/*
 * This code is part of the strategy game operational-space.
 * operational-space comes with ABSOLUTELY NO WARRANTY and is licensed under GPL-2.0.
 *    Copyright (C) 2024  VegOwOtenks, Sleppo04
 * 
 * This program 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 2
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#ifndef OPENSIMPLEX2S_H
#define OPENSIMPLEX2S_H

#include <stdint.h>
#include <math.h>


#define PRIME_X         (0x5205402B9270C86FL)
#define PRIME_Y         (0x598CD327003817B5L)
#define HASH_MULTIPLIER (0x53A3F72DEEC546F5L)

#define ROOT2OVER2 (0.7071067811865476)
#define SKEW_2D    (0.366025403784439)
#define UNSKEW_2D  (-0.21132486540518713)

#define N_GRADS_2D_EXPONENT (7)
#define N_GRADS_2D          (1 << N_GRADS_2D_EXPONENT)

#define NORMALIZER_2D (0.05481866495625118)

#define RSQUARED_2D   (2.0f / 3.0f)

/// @brief Get the standard noise using the at position x and y with seed seed
/// @param seed 
/// @param x 
/// @param y 
/// @return noise at x, y with seed seed
// TODO: Don't use this one, it has weird diagonal artifacts
float OpenSimplex_2DNoise(int64_t seed, double x, double y);

float OpenSimplex_2DNoise_ImprovedX(int64_t seed, double x, double y);

#endif