DtOsgShaderFilesCache.h

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/******************************************************************************
** Copyright (c) 2017 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/

#pragma once

#include <vrvOsg/vrvOsg.h>
#include <vrvUtil/DtVirtualBaseClass.h>

#include <vrvGraphicsUtils/DtCommonTypes.h>

#include <osg/Referenced>

#include <boost/thread.hpp>

namespace makVrv
{
   template<class T>
   class DtVirtualBaseClassCreator;


   class DT_DLL_VRVOSG DtOsgShaderFilesCache : public DtVirtualBaseClass
   {
   public:

      static DtOsgShaderFilesCache& instance(DtDe& de);

      virtual ~DtOsgShaderFilesCache();

      const std::string& loadShaderSource(const std::string& strFileName) const;
   private:

      mutable MapStringToString shaderFilesCache;
      OpenThreads::Mutex shaderFilesCacheMutex;

      DtOsgShaderFilesCache(DtDe& de);
      friend class DtVirtualBaseClassCreator<DtOsgShaderFilesCache>;

      DtDe& myDe;

      void PreReloadShaders(void);
      void PostReloadShaders(void);

      static const std::string s_cEmptyString;
      mutable boost::mutex  myMutex;
   };
}