💿🐜 Antkeeper source code
https://antkeeper.com
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86 lines
2.6 KiB
86 lines
2.6 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_PHYSICS_LIGHT_PHOTOMETRY_HPP
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#define ANTKEEPER_PHYSICS_LIGHT_PHOTOMETRY_HPP
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#include "math/constants.hpp"
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#include "math/quadrature.hpp"
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namespace physics {
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namespace light {
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/// Maximum luminous efficacy of an ideal monochromatic source, in lumen per watt.
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template <class T>
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constexpr T max_luminous_efficacy = T(683.002);
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/**
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* Calculates the luminous efficiency of a light source.
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*
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* @param spd Unary function object that returns spectral radiance given a wavelength.
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* @param lef Unary function object that returns luminous efficiency given a wavelength.
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* @param first,last Range of sample wavelengths.
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* @return Luminous efficiency, on `[0, 1]`.
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*
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* @see physics::light::blackbody::spectral_radiance
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* @see physics::light::luminosity::photopic
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*/
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template <class T, class UnaryOp1, class UnaryOp2, class InputIt>
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T luminous_efficiency(UnaryOp1 spd, UnaryOp2 lef, InputIt first, InputIt last)
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{
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auto spd_lef = [spd, lef](T x) -> T
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{
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return spd(x) * lef(x);
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};
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const T num = math::quadrature::simpson(spd_lef, first, last);
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const T den = math::quadrature::simpson(spd, first, last);
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return num / den;
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}
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/**
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* Calculates luminous efficacy given luminous efficiency.
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*
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* @param efficiency Luminous efficiency, on `[0, 1]`.
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* @return Luminous flux, in lumens.
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*/
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template <class T>
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T luminous_efficacy(T efficiency)
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{
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return max_luminous_efficacy<T> * efficiency;
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}
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/**
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* Converts watts (radiant flux) to lumens (luminous flux).
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*
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* @param radiant_flux Radiant flux, in watts.
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* @param efficiency Luminous efficiency, on `[0, 1]`.
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* @return Luminous flux, in lumens.
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*/
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template <class T>
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T watts_to_lumens(T radiant_flux, T efficiency)
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{
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return radiant_flux * luminous_efficacy(efficiency);
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}
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} // namespace light
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} // namespace physics
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#endif // ANTKEEPER_PHYSICS_LIGHT_PHOTOMETRY_HPP
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