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48 lines
1.4 KiB
C++
48 lines
1.4 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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#include <string_view>
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/*
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Provides central implementation of the RNG logic
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*/
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namespace Misc::Rng
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{
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/// The use of a rather minimalistic prng is preferred to avoid saving a lot of state in the save game.
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using Generator = std::minstd_rand;
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Generator& getGenerator();
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std::string serialize(const Generator& prng);
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void deserialize(std::string_view data, Generator& prng);
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/// returns default seed for RNG
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unsigned int generateDefaultSeed();
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/// seed the RNG
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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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float rollProbability();
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float rollProbability(Generator& prng);
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/// return value in range [0.0f, 1.0f] <- note closed upper range.
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float rollClosedProbability();
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float rollClosedProbability(Generator& prng);
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/// return value in range [0, max) <- note open upper range.
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int rollDice(int max);
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int rollDice(int max, Generator& prng);
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/// return value in range [0, 99]
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inline int roll0to99(Generator& prng) { return rollDice(100, prng); }
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inline int roll0to99() { return rollDice(100); }
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float deviate(float mean, float deviation);
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float deviate(float mean, float deviation, Generator& prng);
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}
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#endif
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