e2e1984e60
A few headers like BLI_math_constants.h and BLI_utildefines.h keep working for C code, for remaining makesdna and userdef defaults code in C. Pull Request: https://projects.blender.org/blender/blender/pulls/134406
101 lines
3.6 KiB
C
101 lines
3.6 KiB
C
/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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#include "BLI_compiler_attrs.h"
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#include "BLI_sys_types.h"
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/** \file
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* \ingroup bli
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* \brief Random number functions.
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*/
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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_THREAD_ARRAY;
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typedef struct RNG_THREAD_ARRAY RNG_THREAD_ARRAY;
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struct RNG *BLI_rng_new(unsigned int seed);
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/**
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* A version of #BLI_rng_new that hashes the seed.
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*/
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struct RNG *BLI_rng_new_srandom(unsigned int seed);
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void BLI_rng_free(struct RNG *rng) ATTR_NONNULL(1);
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void BLI_rng_seed(struct RNG *rng, unsigned int seed) ATTR_NONNULL(1);
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/**
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* Use a hash table to create better seed.
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*/
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void BLI_rng_srandom(struct RNG *rng, unsigned int seed) ATTR_NONNULL(1);
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void BLI_rng_get_char_n(RNG *rng, char *bytes, size_t bytes_len) ATTR_NONNULL(1, 2);
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int BLI_rng_get_int(struct RNG *rng) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
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unsigned int BLI_rng_get_uint(struct RNG *rng) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
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/**
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* \return Random value (0..1), but never 1.0.
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*/
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double BLI_rng_get_double(struct RNG *rng) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
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/**
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* \return Random value (0..1), but never 1.0.
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*/
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float BLI_rng_get_float(struct RNG *rng) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
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/**
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* Generate a random point inside given tri.
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*/
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void BLI_rng_get_tri_sample_float_v2(struct RNG *rng,
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const float v1[2],
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const float v2[2],
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const float v3[2],
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float r_pt[2]) ATTR_NONNULL();
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void BLI_rng_shuffle_array(struct RNG *rng,
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void *data,
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unsigned int elem_size_i,
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unsigned int elem_num) ATTR_NONNULL(1, 2);
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void BLI_rng_shuffle_bitmap(struct RNG *rng, unsigned int *bitmap, unsigned int bits_num)
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ATTR_NONNULL(1, 2);
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/** Note that skipping is as slow as generating n numbers! */
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/**
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* Simulate getting \a n random values.
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*
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* \note Useful when threaded code needs consistent values, independent of task division.
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*/
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void BLI_rng_skip(struct RNG *rng, int n) ATTR_NONNULL(1);
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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) ATTR_WARN_UNUSED_RESULT;
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/**
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* Shuffle an array randomly using the given seed contents.
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* This routine does not use nor modify the state of the BLI random number generator.
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*/
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void BLI_array_randomize(void *data,
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unsigned int elem_size,
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unsigned int elem_num,
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unsigned int seed);
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void BLI_bitmap_randomize(unsigned int *bitmap, unsigned int bits_num, unsigned int seed)
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ATTR_NONNULL(1);
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/** array versions for thread safe random generation */
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RNG_THREAD_ARRAY *BLI_rng_threaded_new(void);
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void BLI_rng_threaded_free(struct RNG_THREAD_ARRAY *rngarr) ATTR_NONNULL(1);
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int BLI_rng_thread_rand(RNG_THREAD_ARRAY *rngarr, int thread) ATTR_WARN_UNUSED_RESULT;
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/* Low-discrepancy sequences. */
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/** Return the _n_th number of the given low-discrepancy sequence. */
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void BLI_halton_1d(unsigned int prime, double offset, int n, double *r);
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void BLI_halton_2d(const unsigned int prime[2], double offset[2], int n, double *r);
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void BLI_halton_3d(const unsigned int prime[3], double offset[3], int n, double *r);
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void BLI_hammersley_1d(unsigned int n, double *r);
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