72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
#pragma once
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#if __cplusplus
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extern "C" {
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#endif
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#include "../base/std.h"
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#include "splitmix64/splitmix64.h"
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#include "xoroshiro/xoroshiro.h"
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#include "xoshiro/xoshiro.h"
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/*
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You can choose any algorithm that has required functions:
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some_alg32_statePtr some_alg32_init(u32 seed);
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u32 some_alg32_next(some_alg32_statePtr);
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void some_alg32_free(some_alg32_statePtr);
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#define KRAND_ALG32_init some_alg32_init
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#define KRAND_ALG32_next some_alg32_next
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#define KRAND_ALG32_free some_alg32_free
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#include "kerep/random/krandom.h"
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The same way it works for 64-bit RNGs
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*/
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// default rng_next function
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#ifndef KRAND_ALG32_next
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#define KRAND_ALG32_next xoshiro128plus##_next
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#endif
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#ifndef KRAND_ALG32_init
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#define KRAND_ALG32_init xoshiro128plus##_init
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#endif
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#ifndef KRAND_ALG32_free
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#define KRAND_ALG32_free xoshiro128plus##_free
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#endif
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#ifndef KRAND_ALG64_next
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#define KRAND_ALG64_next xoshiro256plus##_next
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#endif
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#ifndef KRAND_ALG64_init
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#define KRAND_ALG64_init xoshiro256plus##_init
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#endif
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#ifndef KRAND_ALG64_free
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#define KRAND_ALG64_free xoshiro256plus##_free
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#endif
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typedef void* krand_statePtr;
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#define KRAND_ALG32_initFromTime xoshiro128plus##_initFromTime
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#define KRAND_ALG64_initFromTime xoshiro256plus##_initFromTime
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#define __krand_next_definition(VALUE_SIZE) { return from+KRAND_ALG##VALUE_SIZE##_next(state)%(to-from); }
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// ready-to-use functions
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static inline i8 krand_next8 (krand_statePtr state, i8 from, i8 to) __krand_next_definition(32)
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static inline i16 krand_next16(krand_statePtr state, i16 from, i16 to) __krand_next_definition(32)
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static inline i32 krand_next32(krand_statePtr state, i32 from, i32 to) __krand_next_definition(32)
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static inline i64 krand_next64(krand_statePtr state, i64 from, i64 to) __krand_next_definition(64)
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// divides random number by 2^64 to return a value between 0 and 1
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static inline f32 krand_nextFloat32(krand_statePtr state) {return (u32)KRAND_ALG32_next(state)/0xffffffff; }
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static inline f64 krand_nextFloat64(krand_statePtr state) {return KRAND_ALG64_next(state)/0xffffffff; }
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///@param chance (0-1.0) is probability of success
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static inline bool fate(krand_statePtr state,float chance){
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i32 limit=1/chance + 0.01f;
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return KRAND_ALG32_next(state)%limit == 0;
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}
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#if __cplusplus
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}
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#endif |