pagedLodTerrainSourcePager.h

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/*******************************************************************************
** Copyright (c) 2021 MAK Technologies, Inc.
** All rights reserved.
*******************************************************************************/

#pragma once



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

#include <set>

class DT_DLL_vantageTerrainImplementation DtPagedLodTerrainSourcePager
   : public DtBoundingVolumeTerrainSourcePager
{
public:

   DtPagedLodTerrainSourcePager(
      DtVantageTerrainEngine* terrainEngine,
      osg::Group* rootNode,
      const DtFilename& surfaceCharacterMap);

   //DtPagedLodTerrainSourcePager(

   virtual ~DtPagedLodTerrainSourcePager();

   virtual DtTerrainSourceTracker* createTerrainSourceTracker(DtVantageTerrainEngine*);

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

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

   virtual void updatePageTracker(DtTerrainIntersectIDType intersectId = 0);

   virtual const NodePagingRecordMap& pagedInNodes() const;

   static DtTerrainSourcePager* terrainChooserFunction(
      osg::Node& node,
      DtVantageTerrainEngine* terrainEngine,
      const DtFilename& surfaceCharacterMap);

protected:
   osg::Node* terrainRoot();

   virtual bool pageInData(
      DtPageInVisitor& visitor,
      DtTerrainIntersectIDType intersectId = 0);

protected:
   class DtActivePageVisitor : public DtBoundingVolumeActivePageVisitor
   {
   public:
      using DtBoundingVolumeActivePageVisitor::apply;

      explicit DtActivePageVisitor(
         const NodePagingRecordMap&, DtTerrainIntersectIDType intersectId = 0);

      virtual void apply(osg::Group& node);
      virtual void apply(osg::LOD& node);
      virtual void apply(osg::PagedLOD& node);

   private:
      const NodePagingRecordMap& myPagedInNodes;
   };

   osg::ref_ptr<osg::Node> myRootNode;
   osg::Matrix myMatrix;

   NodePagingRecordMap myPagedInNodes;

   DtFilename mySurfaceCharacterMap;

};