taisei/src/random.h

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/*
* This software is licensed under the terms of the MIT License.
* See COPYING for further information.
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* ---
* Copyright (c) 2011-2019, Lukas Weber <laochailan@web.de>.
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* Copyright (c) 2012-2019, Andrei Alexeyev <akari@taisei-project.org>.
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*/
#ifndef IGUARD_random_h
#define IGUARD_random_h
#include "taisei.h"
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typedef struct RandomState {
uint64_t state[4];
bool locked;
} RandomState;
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uint64_t splitmix64(uint64_t *state);
uint64_t makeseed(void);
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void tsrand_init(RandomState *rnd, uint64_t seed);
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void tsrand_switch(RandomState *rnd);
void tsrand_seed_p(RandomState *rnd, uint64_t seed);
uint32_t tsrand_p(RandomState *rnd);
uint64_t tsrand64_p(RandomState *rnd);
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void tsrand_seed(uint64_t seed);
uint32_t tsrand(void);
uint64_t tsrand64(void);
void tsrand_lock(RandomState *rnd);
void tsrand_unlock(RandomState *rnd);
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double frand(void); // Range: [0.0; 1.0)
double nfrand(void); // Range: (-1.0; 1.0)
bool rand_bool(void);
double rand_sign(void); // 1.0 or -1.0
float rand_signf(void); // 1.0f or -1.0f
void _tsrand_fill_p(RandomState *rnd, int amount, const char *file, uint line);
void _tsrand_fill(int amount, const char *file, uint line);
uint32_t _tsrand_a(int idx, const char *file, uint line);
uint64_t _tsrand64_a(int idx, const char *file, uint line);
double _afrand(int idx, const char *file, uint line);
double _anfrand(int idx, const char *file, uint line);
#define tsrand_fill_p(rnd,amount) _tsrand_fill_p(rnd, amount, __FILE__, __LINE__)
#define tsrand_fill(amount) _tsrand_fill(amount, __FILE__, __LINE__)
#define tsrand_a(idx) _tsrand_a(idx, __FILE__, __LINE__)
#define afrand(idx) _afrand(idx, __FILE__, __LINE__)
#define anfrand(idx) _anfrand(idx, __FILE__, __LINE__)
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#define TSRAND_ARRAY_LIMIT 16
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// Range: [rmin; rmax)
INLINE double rand_range(double rmin, double rmax) {
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// TODO: ensure uniform distribution?
return frand() * (rmax - rmin) + rmin;
}
INLINE double rand_angle(void) {
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// TODO: ensure uniform distribution?
return frand() * (M_PI * 2);
}
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INLINE bool rand_chance(double chance) {
return frand() < chance;
}
#endif // IGUARD_random_h