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/**
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
#include <stdlib.h>
#include <string.h>
#include "MEM_guardedalloc.h"
#include "PIL_time.h"
#include "BLI_rand.h"
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#if defined(WIN32) && !defined(FREE_WINDOWS)
typedef unsigned __int64 r_uint64;
#else
typedef unsigned long long r_uint64;
#endif
#define MULTIPLIER 0x5DEECE66D
#define ADDEND 0xB
#define LOWSEED 0x330E
/***/
typedef struct RNG {
r_uint64 X;
} RNG;
RNG *rng_new(unsigned int seed)
{
RNG *rng = MEM_mallocN(sizeof(*rng), "rng");
rng_seed(rng, seed);
return rng;
}
void rng_free(RNG* rng)
{
MEM_freeN(rng);
}
void rng_seed(RNG *rng, unsigned int seed) {
rng->X= (((r_uint64) seed)<<16) | LOWSEED;
}
int rng_getInt(RNG *rng) {
rng->X= (MULTIPLIER*rng->X + ADDEND)&0x0000FFFFFFFFFFFF;
return (int) (rng->X>>17);
}
double rng_getDouble(RNG *rng) {
return (double) rng_getInt(rng)/0x80000000;
}
float rng_getFloat(RNG *rng) {
return (float) rng_getInt(rng)/0x80000000;
}
void rng_shuffleArray(RNG *rng, void *data, int elemSize, int numElems)
{
int i = numElems;
void *temp = malloc(elemSize);
while (--i) {
int j = rng_getInt(rng)%i;
void *iElem = (unsigned char*)data + i*elemSize;
void *jElem = (unsigned char*)data + j*elemSize;
memcpy(temp, iElem, elemSize);
memcpy(iElem, jElem, elemSize);
memcpy(jElem, temp, elemSize);
}
free(temp);
}
/***/
static RNG theBLI_rng = {0};
void BLI_srand(unsigned int seed) {
rng_seed(&theBLI_rng, seed);
}
int BLI_rand(void) {
return rng_getInt(&theBLI_rng);
}
double BLI_drand(void) {
return rng_getDouble(&theBLI_rng);
}
float BLI_frand(void) {
return rng_getFloat(&theBLI_rng);
}
void BLI_fillrand(void *addr, int len) {
RNG rng;
unsigned char *p= addr;
rng_seed(&rng, (unsigned int) (PIL_check_seconds_timer()*0x7FFFFFFF));
while (len--) *p++= rng_getInt(&rng)&0xFF;
}
void BLI_array_randomize(void *data, int elemSize, int numElems, unsigned int seed)
{
RNG rng;
rng_seed(&rng, seed);
rng_shuffleArray(&rng, data, elemSize, numElems);
}
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