/*
 *
 * Copyright 2022 Camille "DrasLorus" Monière.
 *
 * This file is part of CORDIC_Rotate_APFX.
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this program.
 * If not, see <https://www.gnu.org/licenses/>.
 *
 */

#ifndef _DEFINITIONS_HPP_
#define _DEFINITIONS_HPP_

#include <cstddef>
#include <cstdint>

#ifdef M_PI
constexpr double pi = M_PI;
#else
constexpr double pi = 3.14159265358979323846;
#endif

constexpr double half_pi = pi / 2;
constexpr double inv_pi  = 1 / pi;
constexpr double two_pi  = 2 * pi;
constexpr double inv_2pi = 0.5 * inv_pi;

constexpr uint32_t needed_bits(uint32_t value) {
    uint32_t result = 0;
    while (value > 0) {
        result++;
        value >>= 1;
    }
    return result;
}

constexpr bool is_pow_2(uint32_t value) {
    return (1U << (needed_bits(value) - 1)) == value;
}

#endif // _DEFINITIONS_HPP_