DtOsgShaderFilesCache.h

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/*****************************************************************************
 * Copyright (c) 2020 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
{
   class DT_DLL_VRVOSG DtOsgShaderFilesCache : public DtVirtualBaseClass
   {
   public:
      virtual ~DtOsgShaderFilesCache();

   protected:
      DtOsgShaderFilesCache(DtDe& de);
   private:
      // not allowed
      DtOsgShaderFilesCache() = delete;

      DtOsgShaderFilesCache(const DtOsgShaderFilesCache& rhs) = delete;

      DtOsgShaderFilesCache& operator=(const DtOsgShaderFilesCache& rhs) = delete;

   public:
      virtual const std::string& loadShaderSource(const std::string& strFileName, bool logWarning = true) const;

      virtual void PreReloadShaders(void);

      virtual void PostReloadShaders(void);

   public:
      static DtOsgShaderFilesCache& instance(DtDe& de);

   protected:
      static const std::string theEmptyString;

   protected:
      mutable MapStringToString myMutableShaderFilesCache;
      OpenThreads::Mutex myShaderFilesCacheMutex;
      
      DtDe& myDe;

      mutable boost::mutex  myMutex;
   };
}