cct.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code 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.
 *
 * Antkeeper source code 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 Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_COLOR_CCT_HPP
#define ANTKEEPER_COLOR_CCT_HPP
 
#include <engine/color/ucs.hpp>
#include <engine/color/xyy.hpp>
#include <engine/math/vector.hpp>
 
namespace color {
 
 
template <class T>
[[nodiscard]] math::vec2<T> cct_to_ucs(T t) noexcept
{
    const T tt = t * t;
    return math::vec2<T>
    {
        (T{0.860117757} + T{1.54118254e-4} * t + T{1.28641212e-7} * tt) / (T{1} + T{8.42420235e-4} * t + T{7.08145163e-7} * tt),
        (T{0.317398726} + T{4.22806245e-5} * t + T{4.20481691e-8} * tt) / (T{1} - T{2.89741816e-5} * t + T{1.61456053e-7} * tt)
    };
}
 
template <class T>
math::vec3<T> cct_to_xyy(T t)
{
    return ucs_to_xyy(cct_to_ucs(t), T{1});
}
 
template <class T>
math::vec3<T> cct_to_xyz(T t)
{
    return xyy_to_xyz(cct_to_xyy(t));
}
 
} // namespace color
 
#endif // ANTKEEPER_COLOR_CCT_HPP