DtIndirectVaoManager.h

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


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvCore/DtVirtualBaseClassCreator.h>

#include <osg/observer_ptr>

namespace osg
{
   class State;
   class Camera;
}

namespace makVrv
{
   class DtDe;
   class DtIndirectGeometry;
   class DtGlVaoManager;

   class DtIndirectVaoManager;

   typedef DtVirtualBaseClassCreator<DtIndirectVaoManager> DtIndirectVaoManagerCreator;

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

   class DtIndirectVaoManager
   {
   public:
      friend DtIndirectVaoManagerCreator;

      virtual ~DtIndirectVaoManager();
   protected:
      DtIndirectVaoManager(DtDe& de);

   private:
      DtIndirectVaoManager(const DtIndirectVaoManager&) = delete;
      DtIndirectVaoManager& operator=(const DtIndirectVaoManager&) = delete;
   public:
      virtual void initialize(const DtIndirectGeometry* indirectGeometry);

      virtual unsigned int getOrCreateAndRecordVAO(osg::State* state, const osg::Camera* camera);

      virtual void clearVAO(void);

      virtual void releaseGLObjects(osg::State* state);

      virtual void flushVaoManagers();

   protected:
      virtual void recordVAO(unsigned int vao, const osg::Camera* camera);

   protected:
      DtDe& myDe;
      const DtIndirectGeometry* myIndirectGeometry;

      // We need a gl manager per camera
      typedef std::map<osg::observer_ptr<const osg::Camera>, DtGlVaoManager*> CameraToVaoManagerMap;
      CameraToVaoManagerMap myMutableVaoManagers;
   };
}