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Merge pull request #27043 from Chaosus/randfn

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Added gaussian distribution function to RNG
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Yuri Roubinsky 2019-04-07 08:32:04 +03:00 • committed by GitHub
commit 134be5c728
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4 changed files with 23 additions and 0 deletions
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9
core/math/random_pcg.h
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@ -31,6 +31,8 @@
#ifndef RANDOM_PCG_H
#define RANDOM_PCG_H
#include <math.h>
#include "core/math/math_defs.h"
#include "thirdparty/misc/pcg.h"
@ -61,6 +63,13 @@ public:
_FORCE_INLINE_ double randd() { return (double)rand() / (double)RANDOM_MAX; }
_FORCE_INLINE_ float randf() { return (float)rand() / (float)RANDOM_MAX; }
_FORCE_INLINE_ double randfn(double p_mean, double p_deviation) {
return p_mean + p_deviation * (cos(Math_TAU * randd()) * sqrt(-2.0 * log(randd()))); // Box-Muller transform
}
_FORCE_INLINE_ float randfn(float p_mean, float p_deviation) {
return p_mean + p_deviation * (cos(Math_TAU * randf()) * sqrt(-2.0 * log(randf()))); // Box-Muller transform
}
double random(double p_from, double p_to);
float random(float p_from, float p_to);
real_t random(int p_from, int p_to) { return (real_t)random((real_t)p_from, (real_t)p_to); }