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51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
#ifndef OPENMW_COMPONENTS_MISC_RNG_H
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#define OPENMW_COMPONENTS_MISC_RNG_H
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#include <cassert>
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#include <random>
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namespace Misc
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{
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/*
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Provides central implementation of the RNG logic
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*/
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class Rng
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{
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public:
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class Seed
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{
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std::mt19937 mGenerator;
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public:
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Seed() = default;
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Seed(const Seed&) = delete;
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Seed(unsigned int seed);
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friend class Rng;
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};
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static Seed& getSeed();
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/// seed the RNG
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static void init(unsigned int seed = generateDefaultSeed());
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/// return value in range [0.0f, 1.0f) <- note open upper range.
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static float rollProbability(Seed& seed = getSeed());
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/// return value in range [0.0f, 1.0f] <- note closed upper range.
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static float rollClosedProbability(Seed& seed = getSeed());
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/// return value in range [0, max) <- note open upper range.
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static int rollDice(int max, Seed& seed = getSeed());
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/// return value in range [0, 99]
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static int roll0to99(Seed& seed = getSeed()) { return rollDice(100, seed); }
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/// returns default seed for RNG
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static unsigned int generateDefaultSeed();
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static float deviate(float mean, float deviation, Seed& seed = getSeed());
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};
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}
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#endif
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