boundingVolumeTerrainSourcePager.h

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/*******************************************************************************
** Copyright (c) 2011 MAK Technologies, Inc.
** All rights reserved.
*******************************************************************************/


#pragma once

#include <vantageTerrainImplementation/terrainPagerCommand.h>
#include <vantageTerrainImplementation/terrainSourcePager.h>
#include <vantageTerrainImplementation/pageInVisitor.h>
#include <vantageTerrainImplementation/boundingVolumeTerrainSourceTracker.h>
#include <terrainInterface/terrainPagingGeometry.h>

class DT_DLL_vantageTerrainImplementation DtBoundingVolumeTerrainSourcePager
   : public DtTerrainSourcePager
{
public:

   DtBoundingVolumeTerrainSourcePager(DtVantageTerrainEngine* terrainEngine);

   virtual ~DtBoundingVolumeTerrainSourcePager();

   virtual bool pageInGeometry(
      const DtTerrainPagingGeometryPtr geometry,
      DtTerrainIntersectIDType intersectId = 0) = 0;

   virtual bool pageOutNodes(std::list<DtNodeId>& nodesToRemove) = 0;

   virtual void updatePageTracker(DtTerrainIntersectIDType intersectId = 0) = 0;

protected:
   class DtBoundingVolumeActivePageVisitor : public DtMaintainMatrixVisitor
   {
   public:
      DtBoundingVolumeActivePageVisitor(DtTerrainIntersectIDType intersectId = 0);

      const DtNodeBoundingInfoList& pagedOutBoundingVolumes() const;
      const DtNodeBoundingInfoMap& pagedInBoundingVolumes() const;
      bool noValidAreas() const;

   protected:
      class ScopedBound
      {
      public:
         ScopedBound(DtBoundingVolumeActivePageVisitor& visitor, osg::Node&);
         ScopedBound(DtBoundingVolumeActivePageVisitor& visitor, const osg::BoundingSphere&);
         ~ScopedBound();

      private:
         DtBoundingVolumeActivePageVisitor* myVisitor;
      };

      friend class ScopedBound;

      void pushBound(const osg::BoundingSphere&);
      void popBound();

      bool addToPagedOutVolumesList(DtNodeBoundingInfoPtr pagedOutArea);
      bool addToPagedOutVolumesList(DtNodeBoundingInfo* pagedOutArea);

      void addToPagedInVolumesList(osg::Node*, DtNodeBoundingInfoPtr pagedOutArea);
      void addToPagedInVolumesList(osg::Node*, DtNodeBoundingInfo* pagedOutArea);

      DtNodeBoundingInfoList myPagedOutBoundingList;
      DtNodeBoundingInfoMap myPagedInBoundingMap;
      bool myNoValidAreas;
      std::stack<osg::BoundingSphere> myBoundingNodeStack;
      DtTerrainIntersectIDType myIntersectId;
   };

};