xyy.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_XYY_HPP
#define ANTKEEPER_COLOR_XYY_HPP
 
#include <engine/math/vector.hpp>
 
namespace color {
 
 
template <class T>
[[nodiscard]] inline constexpr T xyy_to_luminance(const math::vec3<T>& x) noexcept
{
    return x[2];
}
 
template <class T>
[[nodiscard]] constexpr math::vec2<T> xyy_to_ucs(const math::vec3<T>& x) noexcept
{
    const T d = (T{1} / (T{-2} * x[0] + T{12} * x[1] + T{3}));
    return math::vec2<T>{(T{4} * x[0]) * d, (T{6} * x[1]) * d};
}
 
template <class T>
[[nodiscard]] constexpr math::vec3<T> xyy_to_xyz(const math::vec3<T>& x) noexcept
{
    return math::vec3<T>{(x[0] * x[2]) / x[1], x[2], ((T{1} - x[0] - x[1]) * x[2]) / x[1]};
}
 
 
} // namespace color
 
#endif // ANTKEEPER_COLOR_XYY_HPP