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/*
* ***** BEGIN GPL 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.
*
* 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.
*
* 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 LICENSE BLOCK *****
*/
/** \file blender/blenlib/intern/rand.c
* \ingroup bli
*/
#include <stdlib.h>
#include <string.h>
#include "MEM_guardedalloc.h"
#include "PIL_time.h"
#include "BLI_threads.h"
#include "BLI_rand.h"
#ifdef _MSC_VER
typedef unsigned __int64 r_uint64;
#define MULTIPLIER 0x5DEECE66Di64
#define MASK 0x0000FFFFFFFFFFFFi64
#else
typedef unsigned long long r_uint64;
#define MULTIPLIER 0x5DEECE66Dll
#define MASK 0x0000FFFFFFFFFFFFll
#endif
#define ADDEND 0xB
#define LOWSEED 0x330E
extern unsigned char hash[]; // noise.c
/***/
struct RNG {
r_uint64 X;
};
RNG *BLI_rng_new(unsigned int seed)
{
RNG *rng = MEM_mallocN(sizeof(*rng), "rng");
BLI_rng_seed(rng, seed);
return rng;
}
RNG *BLI_rng_new_srandom(unsigned int seed)
{
RNG *rng = MEM_mallocN(sizeof(*rng), "rng");
BLI_rng_srandom(rng, seed);
return rng;
}
void BLI_rng_free(RNG *rng)
{
MEM_freeN(rng);
}
void BLI_rng_seed(RNG *rng, unsigned int seed)
{
rng->X = (((r_uint64) seed) << 16) | LOWSEED;
}
void BLI_rng_srandom(RNG *rng, unsigned int seed)
{
BLI_rng_seed(rng, seed + hash[seed & 255]);
seed = BLI_rng_get_int(rng);
BLI_rng_seed(rng, seed + hash[seed & 255]);
seed = BLI_rng_get_int(rng);
BLI_rng_seed(rng, seed + hash[seed & 255]);
}
int BLI_rng_get_int(RNG *rng)
{
rng->X = (MULTIPLIER * rng->X + ADDEND) & MASK;
return (int) (rng->X >> 17);
}
double BLI_rng_get_double(RNG *rng)
{
return (double) BLI_rng_get_int(rng) / 0x80000000;
}
float BLI_rng_get_float(RNG *rng)
{
return (float) BLI_rng_get_int(rng) / 0x80000000;
}
void BLI_rng_shuffle_array(RNG *rng, void *data, int elemSize, int numElems)
{
int i = numElems;
void *temp;
if (numElems <= 0) {
return;
}
temp = malloc(elemSize);
/* XXX Shouldn't it rather be "while (i--) {" ?
* Else we have no guaranty first (0) element has a chance to be shuffled... --mont29 */
while (--i) {
int j = BLI_rng_get_int(rng) % numElems;
if (i != j) {
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);
}
void BLI_rng_skip(RNG *rng, int n)
{
int i;
for (i = 0; i < n; i++)
BLI_rng_get_int(rng);
}
/***/
/* initialize with some non-zero seed */
static RNG theBLI_rng = {611330372042337130};
/* using hash table to create better seed */
void BLI_srandom(unsigned int seed)
{
BLI_rng_srandom(&theBLI_rng, seed);
}
int BLI_rand(void)
{
return BLI_rng_get_int(&theBLI_rng);
}
float BLI_frand(void)
{
return BLI_rng_get_float(&theBLI_rng);
}
float BLI_hash_frand(unsigned int seed)
{
RNG rng;
BLI_rng_srandom(&rng, seed);
return BLI_rng_get_float(&rng);
}
void BLI_array_randomize(void *data, int elemSize, int numElems, unsigned int seed)
{
RNG rng;
BLI_rng_seed(&rng, seed);
BLI_rng_shuffle_array(&rng, data, elemSize, numElems);
}
/* ********* for threaded random ************** */
static RNG rng_tab[BLENDER_MAX_THREADS];
void BLI_thread_srandom(int thread, unsigned int seed)
{
if (thread >= BLENDER_MAX_THREADS)
thread = 0;
BLI_rng_seed(&rng_tab[thread], seed + hash[seed & 255]);
seed = BLI_rng_get_int(&rng_tab[thread]);
BLI_rng_seed(&rng_tab[thread], seed + hash[seed & 255]);
seed = BLI_rng_get_int(&rng_tab[thread]);
BLI_rng_seed(&rng_tab[thread], seed + hash[seed & 255]);
}
int BLI_thread_rand(int thread)
{
return BLI_rng_get_int(&rng_tab[thread]);
}
float BLI_thread_frand(int thread)
{
return BLI_rng_get_float(&rng_tab[thread]);
}
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