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Code Releases Wiki Activity

Implement random number generator

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Co-authored-by: Zirak <zirakertan@gmail.com>
This commit is contained in:
Chaosus
2018-09-21 14:32:17 +03:00
parent 8849d3b47d
commit f8151a9e50
8 changed files with 287 additions and 17 deletions
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25
core/math/math_funcs.cpp
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@@ -30,30 +30,27 @@
#include "math_funcs.h"
#include "core/os/os.h"
pcg32_random_t Math::default_pcg = { 12047754176567800795ULL, PCG_DEFAULT_INC_64 };
RandomPCG Math::default_rand(RandomPCG::DEFAULT_SEED, RandomPCG::DEFAULT_INC);
#define PHI 0x9e3779b9
// TODO: we should eventually expose pcg.inc too
uint32_t Math::rand_from_seed(uint64_t *seed) {
pcg32_random_t pcg = { *seed, PCG_DEFAULT_INC_64 };
uint32_t r = pcg32_random_r(&pcg);
*seed = pcg.state;
RandomPCG rng = RandomPCG(*seed, RandomPCG::DEFAULT_INC);
uint32_t r = rng.rand();
*seed = rng.get_seed();
return r;
}
void Math::seed(uint64_t x) {
default_pcg.state = x;
default_rand.seed(x);
}
void Math::randomize() {
seed(OS::get_singleton()->get_ticks_usec() * default_pcg.state + PCG_DEFAULT_INC_64);
default_rand.randomize();
}
uint32_t Math::rand() {
return pcg32_random_r(&default_pcg);
return default_rand.rand();
}
int Math::step_decimals(double p_step) {
@@ -169,13 +166,9 @@ uint32_t Math::larger_prime(uint32_t p_val) {
}
double Math::random(double from, double to) {
unsigned int r = Math::rand();
double ret = (double)r / (double)RANDOM_MAX;
return (ret) * (to - from) + from;
return default_rand.random(from, to);
}
float Math::random(float from, float to) {
unsigned int r = Math::rand();
float ret = (float)r / (float)RANDOM_MAX;
return (ret) * (to - from) + from;
return default_rand.random(from, to);
}