boundingVolumeTerrainSourcePager.h

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/*******************************************************************************
** Copyright (c) 2021 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() override;

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

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

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

};

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&, bool useMatrix = false);
      ScopedBound(DtBoundingVolumeActivePageVisitor& visitor, const osg::BoundingSphere&, bool useMatrix = false);
      ~ScopedBound();

   private:
      DtBoundingVolumeActivePageVisitor* myVisitor;
   };

   friend class ScopedBound;

   void pushBound(const osg::BoundingSphere&, bool useMatrix=false);
   void popBound();

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

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

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