text: /***************************************************************************
   * Copyright 1998-2018 by authors (see AUTHORS.txt)                        *
   *                                                                         *
   *   This file is part of LuxCoreRender.                                   *
   *                                                                         *
   * Licensed under the Apache License, Version 2.0 (the "License");         *
   * you may not use this file except in compliance with the License.        *
   * You may obtain a copy of the License at                                 *
   *                                                                         *
   *     http://www.apache.org/licenses/LICENSE-2.0                          *
   *                                                                         *
   * Unless required by applicable law or agreed to in writing, software     *
   * distributed under the License is distributed on an "AS IS" BASIS,       *
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.*
   * See the License for the specific language governing permissions and     *
   * limitations under the License.                                          *
   ***************************************************************************/
  
  #ifndef _SLG_VARIANCECLAMPING_H
  #define	_SLG_VARIANCECLAMPING_H
  
  #include "luxrays/luxrays.h"
  
  #include "eos/portable_oarchive.hpp"
  #include "eos/portable_iarchive.hpp"
  
  namespace slg {
  
  class Film;
  class SampleResult;
  
  class VarianceClamping {
  public:
  	VarianceClamping();
  	VarianceClamping(const float sqrtMaxValue);
  	
  	bool hasClamping() const { return (sqrtVarianceClampMaxValue > 0.f); }
  	
  	void Clamp(const Film &film, SampleResult &sampleResult) const;
  	// Used by Film::VarianceClampFilm()
  	void Clamp(const float expectedValue[4], float value[4]) const;
  
  	float sqrtVarianceClampMaxValue;
  
  	friend class boost::serialization::access;	
  	
  private:
  	template<class Archive> void serialize(Archive &ar, const u_int version) {
  		ar & sqrtVarianceClampMaxValue;
  	}
  };
  
  }
  
  BOOST_CLASS_VERSION(slg::VarianceClamping, 1)
  
  #endif	/* _SLG_VARIANCECLAMPING_H */
  
  