source/src/utility/gamma.hpp

/*
 * Copyright (C) 2020  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_GAMMA_HPP
#define ANTKEEPER_GAMMA_HPP

#include "math/vector-type.hpp"
#include <cmath>

template <typename T, std::size_t N>
math::vector<T, N> to_linear(math::vector<T, N> v)
{
	constexpr T gamma = T(2.2);
	
	for (std::size_t i = 0; i < N; ++i)
	{
		v[i] = pow(v[i], gamma);
	}
	
	return v;
}

template <typename T, std::size_t N>
math::vector<T, N> to_srgb(math::vector<T, N> v)
{
	constexpr T inverse_gamma = T(1) / T(2.2);
	
	for (std::size_t i = 0; i < N; ++i)
	{
		v[i] = pow(v[i], inverse_gamma);
	}
	
	return v;
}

#endif // ANTKEEPER_GAMMA_HPP