virtualx-engine/thirdparty/misc/pcg.h

// *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 "core/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);
void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate, uint64_t initseq);
uint32_t pcg32_boundedrand_r(pcg32_random_t* rng, uint32_t bound);

#endif // RANDOM_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 06:34:51 +01:00			`// 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 18:13:45 +02:00			`#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 06:34:51 +01:00
			`#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 18:51:51 +01:00			`void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate, uint64_t initseq);`
Fix biased output of randi_range 2020-10-29 13:40:53 +01:00			`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 06:34:51 +01:00
			`#endif // RANDOM_H`