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].

9 files changed, 529 insertions, 383 deletions

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