DtGlVaoManager.h

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/******************************************************************************
** Copyright (c) 2020 VT-MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvCore/DtDe.h>

#include <vrvUtil/DtSignalConnectionManager.h>

#include <boost/unordered_map.hpp>

#include <osg/GraphicsContext>
#include <osg/State>


namespace makVrv
{
   // Forward declarations.
   class DtWindow;


   class DT_DLL_VRVOSG DtGlVaoManager
   {
   public:

      DtGlVaoManager(makVrv::DtDe& de);

      virtual ~DtGlVaoManager();

   private:

      DtGlVaoManager();

      DtGlVaoManager(const DtGlVaoManager &other);

      DtGlVaoManager &operator=(const DtGlVaoManager &other);

   public:
      virtual GLuint getOrCreateVao(osg::State* state, bool& created) const;

      virtual void clearVao(osg::GraphicsContext* graphicsContext) const;

      virtual void deleteQueuedVaos(osg::GraphicsContext* graphicsContext) const;

   protected:

      virtual void deleteQueuedVaosInAllGc(osg::GraphicsContext* graphicsContext) const;

      virtual void slot_windowToBeDestroyed(DtWindow* window);

   protected:

      DtDe& myDe;
      DtSignalConnectionManager myConnections;

      typedef std::map<osg::observer_ptr<const osg::GraphicsContext>, GLuint> MapContextToVao;
      mutable MapContextToVao myMutableGraphicsContextToVao;

      typedef std::vector<GLuint> VaoArray;
      typedef std::map<osg::observer_ptr<const osg::GraphicsContext>, VaoArray > MapContextsToVaoArray;
      mutable MapContextsToVaoArray myMutableGraphicsContextToVaoArrayToDelete;
   };


   class DT_DLL_VRVOSG DtGlVaoManagerCreator : public DtVirtualBaseClass
   {
   public:
      DtGlVaoManagerCreator(DtDe &de);

      virtual ~DtGlVaoManagerCreator();

   private:
      DtGlVaoManagerCreator(const DtGlVaoManagerCreator& other);
      DtGlVaoManagerCreator &operator=(const DtGlVaoManagerCreator& other);

   public:
      virtual DtGlVaoManager* create() const;

      static DtGlVaoManagerCreator& instance(DtDe& de);

      static const std::string& theClassName();

   protected:
      DtDe& myDe;
   };
}