diff options
author | Yuri Rubinsky <chaosus89@gmail.com> | 2023-03-02 12:46:25 +0300 |
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committer | Yuri Sizov <yuris@humnom.net> | 2023-03-27 16:59:46 +0200 |
commit | a397474bd0b37ad44e75fb124683b7e28b7ce9b5 (patch) | |
tree | 62f4f7ce8473fd88e54250c7907b448677f0ac85 /core/math | |
parent | 2e37c05fe6aa16625b7e09f3c30c58804405da84 (diff) |
Fix randfn to prevent generating of nan values
(cherry picked from commit d11bb866ffb1d5e0215ffc11dd6848a11976d90e)
Diffstat (limited to 'core/math')
-rw-r--r-- | core/math/random_pcg.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/core/math/random_pcg.h b/core/math/random_pcg.h index fe40e7f76a..cc22b23b70 100644 --- a/core/math/random_pcg.h +++ b/core/math/random_pcg.h @@ -126,10 +126,18 @@ public: } _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 + double temp = randd(); + if (temp < CMP_EPSILON) { + temp += CMP_EPSILON; // To prevent generating of INF value in log function, resulting to return NaN value from this function. + } + return p_mean + p_deviation * (cos(Math_TAU * randd()) * sqrt(-2.0 * log(temp))); // Box-Muller transform. } _FORCE_INLINE_ float randfn(float p_mean, float p_deviation) { - return p_mean + p_deviation * (cos((float)Math_TAU * randf()) * sqrt(-2.0 * log(randf()))); // Box-Muller transform + float temp = randf(); + if (temp < CMP_EPSILON) { + temp += CMP_EPSILON; // To prevent generating of INF value in log function, resulting to return NaN value from this function. + } + return p_mean + p_deviation * (cos((float)Math_TAU * randf()) * sqrt(-2.0 * log(temp))); // Box-Muller transform. } double random(double p_from, double p_to); |