DtOsgFrameTextureBlitterManager.h

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


#pragma once

#include <vrvOsg/DtOsgShaderManager.h>

#include <vrvGraphicsUtils/DtLight.h>

#include <vrvUtil/DtSignalConnectionManager.h>

#include <osg/observer_ptr>
#include <osg/Node>
#include <osg/Light>

#include <matrix/vlVector.h>

#include <boost/unordered_map.hpp>

namespace osg
{
   class Light;
   class LightSource;
   class State;
   class StateSet;
   class Matrixd;
}

namespace makVrv
{
   class DtGlRenderTexture;

   class DtGlDeleteObjectManager;

   class DtChannelManager;
   class DtChannel;

   class DT_DLL_VRVOSG DtOsgFrameTextureBlitterManager : public DtVirtualBaseClass
   {
   public:
      virtual ~DtOsgFrameTextureBlitterManager();
      
      virtual void releaseGLObjects();

      virtual DtGlRenderTexture* updateAndGetDepthTexture(osg::RenderInfo& renderInfo);

      virtual DtGlRenderTexture* findDepthTexture(osg::RenderInfo& renderInfo);

      virtual void slot_channelDestroyed(DtChannelManager* channelManager, DtChannel* channel);

      // by this manager. This manager is responsible for those textures.
      // This is called in the slot_channelDestroyed signal and also when
      // a window is about to be destroyed.
      virtual void deleteRenderTextureForCamera(const osg::Camera* camera);

      static DtOsgFrameTextureBlitterManager& instance(DtDe& de);

      static const std::string& theClassName();

   protected:
      DtOsgFrameTextureBlitterManager(DtDe& de);

      DtOsgFrameTextureBlitterManager();

      virtual void flushInvalidCameras(void);

   protected:
      DtDe& myDe;

      DtGlDeleteObjectManager& myGlDeleteObjectManager;

      struct TextureAndFrame
      {
         TextureAndFrame();
         virtual ~TextureAndFrame();
         DtGlRenderTexture* myTexture;
         int myFrameNumber;
      };

      typedef std::map<osg::observer_ptr<const osg::Camera>, TextureAndFrame> CameraToRenderTextureMap;
      mutable CameraToRenderTextureMap myDepthRenderTextureMap;

      // For listening for channel creation
      DtSignalConnectionManager myConnections;
   };
}