aces.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_ACES_HPP
#define ANTKEEPER_COLOR_ACES_HPP
 
#include <engine/color/rgb.hpp>
#include <engine/math/matrix.hpp>
#include <engine/math/vector.hpp>
 
namespace color {
 
 
template <class T>
constexpr math::vec2<T> aces_white_point = {T{0.32168}, T{0.33767}};
 
template <class T>
constexpr rgb_color_space<T> aces_ap0
(
    {T{0.7347}, T{ 0.2653}},
    {T{0.0000}, T{ 1.0000}},
    {T{0.0001}, T{-0.0770}},
    aces_white_point<T>,
    nullptr,
    nullptr
);
 
template <class T>
constexpr rgb_color_space<T> aces_ap1
(
    {T{0.713}, T{0.293}},
    {T{0.165}, T{0.830}},
    {T{0.128}, T{0.044}},
    aces_white_point<T>,
    nullptr,
    nullptr
);
 
template <class T>
[[nodiscard]] constexpr math::mat3<T> aces_adjust_saturation(T s, const math::vec3<T>& to_y) noexcept
{
    const math::vec3<T> v = to_y * (T{1} - s);
    return math::mat3<T>
    {
        v[0] + s, v[0],     v[0],
        v[1],     v[1] + s, v[1],
        v[2],     v[2],     v[2] + s
    };
}
 
template <class T>
constexpr math::mat3<T> aces_ap1_rrt_sat = aces_adjust_saturation(T{0.96}, aces_ap1<T>.to_y);
 
template <class T>
constexpr math::mat3<T> aces_ap1_odt_sat = aces_adjust_saturation(T{0.93}, aces_ap1<T>.to_y);
 
 
} // namespace color
 
#endif // ANTKEEPER_COLOR_ACES_HPP