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/* -*- c++ -*- */
/*
* Copyright 2008,2009 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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, or (at your option)
* any later version.
*
* GNU Radio 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.
*/
#include <gcell/spu/gc_random.h>
static int last_val = 0;
# define M 259200 // values from Numerical Recipes in C, 1988
# define A 7141
# define C 54773
void
gc_set_seed(int seed)
{
last_val = ((unsigned int) seed) % M;
}
/*
* Return a uniformly distributed value in the range [0, 1.0)
* (Linear congruential generator. YMMV. Caveat emptor.)
*/
float
gc_uniform_deviate(void)
{
last_val = (last_val * A + C) % M;
return (float) last_val * (1.0f / (float) M);
}
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