math.pdf.h

/*
    Lightmetrica : A research-oriented renderer

    Copyright (c) 2014 Hisanari Otsu

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once
#ifndef LIB_LIGHTMETRICA_MATH_PDF_H
#define LIB_LIGHTMETRICA_MATH_PDF_H

#include "math.common.h"

LM_NAMESPACE_BEGIN
LM_MATH_NAMESPACE_BEGIN

enum class ProbabilityMeasure
{

    None,

    SolidAngle,
    
    ProjectedSolidAngle,

    Area,

    Discrete,

};

template <typename T>
struct TPDFEval
{

    TPDFEval()
        : v(T(0))
        , measure(ProbabilityMeasure::None)
    {

    }

    TPDFEval(const T& v, ProbabilityMeasure measure)
        : v(v)
        , measure(measure)
    {

    }

    T v;                            
    ProbabilityMeasure measure;     

};

template <typename T> LM_FORCE_INLINE TPDFEval<T> operator*(const TPDFEval<T>& p, const T& s) { return TPDFEval<T>(p.v * s, p.measure); }
template <typename T> LM_FORCE_INLINE TPDFEval<T> operator*(const T& s, const TPDFEval<T>& p) { return TPDFEval<T>(s * p.v, p.measure); }

LM_MATH_NAMESPACE_END
LM_NAMESPACE_END

#endif // LIB_LIGHTMETRICA_MATH_PDF_H