89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#ifndef __BLI_RAND_H__
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#define __BLI_RAND_H__
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/** \file BLI_rand.h
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* \ingroup bli
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* \brief Random number functions.
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*/
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/* RNG is an abstract random number generator type that avoids using globals.
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* Always use this instead of the global RNG unless you have a good reason,
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* the global RNG is not thread safe and will not give repeatable results.
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*/
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struct RNG;
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typedef struct RNG RNG;
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struct RNG *BLI_rng_new(unsigned int seed);
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struct RNG *BLI_rng_new_srandom(unsigned int seed);
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void BLI_rng_free(struct RNG *rng);
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void BLI_rng_seed(struct RNG *rng, unsigned int seed);
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void BLI_rng_srandom(struct RNG *rng, unsigned int seed);
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int BLI_rng_get_int(struct RNG *rng);
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double BLI_rng_get_double(struct RNG *rng);
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float BLI_rng_get_float(struct RNG *rng);
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void BLI_rng_shuffle_array(struct RNG *rng, void *data, int elemSize, int numElems);
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/** Note that skipping is as slow as generating n numbers! */
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void BLI_rng_skip(struct RNG *rng, int n);
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/** Seed for the random number generator, using noise.c hash[] */
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void BLI_srandom(unsigned int seed);
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/** Return a pseudo-random number N where 0<=N<(2^31) */
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int BLI_rand(void);
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/** Return a pseudo-random number N where 0.0f<=N<1.0f */
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float BLI_frand(void);
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/** Return a pseudo-random (hash) float from an integer value */
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float BLI_hash_frand(unsigned int seed);
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/** Shuffle an array randomly using the given seed.
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* contents. This routine does not use nor modify
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* the state of the BLI random number generator.
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*/
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void BLI_array_randomize(void *data, int elemSize, int numElems, unsigned int seed);
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/** Better seed for the random number generator, using noise.c hash[] */
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/** Allows up to BLENDER_MAX_THREADS threads to address */
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void BLI_thread_srandom(int thread, unsigned int seed);
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/** Return a pseudo-random number N where 0<=N<(2^31) */
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/** Allows up to BLENDER_MAX_THREADS threads to address */
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int BLI_thread_rand(int thread);
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/** Return a pseudo-random number N where 0.0f<=N<1.0f */
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/** Allows up to BLENDER_MAX_THREADS threads to address */
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float BLI_thread_frand(int thread);
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#endif /* __BLI_RAND_H__ */
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