mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-20 21:24:22 -05:00
033c4e9a5b
* Updated style * Updated files * fixed new line * Updated spacing * File fix WIP * Updated to clang 13 * updated comment style * Removed old comment code
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
|
|
* Copyright (C) 2023 Bernd Herzog
|
|
*
|
|
* This file is part of PortaPack.
|
|
*
|
|
* 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, 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; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "random.hpp"
|
|
|
|
static unsigned long state[N]; /* the array for the state vector */
|
|
static int rnd_left = 1;
|
|
static int rnd_init = 0;
|
|
static unsigned long* rnd_next;
|
|
|
|
/* initializes state[N] with a seed */
|
|
void init_genrand(unsigned long s) {
|
|
int j;
|
|
state[0] = s & 0xffffffffUL;
|
|
|
|
for (j = 1; j < N; j++) {
|
|
state[j] = (1812433253UL * (state[j - 1] ^ (state[j - 1] >> 30)) + j);
|
|
/* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
|
|
/* In the previous versions, MSBs of the seed affect */
|
|
/* only MSBs of the array state[]. */
|
|
/* 2002/01/09 modified by Makoto Matsumoto */
|
|
state[j] &= 0xffffffffUL; /* for >32 bit machines */
|
|
}
|
|
|
|
rnd_left = 1;
|
|
rnd_init = 1;
|
|
}
|
|
|
|
static void next_state(void) {
|
|
unsigned long* p = state;
|
|
int j;
|
|
|
|
/* if init_genrand() has not been called, */
|
|
/* a default initial seed is used */
|
|
if (rnd_init == 0)
|
|
init_genrand(5489UL);
|
|
|
|
rnd_left = N;
|
|
rnd_next = state;
|
|
|
|
for (j = N - M + 1; --j; p++)
|
|
*p = p[M] ^ TWIST(p[0], p[1]);
|
|
|
|
for (j = M; --j; p++)
|
|
*p = p[M - N] ^ TWIST(p[0], p[1]);
|
|
|
|
*p = p[M - N] ^ TWIST(p[0], state[0]);
|
|
}
|
|
|
|
long genrand_int31(void) {
|
|
unsigned long y;
|
|
|
|
if (--rnd_left == 0)
|
|
next_state();
|
|
y = *rnd_next++;
|
|
|
|
/* Tempering */
|
|
y ^= (y >> 11);
|
|
y ^= (y << 7) & 0x9d2c5680UL;
|
|
y ^= (y << 15) & 0xefc60000UL;
|
|
y ^= (y >> 18);
|
|
|
|
return (long)(y >> 1);
|
|
}
|