisplayHandle(), interval);
     }
 
-    @Override
-    public abstract void bindPbufferToTexture();
-
-    @Override
-    public abstract void releasePbufferFromTexture();
-
     //
     // Accessible ..
     //
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLDrawable.java b/src/jogl/classes/jogamp/opengl/egl/EGLDrawable.java
index 0dba4bb09..167eebf3a 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLDrawable.java
@@ -36,7 +36,8 @@
 
 package jogamp.opengl.egl;
 
-import javax.media.nativewindow.MutableSurface;
+import java.nio.IntBuffer;
+
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.NativeWindow;
 import javax.media.nativewindow.ProxySurface;
@@ -46,10 +47,10 @@ import javax.media.opengl.GLException;
 import jogamp.opengl.GLDrawableImpl;
 import jogamp.opengl.GLDynamicLookupHelper;
 
+import com.jogamp.common.nio.Buffers;
 import com.jogamp.nativewindow.egl.EGLGraphicsDevice;
 
 public abstract class EGLDrawable extends GLDrawableImpl {
-    private boolean ownEGLSurface = false; // for destruction
 
     protected EGLDrawable(EGLDrawableFactory factory, NativeSurface component) throws GLException {
         super(factory, component, false);
@@ -58,21 +59,14 @@ public abstract class EGLDrawable extends GLDrawableImpl {
     @Override
     public abstract GLContext createContext(GLContext shareWith);
 
-    protected abstract long createSurface(EGLGraphicsConfiguration config, long nativeSurfaceHandle);
+    protected abstract long createSurface(EGLGraphicsConfiguration config, int width, int height, long nativeSurfaceHandle);    
 
-    private final void recreateSurface() {
-        final EGLGraphicsConfiguration eglConfig = (EGLGraphicsConfiguration) surface.getGraphicsConfiguration();
-        final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) eglConfig.getScreen().getDevice();
-        if(DEBUG) {
-            System.err.println(getThreadName() + ": createSurface using "+eglConfig);
-        }        
-        if( EGL.EGL_NO_SURFACE != surface.getSurfaceHandle() ) {
-            EGL.eglDestroySurface(eglDevice.getHandle(), surface.getSurfaceHandle());
-        }
+    private final long createEGLSurface() {
+        final EGLWrappedSurface eglws = (EGLWrappedSurface) surface;
+        final EGLGraphicsConfiguration eglConfig = (EGLGraphicsConfiguration) eglws.getGraphicsConfiguration();        
+        final NativeSurface upstreamSurface = eglws.getUpstreamSurface();
         
-        final EGLUpstreamSurfaceHook upstreamHook = (EGLUpstreamSurfaceHook) ((ProxySurface)surface).getUpstreamSurfaceHook();
-        final NativeSurface upstreamSurface = upstreamHook.getUpstreamSurface();
-        long eglSurface = createSurface(eglConfig, upstreamSurface.getSurfaceHandle());
+        long eglSurface = createSurface(eglConfig, eglws.getWidth(), eglws.getHeight(), upstreamSurface.getSurfaceHandle());
         
         int eglError0;
         if (EGL.EGL_NO_SURFACE == eglSurface) {
@@ -86,7 +80,7 @@ public abstract class EGLDrawable extends GLDrawableImpl {
                         if(DEBUG) {
                             System.err.println(getThreadName() + ": Info: Creation of window surface w/ surface handle failed: "+eglConfig+", error "+toHexString(eglError0)+", retry w/ windowHandle");
                         }
-                        eglSurface = createSurface(eglConfig, nw.getWindowHandle());
+                        eglSurface = createSurface(eglConfig, eglws.getWidth(), eglws.getHeight(), nw.getWindowHandle());
                         if (EGL.EGL_NO_SURFACE == eglSurface) {
                             eglError0 = EGL.eglGetError();
                         }
@@ -99,34 +93,53 @@ public abstract class EGLDrawable extends GLDrawableImpl {
         if (EGL.EGL_NO_SURFACE == eglSurface) {
             throw new GLException("Creation of window surface failed: "+eglConfig+", "+surface+", error "+toHexString(eglError0));
         }
-
         if(DEBUG) {
-            System.err.println(getThreadName() + ": setSurface using component: handle "+toHexString(surface.getSurfaceHandle())+" -> "+toHexString(eglSurface));
+            System.err.println(getThreadName() + ": createEGLSurface handle "+toHexString(eglSurface));
         }
-        
-        ((MutableSurface)surface).setSurfaceHandle(eglSurface);
+        return eglSurface;
     }
 
     @Override
     protected final void updateHandle() {
-        if(ownEGLSurface) {
-            recreateSurface();
+        final EGLWrappedSurface eglws = (EGLWrappedSurface) surface;
+        if(DEBUG) {
+            System.err.println(getThreadName() + ": updateHandle of "+eglws);
+        }        
+        if( eglws.containsUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_SURFACE ) ) {
+            if( EGL.EGL_NO_SURFACE != eglws.getSurfaceHandle() ) {
+                throw new InternalError("Set surface but claimed to be invalid: "+eglws);
+            }
+            eglws.setSurfaceHandle( createEGLSurface() );
+        } else if( EGL.EGL_NO_SURFACE == eglws.getSurfaceHandle() ) {
+            throw new InternalError("Nil surface but claimed to be valid: "+eglws);
+        }
+    }
+    
+    protected void destroyHandle() {    
+        final EGLWrappedSurface eglws = (EGLWrappedSurface) surface;
+        if(DEBUG) {
+            System.err.println(getThreadName() + ": destroyHandle of "+eglws);
+        }        
+        if( EGL.EGL_NO_SURFACE == eglws.getSurfaceHandle() ) {
+            throw new InternalError("Nil surface but claimed to be valid: "+eglws);
+        }
+        final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) eglws.getGraphicsConfiguration().getScreen().getDevice();
+        if( eglws.containsUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_SURFACE ) ) {
+            EGL.eglDestroySurface(eglDevice.getHandle(), eglws.getSurfaceHandle());
+            eglws.setSurfaceHandle(EGL.EGL_NO_SURFACE);
         }
     }
 
-    protected static boolean isValidEGLSurface(EGLGraphicsDevice eglDevice, NativeSurface surface) {
-        final long eglDisplayHandle = eglDevice.getHandle();
-        if (EGL.EGL_NO_DISPLAY == eglDisplayHandle) {
-            throw new GLException("Invalid EGL display in EGLGraphicsDevice "+eglDevice);
+    protected static boolean isValidEGLSurface(long eglDisplayHandle, long surfaceHandle) {
+        if( 0 == surfaceHandle ) {
+            return false;
         }
-        boolean eglSurfaceValid = 0 != surface.getSurfaceHandle();
-        if(eglSurfaceValid) {
-            int[] tmp = new int[1];
-            eglSurfaceValid = EGL.eglQuerySurface(eglDisplayHandle, surface.getSurfaceHandle(), EGL.EGL_CONFIG_ID, tmp, 0);
-            if(!eglSurfaceValid) {
-                if(DEBUG) {
-                    System.err.println(getThreadName() + ": EGLDrawable.isValidEGLSurface eglQuerySuface failed: "+toHexString(EGL.eglGetError())+", "+surface);
-                }
+        final IntBuffer val = Buffers.newDirectIntBuffer(1);        
+        final boolean eglSurfaceValid = EGL.eglQuerySurface(eglDisplayHandle, surfaceHandle, EGL.EGL_CONFIG_ID, val);
+        if( !eglSurfaceValid ) {
+            final int eglErr = EGL.eglGetError();
+            if(DEBUG) {
+                System.err.println(getThreadName() + ": EGLDrawable.isValidEGLSurface eglQuerySuface failed: error "+toHexString(eglErr)+", "+toHexString(surfaceHandle));
             }
         }
         return eglSurfaceValid;
@@ -134,55 +147,19 @@ public abstract class EGLDrawable extends GLDrawableImpl {
     
     @Override
     protected final void setRealizedImpl() {
-        final EGLGraphicsConfiguration eglConfig = (EGLGraphicsConfiguration) surface.getGraphicsConfiguration();
-        final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) eglConfig.getScreen().getDevice();
-        if (realized) {
-            final boolean eglSurfaceValid = isValidEGLSurface(eglDevice, surface);
-            if(eglSurfaceValid) {
-                // surface holds valid EGLSurface
-                if(DEBUG) {
-                    System.err.println(getThreadName() + ": EGLDrawable.setRealizedImpl re-using component's EGLSurface: handle "+toHexString(surface.getSurfaceHandle()));
-                }
-                ownEGLSurface=false;
-            } else {
-                // EGLSurface is ours - subsequent updateHandle() will issue recreateSurface();
-                // However .. let's validate the surface object first
-                if( ! (surface instanceof ProxySurface) ) {
-                    throw new InternalError("surface not ProxySurface: "+surface.getClass().getName()+", "+surface);
-                }
-                final ProxySurface.UpstreamSurfaceHook upstreamHook = ((ProxySurface)surface).getUpstreamSurfaceHook();
-                if( null == upstreamHook ) {
-                    throw new InternalError("null upstreamHook of: "+surface);
-                }
-                if( ! (upstreamHook instanceof EGLUpstreamSurfaceHook) ) {
-                    throw new InternalError("upstreamHook not EGLUpstreamSurfaceHook: Surface: "+surface.getClass().getName()+", "+surface+"; UpstreamHook: "+upstreamHook.getClass().getName()+", "+upstreamHook);
-                }
-                if( null == ((EGLUpstreamSurfaceHook)upstreamHook).getUpstreamSurface() ) {
-                    throw new InternalError("null upstream surface");
-                }
-                ownEGLSurface=true;
-                if(DEBUG) {
-                    System.err.println(getThreadName() + ": EGLDrawable.setRealizedImpl owning EGLSurface");
-                }
-            }
-        } else if (ownEGLSurface && surface.getSurfaceHandle() != EGL.EGL_NO_SURFACE) {
-            if(DEBUG) {
-                System.err.println(getThreadName() + ": EGLDrawable.setRealized(false): ownSurface "+ownEGLSurface+", "+eglDevice+", eglSurface: "+toHexString(surface.getSurfaceHandle()));
-            }
-            // Destroy the window surface
-            if (!EGL.eglDestroySurface(eglDevice.getHandle(), surface.getSurfaceHandle())) {
-                throw new GLException("Error destroying window surface (eglDestroySurface)");
-            }
-            ((MutableSurface)surface).setSurfaceHandle(EGL.EGL_NO_SURFACE);
+        if(DEBUG) {
+            System.err.println(getThreadName() + ": EGLDrawable.setRealized("+realized+"): NOP - "+surface);
         }
     }
 
     @Override
-    protected final void swapBuffersImpl() {
-        final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) surface.getGraphicsConfiguration().getScreen().getDevice();
-        // single-buffer is already filtered out @ GLDrawableImpl#swapBuffers()
-        if(!EGL.eglSwapBuffers(eglDevice.getHandle(), surface.getSurfaceHandle())) {
-            throw new GLException("Error swapping buffers, eglError "+toHexString(EGL.eglGetError())+", "+this);
+    protected final void swapBuffersImpl(boolean doubleBuffered) {
+        if(doubleBuffered) {
+            final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) surface.getGraphicsConfiguration().getScreen().getDevice();
+            // single-buffer is already filtered out @ GLDrawableImpl#swapBuffers()
+            if(!EGL.eglSwapBuffers(eglDevice.getHandle(), surface.getSurfaceHandle())) {
+                throw new GLException("Error swapping buffers, eglError "+toHexString(EGL.eglGetError())+", "+this);
+            }
         }
     }
 
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
index 292eb17c8..e98d69140 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
@@ -52,8 +52,7 @@ import javax.media.nativewindow.MutableSurface;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.NativeWindowFactory;
 import javax.media.nativewindow.ProxySurface;
-import javax.media.nativewindow.ProxySurface.UpstreamSurfaceHook;
-import javax.media.nativewindow.VisualIDHolder.VIDType;
+import javax.media.nativewindow.UpstreamSurfaceHook;
 import javax.media.nativewindow.VisualIDHolder;
 import javax.media.opengl.GL;
 import javax.media.opengl.GLCapabilities;
@@ -65,6 +64,7 @@ import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.opengl.Debug;
 import jogamp.opengl.GLDrawableFactoryImpl;
 import jogamp.opengl.GLDrawableImpl;
@@ -76,10 +76,11 @@ import com.jogamp.common.nio.Buffers;
 import com.jogamp.common.nio.PointerBuffer;
 import com.jogamp.common.os.Platform;
 import com.jogamp.common.util.ReflectionUtil;
-import com.jogamp.nativewindow.WrappedSurface;
 import com.jogamp.nativewindow.egl.EGLGraphicsDevice;
 
 public class EGLDrawableFactory extends GLDrawableFactoryImpl {
+    protected static final boolean DEBUG = GLDrawableFactoryImpl.DEBUG;
+    
     /* package */ static final boolean QUERY_EGL_ES = !Debug.isPropertyDefined("jogl.debug.EGLDrawableFactory.DontQuery", true);
     /* package */ static final boolean QUERY_EGL_ES_NATIVE_TK = Debug.isPropertyDefined("jogl.debug.EGLDrawableFactory.QueryNativeTK", true);
     
@@ -112,7 +113,7 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
             } catch (JogampRuntimeException jre) { /* n/a .. */ }
         }
 
-        defaultDevice = new EGLGraphicsDevice(AbstractGraphicsDevice.DEFAULT_CONNECTION, AbstractGraphicsDevice.DEFAULT_UNIT);
+        defaultDevice = new EGLGraphicsDevice();
 
         // FIXME: Probably need to move EGL from a static model
         // to a dynamic one, where there can be 2 instances
@@ -310,6 +311,7 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
         try {            
             final GLCapabilities reqCapsAny = new GLCapabilities(glp);
             reqCapsAny.setRedBits(5); reqCapsAny.setGreenBits(5); reqCapsAny.setBlueBits(5); reqCapsAny.setAlphaBits(0);
+            reqCapsAny.setDoubleBuffered(false);
             final GLCapabilitiesImmutable reqCapsPBuffer = GLGraphicsConfigurationUtil.fixGLPBufferGLCapabilities(reqCapsAny);
             final List<GLCapabilitiesImmutable> availablePBufferCapsL = getAvailableEGLConfigs(sharedEGLDevice, reqCapsPBuffer);
             hasPBuffer[0] = availablePBufferCapsL.size() > 0;
@@ -324,18 +326,20 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
                 } else {
                     final List<GLCapabilitiesImmutable> capsAnyL = getAvailableEGLConfigs(eglDevice, reqCapsAny);
                     if(capsAnyL.size() > 0) {
-                        final GLCapabilitiesImmutable caps = capsAnyL.get(0);
-                        EGLContext.mapStaticGLESVersion(eglDevice, caps);
+                        final GLCapabilitiesImmutable chosenCaps = capsAnyL.get(0);
+                        EGLContext.mapStaticGLESVersion(eglDevice, chosenCaps);
                         if(eglDevice != adevice) {
-                            EGLContext.mapStaticGLESVersion(adevice, caps);
+                            EGLContext.mapStaticGLESVersion(adevice, chosenCaps);
                         }
+                        final EGLGraphicsDevice adeviceEGLDevice = new EGLGraphicsDevice(adevice.getHandle(), EGL.EGL_NO_DISPLAY, adevice.getConnection(), adevice.getUnitID(), null);
+                        EGLContext.mapStaticGLESVersion(adeviceEGLDevice, chosenCaps);
                         success = true;
                     }
                     if(DEBUG) {
                         System.err.println("EGLDrawableFactory.isEGLContextAvailable() no pbuffer config available, detected !pbuffer config: "+success);
                         EGLGraphicsConfigurationFactory.printCaps("!PBufferCaps", capsAnyL, System.err);
                     }                    
-                }
+                }                
             } else {
                 surface = desktopFactory.createDummySurface(adevice, reqCapsAny, null, 64, 64); // X11, WGL, .. dummy window
                 upstreamSurface = ( surface instanceof ProxySurface ) ? (ProxySurface)surface : null ;
@@ -361,6 +365,8 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
                                 if(eglDevice != adevice) {
                                     context.mapCurrentAvailableGLVersion(adevice);
                                 }
+                                final EGLGraphicsDevice adeviceEGLDevice = new EGLGraphicsDevice(adevice.getHandle(), EGL.EGL_NO_DISPLAY, adevice.getConnection(), adevice.getUnitID(), null);
+                                context.mapCurrentAvailableGLVersion(adeviceEGLDevice);
                                 success = true;
                             } else {
                                 // Oops .. something is wrong
@@ -538,70 +544,9 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
         if (target == null) {
           throw new IllegalArgumentException("Null target");
         }
-        return new EGLOnscreenDrawable(this, getEGLSurface(target));
+        return new EGLOnscreenDrawable(this, EGLWrappedSurface.get(target));
     }
     
-    protected static NativeSurface getEGLSurface(NativeSurface surface) {
-        AbstractGraphicsConfiguration aConfig = surface.getGraphicsConfiguration();
-        AbstractGraphicsDevice aDevice = aConfig.getScreen().getDevice();
-        if( aDevice instanceof EGLGraphicsDevice && aConfig instanceof EGLGraphicsConfiguration ) {
-            if(surface instanceof WrappedSurface) {
-                // already wrapped surface - no wrapped recursion
-                if(DEBUG) {
-                    System.err.println(getThreadName() + ": getEGLSurface - already wrapped surface - use as-is: "+surface);
-                }
-                return surface;
-            }
-            if(EGLDrawable.isValidEGLSurface((EGLGraphicsDevice)aDevice, surface)) {                 
-                // already in native EGL format
-                if(DEBUG) {
-                    System.err.println(getThreadName() + ": getEGLSurface - already valid EGL surface - use as-is: "+surface);
-                }
-                return surface;
-            }
-        }
-        // create EGL instance out of platform native types
-        final EGLGraphicsDevice eglDevice;
-        if( aDevice instanceof EGLGraphicsDevice ) {
-            eglDevice = (EGLGraphicsDevice) aDevice;
-            if(DEBUG) {
-                System.err.println(getThreadName() + ": getEGLSurface - Reusing eglDevice: "+eglDevice);
-            }
-            if(0 == eglDevice.getHandle()) {
-                eglDevice.open();
-            }
-        } else {
-            eglDevice = EGLDisplayUtil.eglCreateEGLGraphicsDevice(surface);            
-        }
-        final AbstractGraphicsScreen eglScreen = new DefaultGraphicsScreen(eglDevice, aConfig.getScreen().getIndex());
-        final GLCapabilitiesImmutable capsRequested = (GLCapabilitiesImmutable) aConfig.getRequestedCapabilities();
-        final EGLGraphicsConfiguration eglConfig;
-        if( aConfig instanceof EGLGraphicsConfiguration ) {
-            // Config is already in EGL type - reuse ..
-            final EGLGLCapabilities capsChosen = (EGLGLCapabilities) aConfig.getChosenCapabilities();
-            if( 0 == capsChosen.getEGLConfig() ) {
-                // 'refresh' the native EGLConfig handle
-                capsChosen.setEGLConfig(EGLGraphicsConfiguration.EGLConfigId2EGLConfig(eglDevice.getHandle(), capsChosen.getEGLConfigID()));
-                if( 0 == capsChosen.getEGLConfig() ) {
-                    throw new GLException("Refreshing native EGLConfig handle failed with error "+EGLContext.toHexString(EGL.eglGetError())+": "+eglDevice+", "+capsChosen+" of "+aConfig);
-                }
-            }
-            eglConfig  = new EGLGraphicsConfiguration(eglScreen, capsChosen, capsRequested, null);
-            if(DEBUG) {
-                System.err.println(getThreadName() + ": getEGLSurface - Reusing chosenCaps: "+eglConfig);
-            }
-        } else {
-            eglConfig = EGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(
-                    capsRequested, capsRequested, null, eglScreen, aConfig.getVisualID(VIDType.NATIVE), false);
-
-            if (null == eglConfig) {
-                throw new GLException("Couldn't create EGLGraphicsConfiguration from "+eglScreen);
-            } else if(DEBUG) {
-                System.err.println(getThreadName() + ": getEGLSurface - Chosen eglConfig: "+eglConfig);
-            }
-        }
-        return new WrappedSurface(eglConfig, EGL.EGL_NO_SURFACE, surface.getWidth(), surface.getHeight(), new EGLUpstreamSurfaceHook(surface));
-    }
     static String getThreadName() { return Thread.currentThread().getName(); }
 
     @Override
@@ -615,7 +560,7 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
             throw new GLException("Non pbuffer not yet implemented");
         }
         // PBuffer GLDrawable Creation
-        return new EGLPbufferDrawable(this, getEGLSurface(target));
+        return new EGLPbufferDrawable(this, EGLWrappedSurface.get(target));
     }
 
     @Override
@@ -628,20 +573,24 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
     @Override
     protected ProxySurface createMutableSurfaceImpl(AbstractGraphicsDevice deviceReq, boolean createNewDevice, 
                                                     GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested, 
-                                                    GLCapabilitiesChooser chooser, int width, int height, UpstreamSurfaceHook lifecycleHook) {
+                                                    GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstreamHook) {
+        final boolean ownDevice;
         final EGLGraphicsDevice device;
-        if(createNewDevice) {
-            final EGLGraphicsDevice eglDeviceReq = (EGLGraphicsDevice) deviceReq;
-            device = EGLDisplayUtil.eglCreateEGLGraphicsDevice(eglDeviceReq.getNativeDisplayID(), deviceReq.getConnection(), deviceReq.getUnitID());
+        if(createNewDevice || ! ( deviceReq instanceof EGLGraphicsDevice ) ) {
+            final long nativeDisplayID = ( deviceReq instanceof EGLGraphicsDevice) ?
+                    ( (EGLGraphicsDevice) deviceReq ).getNativeDisplayID() : deviceReq.getHandle() ;
+            device = EGLDisplayUtil.eglCreateEGLGraphicsDevice(nativeDisplayID, deviceReq.getConnection(), deviceReq.getUnitID());
+            ownDevice = true;
         } else {
             device = (EGLGraphicsDevice) deviceReq;
+            ownDevice = false;
         }
         final DefaultGraphicsScreen screen = new DefaultGraphicsScreen(device, 0);
         final EGLGraphicsConfiguration config = EGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsChosen, capsRequested, chooser, screen, VisualIDHolder.VID_UNDEFINED, false);
         if(null == config) {
             throw new GLException("Choosing GraphicsConfiguration failed w/ "+capsChosen+" on "+screen); 
         }    
-        return new WrappedSurface(config, 0, width, height, lifecycleHook);
+        return new WrappedSurface(config, 0, upstreamHook, ownDevice);
     }
     
     @Override
@@ -649,54 +598,9 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
                                                      GLCapabilitiesImmutable requestedCaps, GLCapabilitiesChooser chooser, int width, int height) {
         final GLCapabilitiesImmutable chosenCaps =
                 GLGraphicsConfigurationUtil.fixDoubleBufferedGLCapabilities(
-                        GLGraphicsConfigurationUtil.fixOffscreenGLCapabilities(requestedCaps, false, canCreateGLPbuffer(deviceReq)), 
-                        false);        
-        return createMutableSurfaceImpl(deviceReq, createNewDevice, chosenCaps, requestedCaps, chooser, width, height, dummySurfaceLifecycleHook);
+                        GLGraphicsConfigurationUtil.fixOffscreenGLCapabilities(requestedCaps, false, canCreateGLPbuffer(deviceReq)), false);        
+        return createMutableSurfaceImpl(deviceReq, createNewDevice, chosenCaps, requestedCaps, chooser, new EGLDummyUpstreamSurfaceHook(width, height));
     }
-    private static final ProxySurface.UpstreamSurfaceHook dummySurfaceLifecycleHook = new ProxySurface.UpstreamSurfaceHook() {
-        @Override
-        public final void create(ProxySurface s) {
-            if( EGL.EGL_NO_SURFACE == s.getSurfaceHandle() ) {
-                final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) s.getGraphicsConfiguration().getScreen().getDevice();
-                if(0 == eglDevice.getHandle()) {
-                    eglDevice.open();
-                    s.setImplBitfield(ProxySurface.OWN_DEVICE);
-                }
-                createPBufferSurfaceImpl(s, false);
-                if(DEBUG) {
-                    System.err.println("EGLDrawableFactory.dummySurfaceLifecycleHook.create: "+s);
-                }
-            }
-        }
-        @Override
-        public final void destroy(ProxySurface s) {
-            if( EGL.EGL_NO_SURFACE != s.getSurfaceHandle() ) {
-                final EGLGraphicsConfiguration config = (EGLGraphicsConfiguration) s.getGraphicsConfiguration();
-                final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) config.getScreen().getDevice();
-                EGL.eglDestroySurface(eglDevice.getHandle(), s.getSurfaceHandle());
-                s.setSurfaceHandle(EGL.EGL_NO_SURFACE);
-                if( 0 != ( ProxySurface.OWN_DEVICE & s.getImplBitfield() ) ) {
-                    eglDevice.close();
-                }
-                if(DEBUG) {
-                    System.err.println("EGLDrawableFactory.dummySurfaceLifecycleHook.create: "+s);
-                }
-            }
-        }
-        @Override
-        public final int getWidth(ProxySurface s) {
-            return s.initialWidth;
-        }
-        @Override
-        public final int getHeight(ProxySurface s) {
-            return s.initialHeight;
-        }
-        @Override
-        public String toString() {
-            return "EGLSurfaceLifecycleHook[]";
-        }
-        
-    };
     
     /**
      * @param ms {@link MutableSurface} which dimensions and config are being used to create the pbuffer surface. 
@@ -705,7 +609,9 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
      * @return the passed {@link MutableSurface} which now has the EGL pbuffer surface set as it's handle
      */
     protected static MutableSurface createPBufferSurfaceImpl(MutableSurface ms, boolean useTexture) {
-        final EGLGraphicsConfiguration config = (EGLGraphicsConfiguration) ms.getGraphicsConfiguration();
+        return null;
+    }
+    protected static long createPBufferSurfaceImpl(EGLGraphicsConfiguration config, int width, int height, boolean useTexture) {
         final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) config.getScreen().getDevice();
         final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) config.getChosenCapabilities();
         final int texFormat;
@@ -720,15 +626,14 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
           System.out.println("Pbuffer config: " + config);
         }
 
-        final int[] attrs = EGLGraphicsConfiguration.CreatePBufferSurfaceAttribList(ms.getWidth(), ms.getHeight(), texFormat);
+        final int[] attrs = EGLGraphicsConfiguration.CreatePBufferSurfaceAttribList(width, height, texFormat);
         final long surf = EGL.eglCreatePbufferSurface(eglDevice.getHandle(), config.getNativeConfig(), attrs, 0);
         if (EGL.EGL_NO_SURFACE==surf) {
-            throw new GLException("Creation of window surface (eglCreatePbufferSurface) failed, dim "+ms.getWidth()+"x"+ms.getHeight()+", error 0x"+Integer.toHexString(EGL.eglGetError()));
+            throw new GLException("Creation of window surface (eglCreatePbufferSurface) failed, dim "+width+"x"+height+", "+eglDevice+", "+config+", error 0x"+Integer.toHexString(EGL.eglGetError()));
         } else if(DEBUG) {
             System.err.println("PBuffer setSurface result: eglSurface 0x"+Long.toHexString(surf));
         }
-        ms.setSurfaceHandle(surf);
-        return ms;
+        return surf;
     }
 
     @Override
@@ -737,7 +642,7 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
         final EGLGraphicsDevice device = EGLDisplayUtil.eglCreateEGLGraphicsDevice(eglDeviceReq.getNativeDisplayID(), deviceReq.getConnection(), deviceReq.getUnitID());
         final DefaultGraphicsScreen screen = new DefaultGraphicsScreen(device, screenIdx);
         final EGLGraphicsConfiguration cfg = EGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsRequested, capsRequested, chooser, screen, VisualIDHolder.VID_UNDEFINED, false);
-        return new WrappedSurface(cfg, windowHandle, 0, 0, upstream);
+        return new WrappedSurface(cfg, windowHandle, upstream, true);
     }
 
     @Override
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLDummyUpstreamSurfaceHook.java b/src/jogl/classes/jogamp/opengl/egl/EGLDummyUpstreamSurfaceHook.java
new file mode 100644
index 000000000..b172d4f35
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLDummyUpstreamSurfaceHook.java
@@ -0,0 +1,49 @@
+package jogamp.opengl.egl;
+
+import javax.media.nativewindow.NativeSurface;
+import javax.media.nativewindow.ProxySurface;
+import javax.media.nativewindow.UpstreamSurfaceHook;
+
+import com.jogamp.nativewindow.UpstreamSurfaceHookMutableSize;
+import com.jogamp.nativewindow.egl.EGLGraphicsDevice;
+
+public class EGLDummyUpstreamSurfaceHook extends UpstreamSurfaceHookMutableSize {
+    /**
+     * @param width the initial width as returned by {@link NativeSurface#getWidth()} via {@link UpstreamSurfaceHook#getWidth(ProxySurface)}, 
+     *        not the actual dummy surface width. 
+     *        The latter is platform specific and small
+     * @param height the initial height as returned by {@link NativeSurface#getHeight()} via {@link UpstreamSurfaceHook#getHeight(ProxySurface)}, 
+     *        not the actual dummy surface height,
+     *        The latter is platform specific and small
+     */
+    public EGLDummyUpstreamSurfaceHook(int width, int height) {
+        super(width, height);
+    }
+    
+    @Override
+    public final void create(ProxySurface s) {
+        final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) s.getGraphicsConfiguration().getScreen().getDevice();
+        if(0 == eglDevice.getHandle()) {
+            eglDevice.open();
+            s.addUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_DEVICE );
+        }
+        if( EGL.EGL_NO_SURFACE == s.getSurfaceHandle() ) {
+            s.setSurfaceHandle( EGLDrawableFactory.createPBufferSurfaceImpl((EGLGraphicsConfiguration)s.getGraphicsConfiguration(), 64, 64, false) );
+            s.addUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_SURFACE );            
+        }
+        s.addUpstreamOptionBits(ProxySurface.OPT_UPSTREAM_WINDOW_INVISIBLE);
+    }
+    
+    @Override
+    public final void destroy(ProxySurface s) {
+        if( s.containsUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_SURFACE ) ) {
+            final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) s.getGraphicsConfiguration().getScreen().getDevice();
+            if( EGL.EGL_NO_SURFACE == s.getSurfaceHandle() ) {
+                throw new InternalError("Owns upstream surface, but no EGL surface: "+s);
+            }
+            EGL.eglDestroySurface(eglDevice.getHandle(), s.getSurfaceHandle());
+            s.setSurfaceHandle(EGL.EGL_NO_SURFACE);
+            s.clearUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_SURFACE );
+        }
+    }
+}
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLExternalContext.java b/src/jogl/classes/jogamp/opengl/egl/EGLExternalContext.java
index 585638d21..84bd705db 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLExternalContext.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLExternalContext.java
@@ -79,15 +79,4 @@ public class EGLExternalContext extends EGLContext {
     @Override
     protected void destroyImpl() throws GLException {
     }
-
-    @Override
-    public void bindPbufferToTexture() {
-        throw new GLException("Should not call this");
-    }
-
-    @Override
-    public void releasePbufferFromTexture() {
-        throw new GLException("Should not call this");
-    }
-
 }
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLGLCapabilities.java b/src/jogl/classes/jogamp/opengl/egl/EGLGLCapabilities.java
index e513a86cf..f857c6b5c 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLGLCapabilities.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLGLCapabilities.java
@@ -57,8 +57,8 @@ public class EGLGLCapabilities extends GLCapabilities {
       this.eglcfg = eglcfg;
       this.eglcfgid = eglcfgid;
       if(!isCompatible(glp, renderableType)) {
-          throw new GLException("Incompatible "+glp+
-                                " with EGL-RenderableType["+renderableTypeToString(null, renderableType)+"]");
+          throw new GLException("Requested GLProfile "+glp+
+                                " not compatible with EGL-RenderableType["+renderableTypeToString(null, renderableType)+"]");
       }
       this.renderableType = renderableType;
       this.nativeVisualID = visualID;
@@ -131,6 +131,7 @@ public class EGLGLCapabilities extends GLCapabilities {
         sink = new StringBuilder();
     }
     boolean first=true;
+    sink.append("0x").append(Integer.toHexString(renderableType)).append(": ");
     if(0 != (renderableType & EGL.EGL_OPENGL_BIT)) {
         sink.append("GL"); first=false;
     }
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLGraphicsConfiguration.java b/src/jogl/classes/jogamp/opengl/egl/EGLGraphicsConfiguration.java
index 8ee98072f..7bf201238 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLGraphicsConfiguration.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLGraphicsConfiguration.java
@@ -211,6 +211,13 @@ public class EGLGraphicsConfiguration extends MutableGraphicsConfiguration imple
             if(null == glp) {
                 glp = EGLGLCapabilities.getCompatible(device, rType);
             }
+            if(!EGLGLCapabilities.isCompatible(glp, rType)) {
+                if(DEBUG) {
+                    System.err.println("config "+toHexString(config)+": Requested GLProfile "+glp+
+                                " not compatible with EGL-RenderableType["+EGLGLCapabilities.renderableTypeToString(null, rType)+"]");
+                }
+                return null;
+            }
             caps = new EGLGLCapabilities(config, cfgID, visualID, glp, rType);
         } catch (GLException gle) {
             if(DEBUG) {
@@ -288,7 +295,7 @@ public class EGLGraphicsConfiguration extends MutableGraphicsConfiguration imple
             return null;
         }
         
-        return (EGLGLCapabilities) GLGraphicsConfigurationUtil.setWinAttributeBits(caps, drawableTypeBits);
+        return (EGLGLCapabilities) GLGraphicsConfigurationUtil.fixWinAttribBitsAndHwAccel(device, drawableTypeBits, caps); 
     }
 
     public static int[] GLCapabilities2AttribList(GLCapabilitiesImmutable caps) {
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenContext.java b/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenContext.java
index eae47fa92..325ad6142 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenContext.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenContext.java
@@ -41,16 +41,5 @@ public class EGLOnscreenContext extends EGLContext {
     public EGLOnscreenContext(EGLOnscreenDrawable drawable, GLContext shareWith) {
         super(drawable, shareWith);
     }
-
-    @Override
-    public void bindPbufferToTexture() {
-        throw new GLException("Should not call this");
-    }
-
-    @Override
-    public void releasePbufferFromTexture() {
-        throw new GLException("Should not call this");
-    }
-
 }
 
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenDrawable.java b/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenDrawable.java
index d54057775..6440cf1e5 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLOnscreenDrawable.java
@@ -54,8 +54,8 @@ public class EGLOnscreenDrawable extends EGLDrawable {
     }
 
     @Override
-    protected long createSurface(EGLGraphicsConfiguration config, long nativeSurfaceHandle) {
+    protected long createSurface(EGLGraphicsConfiguration config, int width, int height, long nativeSurfaceHandle) {    
         return EGL.eglCreateWindowSurface(config.getScreen().getDevice().getHandle(), config.getNativeConfig(), nativeSurfaceHandle, null);
-    }
+    }    
 }
 
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLPbufferContext.java b/src/jogl/classes/jogamp/opengl/egl/EGLPbufferContext.java
index 7175d516f..bb9eeb892 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLPbufferContext.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLPbufferContext.java
@@ -46,15 +46,5 @@ public class EGLPbufferContext extends EGLContext {
     public int getFloatingPointMode() {
         return 0; // FIXME ??
     }
-
-    @Override
-    public void bindPbufferToTexture() {
-        throw new GLException("Not yet implemented");
-    }
-
-    @Override
-    public void releasePbufferFromTexture() {
-        throw new GLException("Not yet implemented");
-    }
 }
 
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLPbufferDrawable.java b/src/jogl/classes/jogamp/opengl/egl/EGLPbufferDrawable.java
index 4a36625bd..eb7e320c8 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLPbufferDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLPbufferDrawable.java
@@ -52,12 +52,8 @@ public class EGLPbufferDrawable extends EGLDrawable {
     }
 
     @Override
-    protected long createSurface(EGLGraphicsConfiguration config, long nativeSurfaceHandle) {
-        final MutableSurface ms = (MutableSurface)getNativeSurface();
-        if(config != ms.getGraphicsConfiguration()) {
-            throw new InternalError("Not same: "+config.hashCode()+", "+ms.getGraphicsConfiguration()+": "+config+", "+ms.getGraphicsConfiguration());
-        }
-        return EGLDrawableFactory.createPBufferSurfaceImpl(ms, useTexture).getSurfaceHandle();
+    protected long createSurface(EGLGraphicsConfiguration config, int width, int height, long nativeSurfaceHandle) {
+        return EGLDrawableFactory.createPBufferSurfaceImpl(config, width, height, false);
     }
 
     @Override
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLUpstreamSurfaceHook.java b/src/jogl/classes/jogamp/opengl/egl/EGLUpstreamSurfaceHook.java
index 42c6e100e..342c4c417 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLUpstreamSurfaceHook.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLUpstreamSurfaceHook.java
@@ -1,38 +1,163 @@
 package jogamp.opengl.egl;
 
+import javax.media.nativewindow.AbstractGraphicsConfiguration;
+import javax.media.nativewindow.AbstractGraphicsDevice;
+import javax.media.nativewindow.AbstractGraphicsScreen;
+import javax.media.nativewindow.DefaultGraphicsScreen;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.ProxySurface;
+import javax.media.nativewindow.UpstreamSurfaceHook;
+import javax.media.nativewindow.VisualIDHolder.VIDType;
+import javax.media.opengl.GLCapabilitiesImmutable;
 import javax.media.opengl.GLException;
 
 import com.jogamp.nativewindow.egl.EGLGraphicsDevice;
 
-public class EGLUpstreamSurfaceHook implements ProxySurface.UpstreamSurfaceHook {
+public class EGLUpstreamSurfaceHook implements UpstreamSurfaceHook.MutableSize {
+    protected static final boolean DEBUG = EGLDrawableFactory.DEBUG;
     private final NativeSurface upstreamSurface;
+    private final UpstreamSurfaceHook.MutableSize upstreamSurfaceHookMutableSize; 
     
     public EGLUpstreamSurfaceHook(NativeSurface upstream) {
         upstreamSurface = upstream;
+        if(upstreamSurface instanceof ProxySurface) {
+            final UpstreamSurfaceHook ush = ((ProxySurface)upstreamSurface).getUpstreamSurfaceHook();
+            if(ush instanceof UpstreamSurfaceHook.MutableSize) {
+                // offscreen NativeSurface w/ MutableSize (default)
+                upstreamSurfaceHookMutableSize = (UpstreamSurfaceHook.MutableSize) ush;
+            } else {
+                upstreamSurfaceHookMutableSize = null;
+            }
+        } else {
+            upstreamSurfaceHookMutableSize = null;
+        }
     }
     
     public final NativeSurface getUpstreamSurface() { return upstreamSurface; }
     
+    static String getThreadName() { return Thread.currentThread().getName(); }
+    
+    public final void setSize(int width, int height) {
+        if(null != upstreamSurfaceHookMutableSize) {
+            upstreamSurfaceHookMutableSize.setSize(width, height);
+        }        
+    }
+    
     @Override
     public final void create(ProxySurface surface) {
+        final String dbgPrefix;
+        if(DEBUG) {
+            dbgPrefix = getThreadName() + ": EGLUpstreamSurfaceHook.create("+surface.getClass().getSimpleName()+"): "; 
+            System.err.println(dbgPrefix+this);            
+        } else {
+            dbgPrefix = null;
+        }
+        
         if(upstreamSurface instanceof ProxySurface) {
+            // propagate createNotify(..) so upstreamSurface will be created 
             ((ProxySurface)upstreamSurface).createNotify();
-            if(NativeSurface.LOCK_SURFACE_NOT_READY >= upstreamSurface.lockSurface()) {
-                throw new GLException("Could not lock: "+upstreamSurface);
+        }
+        
+        // lock upstreamSurface, so it can be used in case EGLDisplay is derived from it!
+        if(NativeSurface.LOCK_SURFACE_NOT_READY >= upstreamSurface.lockSurface()) {
+            throw new GLException("Could not lock: "+upstreamSurface);
+        }
+        try {
+            evalUpstreamSurface(dbgPrefix, surface);
+        } finally {
+            upstreamSurface.unlockSurface();
+        }        
+    }
+    
+    private final void evalUpstreamSurface(String dbgPrefix, ProxySurface surface) {
+        //
+        // evaluate nature of upstreamSurface, may create EGL instances if required
+        //
+        
+        boolean isEGLSurfaceValid = true; // assume yes
+        
+        final AbstractGraphicsConfiguration aConfig = upstreamSurface.getGraphicsConfiguration();        
+        final AbstractGraphicsDevice aDevice = aConfig.getScreen().getDevice();
+        
+        final EGLGraphicsDevice eglDevice;
+        if( aDevice instanceof EGLGraphicsDevice ) {
+            eglDevice = (EGLGraphicsDevice) aDevice;
+            if(DEBUG) {
+                System.err.println(dbgPrefix+"Reusing eglDevice: "+eglDevice);
+            }
+            if(EGL.EGL_NO_DISPLAY == eglDevice.getHandle()) {
+                eglDevice.open();
+                isEGLSurfaceValid = false;
+                surface.addUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_DEVICE );
+            }
+        } else {
+            eglDevice = EGLDisplayUtil.eglCreateEGLGraphicsDevice(upstreamSurface);
+            isEGLSurfaceValid = false;
+            surface.addUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_DEVICE );                
+        }
+        
+        final GLCapabilitiesImmutable capsRequested = (GLCapabilitiesImmutable) aConfig.getRequestedCapabilities();
+        final EGLGraphicsConfiguration eglConfig;
+        if( aConfig instanceof EGLGraphicsConfiguration ) {
+            // Config is already in EGL type - reuse ..
+            final EGLGLCapabilities capsChosen = (EGLGLCapabilities) aConfig.getChosenCapabilities();
+            if( !isEGLSurfaceValid || !EGLGraphicsConfiguration.isEGLConfigValid(eglDevice.getHandle(), capsChosen.getEGLConfig()) ) { 
+                // 'refresh' the native EGLConfig handle
+                capsChosen.setEGLConfig(EGLGraphicsConfiguration.EGLConfigId2EGLConfig(eglDevice.getHandle(), capsChosen.getEGLConfigID()));
+                if( 0 == capsChosen.getEGLConfig() ) {
+                    throw new GLException("Refreshing native EGLConfig handle failed with error "+EGLContext.toHexString(EGL.eglGetError())+": "+eglDevice+", "+capsChosen+" of "+aConfig);
+                }
+                final AbstractGraphicsScreen eglScreen = new DefaultGraphicsScreen(eglDevice, aConfig.getScreen().getIndex());
+                eglConfig  = new EGLGraphicsConfiguration(eglScreen, capsChosen, capsRequested, null);
+                if(DEBUG) {
+                    System.err.println(dbgPrefix+"Refreshing eglConfig: "+eglConfig);
+                }
+                isEGLSurfaceValid = false;
+            } else {
+                eglConfig = (EGLGraphicsConfiguration) aConfig;
+                if(DEBUG) {
+                    System.err.println(dbgPrefix+"Reusing eglConfig: "+eglConfig);
+                }
+            }
+        } else {
+            final AbstractGraphicsScreen eglScreen = new DefaultGraphicsScreen(eglDevice, aConfig.getScreen().getIndex());
+            eglConfig = EGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(
+                    capsRequested, capsRequested, null, eglScreen, aConfig.getVisualID(VIDType.NATIVE), false);
+
+            if (null == eglConfig) {
+                throw new GLException("Couldn't create EGLGraphicsConfiguration from "+eglScreen);
+            } else if(DEBUG) {
+                System.err.println(dbgPrefix+"Chosen eglConfig: "+eglConfig);
             }
+            isEGLSurfaceValid = false;
         }
-        final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) surface.getGraphicsConfiguration().getScreen().getDevice();
-        eglDevice.open();
+        surface.setGraphicsConfiguration(eglConfig);
+        
+        if(isEGLSurfaceValid) {
+            isEGLSurfaceValid = EGLDrawable.isValidEGLSurface(eglDevice.getHandle(), upstreamSurface.getSurfaceHandle());
+        }
+        if(isEGLSurfaceValid) {
+            surface.setSurfaceHandle(upstreamSurface.getSurfaceHandle());
+            surface.clearUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_SURFACE );
+            if(DEBUG) {
+                System.err.println(dbgPrefix+"Fin: Already valid EGL surface - use as-is: "+upstreamSurface);
+            }
+        } else {
+            surface.setSurfaceHandle(EGL.EGL_NO_SURFACE);
+            surface.addUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_SURFACE ); // create/destroy in EGLDrawable
+            if(DEBUG) {
+                System.err.println(dbgPrefix+"Fin: EGL surface n/a - TBD: "+upstreamSurface);
+            }
+        }        
     }
 
     @Override
     public final void destroy(ProxySurface surface) {
-        final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) surface.getGraphicsConfiguration().getScreen().getDevice();
-        eglDevice.close();
+        if(EGLDrawableFactory.DEBUG) {
+            System.err.println("EGLUpstreamSurfaceHook.destroy("+surface.getClass().getSimpleName()+"): "+this);            
+        }
+        surface.clearUpstreamOptionBits( ProxySurface.OPT_PROXY_OWNS_UPSTREAM_SURFACE );            
         if(upstreamSurface instanceof ProxySurface) {
-            upstreamSurface.unlockSurface();
             ((ProxySurface)upstreamSurface).destroyNotify();
         }
     }
@@ -49,8 +174,8 @@ public class EGLUpstreamSurfaceHook implements ProxySurface.UpstreamSurfaceHook
     
     @Override
     public String toString() {
-        final String us_s = null != upstreamSurface ? ( upstreamSurface.getClass().getName() + ": " + upstreamSurface ) : "nil"; 
-        return "EGLUpstreamSurfaceHook[upstream: "+us_s+"]";
+        final String us_s = null != upstreamSurface ? ( upstreamSurface.getClass().getName() + ": 0x" + Long.toHexString(upstreamSurface.getSurfaceHandle()) ) : "nil";
+        return "EGLUpstreamSurfaceHook[ "+ upstreamSurface.getWidth() + "x" + upstreamSurface.getHeight() + ", " + us_s+ "]";
     }
 
 }
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLWrappedSurface.java b/src/jogl/classes/jogamp/opengl/egl/EGLWrappedSurface.java
new file mode 100644
index 000000000..b36303392
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLWrappedSurface.java
@@ -0,0 +1,26 @@
+package jogamp.opengl.egl;
+
+import javax.media.nativewindow.NativeSurface;
+
+import jogamp.nativewindow.WrappedSurface;
+
+public class EGLWrappedSurface extends WrappedSurface {
+
+    public static EGLWrappedSurface get(NativeSurface surface) {
+        if(surface instanceof EGLWrappedSurface) {
+            return (EGLWrappedSurface)surface;
+        }
+        return new EGLWrappedSurface(surface);
+    }
+    
+    public EGLWrappedSurface(NativeSurface surface) {
+        super(surface.getGraphicsConfiguration(), EGL.EGL_NO_SURFACE, new EGLUpstreamSurfaceHook(surface), false /* tbd in UpstreamSurfaceHook */);
+        if(EGLDrawableFactory.DEBUG) {
+            System.err.println("EGLWrappedSurface.ctor(): "+this);            
+        }
+    }
+
+    public final NativeSurface getUpstreamSurface() { 
+        return ((EGLUpstreamSurfaceHook)super.getUpstreamSurfaceHook()).getUpstreamSurface(); 
+    }    
+}
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
index 55aea3a98..ec29558d1 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
@@ -49,6 +49,7 @@ import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.NativeWindowFactory;
 import javax.media.nativewindow.OffscreenLayerSurface;
 import javax.media.nativewindow.ProxySurface;
+import javax.media.opengl.GL;
 import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLCapabilitiesImmutable;
 import javax.media.opengl.GLContext;
@@ -58,6 +59,7 @@ import javax.media.opengl.GLProfile;
 import jogamp.nativewindow.macosx.OSXUtil;
 import jogamp.opengl.GLContextImpl;
 import jogamp.opengl.GLDrawableImpl;
+import jogamp.opengl.GLFBODrawableImpl;
 import jogamp.opengl.GLGraphicsConfigurationUtil;
 import jogamp.opengl.macosx.cgl.MacOSXCGLDrawable.GLBackendType;
 
@@ -76,9 +78,11 @@ public abstract class MacOSXCGLContext extends GLContextImpl
         boolean isNSContext();
         long create(long share, int ctp, int major, int minor);
         boolean destroy(long ctx);
+        boolean contextRealized(boolean realized);
         boolean copyImpl(long src, int mask);
         boolean makeCurrent(long ctx);
         boolean release(long ctx);
+        boolean detachPBuffer();
         boolean setSwapInterval(int interval);
         boolean swapBuffers();
   }
@@ -279,7 +283,24 @@ public abstract class MacOSXCGLContext extends GLContextImpl
         throw new GLException("Error destroying OpenGL Context: "+this);
     }
   }
+  
+  @Override
+  protected void contextRealized(boolean realized) {
+      // context stuff depends on drawable stuff
+      if(realized) {
+          super.contextRealized(true);   // 1) init drawable stuff
+          impl.contextRealized(true);    // 2) init context stuff
+      } else {
+          impl.contextRealized(false);   // 1) free context stuff
+          super.contextRealized(false);  // 2) free drawable stuff
+      }
+  }
+
+  /* pp */ void detachPBuffer() {
+      impl.detachPBuffer();
+  }
 
+  
   @Override
   protected void copyImpl(GLContext source, int mask) throws GLException {
     if( isNSContext() != ((MacOSXCGLContext)source).isNSContext() ) {
@@ -365,16 +386,6 @@ public abstract class MacOSXCGLContext extends GLContextImpl
     throw new GLException("Should not call this");
   }
 
-  @Override
-  public void bindPbufferToTexture() {
-    throw new GLException("Should not call this");
-  }
-
-  @Override
-  public void releasePbufferFromTexture() {
-    throw new GLException("Should not call this");
-  }
-
   // Support for "mode switching" as described in MacOSXCGLDrawable
   public void setOpenGLMode(GLBackendType mode) {
       if (mode == openGLMode) {
@@ -421,323 +432,486 @@ public abstract class MacOSXCGLContext extends GLContextImpl
 
   // NSOpenGLContext-based implementation
   class NSOpenGLImpl implements GLBackendImpl {
-    long nsOpenGLLayer = 0;
-    long nsOpenGLLayerPFmt = 0;
-    float screenVSyncTimeout; // microSec
-    int vsyncTimeout;    // microSec - for nsOpenGLLayer mode
-
-    @Override
-    public boolean isNSContext() { return true; }
-
-    @Override
-    public long create(long share, int ctp, int major, int minor) {
-        long ctx = 0;
-        final long nsViewHandle;
-        if(drawable instanceof MacOSXCGLDrawable) {
-            // we allow null here! (special pbuffer case)
-            nsViewHandle = ((MacOSXCGLDrawable)MacOSXCGLContext.this.drawable).getNSViewHandle();
-        } else {
-            // we only allow a valid NSView here
-            final long aHandle = drawable.getHandle();
-            if( OSXUtil.isNSView(aHandle) ) {
-                nsViewHandle = aHandle;
-            } else {
-                throw new RuntimeException("Anonymous drawable instance's handle not of type NSView: "+drawable.getClass().getName()+", "+drawable);
-            }
-        }
-        final NativeSurface surface = drawable.getNativeSurface();        
-        final MacOSXCGLGraphicsConfiguration config = (MacOSXCGLGraphicsConfiguration) surface.getGraphicsConfiguration();
-        final OffscreenLayerSurface backingLayerHost = NativeWindowFactory.getOffscreenLayerSurface(surface, true);
-        
-        boolean allowIncompleteView = null != backingLayerHost;
-        if( !allowIncompleteView && surface instanceof ProxySurface ) {
-            allowIncompleteView = 0 != ( ProxySurface.INVISIBLE_WINDOW & ((ProxySurface)surface).getImplBitfield() ) ;
-        }
-        final GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable) config.getChosenCapabilities();
-        long pixelFormat = MacOSXCGLGraphicsConfiguration.GLCapabilities2NSPixelFormat(chosenCaps, ctp, major, minor);
-        if (pixelFormat == 0) {
-          if(DEBUG) {
-                System.err.println("Unable to allocate pixel format with requested GLCapabilities: "+chosenCaps);
-          }
-          return 0;
-        }
-        config.setChosenPixelFormat(pixelFormat);
-        int sRefreshRate = CGL.getScreenRefreshRate(drawable.getNativeSurface().getGraphicsConfiguration().getScreen().getIndex());
-        screenVSyncTimeout = 1000000f / sRefreshRate;
-        if(DEBUG) {
-            System.err.println("NS create OSX>=lion "+isLionOrLater);
-            System.err.println("NS create allowIncompleteView: "+allowIncompleteView);
-            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));
-            System.err.println("NS create drawable native-handle: "+toHexString(drawable.getHandle()));
-            System.err.println("NS create drawable NSView-handle: "+toHexString(nsViewHandle));
-            System.err.println("NS create screen refresh-rate: "+sRefreshRate+" hz, "+screenVSyncTimeout+" micros");
-            // Thread.dumpStack();
-        }
-        try {
-          int[] viewNotReady = new int[1];
-          // Try to allocate a context with this
-          ctx = CGL.createContext(share,
-                                  nsViewHandle, allowIncompleteView,
-                                  pixelFormat,
-                                  chosenCaps.isBackgroundOpaque(),
-                                  viewNotReady, 0);
-          if (0 == ctx) {
-            if(DEBUG) {
-                System.err.println("NS create failed: viewNotReady: "+ (1 == viewNotReady[0]));
-            }
-            return 0;
-          }
+      private OffscreenLayerSurface backingLayerHost = null;
+      private long nsOpenGLLayer = 0;
+      private long nsOpenGLLayerPFmt = 0;
+      private float screenVSyncTimeout; // microSec
+      private int vsyncTimeout;    // microSec - for nsOpenGLLayer mode
+      private int lastWidth=0, lastHeight=0; // allowing to detect size change
+      private long lastPBufferHandle = 0; // allowing to detect pbuffer recreation
+
+      @Override
+      public boolean isNSContext() { return true; }
+
+      @Override
+      public long create(long share, int ctp, int major, int minor) {
+          long ctx = 0;
+          final NativeSurface surface = drawable.getNativeSurface();        
+          final MacOSXCGLGraphicsConfiguration config = (MacOSXCGLGraphicsConfiguration) surface.getGraphicsConfiguration();
+          final GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable) config.getChosenCapabilities();
+          final long nsViewHandle;
+          final boolean isPBuffer;
+          final boolean isFBO;
+          if(drawable instanceof GLFBODrawableImpl) {
+              nsViewHandle = 0;
+              isPBuffer = false;
+              isFBO = true;
+              if(DEBUG) {
+                  System.err.println("NS create GLFBODrawableImpl drawable: isFBO "+isFBO+", isPBuffer "+isPBuffer+", "+drawable.getClass().getName()+",\n\t"+drawable);
+              }
+          } else if(drawable instanceof MacOSXCGLDrawable) {
+              // we allow null here! (special pbuffer case)
+              nsViewHandle = ((MacOSXCGLDrawable)MacOSXCGLContext.this.drawable).getNSViewHandle();
+              isPBuffer = CGL.isNSOpenGLPixelBuffer(drawable.getHandle());
+              isFBO = false;
+              if(DEBUG) {
+                  System.err.println("NS create MacOSXCGLDrawable drawable handle isFBO "+isFBO+", isPBuffer "+isPBuffer+", "+drawable.getClass().getName()+",\n\t"+drawable);
+              }
+          } else {
+              // we only allow a valid NSView here
+              final long drawableHandle = drawable.getHandle();
+              final boolean isNSView = OSXUtil.isNSView(drawableHandle);
+              final boolean isNSWindow = OSXUtil.isNSWindow(drawableHandle);
+              isPBuffer = CGL.isNSOpenGLPixelBuffer(drawableHandle);
+              isFBO = false;
 
-          if (!chosenCaps.isPBuffer() && !chosenCaps.isBackgroundOpaque()) {
-              // Set the context opacity
-              CGL.setContextOpacity(ctx, 0);
+              if(DEBUG) {
+                  System.err.println("NS create Anonymous drawable handle "+toHexString(drawableHandle)+": isNSView "+isNSView+", isNSWindow "+isNSWindow+", isFBO "+isFBO+", isPBuffer "+isPBuffer+", "+drawable.getClass().getName()+",\n\t"+drawable);
+              }
+              if( isNSView ) {
+                  nsViewHandle = drawableHandle;
+              } else if( isNSWindow ) {
+                  nsViewHandle = OSXUtil.GetNSView(drawableHandle);
+              } else if( isPBuffer ) {
+                  nsViewHandle = 0;
+              } else {
+                  throw new RuntimeException("Anonymous drawable instance's handle neither NSView, NSWindow nor PBuffer: "+toHexString(drawableHandle)+", "+drawable.getClass().getName()+",\n\t"+drawable);
+              }
           }
+          backingLayerHost = NativeWindowFactory.getOffscreenLayerSurface(surface, true);
 
+          boolean allowIncompleteView = null != backingLayerHost;
+          if( !allowIncompleteView && surface instanceof ProxySurface ) {
+              allowIncompleteView = ((ProxySurface)surface).containsUpstreamOptionBits( ProxySurface.OPT_UPSTREAM_WINDOW_INVISIBLE );
+          }
+          long pixelFormat = MacOSXCGLGraphicsConfiguration.GLCapabilities2NSPixelFormat(chosenCaps, ctp, major, minor);
+          if (pixelFormat == 0) {
+              if(DEBUG) {
+                  System.err.println("Unable to allocate pixel format with requested GLCapabilities: "+chosenCaps);
+              }
+              return 0;
+          }
           GLCapabilities fixedCaps = MacOSXCGLGraphicsConfiguration.NSPixelFormat2GLCapabilities(chosenCaps.getGLProfile(), pixelFormat);
-          fixedCaps = GLGraphicsConfigurationUtil.fixOpaqueGLCapabilities(fixedCaps, chosenCaps.isBackgroundOpaque());
-          if(!fixedCaps.isPBuffer()) {
+          if(chosenCaps.isOnscreen() || !fixedCaps.isPBuffer()) {
               // not handled, so copy them
               fixedCaps.setFBO(chosenCaps.isFBO());
+              fixedCaps.setPBuffer(chosenCaps.isPBuffer());
               fixedCaps.setBitmap(chosenCaps.isBitmap());
               fixedCaps.setOnscreen(chosenCaps.isOnscreen());
           }
-          config.setChosenCapabilities(fixedCaps);
+          fixedCaps = GLGraphicsConfigurationUtil.fixOpaqueGLCapabilities(fixedCaps, chosenCaps.isBackgroundOpaque());
+          int sRefreshRate = OSXUtil.GetScreenRefreshRate(drawable.getNativeSurface().getGraphicsConfiguration().getScreen().getIndex());
+          screenVSyncTimeout = 1000000f / sRefreshRate;
           if(DEBUG) {
+              System.err.println("NS create OSX>=lion "+isLionOrLater);
+              System.err.println("NS create allowIncompleteView: "+allowIncompleteView);
+              System.err.println("NS create backingLayerHost: "+backingLayerHost);
+              System.err.println("NS create share: "+share);
+              System.err.println("NS create drawable type: "+drawable.getClass().getName());
+              System.err.println("NS create drawable handle: isPBuffer "+isPBuffer+", isFBO "+isFBO);
+              System.err.println("NS create pixelFormat: "+toHexString(pixelFormat));
+              System.err.println("NS create chosenCaps: "+chosenCaps);
               System.err.println("NS create fixedCaps: "+fixedCaps);
+              System.err.println("NS create drawable native-handle: "+toHexString(drawable.getHandle()));
+              System.err.println("NS create drawable NSView-handle: "+toHexString(nsViewHandle));
+              System.err.println("NS create screen refresh-rate: "+sRefreshRate+" hz, "+screenVSyncTimeout+" micros");
+              // Thread.dumpStack();
           }
           if(fixedCaps.isPBuffer()) {
-              // Must now associate the pbuffer with our newly-created context
-              CGL.setContextPBuffer(ctx, drawable.getHandle());
+              if(!isPBuffer) {
+                  throw new InternalError("fixedCaps is PBuffer, handle not: "+drawable);
+              }
+          } else {
+              if(isPBuffer) {
+                  throw new InternalError("handle is PBuffer, fixedCaps not: "+drawable);
+              }                  
           }
-          //
-          // handled layered surface
-          //
+          config.setChosenCapabilities(fixedCaps);
+          /**
           if(null != backingLayerHost) {
-              nsOpenGLLayerPFmt = pixelFormat;
-              pixelFormat = 0;
-              final int texWidth, texHeight;
-              if(drawable instanceof MacOSXPbufferCGLDrawable) {
-                  final MacOSXPbufferCGLDrawable osxPDrawable = (MacOSXPbufferCGLDrawable)drawable;
-                  texWidth = osxPDrawable.getTextureWidth();
-                  texHeight = osxPDrawable.getTextureHeight();
-              } else {
-                  texWidth = drawable.getWidth();
-                  texHeight = drawable.getHeight();
+              backingLayerHost.setChosenCapabilities(fixedCaps);
+          }  */                  
+          
+          try {
+              int[] viewNotReady = new int[1];
+              // Try to allocate a context with this
+              ctx = CGL.createContext(share,
+                      nsViewHandle, allowIncompleteView,
+                      pixelFormat,
+                      chosenCaps.isBackgroundOpaque(),
+                      viewNotReady, 0);
+              if (0 == ctx) {
+                  if(DEBUG) {
+                      System.err.println("NS create failed: viewNotReady: "+ (1 == viewNotReady[0]));
+                  }
+                  return 0;
               }
-              if(0>=texWidth || 0>=texHeight || !drawable.isRealized()) {
-                  throw new GLException("Drawable not realized yet or invalid texture size, texSize "+texWidth+"x"+texHeight+", "+drawable);
+
+              if(null != backingLayerHost) {
+                  nsOpenGLLayerPFmt = pixelFormat;
+                  pixelFormat = 0;
               }
-              nsOpenGLLayer = CGL.createNSOpenGLLayer(ctx, nsOpenGLLayerPFmt, drawable.getHandle(), fixedCaps.isBackgroundOpaque(), texWidth, texHeight);
-              if (DEBUG) {
-                  System.err.println("NS create nsOpenGLLayer "+toHexString(nsOpenGLLayer)+", texSize "+texWidth+"x"+texHeight+", "+drawable);
+              
+              if (chosenCaps.isOnscreen() && !chosenCaps.isBackgroundOpaque()) {
+                  // Set the context opacity
+                  CGL.setContextOpacity(ctx, 0);
+              }
+          } finally {
+              if(0!=pixelFormat) {
+                  CGL.deletePixelFormat(pixelFormat);
+                  pixelFormat = 0;
               }
-              backingLayerHost.attachSurfaceLayer(nsOpenGLLayer);
-              setSwapInterval(1); // enabled per default in layered surface
-          }
-        } finally {
-          if(0!=pixelFormat) {
-              CGL.deletePixelFormat(pixelFormat);
-          }
-        }
-        return ctx;
-    }
-
-    @Override
-    public boolean destroy(long ctx) {
-      if(0 != nsOpenGLLayer) {
-          final NativeSurface surface = drawable.getNativeSurface();
-          if (DEBUG) {
-              System.err.println("NS destroy nsOpenGLLayer "+toHexString(nsOpenGLLayer));
-          }
-          final OffscreenLayerSurface ols = NativeWindowFactory.getOffscreenLayerSurface(surface, true);
-          if(null != ols && ols.isSurfaceLayerAttached()) {
-              // still having a valid OLS attached to surface (parent OLS could have been removed)
-              ols.detachSurfaceLayer();
           }
-          CGL.releaseNSOpenGLLayer(nsOpenGLLayer); 
-          CGL.deletePixelFormat(nsOpenGLLayerPFmt);
-          nsOpenGLLayerPFmt = 0;
-          nsOpenGLLayer = 0;
+          return ctx;
       }
-      return CGL.deleteContext(ctx, true);
-    }
-
-    @Override
-    public boolean copyImpl(long src, int mask) {
-        CGL.copyContext(contextHandle, src, mask);
-        return true;
-    }
 
-    @Override
-    public boolean makeCurrent(long ctx) {
-      final long cglCtx = CGL.getCGLContext(ctx);
-      if(0 == cglCtx) {
-          throw new InternalError("Null CGLContext for: "+this);
+      @Override
+      public boolean destroy(long ctx) {
+          lastPBufferHandle = 0;
+          return CGL.deleteContext(ctx, true);
       }
-      int err = CGL.CGLLockContext(cglCtx);
-      if(CGL.kCGLNoError == err) {
-          return CGL.makeCurrentContext(ctx);
-      } else if(DEBUG) {
-          System.err.println("NSGL: Could not lock context: err 0x"+Integer.toHexString(err)+": "+this);
+
+      @Override
+      public boolean contextRealized(boolean realized) {
+          if( realized ) {
+              if( null != backingLayerHost ) {
+                  //
+                  // handled layered surface
+                  //
+                  final GLCapabilitiesImmutable chosenCaps = drawable.getChosenGLCapabilities();
+                  final long ctx = MacOSXCGLContext.this.getHandle();
+                  final int texID;
+                  final long drawableHandle = drawable.getHandle();
+                  if(drawable instanceof GLFBODrawableImpl) {
+                      final GLFBODrawableImpl fbod = (GLFBODrawableImpl)drawable;
+                      texID = fbod.getTextureBuffer(GL.GL_FRONT).getName();                    
+                      fbod.setSwapBufferContext(new GLFBODrawableImpl.SwapBufferContext() {
+                          public void swapBuffers(boolean doubleBuffered) {
+                              MacOSXCGLContext.NSOpenGLImpl.this.swapBuffers();                            
+                          } } ) ;                    
+                      lastPBufferHandle = 0;
+                  } else if( chosenCaps.isPBuffer() && CGL.isNSOpenGLPixelBuffer(drawableHandle) ) {
+                      texID = 0;
+                      lastPBufferHandle = drawableHandle;
+                  } else {
+                      throw new GLException("BackingLayerHost w/ unknown handle (!FBO, !PBuffer): "+drawable);
+                  }
+                  lastWidth = drawable.getWidth();
+                  lastHeight = drawable.getHeight();
+                  if(0>=lastWidth || 0>=lastHeight || !drawable.isRealized()) {
+                      throw new GLException("Drawable not realized yet or invalid texture size, texSize "+lastWidth+"x"+lastHeight+", "+drawable);
+                  }
+                  nsOpenGLLayer = CGL.createNSOpenGLLayer(ctx, nsOpenGLLayerPFmt, lastPBufferHandle, texID, chosenCaps.isBackgroundOpaque(), lastWidth, lastHeight);
+                  if (DEBUG) {
+                      System.err.println("NS create nsOpenGLLayer "+toHexString(nsOpenGLLayer)+" w/ pbuffer "+toHexString(lastPBufferHandle)+", texID "+texID+", texSize "+lastWidth+"x"+lastHeight+", "+drawable);
+                  }
+                  backingLayerHost.attachSurfaceLayer(nsOpenGLLayer);
+                  setSwapInterval(1); // enabled per default in layered surface                
+              } else {
+                  lastWidth = drawable.getWidth();
+                  lastHeight = drawable.getHeight();                  
+              }
+          } else {
+              if( 0 != nsOpenGLLayer ) {
+                  final NativeSurface surface = drawable.getNativeSurface();
+                  if (DEBUG) {
+                      System.err.println("NS destroy nsOpenGLLayer "+toHexString(nsOpenGLLayer)+", "+drawable);
+                  }
+                  final OffscreenLayerSurface ols = NativeWindowFactory.getOffscreenLayerSurface(surface, true);
+                  if(null != ols && ols.isSurfaceLayerAttached()) {
+                      // still having a valid OLS attached to surface (parent OLS could have been removed)
+                      ols.detachSurfaceLayer();
+                  }
+                  CGL.releaseNSOpenGLLayer(nsOpenGLLayer); 
+                  nsOpenGLLayer = 0;
+              }
+              if(0 != nsOpenGLLayerPFmt) {
+                  CGL.deletePixelFormat(nsOpenGLLayerPFmt);
+                  nsOpenGLLayerPFmt = 0;
+              }
+              lastPBufferHandle = 0;
+          }
+          backingLayerHost = null;
+          return true;
       }
-      return false;
-    }
 
-    @Override
-    public boolean release(long ctx) {
-      try {
-          gl.glFlush(); // w/o glFlush()/glFinish() OSX < 10.7 (NVidia driver) may freeze
-      } catch (GLException gle) {
-          if(DEBUG) {
-            System.err.println("MacOSXCGLContext.NSOpenGLImpl.release: INFO: glFlush() catched exception:");
-            gle.printStackTrace();
+      private final void validatePBufferConfig(long ctx) {
+          final GLCapabilitiesImmutable chosenCaps = drawable.getChosenGLCapabilities();
+          final long drawableHandle = drawable.getHandle();
+          if(chosenCaps.isPBuffer() && CGL.isNSOpenGLPixelBuffer(drawableHandle) && lastPBufferHandle != drawableHandle) {
+              // Must associate the pbuffer with our newly-created context
+              lastPBufferHandle = drawableHandle;
+              if(0 != drawableHandle) {
+                  CGL.setContextPBuffer(ctx, drawableHandle);
+              }
+              if(DEBUG) {
+                  System.err.println("NS.validateDrawableConfig bind pbuffer "+toHexString(drawableHandle)+" -> ctx "+toHexString(ctx)); 
+              }
           }
       }
-      final boolean res = CGL.clearCurrentContext(ctx);
-      final long cglCtx = CGL.getCGLContext(ctx);
-      if(0 == cglCtx) {
-          throw new InternalError("Null CGLContext for: "+this);
+      
+      /** Returns true if size has been updated, otherwise false (same size). */
+      private final boolean validateDrawableSizeConfig(long ctx) {
+          final int width = drawable.getWidth();
+          final int height = drawable.getHeight();
+          if( lastWidth != width || lastHeight != height ) {
+              lastWidth = drawable.getWidth();
+              lastHeight = drawable.getHeight();
+              if(DEBUG) {
+                  System.err.println("NS.validateDrawableConfig size changed"); 
+              }
+              return true;
+          }
+          return false;
       }
-      final int err = CGL.CGLUnlockContext(cglCtx);
-      if(DEBUG && CGL.kCGLNoError != err) {
-          System.err.println("CGL: Could not unlock context: err 0x"+Integer.toHexString(err)+": "+this);
+      
+      @Override
+      public boolean copyImpl(long src, int mask) {
+          CGL.copyContext(contextHandle, src, mask);
+          return true;
       }
-      return res && CGL.kCGLNoError == err;
-    }
 
-    @Override
-    public boolean setSwapInterval(int interval) {
-      if(0 != nsOpenGLLayer) {
-        CGL.setNSOpenGLLayerSwapInterval(nsOpenGLLayer, interval);
-        vsyncTimeout = interval * (int)screenVSyncTimeout;
-        if(DEBUG) { System.err.println("NS setSwapInterval: "+vsyncTimeout+" micros"); }
+      @Override
+      public boolean makeCurrent(long ctx) {
+          final long cglCtx = CGL.getCGLContext(ctx);
+          if(0 == cglCtx) {
+              throw new InternalError("Null CGLContext for: "+this);
+          }
+          int err = CGL.CGLLockContext(cglCtx);
+          if(CGL.kCGLNoError == err) {
+              validatePBufferConfig(ctx); // required to handle pbuffer change ASAP
+              return CGL.makeCurrentContext(ctx);
+          } else if(DEBUG) {
+              System.err.println("NSGL: Could not lock context: err 0x"+Integer.toHexString(err)+": "+this);
+          }
+          return false;
+      }
+
+      @Override
+      public boolean release(long ctx) {
+          try {
+              gl.glFlush(); // w/o glFlush()/glFinish() OSX < 10.7 (NVidia driver) may freeze
+          } catch (GLException gle) {
+              if(DEBUG) {
+                  System.err.println("MacOSXCGLContext.NSOpenGLImpl.release: INFO: glFlush() catched exception:");
+                  gle.printStackTrace();
+              }
+          }
+          final boolean res = CGL.clearCurrentContext(ctx);
+          final long cglCtx = CGL.getCGLContext(ctx);
+          if(0 == cglCtx) {
+              throw new InternalError("Null CGLContext for: "+this);
+          }
+          final int err = CGL.CGLUnlockContext(cglCtx);
+          if(DEBUG && CGL.kCGLNoError != err) {
+              System.err.println("CGL: Could not unlock context: err 0x"+Integer.toHexString(err)+": "+this);
+          }
+          return res && CGL.kCGLNoError == err;
       }
-      CGL.setSwapInterval(contextHandle, interval);
-      return true;
-    }
 
-    @Override
-    public boolean swapBuffers() {
-      if( 0 != nsOpenGLLayer ) {
-        // If v-sync is disabled, frames will be drawn as quickly as possible
-        // w/o delay but in sync w/ CALayer. Otherwise wait until next swap interval (v-sync).
-        CGL.waitUntilNSOpenGLLayerIsReady(nsOpenGLLayer, vsyncTimeout);
+      @Override
+      public boolean detachPBuffer() {
+          if(0 != lastPBufferHandle) {
+              lastPBufferHandle = 0;
+              if(0 != nsOpenGLLayer) {
+                  CGL.flushNSOpenGLLayerPBuffer(nsOpenGLLayer); // notify invalid pbuffer
+              }
+              // CGL.setContextPBuffer(contextHandle, 0); // doesn't work, i.e. not taking nil
+          }
+          return true;
       }
-      if(CGL.flushBuffer(contextHandle)) {
+      
+      @Override
+      public boolean setSwapInterval(int interval) {
           if(0 != nsOpenGLLayer) {
-              // trigger CALayer to update
-              CGL.setNSOpenGLLayerNeedsDisplay(nsOpenGLLayer);
+              CGL.setNSOpenGLLayerSwapInterval(nsOpenGLLayer, interval);
+              vsyncTimeout = interval * (int)screenVSyncTimeout + 1000; // +1ms
+              if(DEBUG) { System.err.println("NS setSwapInterval: "+vsyncTimeout+" micros"); }
           }
+          CGL.setSwapInterval(contextHandle, interval);
           return true;
       }
-      return false;
-    }
+
+      private int skipSync=0;
+      
+      @Override
+      public boolean swapBuffers() {
+          final boolean res;
+          if( 0 != nsOpenGLLayer ) {
+              if( validateDrawableSizeConfig(contextHandle) ) {
+                  // skip wait-for-vsync for a few frames if size has changed,
+                  // allowing to update the texture IDs ASAP.
+                  skipSync = 10;
+              }
+              
+              final int texID;
+              final boolean valid;
+              if(drawable instanceof GLFBODrawableImpl) {
+                  texID = ((GLFBODrawableImpl)drawable).getTextureBuffer(GL.GL_FRONT).getName();
+                  valid = 0 != texID;
+              } else {
+                  texID = 0;
+                  valid = 0 != lastPBufferHandle;
+              }
+              if(valid) {
+                  if(0 == skipSync) {
+                      // If v-sync is disabled, frames will be drawn as quickly as possible
+                      // w/o delay but in sync w/ CALayer. Otherwise wait until next swap interval (v-sync).
+                      CGL.waitUntilNSOpenGLLayerIsReady(nsOpenGLLayer, vsyncTimeout);
+                  } else {
+                      skipSync--;
+                  }
+                  res = CGL.flushBuffer(contextHandle);
+                  if(res) {
+                      // trigger CALayer to update incl. possible surface change
+                      CGL.setNSOpenGLLayerNeedsDisplay(nsOpenGLLayer, lastPBufferHandle, texID, lastWidth, lastHeight);
+                  }
+              } else {
+                  res = true;
+              }
+          } else {
+              res = CGL.flushBuffer(contextHandle);
+          }
+          return res;
+      }
+
   }
 
   class CGLImpl implements GLBackendImpl {
-    @Override
-    public boolean isNSContext() { return false; }
-
-    @Override
-    public long create(long share, int ctp, int major, int minor) {
-      long ctx = 0;
-      MacOSXCGLGraphicsConfiguration config = (MacOSXCGLGraphicsConfiguration) drawable.getNativeSurface().getGraphicsConfiguration();
-      GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable)config.getChosenCapabilities();
-      long pixelFormat = MacOSXCGLGraphicsConfiguration.GLCapabilities2CGLPixelFormat(chosenCaps, ctp, major, minor);
-      if (pixelFormat == 0) {
-        throw new GLException("Unable to allocate pixel format with requested GLCapabilities");
-      }
-      config.setChosenPixelFormat(pixelFormat);
-      try {
-          // Create new context
-          PointerBuffer ctxPB = PointerBuffer.allocateDirect(1);
-          if (DEBUG) {
-            System.err.println("Share context for CGL-based pbuffer context is " + toHexString(share));
+      @Override
+      public boolean isNSContext() { return false; }
+
+      @Override
+      public long create(long share, int ctp, int major, int minor) {
+          long ctx = 0;
+          MacOSXCGLGraphicsConfiguration config = (MacOSXCGLGraphicsConfiguration) drawable.getNativeSurface().getGraphicsConfiguration();
+          GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable)config.getChosenCapabilities();
+          long pixelFormat = MacOSXCGLGraphicsConfiguration.GLCapabilities2CGLPixelFormat(chosenCaps, ctp, major, minor);
+          if (pixelFormat == 0) {
+              throw new GLException("Unable to allocate pixel format with requested GLCapabilities");
           }
-          int res = CGL.CGLCreateContext(pixelFormat, share, ctxPB);
-          if (res != CGL.kCGLNoError) {
-            throw new GLException("Error code " + res + " while creating context");
-          }
-          if(chosenCaps.isPBuffer()) {
-              // Attach newly-created context to the pbuffer
-              res = CGL.CGLSetPBuffer(ctxPB.get(0), drawable.getHandle(), 0, 0, 0);
+          try {
+              // Create new context
+              PointerBuffer ctxPB = PointerBuffer.allocateDirect(1);
+              if (DEBUG) {
+                  System.err.println("Share context for CGL-based pbuffer context is " + toHexString(share));
+              }
+              int res = CGL.CGLCreateContext(pixelFormat, share, ctxPB);
               if (res != CGL.kCGLNoError) {
-                throw new GLException("Error code " + res + " while attaching context to pbuffer");
+                  throw new GLException("Error code " + res + " while creating context");
               }
-          }
-          ctx = ctxPB.get(0);
-          if(0!=ctx) {
-              if(DEBUG) {
-                  GLCapabilitiesImmutable caps0 = MacOSXCGLGraphicsConfiguration.CGLPixelFormat2GLCapabilities(pixelFormat);
-                  System.err.println("NS created: "+caps0);
+              ctx = ctxPB.get(0);
+
+              if (0 != ctx) {
+                  GLCapabilities fixedCaps = MacOSXCGLGraphicsConfiguration.CGLPixelFormat2GLCapabilities(pixelFormat);
+                  fixedCaps = GLGraphicsConfigurationUtil.fixOpaqueGLCapabilities(fixedCaps, chosenCaps.isBackgroundOpaque());
+                  if(chosenCaps.isOnscreen() || !fixedCaps.isPBuffer()) {
+                      // not handled, so copy them
+                      fixedCaps.setFBO(chosenCaps.isFBO());
+                      fixedCaps.setPBuffer(chosenCaps.isPBuffer());
+                      fixedCaps.setBitmap(chosenCaps.isBitmap());
+                      fixedCaps.setOnscreen(chosenCaps.isOnscreen());
+                  }              
+                  config.setChosenCapabilities(fixedCaps);
+                  if(DEBUG) {
+                      System.err.println("CGL create fixedCaps: "+fixedCaps);
+                  }
+                  if(fixedCaps.isPBuffer()) {
+                      // Must now associate the pbuffer with our newly-created context
+                      res = CGL.CGLSetPBuffer(ctx, drawable.getHandle(), 0, 0, 0);
+                      if (res != CGL.kCGLNoError) {
+                          throw new GLException("Error code " + res + " while attaching context to pbuffer");
+                      }
+                  }              
               }
+          } finally {
+              CGL.CGLDestroyPixelFormat(pixelFormat);
           }
-      } finally {
-          CGL.CGLDestroyPixelFormat(pixelFormat);
+          return ctx;
       }
-      return ctx;
-    }
 
-    @Override
-    public boolean destroy(long ctx) {
-      return CGL.CGLDestroyContext(ctx) == CGL.kCGLNoError;
-    }
+      @Override
+      public boolean destroy(long ctx) {
+          return CGL.CGLDestroyContext(ctx) == CGL.kCGLNoError;
+      }
 
-    @Override
-    public boolean copyImpl(long src, int mask) {
-        CGL.CGLCopyContext(src, contextHandle, mask);
-        return true;
-    }
+      @Override
+      public boolean contextRealized(boolean realized) {
+          return true;
+      }
+
+      @Override
+      public boolean copyImpl(long src, int mask) {
+          CGL.CGLCopyContext(src, contextHandle, mask);
+          return true;
+      }
 
-    @Override
-    public boolean makeCurrent(long ctx) {
-      int err = CGL.CGLLockContext(ctx);
-      if(CGL.kCGLNoError == err) {
-          err = CGL.CGLSetCurrentContext(ctx);
+      @Override
+      public boolean makeCurrent(long ctx) {
+          int err = CGL.CGLLockContext(ctx);
           if(CGL.kCGLNoError == err) {
-              return true;
+              err = CGL.CGLSetCurrentContext(ctx);
+              if(CGL.kCGLNoError == err) {
+                  return true;
+              } else if(DEBUG) {
+                  System.err.println("CGL: Could not make context current: err 0x"+Integer.toHexString(err)+": "+this);
+              }
           } else if(DEBUG) {
-              System.err.println("CGL: Could not make context current: err 0x"+Integer.toHexString(err)+": "+this);
+              System.err.println("CGL: Could not lock context: err 0x"+Integer.toHexString(err)+": "+this);
           }
-      } else if(DEBUG) {
-          System.err.println("CGL: Could not lock context: err 0x"+Integer.toHexString(err)+": "+this);
+          return false;
       }
-      return false;
-    }
 
-    @Override
-    public boolean release(long ctx) {
-      try {
-          gl.glFlush(); // w/o glFlush()/glFinish() OSX < 10.7 (NVidia driver) may freeze
-      } catch (GLException gle) {
-          if(DEBUG) {
-            System.err.println("MacOSXCGLContext.CGLImpl.release: INFO: glFlush() catched exception:");
-            gle.printStackTrace();
+      @Override
+      public boolean release(long ctx) {
+          try {
+              gl.glFlush(); // w/o glFlush()/glFinish() OSX < 10.7 (NVidia driver) may freeze
+          } catch (GLException gle) {
+              if(DEBUG) {
+                  System.err.println("MacOSXCGLContext.CGLImpl.release: INFO: glFlush() catched exception:");
+                  gle.printStackTrace();
+              }
           }
+          int err = CGL.CGLSetCurrentContext(0);
+          if(DEBUG && CGL.kCGLNoError != err) {
+              System.err.println("CGL: Could not release current context: err 0x"+Integer.toHexString(err)+": "+this);
+          }
+          int err2 = CGL.CGLUnlockContext(ctx);
+          if(DEBUG && CGL.kCGLNoError != err2) {
+              System.err.println("CGL: Could not unlock context: err 0x"+Integer.toHexString(err2)+": "+this);
+          }
+          return CGL.kCGLNoError == err && CGL.kCGLNoError == err2;
+      }
+
+      @Override
+      public boolean detachPBuffer() {
+          /* Doesn't work, i.e. not taking NULL
+          final int res = CGL.CGLSetPBuffer(contextHandle, 0, 0, 0, 0);
+          if (res != CGL.kCGLNoError) {
+              throw new GLException("Error code " + res + " while detaching context from pbuffer");
+          } */
+          return true;
       }
-      int err = CGL.CGLSetCurrentContext(0);
-      if(DEBUG && CGL.kCGLNoError != err) {
-          System.err.println("CGL: Could not release current context: err 0x"+Integer.toHexString(err)+": "+this);
+      
+      @Override
+      public boolean setSwapInterval(int interval) {
+          int[] lval = new int[] { interval } ;
+          CGL.CGLSetParameter(contextHandle, CGL.kCGLCPSwapInterval, lval, 0);
+          return true;
       }
-      int err2 = CGL.CGLUnlockContext(ctx);
-      if(DEBUG && CGL.kCGLNoError != err2) {
-          System.err.println("CGL: Could not unlock context: err 0x"+Integer.toHexString(err2)+": "+this);
+      @Override
+      public boolean swapBuffers() {
+          return CGL.kCGLNoError == CGL.CGLFlushDrawable(contextHandle);
       }
-      return CGL.kCGLNoError == err && CGL.kCGLNoError == err2;
-    }
-
-    @Override
-    public boolean setSwapInterval(int interval) {
-        int[] lval = new int[] { interval } ;
-        CGL.CGLSetParameter(contextHandle, CGL.kCGLCPSwapInterval, lval, 0);
-        return true;
-    }
-    @Override
-    public boolean swapBuffers() {
-        return CGL.kCGLNoError == CGL.CGLFlushDrawable(contextHandle);
-    }
   }
 }
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawable.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawable.java
index af767f0c3..cc727c8e1 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawable.java
@@ -42,10 +42,10 @@ package jogamp.opengl.macosx.cgl;
 
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
-import java.util.Iterator;
 import java.util.List;
 
 import javax.media.nativewindow.NativeSurface;
+import javax.media.opengl.GLContext;
 import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 
@@ -92,7 +92,7 @@ public abstract class MacOSXCGLDrawable extends GLDrawableImpl {
         this.id = id;
     }
   }
-  private List<WeakReference<MacOSXCGLContext>> createdContexts = new ArrayList<WeakReference<MacOSXCGLContext>>();
+  /* pp */ List<WeakReference<MacOSXCGLContext>> createdContexts = new ArrayList<WeakReference<MacOSXCGLContext>>();
 
   private boolean haveSetOpenGLMode = false;
   private GLBackendType openGLMode = GLBackendType.NSOPENGL;
@@ -110,26 +110,42 @@ public abstract class MacOSXCGLDrawable extends GLDrawableImpl {
       return GLBackendType.NSOPENGL == openGLMode ? getHandle() : 0;
   }
 
-  protected void registerContext(MacOSXCGLContext ctx) {
+  @Override
+  protected void associateContext(GLContext ctx, boolean bound) {
     // NOTE: we need to keep track of the created contexts in order to
     // implement swapBuffers() because of how Mac OS X implements its
     // OpenGL window interface
     synchronized (createdContexts) {
-      createdContexts.add(new WeakReference<MacOSXCGLContext>(ctx));
-    }
+        if(bound) {
+            createdContexts.add(new WeakReference<MacOSXCGLContext>((MacOSXCGLContext)ctx));
+        } else {
+            for(int i=0; i<createdContexts.size(); ) {
+                final WeakReference<MacOSXCGLContext> ref = createdContexts.get(i); 
+                final MacOSXCGLContext _ctx = ref.get();
+                if( _ctx == null || _ctx == ctx) {
+                    createdContexts.remove(i);
+                } else {
+                    i++;
+                }
+            }            
+        }
+    }      
   }
+  
   @Override
-  protected final void swapBuffersImpl() {
-    // single-buffer is already filtered out @ GLDrawableImpl#swapBuffers()
-    synchronized (createdContexts) {
-        for (Iterator<WeakReference<MacOSXCGLContext>> iter = createdContexts.iterator(); iter.hasNext(); ) {
-          WeakReference<MacOSXCGLContext> ref = iter.next();
-          MacOSXCGLContext ctx = ref.get();
-          if (ctx != null) {
-            ctx.swapBuffers();
-          } else {
-            iter.remove();
-          }
+  protected final void swapBuffersImpl(boolean doubleBuffered) {
+    if(doubleBuffered) { 
+        synchronized (createdContexts) {
+            for(int i=0; i<createdContexts.size(); ) {
+                final WeakReference<MacOSXCGLContext> ref = createdContexts.get(i); 
+                final MacOSXCGLContext ctx = ref.get();
+                if (ctx != null) {
+                    ctx.swapBuffers();
+                    i++;
+                } else {
+                    createdContexts.remove(i);
+                }
+            }
         }
     }
   }
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
index 591fafc68..e174d38f4 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
@@ -51,7 +51,7 @@ import javax.media.nativewindow.AbstractGraphicsScreen;
 import javax.media.nativewindow.DefaultGraphicsScreen;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.ProxySurface;
-import javax.media.nativewindow.ProxySurface.UpstreamSurfaceHook;
+import javax.media.nativewindow.UpstreamSurfaceHook;
 import javax.media.opengl.GL;
 import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLCapabilitiesChooser;
@@ -61,7 +61,8 @@ import javax.media.opengl.GLDrawable;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
-import jogamp.nativewindow.macosx.OSXUtil;
+import jogamp.nativewindow.WrappedSurface;
+import jogamp.nativewindow.macosx.OSXDummyUpstreamSurfaceHook;
 import jogamp.opengl.DesktopGLDynamicLookupHelper;
 import jogamp.opengl.GLContextImpl;
 import jogamp.opengl.GLDrawableFactoryImpl;
@@ -71,7 +72,7 @@ import jogamp.opengl.GLGraphicsConfigurationUtil;
 
 import com.jogamp.common.JogampRuntimeException;
 import com.jogamp.common.util.ReflectionUtil;
-import com.jogamp.nativewindow.WrappedSurface;
+import com.jogamp.nativewindow.MutableGraphicsConfiguration;
 import com.jogamp.nativewindow.macosx.MacOSXGraphicsDevice;
 import com.jogamp.opengl.GLExtensions;
 
@@ -320,9 +321,14 @@ public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
 
   @Override
   protected GLDrawableImpl createOffscreenDrawableImpl(NativeSurface target) {
-    AbstractGraphicsConfiguration config = target.getGraphicsConfiguration();
-    GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) config.getChosenCapabilities();
+    final MutableGraphicsConfiguration config = (MutableGraphicsConfiguration) target.getGraphicsConfiguration();
+    final GLCapabilitiesImmutable caps = (GLCapabilitiesImmutable) config.getChosenCapabilities();
     if(!caps.isPBuffer()) {
+        // Actual implementation is using PBuffer ...
+        final GLCapabilities modCaps = (GLCapabilities) caps.cloneMutable();
+        modCaps.setPBuffer(true);
+        modCaps.setBitmap(false);
+        config.setChosenCapabilities(modCaps);
         return new MacOSXOffscreenCGLDrawable(this, target);
     }
     return new MacOSXPbufferCGLDrawable(this, target);
@@ -336,7 +342,7 @@ public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
   @Override
   protected ProxySurface createMutableSurfaceImpl(AbstractGraphicsDevice deviceReq, boolean createNewDevice, 
                                                   GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested, 
-                                                  GLCapabilitiesChooser chooser, int width, int height, UpstreamSurfaceHook lifecycleHook) {
+                                                  GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstreamHook) {
     final MacOSXGraphicsDevice device;
     if(createNewDevice) {
         device = new MacOSXGraphicsDevice(deviceReq.getUnitID());
@@ -348,68 +354,23 @@ public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
     if(null == config) {
         throw new GLException("Choosing GraphicsConfiguration failed w/ "+capsChosen+" on "+screen); 
     }    
-    return new WrappedSurface(config, 0, width, height, lifecycleHook);
+    return new WrappedSurface(config, 0, upstreamHook, createNewDevice);
   }
 
   @Override
   public final ProxySurface createDummySurfaceImpl(AbstractGraphicsDevice deviceReq, boolean createNewDevice, 
                                                    GLCapabilitiesImmutable requestedCaps, GLCapabilitiesChooser chooser, int width, int height) {
     final GLCapabilitiesImmutable chosenCaps = GLGraphicsConfigurationUtil.fixOnscreenGLCapabilities(requestedCaps);
-    return createMutableSurfaceImpl(deviceReq, createNewDevice, chosenCaps, requestedCaps, chooser, width, height, dummySurfaceLifecycleHook); 
+    return createMutableSurfaceImpl(deviceReq, createNewDevice, chosenCaps, requestedCaps, chooser, 
+                                    new OSXDummyUpstreamSurfaceHook(width, height)); 
   }  
-  private static final ProxySurface.UpstreamSurfaceHook dummySurfaceLifecycleHook = new ProxySurface.UpstreamSurfaceHook() {
-    long nsWindow = 0;
-    @Override
-    public final void create(ProxySurface s) {
-        if(0 == nsWindow && 0 == s.getSurfaceHandle()) {
-            nsWindow = OSXUtil.CreateNSWindow(0, 0, s.getWidth(), s.getHeight());
-            if(0 == nsWindow) {
-                throw new GLException("Error NS window 0");
-            }
-            long nsView = OSXUtil.GetNSView(nsWindow);
-            if(0 == nsView) {
-                throw new GLException("Error NS view 0");
-            }
-            s.setSurfaceHandle(nsView);
-            s.setImplBitfield(ProxySurface.INVISIBLE_WINDOW);
-            if(DEBUG) {
-                System.err.println("MacOSXCGLDrawableFactory.dummySurfaceLifecycleHook.create: "+s);
-            }
-        }
-    }
-    @Override
-    public final void destroy(ProxySurface s) {
-        if(0 != nsWindow && 0 != s.getSurfaceHandle()) {
-            OSXUtil.DestroyNSWindow(nsWindow);
-            nsWindow = 0;
-            s.setSurfaceHandle(0);
-            if(DEBUG) {
-                System.err.println("MacOSXCGLDrawableFactory.dummySurfaceLifecycleHook.destroy: "+s);
-            }
-        }
-    }
-    @Override
-    public final int getWidth(ProxySurface s) {
-        return s.initialWidth;
-    }
-    @Override
-    public final int getHeight(ProxySurface s) {
-        return s.initialHeight;
-    }
-    
-    @Override
-    public String toString() {
-       return "MacOSXLSurfaceLifecycleHook[]";
-    }
-    
-  };
   
   @Override
   protected ProxySurface createProxySurfaceImpl(AbstractGraphicsDevice deviceReq, int screenIdx, long windowHandle, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstream) {
     final MacOSXGraphicsDevice device = new MacOSXGraphicsDevice(deviceReq.getUnitID());
     final AbstractGraphicsScreen screen = new DefaultGraphicsScreen(device, screenIdx);
     final MacOSXCGLGraphicsConfiguration config = MacOSXCGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsRequested, capsRequested, chooser, screen, true); 
-    return new WrappedSurface(config, windowHandle, 0, 0, upstream);
+    return new WrappedSurface(config, windowHandle, upstream, true);
   }
 
   @Override
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLGraphicsConfiguration.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLGraphicsConfiguration.java
index 149927160..8866c7ce6 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLGraphicsConfiguration.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLGraphicsConfiguration.java
@@ -51,23 +51,16 @@ import com.jogamp.common.nio.PointerBuffer;
 import com.jogamp.nativewindow.MutableGraphicsConfiguration;
 
 public class MacOSXCGLGraphicsConfiguration extends MutableGraphicsConfiguration implements Cloneable {
-    long pixelformat;
 
     MacOSXCGLGraphicsConfiguration(AbstractGraphicsScreen screen, 
-                                   GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested,
-                                   long pixelformat) {
+                                   GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested) {
         super(screen, capsChosen, capsRequested);
-        this.pixelformat=pixelformat;
     }
 
     public Object clone() {
         return super.clone();
     }
 
-    void setChosenPixelFormat(long pixelformat) {
-        this.pixelformat=pixelformat;
-    }
-
     protected static List<GLCapabilitiesImmutable> getAvailableCapabilities(MacOSXCGLDrawableFactory factory, AbstractGraphicsDevice device) {
         MacOSXCGLDrawableFactory.SharedResource sharedResource = factory.getOrCreateOSXSharedResource(device);
         if(null == sharedResource) {
@@ -114,11 +107,11 @@ public class MacOSXCGLGraphicsConfiguration extends MutableGraphicsConfiguration
                 break;
                   
               case CGL.kCGLPFAColorFloat:
-                ivalues[idx] = caps.getPbufferFloatingPointBuffers() ? 1 : 0;
+                ivalues[idx] = ( !caps.isOnscreen() && caps.isPBuffer() && caps.getPbufferFloatingPointBuffers() ) ? 1 : 0;
                 break;
 
               case CGL.NSOpenGLPFAPixelBuffer:
-                ivalues[idx] = caps.isPBuffer() ? 1 : 0;
+                ivalues[idx] = ( !caps.isOnscreen() && caps.isPBuffer() ) ? 1 : 0;
                 break;
 
               case CGL.NSOpenGLPFADoubleBuffer:
@@ -188,11 +181,11 @@ public class MacOSXCGLGraphicsConfiguration extends MutableGraphicsConfiguration
           attrs[i++] = CGL.kCGLPFAOpenGLProfile; 
           attrs[i++] = MacOSXCGLContext.GLProfile2CGLOGLProfileValue(ctp, major, minor);
       }
-      if(caps.isPBuffer()) {
+      if(!caps.isOnscreen() && caps.isPBuffer()) {
         attrs[i++] = CGL.kCGLPFAPBuffer;
-      }
-      if (caps.getPbufferFloatingPointBuffers()) {
-        attrs[i++] = CGL.kCGLPFAColorFloat;
+        if (caps.getPbufferFloatingPointBuffers()) {
+          attrs[i++] = CGL.kCGLPFAColorFloat;
+        }
       }
       if (caps.getDoubleBuffered()) {
         attrs[i++] = CGL.kCGLPFADoubleBuffer;
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLGraphicsConfigurationFactory.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLGraphicsConfigurationFactory.java
index 13faf7090..43a9d0d1a 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLGraphicsConfigurationFactory.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLGraphicsConfigurationFactory.java
@@ -96,6 +96,6 @@ public class MacOSXCGLGraphicsConfigurationFactory extends GLGraphicsConfigurati
 
         capsChosen = GLGraphicsConfigurationUtil.fixGLCapabilities( capsChosen, GLContext.isFBOAvailable(device, capsChosen.getGLProfile()), factory.canCreateGLPbuffer(device) );
         
-        return new MacOSXCGLGraphicsConfiguration(absScreen, (GLCapabilitiesImmutable)capsChosen, (GLCapabilitiesImmutable)capsRequested, 0);
+        return new MacOSXCGLGraphicsConfiguration(absScreen, (GLCapabilitiesImmutable)capsChosen, (GLCapabilitiesImmutable)capsRequested);
     }
 }
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXExternalCGLContext.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXExternalCGLContext.java
index 6be9e386d..65ed5fc15 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXExternalCGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXExternalCGLContext.java
@@ -49,8 +49,8 @@ import javax.media.opengl.GLContext;
 import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 
-import com.jogamp.nativewindow.WrappedSurface;
 
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.opengl.GLContextImpl;
 import jogamp.opengl.GLContextShareSet;
 import jogamp.opengl.macosx.cgl.MacOSXCGLDrawable.GLBackendType;
@@ -62,7 +62,6 @@ public class MacOSXExternalCGLContext extends MacOSXCGLContext {
   private MacOSXExternalCGLContext(Drawable drawable, boolean isNSContext, long handle) {
     super(drawable, null);
     setOpenGLMode(isNSContext ? GLBackendType.NSOPENGL : GLBackendType.CGL );
-    drawable.registerContext(this);
     this.contextHandle = handle;
     GLContextShareSet.contextCreated(this);
     setGLFunctionAvailability(false, 0, 0, CTX_PROFILE_COMPAT);
@@ -108,13 +107,13 @@ public class MacOSXExternalCGLContext extends MacOSXCGLContext {
     }
 
     AbstractGraphicsScreen aScreen = DefaultGraphicsScreen.createDefault(NativeWindowFactory.TYPE_MACOSX);
-    MacOSXCGLGraphicsConfiguration cfg = new MacOSXCGLGraphicsConfiguration(aScreen, caps, caps, pixelFormat);
+    MacOSXCGLGraphicsConfiguration cfg = new MacOSXCGLGraphicsConfiguration(aScreen, caps, caps);
 
     if(0 == currentDrawable) {
         // set a fake marker stating a valid drawable
         currentDrawable = 1;
     }
-    WrappedSurface ns = new WrappedSurface(cfg, currentDrawable, 64, 64, null);
+    WrappedSurface ns = new WrappedSurface(cfg, currentDrawable, 64, 64, true);
     return new MacOSXExternalCGLContext(new Drawable(factory, ns), isNSContext, contextHandle);
   }
 
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXOnscreenCGLDrawable.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXOnscreenCGLDrawable.java
index b1e283ebc..ec9628004 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXOnscreenCGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXOnscreenCGLDrawable.java
@@ -52,9 +52,7 @@ public class MacOSXOnscreenCGLDrawable extends MacOSXCGLDrawable {
 
   @Override
   public GLContext createContext(GLContext shareWith) {
-    final MacOSXOnscreenCGLContext ctx= new MacOSXOnscreenCGLContext(this, shareWith);
-    registerContext(ctx);
-    return ctx;
+    return new MacOSXOnscreenCGLContext(this, shareWith);
   }
 
 }
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXPbufferCGLContext.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXPbufferCGLContext.java
index 88886ddd2..7e2d8cf10 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXPbufferCGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXPbufferCGLContext.java
@@ -39,6 +39,7 @@ import javax.media.opengl.GLPbuffer;
 
 import jogamp.opengl.GLContextImpl;
 
+@SuppressWarnings("deprecation")
 public class MacOSXPbufferCGLContext extends MacOSXCGLContext {
 
   // State for render-to-texture and render-to-texture-rectangle support
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXPbufferCGLDrawable.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXPbufferCGLDrawable.java
index 8f2f386af..668e463a2 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXPbufferCGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXPbufferCGLDrawable.java
@@ -40,6 +40,8 @@
 
 package jogamp.opengl.macosx.cgl;
 
+import java.lang.ref.WeakReference;
+
 import javax.media.nativewindow.DefaultGraphicsConfiguration;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.MutableSurface;
@@ -70,9 +72,6 @@ public class MacOSXPbufferCGLDrawable extends MacOSXCGLDrawable {
   // private int textureTarget; // e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE_NV
   // private int texture;       // actual texture object
 
-  // Note that we can not store this in the NativeSurface because the
-  // semantic is that contains an NSView
-  protected long pBuffer;
   protected int pBufferTexTarget, pBufferTexWidth, pBufferTexHeight;
 
   public MacOSXPbufferCGLDrawable(GLDrawableFactory factory, NativeSurface target) {
@@ -90,9 +89,7 @@ public class MacOSXPbufferCGLDrawable extends MacOSXCGLDrawable {
 
   @Override
   public GLContext createContext(GLContext shareWith) {
-    final MacOSXPbufferCGLContext ctx = new MacOSXPbufferCGLContext(this, shareWith);
-    registerContext(ctx);
-    return ctx;
+    return new MacOSXPbufferCGLContext(this, shareWith);
   }
   
   @Override
@@ -101,27 +98,34 @@ public class MacOSXPbufferCGLDrawable extends MacOSXCGLDrawable {
     return 0;
   }
 
-  @Override
-  public long getHandle() {
-    return pBuffer;
-  }
-
   protected int getTextureTarget() { return pBufferTexTarget;  }
   protected int getTextureWidth() { return pBufferTexWidth; }
   protected int getTextureHeight() { return pBufferTexHeight; }
 
   protected void destroyPbuffer() {
-    if (this.pBuffer != 0) {
-      NativeSurface ns = getNativeSurface();
+    final MutableSurface ms = (MutableSurface) getNativeSurface();
+    final long pBuffer = ms.getSurfaceHandle();
+    if (0 != pBuffer) {
+      synchronized (createdContexts) {
+        for(int i=0; i<createdContexts.size(); ) {
+          final WeakReference<MacOSXCGLContext> ref = createdContexts.get(i); 
+          final MacOSXCGLContext ctx = ref.get();
+          if (ctx != null) {
+            ctx.detachPBuffer();
+            i++;
+          } else {
+            createdContexts.remove(i);
+          }
+        }
+      }
       impl.destroy(pBuffer);
-      this.pBuffer = 0;
-      ((MutableSurface)ns).setSurfaceHandle(0);
+      ms.setSurfaceHandle(0);
     }
   }
 
   private void createPbuffer() {
-    final NativeSurface ns = getNativeSurface();
-    final DefaultGraphicsConfiguration config = (DefaultGraphicsConfiguration) ns.getGraphicsConfiguration();
+    final MutableSurface ms = (MutableSurface) getNativeSurface();
+    final DefaultGraphicsConfiguration config = (DefaultGraphicsConfiguration) ms.getGraphicsConfiguration();
     final GLCapabilitiesImmutable capabilities = (GLCapabilitiesImmutable)config.getChosenCapabilities();
     final GLProfile glProfile = capabilities.getGLProfile();
     MacOSXCGLDrawableFactory.SharedResource sr = ((MacOSXCGLDrawableFactory)factory).getOrCreateOSXSharedResource(config.getScreen().getDevice());
@@ -161,7 +165,7 @@ public class MacOSXPbufferCGLDrawable extends MacOSXCGLDrawable {
       }
     }
 
-    pBuffer = impl.create(pBufferTexTarget, internalFormat, getWidth(), getHeight());
+    final long pBuffer = impl.create(pBufferTexTarget, internalFormat, getWidth(), getHeight());
     if(DEBUG) {
         System.err.println("MacOSXPbufferCGLDrawable tex: target "+toHexString(pBufferTexTarget)+
                             ", pbufferSize "+getWidth()+"x"+getHeight()+
@@ -174,7 +178,7 @@ public class MacOSXPbufferCGLDrawable extends MacOSXCGLDrawable {
       throw new GLException("pbuffer creation error: CGL.createPBuffer() failed");
     }
 
-    ((MutableSurface)ns).setSurfaceHandle(pBuffer);
+    ms.setSurfaceHandle(pBuffer);
   }
 
   @Override
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLContext.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLContext.java
index 96c1187d3..f6cc2956d 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLContext.java
@@ -50,8 +50,8 @@ import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
-import com.jogamp.nativewindow.WrappedSurface;
 
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.nativewindow.windows.GDI;
 import jogamp.opengl.GLContextShareSet;
 
@@ -102,7 +102,7 @@ public class WindowsExternalWGLContext extends WindowsWGLContext {
             System.err.println("WindowsExternalWGLContext valid hdc/pfd, retrieved cfg: " + cfg);
         }
     }
-    return new WindowsExternalWGLContext(new Drawable(factory, new WrappedSurface(cfg, hdc, 64, 64, null)), ctx, cfg);
+    return new WindowsExternalWGLContext(new Drawable(factory, new WrappedSurface(cfg, hdc, 64, 64, true)), ctx, cfg);
   }
 
   @Override
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLDrawable.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLDrawable.java
index 15bd005dc..f8c237c9e 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsExternalWGLDrawable.java
@@ -49,10 +49,10 @@ import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.nativewindow.windows.GDI;
 import jogamp.nativewindow.windows.GDIUtil;
 
-import com.jogamp.nativewindow.WrappedSurface;
 
 public class WindowsExternalWGLDrawable extends WindowsWGLDrawable {
 
@@ -72,7 +72,7 @@ public class WindowsExternalWGLDrawable extends WindowsWGLDrawable {
 
     final AbstractGraphicsScreen aScreen = DefaultGraphicsScreen.createDefault(NativeWindowFactory.TYPE_WINDOWS);
     final WindowsWGLGraphicsConfiguration cfg = WindowsWGLGraphicsConfiguration.createFromExternal(factory, hdc, pfdID, glp, aScreen, true);
-    return new WindowsExternalWGLDrawable(factory, new WrappedSurface(cfg, hdc, 64, 64, null));
+    return new WindowsExternalWGLDrawable(factory, new WrappedSurface(cfg, hdc, 64, 64, true));
   }
 
 
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawable.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawable.java
index ca7886e7f..3b3f0c123 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawable.java
@@ -73,27 +73,28 @@ public abstract class WindowsWGLDrawable extends GLDrawableImpl {
   }
 
   @Override
-  protected final void swapBuffersImpl() {
-    // single-buffer is already filtered out @ GLDrawableImpl#swapBuffers()
-    final long t0;
-    if (PROFILING) {
-      t0 = System.currentTimeMillis();
-    } else {
-      t0 = 0;
-    }
-
-    if (!WGLUtil.SwapBuffers(getHandle()) && (GDI.GetLastError() != GDI.ERROR_SUCCESS)) {
-      throw new GLException("Error swapping buffers");
-    }
-
-    if (PROFILING) {
-      profilingSwapBuffersTime += System.currentTimeMillis() - t0;
-      if (++profilingSwapBuffersTicks == PROFILING_TICKS) {
-        System.err.println("SwapBuffers calls: " + profilingSwapBuffersTime + " ms / " + PROFILING_TICKS + "  calls (" +
-                           ((float) profilingSwapBuffersTime / (float) PROFILING_TICKS) + " ms/call)");
-        profilingSwapBuffersTime = 0;
-        profilingSwapBuffersTicks = 0;
-      }
+  protected final void swapBuffersImpl(boolean doubleBuffered) {
+    if(doubleBuffered) {
+        final long t0;
+        if (PROFILING) {
+          t0 = System.currentTimeMillis();
+        } else {
+          t0 = 0;
+        }
+    
+        if (!WGLUtil.SwapBuffers(getHandle()) && (GDI.GetLastError() != GDI.ERROR_SUCCESS)) {
+          throw new GLException("Error swapping buffers");
+        }
+    
+        if (PROFILING) {
+          profilingSwapBuffersTime += System.currentTimeMillis() - t0;
+          if (++profilingSwapBuffersTicks == PROFILING_TICKS) {
+            System.err.println("SwapBuffers calls: " + profilingSwapBuffersTime + " ms / " + PROFILING_TICKS + "  calls (" +
+                               ((float) profilingSwapBuffersTime / (float) PROFILING_TICKS) + " ms/call)");
+            profilingSwapBuffersTime = 0;
+            profilingSwapBuffersTicks = 0;
+          }
+        }
     }
   }
 
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
index 7ea487523..91d5c225a 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
@@ -52,7 +52,7 @@ import javax.media.nativewindow.AbstractGraphicsScreen;
 import javax.media.nativewindow.DefaultGraphicsScreen;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.ProxySurface;
-import javax.media.nativewindow.ProxySurface.UpstreamSurfaceHook;
+import javax.media.nativewindow.UpstreamSurfaceHook;
 import javax.media.opengl.GL;
 import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLCapabilitiesChooser;
@@ -62,9 +62,10 @@ import javax.media.opengl.GLDrawable;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.nativewindow.windows.GDI;
+import jogamp.nativewindow.windows.GDIDummyUpstreamSurfaceHook;
 import jogamp.nativewindow.windows.GDISurface;
-import jogamp.nativewindow.windows.GDIUtil;
 import jogamp.nativewindow.windows.RegisteredClassFactory;
 import jogamp.opengl.DesktopGLDynamicLookupHelper;
 import jogamp.opengl.GLContextImpl;
@@ -79,7 +80,6 @@ import com.jogamp.common.nio.PointerBuffer;
 import com.jogamp.common.os.Platform;
 import com.jogamp.common.util.ReflectionUtil;
 import com.jogamp.common.util.VersionNumber;
-import com.jogamp.nativewindow.WrappedSurface;
 import com.jogamp.nativewindow.windows.WindowsGraphicsDevice;
 import com.jogamp.opengl.GLExtensions;
 
@@ -541,7 +541,7 @@ public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
   @Override
   protected final ProxySurface createMutableSurfaceImpl(AbstractGraphicsDevice deviceReq, boolean createNewDevice, 
                                                         GLCapabilitiesImmutable capsChosen, GLCapabilitiesImmutable capsRequested, 
-                                                        GLCapabilitiesChooser chooser, int width, int height, UpstreamSurfaceHook lifecycleHook) {
+                                                        GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstreamHook) {
     final WindowsGraphicsDevice device;
     if(createNewDevice) {
         device = new WindowsGraphicsDevice(deviceReq.getConnection(), deviceReq.getUnitID());
@@ -553,7 +553,7 @@ public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
     if(null == config) {
         throw new GLException("Choosing GraphicsConfiguration failed w/ "+capsChosen+" on "+screen); 
     }    
-    return new WrappedSurface(config, 0, width, height, lifecycleHook);
+    return new WrappedSurface(config, 0, upstreamHook, createNewDevice);
   }
 
   @Override
@@ -571,57 +571,15 @@ public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
     if(null == config) { 
         throw new GLException("Choosing GraphicsConfiguration failed w/ "+requestedCaps+" on "+screen);
     }    
-    return new GDISurface(config, 0, width, height, dummySurfaceLifecycleHook);
-  }  
-  private static final ProxySurface.UpstreamSurfaceHook dummySurfaceLifecycleHook = new ProxySurface.UpstreamSurfaceHook() {
-    @Override
-    public final void create(ProxySurface s) {
-        final GDISurface ms = (GDISurface)s;
-        if(0 == ms.getWindowHandle()) {            
-            final long windowHandle = GDIUtil.CreateDummyWindow(0, 0, s.getWidth(), s.getHeight());
-            if(0 == windowHandle) {
-                throw new GLException("Error windowHandle 0, werr: "+GDI.GetLastError());
-            }    
-            ms.setWindowHandle(windowHandle);
-            if(DEBUG) {
-                System.err.println("WindowsWGLDrawableFactory.dummySurfaceLifecycleHook.create: "+ms);
-            }
-        }
-    }
-    @Override
-    public final void destroy(ProxySurface s) {
-        final GDISurface ms = (GDISurface)s;
-        if(0 != ms.getWindowHandle()) {
-            GDI.ShowWindow(ms.getWindowHandle(), GDI.SW_HIDE);
-            GDIUtil.DestroyDummyWindow(ms.getWindowHandle());
-            ms.setWindowHandle(0);
-            if(DEBUG) {
-                System.err.println("WindowsWGLDrawableFactory.dummySurfaceLifecycleHook.destroy: "+ms);
-            }
-        }
-    }
-    @Override
-    public final int getWidth(ProxySurface s) {
-        return s.initialWidth;
-    }
-    @Override
-    public final int getHeight(ProxySurface s) {
-        return s.initialHeight;
-    }
-    
-    @Override
-    public String toString() {
-       return "GDISurfaceLifecycleHook[]";
-    }
-  };
-  
+    return new GDISurface(config, 0, new GDIDummyUpstreamSurfaceHook(width, height), createNewDevice);
+  }    
   
   @Override
   protected final ProxySurface createProxySurfaceImpl(AbstractGraphicsDevice deviceReq, int screenIdx, long windowHandle, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstream) {
     final WindowsGraphicsDevice device = new WindowsGraphicsDevice(deviceReq.getConnection(), deviceReq.getUnitID());
     final AbstractGraphicsScreen screen = new DefaultGraphicsScreen(device, screenIdx);
     final WindowsWGLGraphicsConfiguration cfg = WindowsWGLGraphicsConfigurationFactory.chooseGraphicsConfigurationStatic(capsRequested, capsRequested, chooser, screen);
-    return new GDISurface(cfg, windowHandle, 0, 0, upstream);
+    return new GDISurface(cfg, windowHandle, upstream, true);
   }
 
   @Override
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
index 4d1069e6b..058f4e336 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
@@ -107,7 +107,7 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
         if(hasARB) {
             caps = wglARBPFID2GLCapabilities(sharedResource, device, glp, hdc, pfdID, GLGraphicsConfigurationUtil.ALL_BITS);
         } else {
-            caps = PFD2GLCapabilities(glp, hdc, pfdID, GLGraphicsConfigurationUtil.ALL_BITS);
+            caps = PFD2GLCapabilities(device, glp, hdc, pfdID, GLGraphicsConfigurationUtil.ALL_BITS);
         }
         if(null==caps) {
             throw new GLException("Couldn't choose Capabilities by: HDC 0x"+Long.toHexString(hdc)+
@@ -325,7 +325,7 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
             throw new GLException("wglARBPFID2GLCapabilities: Error getting pixel format attributes for pixel format " + pfdID + 
                                   " of device context " + toHexString(hdc) + ", werr " + GDI.GetLastError());
         }
-        return AttribList2GLCapabilities(glp, hdc, pfdID, iattributes, niattribs, iresults, winattrbits);
+        return AttribList2GLCapabilities(device, glp, hdc, pfdID, iattributes, niattribs, iresults, winattrbits);
     }
 
     static int[] wglChoosePixelFormatARB(WindowsWGLDrawableFactory.SharedResource sharedResource, AbstractGraphicsDevice device,
@@ -390,7 +390,7 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
         for(int i = 0; i<numFormats; i++) {
             if ( pfdIDs[i] >= 1 &&
                  ((WindowsWGLContext)sharedResource.getContext()).getWGLExt().wglGetPixelFormatAttribivARB(hdc, pfdIDs[i], 0, niattribs, iattributes, 0, iresults, 0) ) {
-                final GLCapabilitiesImmutable caps = AttribList2GLCapabilities(glp, hdc, pfdIDs[i], iattributes, niattribs, iresults, winattrbits);
+                final GLCapabilitiesImmutable caps = AttribList2GLCapabilities(device, glp, hdc, pfdIDs[i], iattributes, niattribs, iresults, winattrbits);
                 if(null != caps) {
                     bucket.add(caps);
                     if(DEBUG) {
@@ -398,7 +398,7 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
                         System.err.println("wglARBPFIDs2GLCapabilities: bucket["+i+" -> "+j+"]: "+caps);
                     }
                 } else if(DEBUG) {
-                    GLCapabilitiesImmutable skipped = AttribList2GLCapabilities(glp, hdc, pfdIDs[i], iattributes, niattribs, iresults, GLGraphicsConfigurationUtil.ALL_BITS);
+                    GLCapabilitiesImmutable skipped = AttribList2GLCapabilities(device, glp, hdc, pfdIDs[i], iattributes, niattribs, iresults, GLGraphicsConfigurationUtil.ALL_BITS);
                     System.err.println("wglARBPFIDs2GLCapabilities: bucket["+i+" -> skip]: pfdID "+pfdIDs[i]+", "+skipped+", winattr "+GLGraphicsConfigurationUtil.winAttributeBits2String(null, winattrbits).toString());
                 }
             } else if (DEBUG) {
@@ -616,9 +616,9 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
         return val;
     }
 
-    static WGLGLCapabilities AttribList2GLCapabilities(final GLProfile glp, 
-                                                       final long hdc, final int pfdID, final int[] iattribs,
-                                                       final int niattribs, final int[] iresults, final int winattrmask) {
+    static WGLGLCapabilities AttribList2GLCapabilities(final AbstractGraphicsDevice device, 
+                                                       final GLProfile glp, final long hdc, final int pfdID,
+                                                       final int[] iattribs, final int niattribs, final int[] iresults, final int winattrmask) {
         final int allDrawableTypeBits = AttribList2DrawableTypeBits(iattribs, niattribs, iresults);
         int drawableTypeBits = winattrmask & allDrawableTypeBits;
 
@@ -637,7 +637,7 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
         }
         final WGLGLCapabilities res = new WGLGLCapabilities(pfd, pfdID, glp);
         res.setValuesByARB(iattribs, niattribs, iresults);
-        return (WGLGLCapabilities) GLGraphicsConfigurationUtil.setWinAttributeBits(res, drawableTypeBits);
+        return (WGLGLCapabilities) GLGraphicsConfigurationUtil.fixWinAttribBitsAndHwAccel(device, drawableTypeBits, res); 
     }
 
     //
@@ -672,7 +672,7 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
         return val;
     }
 
-    static WGLGLCapabilities PFD2GLCapabilities(final GLProfile glp, final long hdc, final int pfdID, final int winattrmask) {
+    static WGLGLCapabilities PFD2GLCapabilities(AbstractGraphicsDevice device, final GLProfile glp, final long hdc, final int pfdID, final int winattrmask) {
         PIXELFORMATDESCRIPTOR pfd = createPixelFormatDescriptor(hdc, pfdID);
         if(null == pfd) {
             return null;
@@ -689,21 +689,22 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
 
         final WGLGLCapabilities res = new WGLGLCapabilities(pfd, pfdID, glp);
         res.setValuesByGDI();
-        return (WGLGLCapabilities) GLGraphicsConfigurationUtil.setWinAttributeBits(res, drawableTypeBits );
+        return (WGLGLCapabilities) GLGraphicsConfigurationUtil.fixWinAttribBitsAndHwAccel(device, drawableTypeBits, res); 
    }
 
-    static WGLGLCapabilities PFD2GLCapabilitiesNoCheck(final GLProfile glp, final long hdc, final int pfdID) {
+    static WGLGLCapabilities PFD2GLCapabilitiesNoCheck(AbstractGraphicsDevice device, final GLProfile glp, final long hdc, final int pfdID) {
         PIXELFORMATDESCRIPTOR pfd = createPixelFormatDescriptor(hdc, pfdID);
-        return PFD2GLCapabilitiesNoCheck(glp, pfd, pfdID);
+        return PFD2GLCapabilitiesNoCheck(device, glp, pfd, pfdID);
    }
     
-   static WGLGLCapabilities PFD2GLCapabilitiesNoCheck(GLProfile glp, PIXELFORMATDESCRIPTOR pfd, int pfdID) {
+   static WGLGLCapabilities PFD2GLCapabilitiesNoCheck(AbstractGraphicsDevice device, GLProfile glp, PIXELFORMATDESCRIPTOR pfd, int pfdID) {
         if(null == pfd) {
             return null;
         }
         final WGLGLCapabilities res = new WGLGLCapabilities(pfd, pfdID, glp);
         res.setValuesByGDI();
-        return (WGLGLCapabilities) GLGraphicsConfigurationUtil.setWinAttributeBits(res, PFD2DrawableTypeBits(pfd));
+        
+        return (WGLGLCapabilities) GLGraphicsConfigurationUtil.fixWinAttribBitsAndHwAccel(device, PFD2DrawableTypeBits(pfd), res); 
    }
     
    static PIXELFORMATDESCRIPTOR GLCapabilities2PFD(GLCapabilitiesImmutable caps, PIXELFORMATDESCRIPTOR pfd) {
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
index 41c9bba02..d2d1dafc8 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
@@ -113,13 +113,14 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
     }
 
     protected static List<GLCapabilitiesImmutable> getAvailableCapabilities(WindowsWGLDrawableFactory factory, AbstractGraphicsDevice device) {
-        WindowsWGLDrawableFactory.SharedResource sharedResource = factory.getOrCreateSharedResource(device);
+        final WindowsWGLDrawableFactory.SharedResource sharedResource = factory.getOrCreateSharedResource(device);
         if(null == sharedResource) {
             throw new GLException("Shared resource for device n/a: "+device);
         }
-        GLDrawableImpl sharedDrawable = sharedResource.getDrawable();
-        GLCapabilitiesImmutable capsChosen = sharedDrawable.getChosenGLCapabilities();
-        GLContext sharedContext = sharedResource.getContext();
+        final GLDrawableImpl sharedDrawable = sharedResource.getDrawable();
+        final GLContext sharedContext = sharedResource.getContext();
+        final GLProfile glp = GLProfile.getDefault(device);
+
         List<GLCapabilitiesImmutable> availableCaps = null;
         
         if ( sharedResource.needsCurrentContext4ARBPFDQueries() ) {
@@ -135,10 +136,10 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
                 throw new GLException("Error: HDC is null");
             }
             if (sharedResource.hasARBPixelFormat()) {
-                availableCaps = WindowsWGLGraphicsConfigurationFactory.getAvailableGLCapabilitiesARB(sharedResource, sharedResource.getDevice(), capsChosen.getGLProfile(), hdc);
+                availableCaps = WindowsWGLGraphicsConfigurationFactory.getAvailableGLCapabilitiesARB(sharedResource, sharedResource.getDevice(), glp, hdc);
             }
             if( null == availableCaps || availableCaps.isEmpty() ) {
-                availableCaps = getAvailableGLCapabilitiesGDI(device, capsChosen.getGLProfile(), hdc);
+                availableCaps = getAvailableGLCapabilitiesGDI(device, glp, hdc);
             }
         } finally {
             if ( sharedResource.needsCurrentContext4ARBPFDQueries() ) {
@@ -165,7 +166,7 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
         int numFormats = pformats.length;
         List<GLCapabilitiesImmutable> bucket = new ArrayList<GLCapabilitiesImmutable>(numFormats);
         for (int i = 0; i < numFormats; i++) {
-            final GLCapabilitiesImmutable caps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(glProfile, hdc, pformats[i], GLGraphicsConfigurationUtil.ALL_BITS);
+            final GLCapabilitiesImmutable caps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(device, glProfile, hdc, pformats[i], GLGraphicsConfigurationUtil.ALL_BITS);
             if(null != caps) {
                 bucket.add(caps);
             }
@@ -439,7 +440,7 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
     private static boolean updateGraphicsConfigurationGDI(WindowsWGLGraphicsConfiguration config, CapabilitiesChooser chooser, long hdc,
                                                           boolean extHDC, int[] pformats) {
         GLCapabilitiesImmutable capsChosen = (GLCapabilitiesImmutable) config.getChosenCapabilities();
-        if(capsChosen.isPBuffer()) {
+        if( !capsChosen.isOnscreen() && capsChosen.isPBuffer() ) {
             if (DEBUG) {
                 System.err.println("updateGraphicsConfigurationGDI: no pbuffer supported on GDI: " + capsChosen);
             }
@@ -454,6 +455,7 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
             System.err.println("updateGraphicsConfigurationGDI: capsChosen "+capsChosen+", "+GLGraphicsConfigurationUtil.winAttributeBits2String(null, winattrmask).toString());
         }
         
+        AbstractGraphicsDevice device = config.getScreen().getDevice();
         int pfdID; // chosen or preset PFD ID
         WGLGLCapabilities pixelFormatCaps = null; // chosen or preset PFD ID's caps
         boolean pixelFormatSet = false; // indicates a preset PFD ID [caps]
@@ -468,7 +470,7 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
                         + ", pixelformat " + pfdID);
             }
             pixelFormatSet = true;
-            pixelFormatCaps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(glProfile, hdc, pfdID, winattrmask);
+            pixelFormatCaps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(device, glProfile, hdc, pfdID, winattrmask);
             if(null == pixelFormatCaps) {
                 throw new GLException("Could not map PFD2GLCaps w/ already chosen pfdID "+pfdID);
             }
@@ -480,7 +482,7 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
 
             List<GLCapabilitiesImmutable> availableCaps = new ArrayList<GLCapabilitiesImmutable>();
             for (int i = 0; i < pformats.length; i++) {
-                final GLCapabilitiesImmutable caps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(glProfile, hdc, pformats[i], winattrmask);
+                final GLCapabilitiesImmutable caps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(device, glProfile, hdc, pformats[i], winattrmask);
                 if(null != caps) {
                     availableCaps.add(caps);
                     if(DEBUG) {
@@ -488,7 +490,7 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
                         System.err.println("updateGraphicsConfigurationGDI: availableCaps["+i+" -> "+j+"]: "+caps);
                     }
                 } else if(DEBUG) {
-                    GLCapabilitiesImmutable skipped = WindowsWGLGraphicsConfiguration.PFD2GLCapabilitiesNoCheck(glProfile, hdc, pformats[i]);
+                    GLCapabilitiesImmutable skipped = WindowsWGLGraphicsConfiguration.PFD2GLCapabilitiesNoCheck(device, glProfile, hdc, pformats[i]);
                     System.err.println("updateGraphicsConfigurationGDI: availableCaps["+i+" -> skip]: pfdID "+pformats[i]+", "+skipped);
                 }
             }
@@ -505,8 +507,8 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
                      recommendedIndex--)
                 { /* nop */ }
                 if(DEBUG && 0 > recommendedIndex) {
-                    final GLCapabilitiesImmutable reqPFDCaps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilitiesNoCheck(glProfile, pfd, pfdID);
-                    final GLCapabilitiesImmutable chosenCaps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(glProfile, hdc, pfdID, winattrmask);
+                    final GLCapabilitiesImmutable reqPFDCaps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilitiesNoCheck(device, glProfile, pfd, pfdID);
+                    final GLCapabilitiesImmutable chosenCaps = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(device, glProfile, hdc, pfdID, winattrmask);
                     System.err.println("Chosen PFDID "+pfdID+", but not found in available caps (use given pfdIDs "+givenPFormats+", reqPFDCaps "+reqPFDCaps+", chosenCaps: "+chosenCaps);
                 }
             }
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXContext.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXContext.java
index 1f3edbd8a..03a0eefbf 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXContext.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXContext.java
@@ -48,10 +48,10 @@ import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
+import jogamp.nativewindow.WrappedSurface;
 import jogamp.opengl.GLContextImpl;
 import jogamp.opengl.GLContextShareSet;
 
-import com.jogamp.nativewindow.WrappedSurface;
 import com.jogamp.nativewindow.x11.X11GraphicsScreen;
 
 public class X11ExternalGLXContext extends X11GLXContext {
@@ -105,7 +105,7 @@ public class X11ExternalGLXContext extends X11GLXContext {
         cfg = X11GLXGraphicsConfiguration.create(glp, x11Screen, val[0]);
     }
 
-    final WrappedSurface ns = new WrappedSurface(cfg, drawable, w, h, null);
+    final WrappedSurface ns = new WrappedSurface(cfg, drawable, w, h, true);
     return new X11ExternalGLXContext(new Drawable(factory, ns), ctx);
   }
 
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXDrawable.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXDrawable.java
index 8652e2d4a..ac78c6f4a 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11ExternalGLXDrawable.java
@@ -45,7 +45,8 @@ import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
-import com.jogamp.nativewindow.WrappedSurface;
+import jogamp.nativewindow.WrappedSurface;
+
 import com.jogamp.nativewindow.x11.X11GraphicsScreen;
 
 
@@ -87,7 +88,7 @@ public class X11ExternalGLXDrawable extends X11GLXDrawable {
         System.err.println("X11ExternalGLXDrawable: WARNING: forcing GLX_RGBA_TYPE for newly created contexts (current 0x"+Integer.toHexString(val[0])+")");
       }
     }
-    return new X11ExternalGLXDrawable(factory, new WrappedSurface(cfg, drawable, w, h, null));
+    return new X11ExternalGLXDrawable(factory, new WrappedSurface(cfg, drawable, w, h, true));
   }
 
   @Override
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawable.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawable.java
index e9912ce9d..8c642777d 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawable.java
@@ -69,9 +69,10 @@ public abstract class X11GLXDrawable extends GLDrawableImpl {
   }
 
   @Override
-  protected final void swapBuffersImpl() {
-    // single-buffer is already filtered out @ GLDrawableImpl#swapBuffers()
-    GLX.glXSwapBuffers(getNativeSurface().getDisplayHandle(), getHandle());
+  protected final void swapBuffersImpl(boolean doubleBuffered) {
+    if(doubleBuffered) {
+        GLX.glXSwapBuffers(getNativeSurface().getDisplayHandle(), getHandle());
+    }
   }
 
   //---------------------------------------------------------------------------
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
index bc3e5b793..fb11f8bba 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
@@ -49,7 +49,7 @@ import javax.media.nativewindow.AbstractGraphicsScreen;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.NativeWindowFactory;
 import javax.media.nativewindow.ProxySurface;
-import javax.media.nativewindow.ProxySurface.UpstreamSurfaceHook;
+import javax.media.nativewindow.UpstreamSurfaceHook;
 import javax.media.nativewindow.VisualIDHolder;
 import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLCapabilitiesChooser;
@@ -59,6 +59,8 @@ import javax.media.opengl.GLDrawable;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
 
+import jogamp.nativewindow.WrappedSurface;
+import jogamp.nativewindow.x11.X11DummyUpstreamSurfaceHook;
 import jogamp.nativewindow.x11.X11Lib;
 import jogamp.nativewindow.x11.X11Util;
 import jogamp.opengl.DesktopGLDynamicLookupHelper;
@@ -70,7 +72,6 @@ import jogamp.opengl.GLGraphicsConfigurationUtil;
 import jogamp.opengl.SharedResourceRunner;
 
 import com.jogamp.common.util.VersionNumber;
-import com.jogamp.nativewindow.WrappedSurface;
 import com.jogamp.nativewindow.x11.X11GraphicsDevice;
 import com.jogamp.nativewindow.x11.X11GraphicsScreen;
 
@@ -505,7 +506,7 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
   protected final ProxySurface createMutableSurfaceImpl(AbstractGraphicsDevice deviceReq, boolean createNewDevice, 
                                                         GLCapabilitiesImmutable capsChosen,
                                                         GLCapabilitiesImmutable capsRequested,
-                                                        GLCapabilitiesChooser chooser, int width, int height, UpstreamSurfaceHook lifecycleHook) {
+                                                        GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstreamHook) {
     final X11GraphicsDevice device;
     if(createNewDevice) {
         // Null X11 locking, due to private non-shared Display handle
@@ -518,65 +519,15 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
     if(null == config) {
         throw new GLException("Choosing GraphicsConfiguration failed w/ "+capsChosen+" on "+screen); 
     }
-    return new WrappedSurface( config, 0, width, height, lifecycleHook);
+    return new WrappedSurface(config, 0, upstreamHook, createNewDevice);
   }
 
   @Override
   public final ProxySurface createDummySurfaceImpl(AbstractGraphicsDevice deviceReq, boolean createNewDevice, 
                                                    GLCapabilitiesImmutable requestedCaps, GLCapabilitiesChooser chooser, int width, int height) {
     final GLCapabilitiesImmutable chosenCaps = GLGraphicsConfigurationUtil.fixOnscreenGLCapabilities(requestedCaps);
-    return createMutableSurfaceImpl(deviceReq, createNewDevice, chosenCaps, requestedCaps, chooser, width, height, dummySurfaceLifecycleHook); 
+    return createMutableSurfaceImpl(deviceReq, createNewDevice, chosenCaps, requestedCaps, chooser, new X11DummyUpstreamSurfaceHook(width, height)); 
   }  
-  private static final ProxySurface.UpstreamSurfaceHook dummySurfaceLifecycleHook = new ProxySurface.UpstreamSurfaceHook() {
-    @Override
-    public final void create(ProxySurface s) {
-        if( 0 == s.getSurfaceHandle() ) {
-            final X11GLXGraphicsConfiguration cfg = (X11GLXGraphicsConfiguration) s.getGraphicsConfiguration();
-            final X11GraphicsScreen screen = (X11GraphicsScreen) cfg.getScreen();
-            final X11GraphicsDevice device = (X11GraphicsDevice) screen.getDevice();
-            if(0 == device.getHandle()) {
-                device.open();
-                s.setImplBitfield(ProxySurface.OWN_DEVICE);
-            }
-            final long windowHandle = X11Lib.CreateDummyWindow(device.getHandle(), screen.getIndex(), cfg.getXVisualID(), s.getWidth(), s.getHeight());
-            if(0 == windowHandle) {
-                throw new GLException("Creating dummy window failed w/ "+cfg+", "+s.getWidth()+"x"+s.getHeight());
-            }
-            s.setSurfaceHandle(windowHandle);
-            if(DEBUG) {
-                System.err.println("X11GLXDrawableFactory.dummySurfaceLifecycleHook.create: "+s);
-            }
-        }
-    }
-    @Override
-    public final void destroy(ProxySurface s) {
-        if(0 != s.getSurfaceHandle()) {
-            final X11GLXGraphicsConfiguration config = (X11GLXGraphicsConfiguration) s.getGraphicsConfiguration();
-            final X11GraphicsDevice device = (X11GraphicsDevice) config.getScreen().getDevice();
-            X11Lib.DestroyDummyWindow(device.getHandle(), s.getSurfaceHandle());            
-            s.setSurfaceHandle(0);
-            if( 0 != ( ProxySurface.OWN_DEVICE & s.getImplBitfield() ) ) {
-                device.close();
-            }
-            if(DEBUG) {
-                System.err.println("X11GLXDrawableFactory.dummySurfaceLifecycleHook.destroy: "+s);
-            }
-        }
-    }
-    @Override
-    public final int getWidth(ProxySurface s) {
-        return s.initialWidth;
-    }
-    @Override
-    public final int getHeight(ProxySurface s) {
-        return s.initialHeight;
-    }
-    @Override
-    public String toString() {
-       return "X11SurfaceLifecycleHook[]";
-    }
-  };
-  
   
   @Override
   protected final ProxySurface createProxySurfaceImpl(AbstractGraphicsDevice deviceReq, int screenIdx, long windowHandle, GLCapabilitiesImmutable capsRequested, GLCapabilitiesChooser chooser, UpstreamSurfaceHook upstream) {
@@ -593,7 +544,7 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
     if(DEBUG) {
         System.err.println("X11GLXDrawableFactory.createProxySurfaceImpl 0x"+Long.toHexString(windowHandle)+": "+cfg);
     }
-    return new WrappedSurface(cfg, windowHandle, 0, 0, upstream);
+    return new WrappedSurface(cfg, windowHandle, upstream, true);
   }
 
   @Override
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXGraphicsConfiguration.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXGraphicsConfiguration.java
index 866fcbbe4..96c3c4123 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXGraphicsConfiguration.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXGraphicsConfiguration.java
@@ -307,7 +307,7 @@ public class X11GLXGraphicsConfiguration extends X11GraphicsConfiguration implem
       return null; // no RGBA -> color index not supported
     }
 
-    X11GLCapabilities res = new X11GLCapabilities(visualInfo, fbcfg, fbcfgid, glp);
+    final X11GLCapabilities res = new X11GLCapabilities(visualInfo, fbcfg, fbcfgid, glp);
     if (isMultisampleAvailable) {
       res.setSampleBuffers(glXGetFBConfig(display, fbcfg, GLX.GLX_SAMPLE_BUFFERS, tmp, 0) != 0);
       res.setNumSamples   (glXGetFBConfig(display, fbcfg, GLX.GLX_SAMPLES,        tmp, 0));
@@ -342,7 +342,7 @@ public class X11GLXGraphicsConfiguration extends X11GraphicsConfiguration implem
         res.setPbufferFloatingPointBuffers(glXGetFBConfig(display, fbcfg, GLXExt.GLX_FLOAT_COMPONENTS_NV, tmp, 0) != GL.GL_FALSE);
     } catch (Exception e) {}
 
-    return (X11GLCapabilities) GLGraphicsConfigurationUtil.setWinAttributeBits(res, drawableTypeBits);
+    return (X11GLCapabilities) GLGraphicsConfigurationUtil.fixWinAttribBitsAndHwAccel(device, drawableTypeBits, res); 
   }
 
   private static String glXGetFBConfigErrorCode(int err) {
@@ -462,7 +462,7 @@ public class X11GLXGraphicsConfiguration extends X11GraphicsConfiguration implem
     res.setAccumBlueBits (glXGetConfig(display, info, GLX.GLX_ACCUM_BLUE_SIZE,  tmp, 0));
     res.setAccumAlphaBits(glXGetConfig(display, info, GLX.GLX_ACCUM_ALPHA_SIZE, tmp, 0));
 
-    return (X11GLCapabilities) GLGraphicsConfigurationUtil.setWinAttributeBits(res, drawableTypeBits);
+    return (X11GLCapabilities) GLGraphicsConfigurationUtil.fixWinAttribBitsAndHwAccel(device, drawableTypeBits, res); 
   }
 
   private static String glXGetConfigErrorCode(int err) {
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXGraphicsConfigurationFactory.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXGraphicsConfigurationFactory.java
index 8086cd26a..431706e24 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXGraphicsConfigurationFactory.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXGraphicsConfigurationFactory.java
@@ -129,9 +129,7 @@ public class X11GLXGraphicsConfigurationFactory extends GLGraphicsConfigurationF
         }
         final X11GraphicsScreen sharedScreen = (X11GraphicsScreen) sharedResource.getScreen();
         final boolean isMultisampleAvailable = factory.isGLXMultisampleAvailable(sharedScreen.getDevice());
-        final X11GLXDrawable sharedDrawable = (X11GLXDrawable) sharedResource.getDrawable();
-        final GLCapabilitiesImmutable capsChosen = sharedDrawable.getChosenGLCapabilities();
-        final GLProfile glp = capsChosen.getGLProfile();
+        final GLProfile glp = GLProfile.getDefault(device);
 
         List<GLCapabilitiesImmutable> availableCaps = null;
 
@@ -217,7 +215,7 @@ public class X11GLXGraphicsConfigurationFactory extends GLGraphicsConfigurationF
         X11GLXDrawableFactory factory = (X11GLXDrawableFactory) GLDrawableFactory.getDesktopFactory();
 
         capsChosen = GLGraphicsConfigurationUtil.fixGLCapabilities( capsChosen, GLContext.isFBOAvailable(x11Device, capsChosen.getGLProfile()), factory.canCreateGLPbuffer(x11Device) );
-        boolean usePBuffer = capsChosen.isPBuffer();
+        boolean usePBuffer = !capsChosen.isOnscreen() && capsChosen.isPBuffer();
     
         X11GLXGraphicsConfiguration res = null;
         if( factory.isGLXVersionGreaterEqualOneThree(x11Device) ) {
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11PbufferGLXDrawable.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11PbufferGLXDrawable.java
index e1fe2f27e..bba2b3513 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11PbufferGLXDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11PbufferGLXDrawable.java
@@ -81,10 +81,11 @@ public class X11PbufferGLXDrawable extends X11GLXDrawable {
   }
 
   private void createPbuffer() {
-      X11GLXGraphicsConfiguration config = (X11GLXGraphicsConfiguration) getNativeSurface().getGraphicsConfiguration();
-      AbstractGraphicsScreen aScreen = config.getScreen();
-      AbstractGraphicsDevice aDevice = aScreen.getDevice();
-      long display = aDevice.getHandle();
+      final MutableSurface ms = (MutableSurface) getNativeSurface();
+      final X11GLXGraphicsConfiguration config = (X11GLXGraphicsConfiguration) ms.getGraphicsConfiguration();
+      final AbstractGraphicsScreen aScreen = config.getScreen();
+      final AbstractGraphicsDevice aDevice = aScreen.getDevice();
+      final long display = aDevice.getHandle();
 
       if (DEBUG) {
         System.out.println("Pbuffer config: " + config);
@@ -94,8 +95,6 @@ public class X11PbufferGLXDrawable extends X11GLXDrawable {
         throw new GLException("Null display");
       }
 
-      NativeSurface ns = getNativeSurface();
-
       GLCapabilitiesImmutable chosenCaps = (GLCapabilitiesImmutable)config.getChosenCapabilities();
 
       if (chosenCaps.getPbufferRenderToTexture()) {
@@ -111,9 +110,9 @@ public class X11PbufferGLXDrawable extends X11GLXDrawable {
       int[] iattributes = new int[7];
 
       iattributes[niattribs++] = GLX.GLX_PBUFFER_WIDTH;
-      iattributes[niattribs++] = ns.getWidth();
+      iattributes[niattribs++] = ms.getWidth();
       iattributes[niattribs++] = GLX.GLX_PBUFFER_HEIGHT;
-      iattributes[niattribs++] = ns.getHeight();
+      iattributes[niattribs++] = ms.getHeight();
       iattributes[niattribs++] = GLX.GLX_LARGEST_PBUFFER; // exact
       iattributes[niattribs++] = 0;
       iattributes[niattribs++] = 0;
@@ -125,7 +124,7 @@ public class X11PbufferGLXDrawable extends X11GLXDrawable {
       }
 
       // Set up instance variables
-      ((MutableSurface)ns).setSurfaceHandle(pbuffer);
+      ms.setSurfaceHandle(pbuffer);
 
       if (DEBUG) {
         System.err.println("Created pbuffer " + this);