DtReadFramebufferCallback.h

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// ******************************************************************************
// ** Copyright (c) 2012 MAK Technologies, Inc.
// ** All rights reserved.
// ******************************************************************************


#pragma once
#include <vrvVideoStream/vrvVideoStream.h>

#include <vrvVideoStream/DtVideoStream.h>

#include <osg/Camera>

#include <vector>
#include <list>

#include <boost/signal.hpp>

namespace makVrv
{
   class DtProcessImageTask;
   class DtOsgChannel;

   class DT_DLL_VRVVIDEOSTREAM DtReadFramebufferCallback 
      : public osg::Camera::DrawCallback
   {
   public:
      friend class DtVideoStream;

      virtual ~DtReadFramebufferCallback();

      virtual void operator()(osg::RenderInfo& renderInfo) const;

   protected:

      DtReadFramebufferCallback( DtDe& de, DtVideoStream& stream, DtOsgChannel* channel );

      virtual bool init();

      virtual void setupPixelBufferObjects( int numBuffers );

      virtual bool createProcessImageTask( DtDe& de, const DtVideoStream& stream );

      virtual bool setPixelFormatFromString( const DtUnicode& pxfString );

      virtual bool setReadBufferFromString( const DtUnicode& rbString );

      virtual bool setDataTypeFromString( const DtUnicode& dtString );

   private:
      // Default CTOR (unimplemented)
      DtReadFramebufferCallback();

      // Copy CTOR (unimplemented)
      DtReadFramebufferCallback( const DtReadFramebufferCallback& rhs );

      // Assignment operator (unimplemented)
      DtReadFramebufferCallback& operator=( const DtReadFramebufferCallback& orig );

   protected:
      DtVideoStream& myStream;
      DtDe& myDe;
      DtOsgChannel* myChannel;

      double myFrequency;

      bool myUseReadPixels;
      int myWidth;
      int myHeight;
      int myX;
      int myY;

      GLenum myPixelFormat;
      GLenum myDataType;
      GLenum myReadBuffer;

      std::vector<unsigned int> myPbos;
      int myWriteIndex;
      int myReadIndex;
      osg::ref_ptr<osg::Image> myImage;
      DtProcessImageTask* myTask;

      osg::GLExtensions* myGlExtensions;
      bool myIsInitialized;
   };
}