DtGlVaoManager.h

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


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvCore/DtVirtualBaseClassCreator.h>

#include <vrvUtil/DtSignalConnectionManager.h>


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

#include <map>
#include <tuple>

namespace makVrv
{
   // Forward declarations.
   class DtWindow;
   class DtDe;


   class DtGlVaoManager;

   typedef DtVirtualBaseClassCreator<DtGlVaoManager> DtGlVaoManagerCreator;

   template <>
   inline const char* creatorTypeName<DtGlVaoManager>(void) { return "DtGlVaoManagerCreator"; }


   // This will only contain the correct context if tracking has been set to true
   typedef std::tuple<unsigned int, void*> DtGlVaoAndContext;

   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 DtGlVaoAndContext getOrCreateVao(const osg::GraphicsContext* graphicsContext, bool& created) const;

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

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


   protected:

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

      virtual void slot_windowToBeDestroyed(DtWindow* window);

      virtual void attemptToDeleteVao(const void* glContext, DtGlVaoAndContext& fbo) const;

   protected:

      DtDe& myDe;
      DtSignalConnectionManager myConnections;

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

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

   };
}