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Per-thread RNGs and RNG bugfix

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This commit is contained in:
David 2021-08-30 18:34:14 +02:00
commit 52806e4457
6 changed files with 70 additions and 39 deletions
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21
rtweekend.hpp
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@ -8,11 +8,8 @@
#include "timer.hpp"
#include "random.h"
#define FAST_RANDOM 1
#ifdef FAST_RANDOM
pcg32_random_t pcg = { 0x853c49e6748fea9bULL, 0xda3e39cb94b95bdbULL };
#define rand() pcg32_random_r(&pcg)
#endif
pcg32_random_t *pcg_table;
pcg32_random_t default_pcg = { 0x853c49e6748fea9bULL, 0xda3e39cb94b95bdbULL };
/* Utility functions */
inline float degrees_to_radians(float d)
@ -21,15 +18,21 @@ inline float degrees_to_radians(float d)
}
/* Returns a float in the range [0,1) */
inline float random_float()
inline float random_float_()
{
return rand() * (1.0 / RAND_MAX);
}
/* Returns a float in the range [min,max) */
inline float random_float(float min, float max)
/* Returns a float in the range [0,1) */
inline float random_float(int32_t thread_id = 0)
{
return min + (max-min) * random_float();
return pcg32_random_r(&pcg_table[thread_id]) * (1.0 / UINT32_MAX);
}
/* Returns a float in the range [min,max) */
inline float random_float(float min, float max, int32_t thread_id = 0)
{
return min + (max-min) * random_float(thread_id);
}
/* Clamps a value between [min,max] */