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// Description:
// Fast (pseudo) random number generator.
// The "simple" random generator is usually random enough for game type
// applications and requires just adds and ands. (see Knuth)
// Otherwise "rand()" is used which is quite a bit slower...
//
// Copyright (C) 2001 Frank Becker
//
// 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
//
#ifndef _Random_hpp_
#define _Random_hpp_
#define USE_SIMPLE_RANDOM
#define _RAND_MAX 2147483647
#ifdef USE_SIMPLE_RANDOM
#else
#include <stdlib.h>
#endif
class Random
{
#ifdef USE_SIMPLE_RANDOM
private:
static unsigned int seed1;
static unsigned int seed2;
static unsigned int randomNumbers[ 64];
#endif
public:
static int random( void)
{
#ifdef USE_SIMPLE_RANDOM
unsigned int ret = randomNumbers[ seed1];
ret += randomNumbers[ seed2];
randomNumbers[ seed2] = ret;
seed1 = (seed1+1)&63;
seed2 = (seed2+1)&63;
return ret&_RAND_MAX;
#else
return rand();
#endif
}
static float rangef0_1( void)
{
return (float)random() / (float)(_RAND_MAX);
}
static double ranged0_1( void)
{
return (double)random() / (double)(_RAND_MAX);
}
static unsigned int integer( unsigned int range)
{
return random()%range;
}
};
#endif
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