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c9c7f947b5
This came from a long discussion comparing PCG-* against xoroshiro*. Do not generate integers without bias because it doesn't affect us very much and it is easier to reimplement with modulo.
33 lines
709 B
C++
33 lines
709 B
C++
#ifndef GAME_SERVER_PRNG_H
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#define GAME_SERVER_PRNG_H
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#include <base/system.h>
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class CPrng
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{
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public:
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// Creates an unseeded instance.
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CPrng();
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// The name of the random number generator including the current seed.
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const char *Description() const;
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// Seeds the random number generator with the given integer. The random
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// sequence obtained by calling `RandomBits()` repeatedly is guaranteed
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// to be the same for the same seed.
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void Seed(uint64 aSeed[2]);
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// Generates 32 random bits. `Seed()` must be called before calling
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// this function.
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unsigned int RandomBits();
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private:
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char m_aDescription[64];
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bool m_Seeded;
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uint64 m_State;
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uint64 m_Increment;
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};
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#endif // GAME_SERVER_PRNG_H
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