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godot/thirdparty/misc/pcg.h

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Replace the existing PRNG (Xorshift31) with (minimal) PCG (XSH-RR variant with 32-bit output, 64-bit state). PCG is better than many alternatives by many metrics (see www.pcg-random.org) including statistical quality with good speed.
2017-01-15 05:34:51 +00:00
// *Really* minimal PCG32 code / (c) 2014 M.E. O'Neill / pcg-random.org
// Licensed under Apache License 2.0 (NO WARRANTY, etc. see website)
#ifndef RANDOM_H
#define RANDOM_H
Make core/ includes absolute, remove subfolders from include path This allows more consistency in the manner we include core headers, where previously there would be a mix of absolute, relative and include path-dependent includes.
2018-09-11 16:13:45 +00:00
#include "core/typedefs.h"
Replace the existing PRNG (Xorshift31) with (minimal) PCG (XSH-RR variant with 32-bit output, 64-bit state). PCG is better than many alternatives by many metrics (see www.pcg-random.org) including statistical quality with good speed.
2017-01-15 05:34:51 +00:00
#define PCG_DEFAULT_INC_64 1442695040888963407ULL
typedef struct { uint64_t state; uint64_t inc; } pcg32_random_t;
uint32_t pcg32_random_r(pcg32_random_t* rng);
Properly setup seed in RNG
2019-03-17 17:51:51 +00:00
void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate, uint64_t initseq);
Fix biased output of randi_range
2020-10-29 12:40:53 +00:00
uint32_t pcg32_boundedrand_r(pcg32_random_t* rng, uint32_t bound);
Replace the existing PRNG (Xorshift31) with (minimal) PCG (XSH-RR variant with 32-bit output, 64-bit state). PCG is better than many alternatives by many metrics (see www.pcg-random.org) including statistical quality with good speed.
2017-01-15 05:34:51 +00:00
#endif // RANDOM_H