Implementated experimental reuse of PBO's after download

include/osg/BufferObject

@@ -528,6 +528,14 @@ class OSG_EXPORT BufferObject : public Object
         BufferObjectProfile& getProfile() { return _profile; }
         const BufferObjectProfile& getProfile() const { return _profile; }
 
+
+        /** Set whether the BufferObject should use a GLBufferObject just for copying the BufferData and release it immmediately so that it may be reused.*/
+        void setCopyDataAndReleaseGLBufferObject(bool copyAndRelease) { _copyDataAndReleaseGLBufferObject = copyAndRelease; }
+
+        /** Get whether the BufferObject should use a GLBufferObject just for copying the BufferData and release it immmediately.*/
+        bool getCopyDataAndReleaseGLBufferObject() const { return _copyDataAndReleaseGLBufferObject; }
+
+
         void dirty();
 
         /** Resize any per context GLObject buffers to specified size. */
@@ -572,6 +580,8 @@ class OSG_EXPORT BufferObject : public Object
 
         BufferObjectProfile     _profile;
 
+        bool                    _copyDataAndReleaseGLBufferObject;
+
         BufferDataList          _bufferDataList;
 
         mutable GLBufferObjects _glBufferObjects;

include/osgUtil/IncrementalCompileOperation

@@ -39,6 +39,7 @@ class OSGUTIL_EXPORT StateToCompile : public osg::NodeVisitor
         TextureSet  _textures;
         ProgramSet  _programs;
         bool        _assignPBOToImages;
+        osg::ref_ptr<osg::PixelBufferObject> _pbo;
 
         bool empty() const { return _textures.empty() &&  _programs.empty() && _drawables.empty(); }
 
@@ -48,6 +49,7 @@ class OSGUTIL_EXPORT StateToCompile : public osg::NodeVisitor
         virtual void apply(osg::Drawable& drawable);
         virtual void apply(osg::StateSet& stateset);
         virtual void apply(osg::Texture& texture);
+
 };
 
 class OSGUTIL_EXPORT IncrementalCompileOperation : public osg::GraphicsOperation