DtTerrainPatchObjectForestManager.h

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/****************************************************************************** 
** Copyright (c) 2022 MAK Technologies, Inc. 
** All rights reserved. 
******************************************************************************/ 

#pragma once

#include <vrvSt/vrvSt.h>
#include <string>

#include <unordered_map>
#include <unordered_set>

#include <vrvCore/DtTreeRecord.h>
#include <vrvCore/DtTerrainPatchObject.h>

namespace osg
{
   class Node;
}

namespace osgEarth
{
   class Map;
   class MapNode;
   class Layer;
   class VisibleLayer;
}

namespace makVrv 
{ 
   class DtDe;
   class DtOsgTerrainPatchObject;
   class DtStreamedSpeedTreeForest;
   
   class DT_DLL_VRVST DtTerrainPatchObjectForestManager
   {
   public:
      DtTerrainPatchObjectForestManager(DtDe& de, 
         DtOsgTerrainPatchObject& patch);
      virtual ~DtTerrainPatchObjectForestManager();

      void onDataLoaded(const osgEarth::Layer* layer,
         const osg::Node* data);
      void onDataUnLoaded(const osgEarth::Layer* layer,
         const osg::Node* data);

      void onLayerVisibilityChanged(const osgEarth::VisibleLayer* layer);

      void onLayerLoaded(const osgEarth::MapNode* mapNode,
         osgEarth::Layer* layer);
      void onLayerUnLoaded(const osgEarth::MapNode* mapNode,
         const osgEarth::Layer* layer);

      void addSpeedTreesToForest(const std::string& forestName, const osg::Node*  group, const DtVectorTreeRecords& treeRecords);

      void removeTreesFromForest(const std::string& forestName, const osg::Node* dataNode);

   protected:
      DtStreamedSpeedTreeForest* createForest(const std::string& strName);
      bool hasForest(const std::string& strName);
      DtStreamedSpeedTreeForest* getForest(const std::string& strName);
      void destroyForest(const std::string& strName);
      size_t numForests(void) const;
      void  destroyAllForests(void);

   protected:
      static std::string getForestName(const osgEarth::Layer* layer);

   protected:
      typedef std::unordered_map<std::string, DtStreamedSpeedTreeForest*> 
         MapStreamedForests;
      MapStreamedForests myStreamedForests;

      DtOsgTerrainPatchObject& myPatch;

      DtDe& myDe;
   };
}