DtOsgGraphMergeOperation.h

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/******************************************************************************
** Copyright (c) 2024 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvUtil/DtVirtualBaseClassCreator.h>

#include <osg/OperationThread>

#include <osgEarth/SceneGraphCallback>

#include <tbb/concurrent_priority_queue.h>

namespace makVrv
{
   class DtDe;


   class DtOsgGraphMergeOperation;

   template <>
   inline const char* creatorTypeName<makVrv::DtOsgGraphMergeOperation>( void )
   {
      return "DtOsgGraphMergeOperationCreator";
   }
   using DtOsgGraphMergeOperationCreator = DtVirtualBaseClassCreator<makVrv::DtOsgGraphMergeOperation>;

   class DT_DLL_VRVOSG DtOsgGraphMergeOperation : public osg::Operation
   {
   public:
      friend DtOsgGraphMergeOperationCreator;

      virtual ~DtOsgGraphMergeOperation();

      struct GroupsToBeMergedStruct
      {
         GroupsToBeMergedStruct()
            : myIoslatedGroup( nullptr )
            , myLiveParentGroup( nullptr )
            , myPriority( 0 )
         {

         };

         GroupsToBeMergedStruct(
            osg::ref_ptr<osg::Group> isolated,
            osg::ref_ptr<osg::Group> parentLive,
            int priority )
            : myIoslatedGroup( isolated )
            , myLiveParentGroup( parentLive )
            , myPriority( priority )
         {
         };

         bool operator<( const GroupsToBeMergedStruct& rhs ) const
         {
            return myPriority < rhs.myPriority;
         }

         osg::ref_ptr <osg::Group> myLiveParentGroup;
         osg::ref_ptr<osg::Group> myIoslatedGroup;
         int myPriority;
      };

   protected:
      DtOsgGraphMergeOperation( DtDe& de );

   public:
      DtOsgGraphMergeOperation() = delete;
      DtOsgGraphMergeOperation& operator=( const DtOsgGraphMergeOperation& rhs ) = delete;
      DtOsgGraphMergeOperation& operator=( const DtOsgGraphMergeOperation&& rhs ) = delete;
      DtOsgGraphMergeOperation( const DtOsgGraphMergeOperation& rhs ) = delete;
      DtOsgGraphMergeOperation( const DtOsgGraphMergeOperation&& rhs ) = delete;
   public:
      virtual void operator() ( osg::Object* obj ) override;

      virtual void addMergeOperation( osg::ref_ptr<osg::Group> isolated, osg::ref_ptr<osg::Group> parentLive, int priority );
   protected:
      DtDe& myDe;

      tbb::concurrent_priority_queue< GroupsToBeMergedStruct > myMergeOps;
   };
}