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#pragma once
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#include <stdint.h>
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namespace ReverbHallRoom
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{
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class LcgRandom
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{
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private:
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uint64_t x;
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uint64_t a;
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uint64_t c;
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double doubleInv;
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float floatUintInv;
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float floatIntInv;
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public:
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inline LcgRandom(uint64_t seed = 0)
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{
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x = seed;
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a = 22695477;
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c = 1;
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doubleInv = 1.0 / (double)UINT32_MAX;
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floatUintInv = 1.0 / (float)UINT32_MAX;
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floatIntInv = 1.0 / (float)INT32_MAX;
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}
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inline void SetSeed(uint64_t seed)
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{
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x = seed;
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}
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inline uint32_t NextUInt()
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{
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uint64_t axc = a * x + c;
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//x = axc % m;
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x = axc & 0xFFFFFFFF;
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return (uint32_t)x;
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}
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inline int32_t NextInt()
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{
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int64_t axc = a * x + c;
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//x = axc % m;
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x = axc & 0x7FFFFFFF;
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return (int32_t)x;
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}
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inline double NextDouble()
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{
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auto n = NextUInt();
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return n * doubleInv;
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}
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inline float NextFloat()
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{
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auto n = NextInt();
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return n * floatIntInv;
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}
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inline void GetFloats(float* buffer, int len)
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{
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for (int i = 0; i < len; i++)
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buffer[i] = NextFloat();
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}
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inline void GetFloatsBipolar(float* buffer, int len)
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{
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for (int i = 0; i < len; i++)
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buffer[i] = NextFloat() * 2 - 1;
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}
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};
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}
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