godot/core/math/pcg.h
Ferenc Arn 4c9004671a 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 19:15:16 -06:00

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// *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
#include "typedefs.h"
#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);
#endif // RANDOM_H