diff --git a/VisualStudio/Demos/osgpbuffer/osgpbuffer.dsp b/VisualStudio/Demos/osgpbuffer/osgpbuffer.dsp
new file mode 100644
index 000000000..b7440ba89
--- /dev/null
+++ b/VisualStudio/Demos/osgpbuffer/osgpbuffer.dsp
@@ -0,0 +1,114 @@
+# Microsoft Developer Studio Project File - Name="Demo osgpbuffer" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Console Application" 0x0103
+
+CFG=Demo osgpbuffer - Win32 Debug
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "osgpbuffer.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "osgpbuffer.mak" CFG="Demo osgpbuffer - Win32 Debug"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "Demo osgpbuffer - Win32 Release" (based on "Win32 (x86) Console Application")
+!MESSAGE "Demo osgpbuffer - Win32 Debug" (based on "Win32 (x86) Console Application")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "Demo osgpbuffer - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+# ADD CPP /nologo /MD /W3 /GR /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+# ADD BASE RSC /l 0x414 /d "NDEBUG"
+# ADD RSC /l 0x414 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
+# ADD LINK32 osgGLUT.lib osgDB.lib osgGA.lib osgUtil.lib osg.lib opengl32.lib glu32.lib /nologo /subsystem:console /pdb:none /machine:I386 /out:"../../../bin/osgpbuffer.exe"
+
+!ELSEIF  "$(CFG)" == "Demo osgpbuffer - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "Debug"
+# PROP Intermediate_Dir "Debug"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Gm /GR /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+# ADD BASE RSC /l 0x414 /d "_DEBUG"
+# ADD RSC /l 0x414 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 osgGLUTd.lib osgDBd.lib osgGAd.lib osgUtild.lib osgd.lib opengl32.lib glu32.lib /nologo /subsystem:console /debug /machine:I386 /out:"../../../bin/osgpbufferd.exe" /pdbtype:sept
+
+!ENDIF 
+
+# Begin Target
+
+# Name "Demo osgpbuffer - Win32 Release"
+# Name "Demo osgpbuffer - Win32 Debug"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=..\..\..\src\Demos\osgpbuffer\osgpbuffer.cpp
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\src\Demos\osgpbuffer\pbuffer.cpp
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\src\Demos\osgpbuffer\RenderToTextureStage.cpp
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# Begin Source File
+
+SOURCE=..\..\..\src\Demos\osgpbuffer\pbuffer.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\src\Demos\osgpbuffer\RenderToTextureStage.h
+# End Source File
+# End Group
+# End Target
+# End Project
diff --git a/VisualStudio/VisualStudio.dsw b/VisualStudio/VisualStudio.dsw
index 13205c7ef..6947e47ee 100644
--- a/VisualStudio/VisualStudio.dsw
+++ b/VisualStudio/VisualStudio.dsw
@@ -705,6 +705,33 @@ Package=<4>
 
 ###############################################################################
 
+Project: "Demo osgpbuffer"=.\Demos\osgpbuffer\osgpbuffer.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+    Begin Project Dependency
+    Project_Dep_Name Core osg
+    End Project Dependency
+    Begin Project Dependency
+    Project_Dep_Name Core osgDB
+    End Project Dependency
+    Begin Project Dependency
+    Project_Dep_Name Core osgGA
+    End Project Dependency
+    Begin Project Dependency
+    Project_Dep_Name Core osgGLUT
+    End Project Dependency
+    Begin Project Dependency
+    Project_Dep_Name Core osgUtil
+    End Project Dependency
+}}}
+
+###############################################################################
+
 Project: "Demo osgshadowtexture"=.\Demos\osgshadowtexture\osgshadowtexture.dsp - Package Owner=<4>
 
 Package=<5>
diff --git a/src/Demos/osglogo/osglogo.cpp b/src/Demos/osglogo/osglogo.cpp
index 83ebd202a..d02b6c1b1 100644
--- a/src/Demos/osglogo/osglogo.cpp
+++ b/src/Demos/osglogo/osglogo.cpp
@@ -197,8 +197,8 @@ osg::Node* createLogo()
                      osg::Matrix::translate(bb.center()));
 
     // add the box and globe to it.
-    xform->addChild(createBox(bb,chordRatio));
-    //xform->addChild(createBoxNo5(bb,chordRatio));
+    //xform->addChild(createBox(bb,chordRatio));
+    xform->addChild(createBoxNo5(bb,chordRatio));
 
     // add the transform to the group.
     group->addChild(xform);
diff --git a/src/Demos/osgpbuffer/RenderToTextureStage.cpp b/src/Demos/osgpbuffer/RenderToTextureStage.cpp
new file mode 100644
index 000000000..c24cb64b2
--- /dev/null
+++ b/src/Demos/osgpbuffer/RenderToTextureStage.cpp
@@ -0,0 +1,80 @@
+#include <cassert>
+//#include <osgDB/ReadFile>
+
+#include "RenderToTextureStage.h"
+
+//using namespace osg;
+//using namespace osgUtil;
+
+// register a RenderToTextureStage prototype with the RenderBin prototype list.
+//RegisterRenderBinProxy<RenderToTextureStage> s_registerRenderToTextureStageProxy;
+
+MyRenderToTextureStage::MyRenderToTextureStage()
+{
+    _pbuffer = 0L;
+}
+
+MyRenderToTextureStage::~MyRenderToTextureStage()
+{
+}
+
+void MyRenderToTextureStage::reset()
+{
+    RenderStage::reset();
+}
+
+void MyRenderToTextureStage::draw(osg::State& state, osgUtil::RenderLeaf*& previous)
+{
+    if (_pbuffer && _texture.valid())
+    {
+        // Create pbuffer texture
+        const osg::uint contextID = state.getContextID();
+        GLuint& handle = _texture->getTextureObject(contextID);
+        if (handle == 0)
+        {
+            // Create dynamic texture, subload callback required.
+            _texture->apply(state);
+        }
+    
+        HDC hdc = ::wglGetCurrentDC();
+        HGLRC hglrc = ::wglGetCurrentContext();
+
+        // Release pbuffer from "render to texture".
+        _pbuffer->releaseTexImage();
+
+        // Make the p-buffer's context current.
+        _pbuffer->makeCurrent();
+
+        // Render in p-buffer.
+        RenderStage::draw(state,previous);
+
+        // restore window's context as current.
+        if (!::wglMakeCurrent(hdc, hglrc))
+        {
+            assert(0);
+        }
+
+        if (true /*_isRenderTextureSupported*/)
+        {
+            // transfer contents of p-buffer to texture
+            _pbuffer->bindTexImage(handle);
+        }
+        else
+        {
+// TODO:
+//          _pbuffer->copyTexImage(state);
+        }
+
+    }
+    else
+    {
+        RenderStage::draw(state,previous);
+
+        // now copy the rendered image to attached texture.
+        if (_texture.valid())
+            _texture->copyTexImage2D(state,_viewport->x(),_viewport->y(),_viewport->width(),_viewport->height());
+    
+        if (_image.valid())
+            _image->readPixels(_viewport->x(),_viewport->y(),_viewport->width(),_viewport->height(),GL_RGBA,GL_UNSIGNED_BYTE);
+    }
+}
diff --git a/src/Demos/osgpbuffer/RenderToTextureStage.h b/src/Demos/osgpbuffer/RenderToTextureStage.h
new file mode 100644
index 000000000..16d9ec858
--- /dev/null
+++ b/src/Demos/osgpbuffer/RenderToTextureStage.h
@@ -0,0 +1,60 @@
+//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
+//Distributed under the terms of the GNU Library General Public License (LGPL)
+//as published by the Free Software Foundation.
+
+#ifndef RENDERTOTEXTURESTAGE
+#define RENDERTOTEXTURESTAGE 1
+
+#include <osg/Texture2D>
+
+#include <osgUtil/RenderStage>
+
+#include "pbuffer.h"
+
+// namespace osgUtil {
+
+/**
+ * RenderStage which copies the final image to an attached texture or image.
+ * Generally used as a pre-rendering stage.
+ */
+class /*OSGUTIL_EXPORT*/ MyRenderToTextureStage : public osgUtil::RenderStage
+{
+    public:
+    
+
+        MyRenderToTextureStage();
+        
+        virtual osg::Object* cloneType() const { return osgNew MyRenderToTextureStage(); }
+        virtual osg::Object* clone(const osg::CopyOp&) const { return osgNew MyRenderToTextureStage(); } // note only implements a clone of type.
+        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const MyRenderToTextureStage*>(obj)!=0L; }
+        virtual const char* libraryName() const { return ""; }
+        virtual const char* className() const { return "MyRenderToTextureStage"; }
+
+        inline void setPBuffer(PBuffer* pbuffer) { _pbuffer = pbuffer; }
+
+        virtual void reset();
+        
+        void setTexture(osg::Texture2D* texture) { _texture = texture; }
+        osg::Texture2D* getTexture() { return _texture.get(); }
+        
+        void setImage(osg::Image* image) { _image = image; }
+        osg::Image* getImage() { return _image.get(); }
+
+        virtual void draw(osg::State& state,osgUtil::RenderLeaf*& previous);
+
+    public:
+        
+        
+    protected:
+    
+        virtual ~MyRenderToTextureStage();
+        
+        osg::ref_ptr<osg::Texture2D> _texture;
+        osg::ref_ptr<osg::Image> _image;
+        PBuffer* _pbuffer;
+};
+
+// }
+
+#endif
+
diff --git a/src/Demos/osgpbuffer/osgpbuffer.cpp b/src/Demos/osgpbuffer/osgpbuffer.cpp
new file mode 100644
index 000000000..ee1f70fac
--- /dev/null
+++ b/src/Demos/osgpbuffer/osgpbuffer.cpp
@@ -0,0 +1,659 @@
+#include <cassert>
+
+#include <osg/GLExtensions>
+#include <osg/Node>
+#include <osg/Geometry>
+#include <osg/Notify>
+#include <osg/MatrixTransform>
+#include <osg/Texture2D>
+#include <osg/Stencil>
+#include <osg/ColorMask>
+#include <osg/Depth>
+#include <osg/Billboard>
+#include <osg/Material>
+
+#include <osgGA/TrackballManipulator>
+#include <osgGA/FlightManipulator>
+#include <osgGA/DriveManipulator>
+
+#include <osgUtil/TransformCallback>
+#include <osgUtil/SmoothingVisitor>
+
+#include <osgDB/Registry>
+#include <osgDB/ReadFile>
+
+#include <osgGLUT/glut>
+#include <osgGLUT/Viewer>
+
+#include "RenderToTextureStage.h"
+#include "pbuffer.h"
+
+
+PBuffer* g_pPixelBuffer;
+
+
+class MyAppCallback : public osg::NodeCallback
+{
+    public:
+    
+        MyAppCallback(osg::Node* subgraph):
+            _subgraph(subgraph) {}
+
+        virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
+        {
+            // traverse the subgraph to update any nodes.
+            if (_subgraph.valid()) _subgraph->accept(*nv);
+        
+            // must traverse the Node's subgraph            
+            traverse(node,nv);
+        }
+        
+        osg::ref_ptr<osg::Node>     _subgraph;
+};
+
+class MyCullCallback : public osg::NodeCallback
+{
+    public:
+    
+        MyCullCallback(osg::Node* subgraph,osg::Texture2D* texture):
+            _subgraph(subgraph),
+            _texture(texture)
+        {
+        }
+
+        virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
+        {
+
+            osgUtil::CullVisitor* cullVisitor = dynamic_cast<osgUtil::CullVisitor*>(nv);
+            if (cullVisitor && _texture.valid() && _subgraph.valid())
+                doPreRender(*node,*cullVisitor);
+
+            // must traverse the subgraph            
+            traverse(node,nv);
+        }
+        
+        void doPreRender(osg::Node& node, osgUtil::CullVisitor& cv);
+        
+        osg::ref_ptr<osg::Node>      _subgraph;
+        osg::ref_ptr<osg::Texture2D> _texture;
+};
+
+
+void MyCullCallback::doPreRender(osg::Node&, osgUtil::CullVisitor& cv)
+{   
+    const osg::BoundingSphere& bs = _subgraph->getBound();
+    if (!bs.valid())
+    {
+        osg::notify(osg::WARN) << "bb invalid"<<_subgraph.get()<<std::endl;
+        return;
+    }
+
+    // create the render to texture stage.
+    osg::ref_ptr<MyRenderToTextureStage> rtts = osgNew MyRenderToTextureStage;
+    rtts->setPBuffer(g_pPixelBuffer);
+
+    // set up lighting.
+    // currently ignore lights in the scene graph itself..
+    // will do later.
+    osgUtil::RenderStage* previous_stage = cv.getCurrentRenderBin()->_stage;
+
+    // set up the background color and clear mask.
+    rtts->setClearColor(osg::Vec4(0.1f,0.9f,0.3f,1.0f));
+    rtts->setClearMask(previous_stage->getClearMask());
+
+    // set up to charge the same RenderStageLighting is the parent previous stage.
+    rtts->setRenderStageLighting(previous_stage->getRenderStageLighting());
+
+
+    // record the render bin, to be restored after creation
+    // of the render to text
+    osgUtil::RenderBin* previousRenderBin = cv.getCurrentRenderBin();
+
+    // set the current renderbin to be the newly created stage.
+    cv.setCurrentRenderBin(rtts.get());
+
+    float znear = 1.0f*bs.radius();
+    float zfar  = 3.0f*bs.radius();
+        
+    // 2:1 aspect ratio as per flag geomtry below.
+    float top   = 0.25f*znear;
+    float right = 0.5f*znear;
+
+    znear *= 0.9f;
+    zfar *= 1.1f;
+
+    // set up projection.
+    osg::Matrix* projection = osgNew osg::Matrix;
+    projection->makeFrustum(-right,right,-top,top,znear,zfar);
+
+    cv.pushProjectionMatrix(projection);
+
+    osg::Matrix* matrix = new osg::Matrix;
+    matrix->makeLookAt(bs.center()+osg::Vec3(0.0f,2.0f,0.0f)*bs.radius(),bs.center(),osg::Vec3(0.0f,0.0f,1.0f));
+
+    cv.pushModelViewMatrix(matrix);
+
+    osg::ref_ptr<osg::StateSet> dummyState = osgNew osg::StateSet;
+
+    cv.pushStateSet(dummyState.get());
+
+    {
+        // traverse the subgraph
+        _subgraph->accept(cv);
+    }
+
+    cv.popStateSet();
+
+    // restore the previous model view matrix.
+    cv.popModelViewMatrix();
+
+    // restore the previous model view matrix.
+    cv.popProjectionMatrix();
+
+    // restore the previous renderbin.
+    cv.setCurrentRenderBin(previousRenderBin);
+
+    if (rtts->_renderGraphList.size()==0 && rtts->_bins.size()==0)
+    {
+        // getting to this point means that all the subgraph has been
+        // culled by small feature culling or is beyond LOD ranges.
+        return;
+    }
+
+
+
+    int height = 512;
+    int width  = 512;
+
+
+    const osg::Viewport& viewport = *cv.getViewport();
+
+    // offset the impostor viewport from the center of the main window
+    // viewport as often the edges of the viewport might be obscured by
+    // other windows, which can cause image/reading writing problems.
+    int center_x = viewport.x()+viewport.width()/2;
+    int center_y = viewport.y()+viewport.height()/2;
+
+    osg::Viewport* new_viewport = new osg::Viewport;
+//  new_viewport->setViewport(center_x-width/2,center_y-height/2,width,height);
+new_viewport->setViewport(0,0,width,height);
+    rtts->setViewport(new_viewport);
+
+    dummyState->setAttribute(new_viewport);    
+
+    // and the render to texture stage to the current stages
+    // dependancy list.
+    cv.getCurrentRenderBin()->_stage->addToDependencyList(rtts.get());
+
+    // if one exist attach texture to the RenderToTextureStage.
+    if (_texture.valid()) rtts->setTexture(_texture.get());
+
+    // if one exist attach image to the RenderToTextureStage.
+//    if (_image.valid()) rtts->setImage(_image.get());
+
+}
+
+
+// call back which cretes a deformation field to oscilate the model.
+class MyGeometryCallback : 
+    public osg::Drawable::AppCallback, 
+    public osg::Drawable::AttributeFunctor
+{
+    public:
+    
+        MyGeometryCallback(const osg::Vec3& o,
+                           const osg::Vec3& x,const osg::Vec3& y,const osg::Vec3& z,
+                           double period,double xphase,double amplitude):
+            _firstCall(true),
+            _startTime(0.0),
+            _time(0.0),
+            _period(period),
+            _xphase(xphase),
+            _amplitude(amplitude),
+            _origin(o),
+            _xAxis(x),
+            _yAxis(y),
+            _zAxis(z) {}
+    
+        virtual void app(osg::NodeVisitor* nv,osg::Drawable* drawable)
+        {
+            const osg::FrameStamp* fs = nv->getFrameStamp();
+            double referenceTime = fs->getReferenceTime();
+            if (_firstCall)
+            {
+                _firstCall = false;
+                _startTime = referenceTime;
+            }
+            
+            _time = referenceTime-_startTime;
+            
+            drawable->accept(*this);
+            drawable->dirtyBound();
+            
+            osg::Geometry* geometry = dynamic_cast<osg::Geometry*>(drawable);
+            if (geometry)
+            {
+                osgUtil::SmoothingVisitor::smooth(*geometry);
+            }
+            
+        }
+        
+        virtual void apply(osg::Drawable::AttributeType type,unsigned int count,osg::Vec3* begin) 
+        {
+            if (type == osg::Drawable::VERTICES)
+            {
+                const float TwoPI=2.0f*osg::PI;
+                const float phase = -_time/_period;
+                
+                osg::Vec3* end = begin+count;
+                for (osg::Vec3* itr=begin;itr<end;++itr)
+                {
+                    osg::Vec3 dv(*itr-_origin);
+                    osg::Vec3 local(dv*_xAxis,dv*_yAxis,dv*_zAxis);
+                    
+                    local.z() = local.x()*_amplitude*
+                                sinf(TwoPI*(phase+local.x()*_xphase)); 
+                    
+                    (*itr) = _origin + 
+                             _xAxis*local.x()+
+                             _yAxis*local.y()+
+                             _zAxis*local.z();
+                }
+            }
+        }
+
+        bool    _firstCall;
+
+        double  _startTime;
+        double  _time;
+        
+        double  _period;
+        double  _xphase;
+        float   _amplitude;
+
+        osg::Vec3   _origin;
+        osg::Vec3   _xAxis;
+        osg::Vec3   _yAxis;
+        osg::Vec3   _zAxis;
+        
+};
+
+
+// Custom Texture subload callback, just acts the the standard subload modes in osg::Texture right now
+// but code be used to define your own style callbacks.
+class MyTextureSubloadCallback : public osg::Texture2D::SubloadCallback
+{
+    public:
+    
+        MyTextureSubloadCallback():
+            _subloadMode(AUTO),
+            _textureWidth(0),
+            _textureHeight(0),
+            _subloadTextureOffsetX(0),
+            _subloadTextureOffsetY(0),
+            _subloadImageOffsetX(0),
+            _subloadImageOffsetY(0),
+            _subloadImageWidth(0),
+            _subloadImageHeight(0)
+        {
+        }
+
+        enum SubloadMode {
+            OFF,
+            AUTO,
+            IF_DIRTY
+        };
+
+        /** Set the texture subload mode. */
+        inline void setSubloadMode(const SubloadMode mode) { _subloadMode = mode; }
+
+        /** Get the texture subload mode. */
+        inline const SubloadMode getSubloadMode() const { return _subloadMode; }
+
+        /** Set the texture subload texture offsets. */
+        inline void setSubloadTextureOffset(const int x, const int y)
+        {
+            _subloadTextureOffsetX = x;
+            _subloadTextureOffsetY = y;
+        }
+
+        /** Get the texture subload texture offsets. */
+        inline void getSubloadTextureOffset(int& x, int& y) const
+        {
+            x = _subloadTextureOffsetX;
+            y = _subloadTextureOffsetY;
+        }
+        
+        /** Set the texture subload width. If width or height are zero then
+          * the repsective size value is calculated from the source image sizes. */
+        inline void setSubloadTextureSize(const int width, const int height)
+        {
+            _textureWidth = width;
+            _textureHeight = height;
+        }
+
+        /** Get the texture subload width. */
+        inline void getSubloadTextureSize(int& width, int& height) const
+        {
+            width = _textureWidth;
+            height = _textureHeight;
+        }
+
+
+        /** Set the subload image offsets. */
+        inline void setSubloadImageOffset(const int x, const int y)
+        {
+            _subloadImageOffsetX = x;
+            _subloadImageOffsetY = y;
+        }
+
+        /** Get the subload image offsets. */
+        inline void getSubloadImageOffset(int& x, int& y) const
+        {
+            x = _subloadImageOffsetX;
+            y = _subloadImageOffsetY;
+        }
+
+        /** Set the image subload width. If width or height are zero then
+          * the repsective size value is calculated from the source image sizes. */
+        inline void setSubloadImageSize(const int width, const int height)
+        {
+            _subloadImageWidth = width;
+            _subloadImageHeight = height;
+        }
+
+        /** Get the image subload width. */
+        inline void getSubloadImageSize(int& width, int& height) const
+        {
+            width = _subloadImageWidth;
+            height = _subloadImageHeight;
+        }
+    
+    
+    
+        virtual void load(const osg::Texture2D& texture,osg::State&) const
+        {
+            osg::notify(osg::INFO)<<"doing load"<<std::endl;
+/*
+            static bool s_SGIS_GenMipmap = osg::isGLExtensionSupported("GL_SGIS_generate_mipmap");
+
+            if (s_SGIS_GenMipmap && (texture.getFilter(osg::Texture2D::MIN_FILTER) != osg::Texture2D::LINEAR && texture.getFilter(osg::Texture2D::MIN_FILTER) != osg::Texture2D::NEAREST))
+            {
+                texture.setNumMipmapLevels(1); // will leave this at one, since the mipmap will be created internally by OpenGL.
+                glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
+            }
+            else
+            {
+                texture.setNumMipmapLevels(1);
+            }
+
+
+            GLsizei width = (_subloadImageWidth>0)?_subloadImageWidth:texture.getImage()->s();
+            GLsizei height = (_subloadImageHeight>0)?_subloadImageHeight:texture.getImage()->t();
+
+        
+            bool sizeChanged = false;
+            if (_textureWidth==0)
+            {
+                // need to calculate texture dimension
+                sizeChanged = true;
+                _textureWidth = 1;
+                for (; _textureWidth < (static_cast<GLsizei>(_subloadTextureOffsetX) + width); _textureWidth <<= 1) {}
+             }
+
+            if (_textureHeight==0)
+            {
+                // need to calculate texture dimension
+                sizeChanged = true;
+                _textureHeight = 1;
+                for (; _textureHeight < (static_cast<GLsizei>(_subloadTextureOffsetY) + height); _textureHeight <<= 1) {}
+            }
+            
+            if (sizeChanged)
+            {
+                texture.setTextureSize(_textureWidth, _textureHeight);
+            }
+*/
+#if 0
+            // reserve appropriate texture memory
+            glTexImage2D(GL_TEXTURE_2D, 0, texture.getInternalFormat(),
+                         _textureWidth, _textureHeight, 0,
+                         (GLenum) texture.getImage()->getPixelFormat(), (GLenum) texture.getImage()->getDataType(),
+                         NULL);
+
+
+            glPixelStorei(GL_UNPACK_ROW_LENGTH,texture.getImage()->s());
+            
+
+            glTexSubImage2D(GL_TEXTURE_2D, 0,
+                            _subloadTextureOffsetX, _subloadTextureOffsetY,
+                            width, height,
+                            (GLenum) texture.getImage()->getPixelFormat(), (GLenum) texture.getImage()->getDataType(),
+                            texture.getImage()->data(_subloadImageOffsetX,_subloadImageOffsetY));
+
+            glPixelStorei(GL_UNPACK_ROW_LENGTH,0);
+#else
+	        glTexImage2D( GL_TEXTURE_2D, 0, texture.getInternalFormat(), _textureWidth, _textureHeight, 0, GL_RGB, GL_FLOAT, 0 );
+#endif
+        }
+        
+        virtual void subload(const osg::Texture2D& texture,osg::State&) const
+        {
+            osg::notify(osg::INFO)<<"doing subload"<<std::endl;
+#if 0        
+            glPixelStorei(GL_UNPACK_ROW_LENGTH,texture.getImage()->s());
+
+            glTexSubImage2D(GL_TEXTURE_2D, 0,
+                            _subloadTextureOffsetX, _subloadTextureOffsetY,
+                            (_subloadImageWidth>0)?_subloadImageWidth:texture.getImage()->s(), (_subloadImageHeight>0)?_subloadImageHeight:texture.getImage()->t(),
+                            (GLenum) texture.getImage()->getPixelFormat(), (GLenum) texture.getImage()->getDataType(),
+                            texture.getImage()->data(_subloadImageOffsetX,_subloadImageOffsetY));
+
+            glPixelStorei(GL_UNPACK_ROW_LENGTH,0);
+#else
+#endif
+        }
+
+
+        SubloadMode _subloadMode;
+        mutable GLsizei _textureWidth, _textureHeight;
+        GLint _subloadTextureOffsetX, _subloadTextureOffsetY;
+        GLint _subloadImageOffsetX, _subloadImageOffsetY;
+        GLsizei _subloadImageWidth, _subloadImageHeight;
+};
+
+
+
+osg::Node* createPreRenderSubGraph(osg::Node* subgraph)
+{
+    if (!subgraph) return 0;
+ 
+    // create the quad to visualize.
+    osg::Geometry* polyGeom = new osg::Geometry();
+
+    polyGeom->setSupportsDisplayList(false);
+
+    osg::Vec3 origin(0.0f,0.0f,0.0f);
+    osg::Vec3 xAxis(1.0f,0.0f,0.0f);
+    osg::Vec3 yAxis(0.0f,0.0f,1.0f);
+    osg::Vec3 zAxis(0.0f,-1.0f,0.0f);
+    float height = 100.0f;
+    float width = 200.0f;
+    int noSteps = 20;
+    
+    osg::Vec3Array* vertices = new osg::Vec3Array;
+    osg::Vec3 bottom = origin;
+    osg::Vec3 top = origin; top.z()+= height;
+    osg::Vec3 dv = xAxis*(width/((float)(noSteps-1)));
+    
+    osg::Vec2Array* texcoords = new osg::Vec2Array;
+    osg::Vec2 bottom_texcoord(0.0f,0.0f);
+    osg::Vec2 top_texcoord(0.0f,1.0f);
+    osg::Vec2 dv_texcoord(1.0f/(float)(noSteps-1),0.0f);
+
+    for(int i=0;i<noSteps;++i)
+    {
+        vertices->push_back(top);
+        vertices->push_back(bottom);
+        top+=dv;
+        bottom+=dv;
+
+        texcoords->push_back(top_texcoord);
+        texcoords->push_back(bottom_texcoord);
+        top_texcoord+=dv_texcoord;
+        bottom_texcoord+=dv_texcoord;
+    }
+    
+
+    // pass the created vertex array to the points geometry object.
+    polyGeom->setVertexArray(vertices);
+    
+    polyGeom->setTexCoordArray(0,texcoords);
+
+    osg::Vec4Array* colors = new osg::Vec4Array;
+    colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
+    polyGeom->setColorArray(colors);
+    polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
+
+    polyGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,vertices->size()));
+
+    // new we need to add the texture to the Drawable, we do so by creating a 
+    // StateSet to contain the Texture StateAttribute.
+    osg::StateSet* stateset = new osg::StateSet;
+
+    // set up the texture.
+//    osg::Image* image = new osg::Image;
+//    image->setInternalTextureFormat(GL_RGBA);
+
+    // Dynamic texture filled with data from pbuffer.
+    osg::Texture2D* texture = new osg::Texture2D;
+    //texture->setSubloadMode(osg::Texture::IF_DIRTY);
+    texture->setInternalFormat(GL_RGB);
+    texture->setTextureSize(512,512);
+    texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
+    texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
+texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP);
+texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP);
+    texture->setSubloadCallback(new MyTextureSubloadCallback());
+    stateset->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
+
+    polyGeom->setStateSet(stateset);
+
+    polyGeom->setAppCallback(new MyGeometryCallback(origin,xAxis,yAxis,zAxis,1.0,1.0/width,0.2f));
+
+    osg::Geode* geode = osgNew osg::Geode();
+    geode->addDrawable(polyGeom);
+
+    osg::Group* parent = new osg::Group;
+    
+    parent->setAppCallback(new MyAppCallback(subgraph));
+    
+    parent->setCullCallback(new MyCullCallback(subgraph,texture));
+ 
+    parent->addChild(geode);
+    
+    return parent;
+}
+
+void write_usage(std::ostream& out,const std::string& name)
+{
+    out << std::endl;
+    out <<"usage:"<< std::endl;
+    out <<"    "<<name<<" [options] infile1 [infile2 ...]"<< std::endl;
+    out << std::endl;
+    out <<"options:"<< std::endl;
+    out <<"    -l libraryName      - load plugin of name libraryName"<< std::endl;
+    out <<"                          i.e. -l osgdb_pfb"<< std::endl;
+    out <<"                          Useful for loading reader/writers which can load"<< std::endl;
+    out <<"                          other file formats in addition to its extension."<< std::endl;
+    out <<"    -e extensionName    - load reader/wrter plugin for file extension"<< std::endl;
+    out <<"                          i.e. -e pfb"<< std::endl;
+    out <<"                          Useful short hand for specifying full library name as"<< std::endl;
+    out <<"                          done with -l above, as it automatically expands to"<< std::endl;
+    out <<"                          the full library name appropriate for each platform."<< std::endl;
+    out <<std::endl;
+    out <<"    -stereo             - switch on stereo rendering, using the default of,"<< std::endl;
+    out <<"                          ANAGLYPHIC or the value set in the OSG_STEREO_MODE "<< std::endl;
+    out <<"                          environmental variable. See doc/stereo.html for "<< std::endl;
+    out <<"                          further details on setting up accurate stereo "<< std::endl;
+    out <<"                          for your system. "<< std::endl;
+    out <<"    -stereo ANAGLYPHIC  - switch on anaglyphic(red/cyan) stereo rendering."<< std::endl;
+    out <<"    -stereo QUAD_BUFFER - switch on quad buffered stereo rendering."<< std::endl;
+    out <<std::endl;
+    out <<"    -stencil            - use a visual with stencil buffer enabled, this "<< std::endl;
+    out <<"                          also allows the depth complexity statistics mode"<< std::endl;
+    out <<"                          to be used (press 'p' three times to cycle to it)."<< std::endl;
+    out << std::endl;
+}
+
+int main( int argc, char **argv )
+{
+
+    // initialize the GLUT
+    glutInit( &argc, argv );
+
+    if (argc<2)
+    {
+        write_usage(osg::notify(osg::NOTICE),argv[0]);
+        return 0;
+    }
+
+    // create the commandline args.
+    std::vector<std::string> commandLine;
+    for(int i=1;i<argc;++i) commandLine.push_back(argv[i]);
+    
+
+    // initialize the viewer.
+    osgGLUT::Viewer viewer;
+    viewer.setWindowTitle(argv[0]);
+    
+    // configure the viewer from the commandline arguments, and eat any
+    // parameters that have been matched.
+    viewer.readCommandLine(commandLine);
+    
+    // configure the plugin registry from the commandline arguments, and 
+    // eat any parameters that have been matched.
+    osgDB::readCommandLine(commandLine);
+    
+    // load the nodes from the commandline arguments.
+    osg::Node* loadedModel = osgDB::readNodeFiles(commandLine);
+    
+
+    if (!loadedModel)
+    {
+//        write_usage(osg::notify(osg::NOTICE),argv[0]);
+        return 1;
+    }
+    
+    // create a transform to spin the model.
+    osg::MatrixTransform* loadedModelTransform = new osg::MatrixTransform;
+    loadedModelTransform->addChild(loadedModel);
+
+    osg::NodeCallback* nc = new osgUtil::TransformCallback(loadedModelTransform->getBound().center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(45.0f));
+    loadedModelTransform->setAppCallback(nc);
+
+    osg::Group* rootNode = new osg::Group();
+//    rootNode->addChild(loadedModelTransform);
+    rootNode->addChild(createPreRenderSubGraph(loadedModelTransform));
+
+
+    // add model to the viewer.
+    viewer.addViewport( rootNode );
+
+
+    // register trackball, flight and drive.
+    viewer.registerCameraManipulator(new osgGA::TrackballManipulator);
+    viewer.registerCameraManipulator(new osgGA::FlightManipulator);
+    viewer.registerCameraManipulator(new osgGA::DriveManipulator);
+
+    viewer.open();
+
+    g_pPixelBuffer = new PBuffer(512,512);
+    g_pPixelBuffer->initialize();
+
+    viewer.run();
+
+    delete g_pPixelBuffer;
+
+    return 0;
+}
diff --git a/src/Demos/osgpbuffer/pbuffer.cpp b/src/Demos/osgpbuffer/pbuffer.cpp
new file mode 100644
index 000000000..fc2a5ddee
--- /dev/null
+++ b/src/Demos/osgpbuffer/pbuffer.cpp
@@ -0,0 +1,446 @@
+#include <cstdio>
+#include <set>
+#include <vector>
+#include <string>
+#include <cassert>
+
+#include <osg/GLExtensions>
+#include <osg/Notify>
+
+#include "pbuffer.h"
+
+namespace osg {
+    bool isWGLExtensionSupported(const char *extension);
+}
+
+
+// WGL_ARB_pbuffer
+static WGLCreatePBufferProc            wglCreatePBuffer;
+static WGLGetPBufferDCProc             wglGetPBufferDC;
+static WGLReleasePBufferDCProc         wglReleasePBufferDC;
+static WGLDestroyPBufferProc           wglDestroyPBuffer;
+static WGLQueryPBufferProc             wglQueryPBuffer;
+
+// WGL_ARB_pixel_format
+static WGLGetPixelFormatAttribivProc   wglGetPixelFormatAttribiv;
+static WGLGetPixelFormatAttribfvProc   wglGetPixelFormatAttribfv;
+static WGLChoosePixelFormatProc        wglChoosePixelFormat;
+
+// WGL_ARB_render_texture
+static WGLBindTexImageProc              wglBindTexImage;
+static WGLReleaseTexImageProc           wglReleaseTexImage;
+static WGLSetPbufferAttribProc          wglSetPbufferAttrib;
+
+
+#ifdef _WIN32
+
+#ifndef WGL_ARB_extensions_string
+#define WGL_ARB_extensions_string 1
+typedef const char * (WINAPI * WGLGetExtensionsStringProc) (HDC hDC);
+#endif
+
+#endif
+
+#ifdef _WIN32
+bool osg::isWGLExtensionSupported(const char *extension)
+{
+
+    typedef std::set<std::string>  ExtensionSet;
+    static ExtensionSet s_extensionSet;
+    static const char* s_extensions = NULL;
+    static WGLGetExtensionsStringProc wglGetExtensionsString = (WGLGetExtensionsStringProc)osg::getGLExtensionFuncPtr("wglGetExtensionsStringARB");
+    if (wglGetExtensionsString == NULL) return false;
+    if (s_extensions==NULL)
+    {
+        // get the extension list from OpenGL.
+        s_extensions = (const char*)wglGetExtensionsString(::wglGetCurrentDC());
+        if (s_extensions==NULL) return false;
+
+        // insert the ' ' delimiated extensions words into the extensionSet.
+        const char *startOfWord = s_extensions;
+        const char *endOfWord;
+        while ((endOfWord = strchr(startOfWord,' '))!=NULL)
+        {
+            s_extensionSet.insert(std::string(startOfWord,endOfWord));
+            startOfWord = endOfWord+1;
+        }
+        if (*startOfWord!=0) s_extensionSet.insert(std::string(startOfWord));
+        
+        osg::notify(osg::INFO)<<"OpenGL extensions supported by installed OpenGL drivers are:"<<std::endl;
+        for(ExtensionSet::iterator itr=s_extensionSet.begin();
+            itr!=s_extensionSet.end();
+            ++itr)
+        {
+            osg::notify(osg::INFO)<<"    "<<*itr<<std::endl;
+        }
+            
+    }
+
+    // true if extension found in extensionSet.
+    bool result = s_extensionSet.find(extension)!=s_extensionSet.end();
+
+    if (result)
+        osg::notify(osg::INFO)<<"OpenGL WGL extension '"<<extension<<"' is supported."<<std::endl;
+    else
+        osg::notify(osg::INFO)<<"OpenGL WGL extension '"<<extension<<"' is not supported."<<std::endl;
+
+    return result;
+}
+#endif
+
+
+PBuffer::PBuffer(const int width, const int height) :
+    _width(width),
+    _height(height),
+    _hDC(NULL),
+    _hGLcontext(NULL),
+    _hPBuffer(NULL)
+{
+    _doubleBuffer = false;
+    _RGB = true;
+    _shareLists = false;
+    _minimumNumberDepthBits = 16;
+    _minimumNumberAlphaBits = 8;
+    _minimumNumberStencilBits = 0;
+    _minimumNumberAccumulationBits = 0;
+}
+
+PBuffer::~PBuffer()
+{
+    if (_hPBuffer)
+    {
+        wglDeleteContext( _hGLcontext );
+        wglReleasePBufferDC( _hPBuffer, _hDC );
+        wglDestroyPBuffer( _hPBuffer );
+    }
+}
+
+// Check to see if the pbuffer was lost.
+// If it was lost, destroy it and then recreate it.
+void PBuffer::handleModeSwitch()
+{
+    int lost = 0;
+    wglQueryPBuffer( _hPBuffer, WGL_PBUFFER_LOST_ARB, &lost );
+
+    if ( lost )
+    {
+        this->~PBuffer();
+        initialize();
+    }
+}
+
+
+// This function actually does the creation of the p-buffer.
+// It can only be called once a window has already been created.
+void PBuffer::initialize()
+{
+    setupGLExtenions();
+
+    HDC hdc = wglGetCurrentDC();
+	HGLRC hglrc = wglGetCurrentContext();
+
+    // Query for a suitable pixel format based on the specified mode.
+    std::vector<int> iattributes;
+    std::vector<float> fattributes;
+
+    // P-buffer will be used with OpenGL
+    iattributes.push_back(WGL_SUPPORT_OPENGL_ARB);
+    iattributes.push_back(true);
+
+    // Since we are trying to create a pbuffer, the pixel format we
+    // request (and subsequently use) must be "p-buffer capable".
+    iattributes.push_back(WGL_DRAW_TO_PBUFFER_ARB);
+    iattributes.push_back(true);
+
+    // Bind to texture
+    iattributes.push_back(WGL_BIND_TO_TEXTURE_RGBA_ARB);
+    iattributes.push_back(true);
+
+//iattributes.push_back(WGL_ACCELERATION_ARB);
+//iattributes.push_back(WGL_FULL_ACCELERATION_ARB);
+
+    if (_RGB)
+    {
+        iattributes.push_back(WGL_PIXEL_TYPE_ARB);
+        iattributes.push_back(WGL_TYPE_RGBA_ARB);
+
+        // We require a minimum of 8-bits for each R, G, B, and A.
+        iattributes.push_back(WGL_RED_BITS_ARB);
+        iattributes.push_back(8);
+        iattributes.push_back(WGL_GREEN_BITS_ARB);
+        iattributes.push_back(8);
+        iattributes.push_back(WGL_BLUE_BITS_ARB);
+        iattributes.push_back(8);
+        if (_minimumNumberAlphaBits > 0)
+        {
+            iattributes.push_back(WGL_ALPHA_BITS_ARB);
+            iattributes.push_back(_minimumNumberAlphaBits);
+        }
+    }
+    else
+    {
+        iattributes.push_back(WGL_PIXEL_TYPE_ARB);
+        iattributes.push_back(WGL_TYPE_COLORINDEX_ARB);
+    }
+
+    iattributes.push_back(WGL_DOUBLE_BUFFER_ARB);
+    iattributes.push_back(_doubleBuffer);
+
+    if (_minimumNumberDepthBits > 0)
+    {
+        iattributes.push_back(WGL_DEPTH_BITS_ARB);
+        iattributes.push_back(_minimumNumberDepthBits);
+    }
+
+    if (_minimumNumberStencilBits > 0)
+    {
+        iattributes.push_back(WGL_STENCIL_BITS_ARB);
+        iattributes.push_back(_minimumNumberStencilBits);
+    }
+
+    if (_minimumNumberAccumulationBits > 0)
+    {
+        iattributes.push_back(WGL_ACCUM_BITS_ARB);
+        iattributes.push_back(_minimumNumberAccumulationBits);
+    }
+
+    // Terminate array
+    iattributes.push_back(0);
+
+
+    // Now obtain a list of pixel formats that meet these minimum requirements.
+    int format;
+    int pformat[MAX_PFORMATS];
+    unsigned int nformats=0;
+    if ( !wglChoosePixelFormat( hdc, &iattributes.front(), &fattributes.front(), MAX_PFORMATS, pformat, &nformats ) )
+    {
+        osg::notify(osg::FATAL)<< "pbuffer creation error:  Couldn't find a suitable pixel format." <<std::endl;
+        exit( -1 );
+    }
+	format = pformat[0];
+
+
+    // Create the p-buffer.
+    std::vector<int> pbattr;
+
+    // Texture format
+    pbattr.push_back(WGL_TEXTURE_FORMAT_ARB);
+    pbattr.push_back(WGL_TEXTURE_RGBA_ARB);
+#if 1
+    // Texture target
+    pbattr.push_back(WGL_TEXTURE_TARGET_ARB);
+    pbattr.push_back(WGL_TEXTURE_2D_ARB);
+#else
+    // Cubemap
+    pbattr.push_back(WGL_TEXTURE_TARGET_ARB);
+    pbattr.push_back(WGL_TEXTURE_CUBE_MAP_ARB);
+
+    // Cubemap face
+    pbattr.push_back(WGL_CUBE_MAP_FACE_ARB);
+    pbattr.push_back(WGL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB);
+#endif
+    // Terminate array
+    pbattr.push_back(0);
+
+    iattributes[0] = 0;
+    _hPBuffer = wglCreatePBuffer( hdc, format, _width, _height, &pbattr.front() );
+    if ( !_hPBuffer )
+    {
+        DWORD err = GetLastError();
+        osg::notify(osg::FATAL)<< "pbuffer creation error:  wglCreatePBufferARB() failed\n" <<std::endl;
+        switch (err)
+        {
+        case ERROR_INVALID_PIXEL_FORMAT:
+            osg::notify(osg::FATAL)<< "error:  ERROR_INVALID_PIXEL_FORMAT\n" <<std::endl;
+            break;
+        case ERROR_NO_SYSTEM_RESOURCES:
+            osg::notify(osg::FATAL)<< "error:  ERROR_NO_SYSTEM_RESOURCES\n" <<std::endl;
+            break;
+        case ERROR_INVALID_DATA:
+            osg::notify(osg::FATAL)<< "error:  ERROR_INVALID_DATA\n" <<std::endl;
+            break;
+        }
+        exit( -1 );
+    }
+
+    // Get the device context.
+    _hDC = wglGetPBufferDC( _hPBuffer );
+    if ( !_hDC )
+    {
+        osg::notify(osg::FATAL)<< "pbuffer creation error:  wglGetPBufferDC() failed\n" << std::endl;
+        exit( -1 );
+    }
+
+    // Create a gl context for the p-buffer.
+    _hGLcontext = wglCreateContext( _hDC );
+    if ( !_hGLcontext )
+    {
+        osg::notify(osg::FATAL)<< "pbuffer creation error:  wglCreateContext() failed\n" << std::endl;
+        exit( -1 );
+    }
+
+	if( _shareLists )
+    {
+        if( !wglShareLists(hglrc, _hGLcontext) )
+        {
+            osg::notify(osg::FATAL)<< "pbuffer: wglShareLists() failed\n" << std::endl;
+            exit( -1 );
+        }
+    }
+
+    // Determine the actual width and height we were able to create.
+    wglQueryPBuffer( _hPBuffer, WGL_PBUFFER_WIDTH_ARB, &_width );
+    wglQueryPBuffer( _hPBuffer, WGL_PBUFFER_HEIGHT_ARB, &_height );
+
+    osg::notify(osg::INFO)<< "PBuffer created " << _width << " x " << _height << "pbuffer."<< std::endl;
+}
+
+
+void PBuffer::releaseTexImage()
+{
+    if(!wglReleaseTexImage( _hPBuffer, WGL_FRONT_LEFT_ARB ) )
+    {
+        assert(0);
+    }
+}
+
+
+void PBuffer::makeCurrent()
+{
+    if ( !wglMakeCurrent( _hDC, _hGLcontext ) )
+    {
+        osg::notify(osg::FATAL)<< "PBuffer::makeCurrent() failed.\n"<< std::endl;
+        exit( -1 );
+    }
+}
+
+
+void PBuffer::bindTexImage(GLuint textureID)
+{
+	glBindTexture(GL_TEXTURE_2D, textureID);
+
+    if(!::wglBindTexImage(_hPBuffer, WGL_FRONT_LEFT_ARB))
+	{
+        assert(0);
+	}
+}
+
+
+void PBuffer::setupGLExtenions()
+{
+#ifdef _WIN32
+    _isPBufferSupported = osg::isWGLExtensionSupported("WGL_ARB_pbuffer");
+    if (_isPBufferSupported)
+    {
+        wglCreatePBuffer    = (WGLCreatePBufferProc)osg::getGLExtensionFuncPtr("wglCreatePbufferARB");
+        wglGetPBufferDC     = (WGLGetPBufferDCProc)osg::getGLExtensionFuncPtr("wglGetPbufferDCARB");
+        wglReleasePBufferDC = (WGLReleasePBufferDCProc)osg::getGLExtensionFuncPtr("wglReleasePbufferDCARB");
+        wglDestroyPBuffer   = (WGLDestroyPBufferProc)osg::getGLExtensionFuncPtr("wglDestroyPbufferARB");
+        wglQueryPBuffer     = (WGLQueryPBufferProc)osg::getGLExtensionFuncPtr("wglQueryPbufferARB");
+    }
+
+    _isPixelFormatSupported = osg::isWGLExtensionSupported("WGL_ARB_pixel_format");
+    if (_isPixelFormatSupported)
+    {
+        wglGetPixelFormatAttribiv = (WGLGetPixelFormatAttribivProc)osg::getGLExtensionFuncPtr("wglGetPixelFormatAttribivARB");
+        wglGetPixelFormatAttribfv = (WGLGetPixelFormatAttribfvProc)osg::getGLExtensionFuncPtr("wglGetPixelFormatAttribfvARB");
+        wglChoosePixelFormat      = (WGLChoosePixelFormatProc)osg::getGLExtensionFuncPtr("wglChoosePixelFormatARB");
+    }
+
+    _isRenderTextureSupported = osg::isWGLExtensionSupported("WGL_ARB_render_texture");
+    if (_isRenderTextureSupported)
+    {
+		wglBindTexImage     = (WGLBindTexImageProc)osg::getGLExtensionFuncPtr("wglBindTexImageARB");
+		wglReleaseTexImage  = (WGLReleaseTexImageProc)osg::getGLExtensionFuncPtr("wglReleaseTexImageARB");
+		wglSetPbufferAttrib = (WGLSetPbufferAttribProc)osg::getGLExtensionFuncPtr("wglSetPbufferAttribARB");
+    }
+#endif
+}
+
+
+#if DEBUGGING
+    fprintf( fp, "nformats = %d\n\n", nformats );
+    int values[MAX_ATTRIBS];
+	int iatr[MAX_ATTRIBS] = { WGL_PIXEL_TYPE_ARB, WGL_COLOR_BITS_ARB,
+		                      WGL_RED_BITS_ARB, WGL_GREEN_BITS_ARB, WGL_BLUE_BITS_ARB,
+							  WGL_ALPHA_BITS_ARB, WGL_DEPTH_BITS_ARB, WGL_STENCIL_BITS_ARB, WGL_ACCUM_BITS_ARB,
+							  WGL_DOUBLE_BUFFER_ARB, WGL_SUPPORT_OPENGL_ARB, WGL_ACCELERATION_ARB };
+	int niatr = 12;
+    for ( int j = 0; j < MAX_ATTRIBS; j++ )
+        {
+        values[j] = false;
+        iattributes[j] = iattributes[2*j];
+        }
+    for ( unsigned int i = 0; i < nformats; i++ )
+        {
+        if ( !wglGetPixelFormatAttribivARB( hdc, pformat[i], 0, niatr, iatr, values ) )
+            {
+            fprintf( stderr, "pbuffer creation error:  wglGetPixelFormatAttribiv() failed\n" );
+            exit( -1 );
+            }
+		fprintf( fp, "%d. pformat = %d\n", i, pformat[i] );
+		fprintf( fp, "--------------------\n" );
+        for ( int k = 0; k < niatr; k++ )
+            {
+            if ( iatr[k] == WGL_PIXEL_TYPE_ARB )
+                {
+                if ( values[k] == WGL_TYPE_COLORINDEX_ARB )
+                    fprintf( fp, " Pixel type = WGL_TYPE_COLORINDEX_ARB\n" );
+                if ( values[k] == WGL_TYPE_RGBA_ARB )
+                    fprintf( fp, " Pixel type = WGL_TYPE_RGBA_ARB\n" );
+                }
+            if ( iatr[k] == WGL_COLOR_BITS_ARB )
+                {
+                fprintf( fp, " Color bits = %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_RED_BITS_ARB )
+                {
+                fprintf( fp, "      red         %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_GREEN_BITS_ARB )
+                {
+                fprintf( fp, "      green       %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_BLUE_BITS_ARB )
+                {
+                fprintf( fp, "      blue        %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_ALPHA_BITS_ARB )
+                {
+                fprintf( fp, "      alpha       %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_DEPTH_BITS_ARB )
+                {
+                fprintf( fp, " Depth bits =   %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_STENCIL_BITS_ARB )
+                {
+                fprintf( fp, " Stencil bits = %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_ACCUM_BITS_ARB )
+                {
+                fprintf( fp, " Accum bits =   %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_DOUBLE_BUFFER_ARB )
+                {
+                fprintf( fp, " Double Buffer  = %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_SUPPORT_OPENGL_ARB )
+                {
+                fprintf( fp, " Support OpenGL = %d\n", values[k] );
+                }
+            if ( iatr[k] == WGL_ACCELERATION_ARB )
+                {
+				if ( values[k] == WGL_FULL_ACCELERATION_ARB )
+					fprintf( fp, " Acceleration   = WGL_FULL_ACCELERATION_ARB\n" );
+				if ( values[k] == WGL_GENERIC_ACCELERATION_ARB )
+					fprintf( fp, " Acceleration   = WGL_GENERIC_ACCELERATION_ARB\n" );
+                }
+            }
+        fprintf( fp, "\n" );
+        }
+    fprintf( fp, "selected pformat = %d\n", format );
+#endif
+
+
+
diff --git a/src/Demos/osgpbuffer/pbuffer.h b/src/Demos/osgpbuffer/pbuffer.h
new file mode 100644
index 000000000..7db02e9f5
--- /dev/null
+++ b/src/Demos/osgpbuffer/pbuffer.h
@@ -0,0 +1,201 @@
+#ifndef PBUFFERS_H
+#define PBUFFERS_H
+/*
+#include <windows.h>
+#include "GL/gl.h"
+#include <GL/glut.h>
+#include "GL/wglext.h"
+#include <GL/glext.h>
+*/
+
+#include <osg/GL>
+
+#if defined(WIN32)
+    #define WIN32_LEAN_AND_MEAN
+    #include <windows.h>
+#endif
+
+
+#ifndef WGL_ARB_pbuffer
+#define WGL_NUMBER_PIXEL_FORMATS_ARB        0x2000
+#define WGL_DRAW_TO_WINDOW_ARB              0x2001
+#define WGL_DRAW_TO_BITMAP_ARB              0x2002
+#define WGL_ACCELERATION_ARB                0x2003
+#define WGL_NEED_PALETTE_ARB                0x2004
+#define WGL_NEED_SYSTEM_PALETTE_ARB         0x2005
+#define WGL_SWAP_LAYER_BUFFERS_ARB          0x2006
+#define WGL_SWAP_METHOD_ARB                 0x2007
+#define WGL_NUMBER_OVERLAYS_ARB             0x2008
+#define WGL_NUMBER_UNDERLAYS_ARB            0x2009
+#define WGL_TRANSPARENT_ARB                 0x200A
+#define WGL_TRANSPARENT_RED_VALUE_ARB       0x2037
+#define WGL_TRANSPARENT_GREEN_VALUE_ARB     0x2038
+#define WGL_TRANSPARENT_BLUE_VALUE_ARB      0x2039
+#define WGL_TRANSPARENT_ALPHA_VALUE_ARB     0x203A
+#define WGL_TRANSPARENT_INDEX_VALUE_ARB     0x203B
+#define WGL_SHARE_DEPTH_ARB                 0x200C
+#define WGL_SHARE_STENCIL_ARB               0x200D
+#define WGL_SHARE_ACCUM_ARB                 0x200E
+#define WGL_SUPPORT_GDI_ARB                 0x200F
+#define WGL_SUPPORT_OPENGL_ARB              0x2010
+#define WGL_DOUBLE_BUFFER_ARB               0x2011
+#define WGL_STEREO_ARB                      0x2012
+#define WGL_PIXEL_TYPE_ARB                  0x2013
+#define WGL_COLOR_BITS_ARB                  0x2014
+#define WGL_RED_BITS_ARB                    0x2015
+#define WGL_RED_SHIFT_ARB                   0x2016
+#define WGL_GREEN_BITS_ARB                  0x2017
+#define WGL_GREEN_SHIFT_ARB                 0x2018
+#define WGL_BLUE_BITS_ARB                   0x2019
+#define WGL_BLUE_SHIFT_ARB                  0x201A
+#define WGL_ALPHA_BITS_ARB                  0x201B
+#define WGL_ALPHA_SHIFT_ARB                 0x201C
+#define WGL_ACCUM_BITS_ARB                  0x201D
+#define WGL_ACCUM_RED_BITS_ARB              0x201E
+#define WGL_ACCUM_GREEN_BITS_ARB            0x201F
+#define WGL_ACCUM_BLUE_BITS_ARB             0x2020
+#define WGL_ACCUM_ALPHA_BITS_ARB            0x2021
+#define WGL_DEPTH_BITS_ARB                  0x2022
+#define WGL_STENCIL_BITS_ARB                0x2023
+#define WGL_AUX_BUFFERS_ARB                 0x2024
+#define WGL_NO_ACCELERATION_ARB             0x2025
+#define WGL_GENERIC_ACCELERATION_ARB        0x2026
+#define WGL_FULL_ACCELERATION_ARB           0x2027
+#define WGL_SWAP_EXCHANGE_ARB               0x2028
+#define WGL_SWAP_COPY_ARB                   0x2029
+#define WGL_SWAP_UNDEFINED_ARB              0x202A
+#define WGL_TYPE_RGBA_ARB                   0x202B
+#define WGL_TYPE_COLORINDEX_ARB             0x202C
+#define WGL_DRAW_TO_PBUFFER_ARB             0x202D
+#define WGL_MAX_PBUFFER_PIXELS_ARB          0x202E
+#define WGL_MAX_PBUFFER_WIDTH_ARB           0x202F
+#define WGL_MAX_PBUFFER_HEIGHT_ARB          0x2030
+#define WGL_PBUFFER_LARGEST_ARB             0x2033
+#define WGL_PBUFFER_WIDTH_ARB               0x2034
+#define WGL_PBUFFER_HEIGHT_ARB              0x2035
+#define WGL_PBUFFER_LOST_ARB				0x2036
+#endif
+
+
+#ifndef WGL_ARB_pbuffer
+#define WGL_ARB_pbuffer 1
+
+DECLARE_HANDLE(HPBUFFERARB);
+
+typedef HPBUFFERARB (WINAPI * WGLCreatePBufferProc) (
+                                        HDC hDC,
+                                        int iPixelFormat,
+                                        int iWidth,
+                                        int iHeight,
+                                        const int *piAttribList);
+typedef HDC (WINAPI * WGLGetPBufferDCProc) (HPBUFFERARB hPbuffer);
+typedef int (WINAPI * WGLReleasePBufferDCProc) (
+                                        HPBUFFERARB hPbuffer,
+                                        HDC hDC);
+typedef BOOL (WINAPI * WGLDestroyPBufferProc) (HPBUFFERARB hPbuffer);
+typedef BOOL (WINAPI * WGLQueryPBufferProc) (
+                                        HPBUFFERARB hPbuffer,
+                                        int iAttribute,
+                                        int *piValue);
+#endif
+
+
+#ifndef WGL_ARB_pixel_format
+#define WGL_ARB_pixel_format 1
+typedef BOOL (WINAPI * WGLGetPixelFormatAttribivProc) (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, const int *piAttributes, int *piValues);
+typedef BOOL (WINAPI * WGLGetPixelFormatAttribfvProc) (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, const int *piAttributes, FLOAT *pfValues);
+typedef BOOL (WINAPI * WGLChoosePixelFormatProc) (HDC hdc, const int *piAttribIList, const FLOAT *pfAttribFList, UINT nMaxFormats, int *piFormats, UINT *nNumFormats);
+#endif
+
+
+
+#ifndef WGL_ARB_render_texture
+#define WGL_BIND_TO_TEXTURE_RGB_ARB             0x2070
+#define WGL_BIND_TO_TEXTURE_RGBA_ARB            0x2071
+#define WGL_TEXTURE_FORMAT_ARB                  0x2072
+#define WGL_TEXTURE_TARGET_ARB                  0x2073
+#define WGL_MIPMAP_TEXTURE_ARB                  0x2074
+#define WGL_TEXTURE_RGB_ARB                     0x2075
+#define WGL_TEXTURE_RGBA_ARB                    0x2076
+#define WGL_NO_TEXTURE_ARB                      0x2077
+#define WGL_TEXTURE_CUBE_MAP_ARB                0x2078
+#define WGL_TEXTURE_1D_ARB                      0x2079
+#define WGL_TEXTURE_2D_ARB                      0x207A
+#define WGL_NO_TEXTURE_ARB                      0x2077
+#define WGL_MIPMAP_LEVEL_ARB                    0x207B
+#define WGL_CUBE_MAP_FACE_ARB                   0x207C
+#define WGL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB     0x207D
+#define WGL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB     0x207E
+#define WGL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB     0x207F
+#define WGL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB     0x2080
+#define WGL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB     0x2081 
+#define WGL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB     0x2082
+#define WGL_FRONT_LEFT_ARB                      0x2083
+#define WGL_FRONT_RIGHT_ARB                     0x2084
+#define WGL_BACK_LEFT_ARB                       0x2085
+#define WGL_BACK_RIGHT_ARB                      0x2086
+#define WGL_AUX0_ARB                            0x2087 
+#define WGL_AUX1_ARB                            0x2088 
+#define WGL_AUX2_ARB                            0x2089 
+#define WGL_AUX3_ARB                            0x208A 
+#define WGL_AUX4_ARB                            0x208B 
+#define WGL_AUX5_ARB                            0x208C 
+#define WGL_AUX6_ARB                            0x208D
+#define WGL_AUX7_ARB                            0x208E 
+#define WGL_AUX8_ARB                            0x208F 
+#define WGL_AUX9_ARB                            0x2090
+#endif
+
+#ifndef WGL_ARB_render_texture
+#define WGL_ARB_render_texture 1
+typedef BOOL (WINAPI * WGLBindTexImageProc) (HPBUFFERARB hPbuffer, int iBuffer);
+typedef BOOL (WINAPI * WGLReleaseTexImageProc) (HPBUFFERARB hPbuffer, int iBuffer);
+typedef BOOL (WINAPI * WGLSetPbufferAttribProc) (HPBUFFERARB hPbuffer, const int * piAttribList);
+#endif
+
+
+#define MAX_PFORMATS 256
+#define MAX_ATTRIBS  32
+
+
+
+class PBuffer
+{
+    private:
+
+        HDC             _hDC;           // Handle to a device context.
+        HGLRC           _hGLcontext;    // Handle to a GL context.
+        HPBUFFERARB     _hPBuffer;      // Handle to a pbuffer.
+        int             _width;
+        int             _height;
+
+        bool            _doubleBuffer;
+        bool            _RGB;
+        bool            _shareLists;
+        unsigned int    _minimumNumberDepthBits;
+        unsigned int    _minimumNumberAlphaBits;
+        unsigned int    _minimumNumberStencilBits;
+        unsigned int    _minimumNumberAccumulationBits;
+
+        bool            _isPBufferSupported;
+        bool            _isPixelFormatSupported;
+        bool            _isRenderTextureSupported;
+
+    public:
+
+        PBuffer(const int width, const int height );
+        ~PBuffer();
+        void handleModeSwitch();
+        void makeCurrent();
+        void initialize();
+        void bindTexImage(GLuint textureID);
+        void releaseTexImage();
+
+
+    protected:
+
+        void setupGLExtenions();
+
+};
+
+#endif
\ No newline at end of file