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merge changes from the defunct ubot

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dmitry 2020-06-12 18:52:38 +03:00 • committed by jeefo
commit cf501b75b7
90 changed files with 11977 additions and 3907 deletions
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65
include/crlib/cr-random.h
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//
// Yet Another POD-Bot, based on PODBot by Markus Klinge ("CountFloyd").
// Copyright (c) Yet Another POD-Bot Contributors <yapb@entix.io>.
//
// This software is licensed under the MIT license.
// Additional exceptions apply. For full license details, see LICENSE.txt
//
#pragma once
#include <time.h>
#include <crlib/cr-basic.h>
CR_NAMESPACE_BEGIN
// random number generator see: https://github.com/preshing/RandomSequence/
class Random final : public Singleton <Random> {
private:
uint32 m_index, m_offset;
uint64 m_divider;
public:
explicit Random () {
const auto base = static_cast <uint32> (time (nullptr));
const auto offset = base + 1;
m_index = premute (premute (base) + 0x682f0161);
m_offset = premute (premute (offset) + 0x46790905);
m_divider = (static_cast <uint64> (1)) << 32;
}
~Random () = default;
private:
uint32 premute (uint32 index) {
static constexpr auto prime = 4294967291u;
if (index >= prime) {
return index;
}
const uint32 residue = (static_cast <uint64> (index) * index) % prime;
return (index <= prime / 2) ? residue : prime - residue;
}
uint32 generate () {
return premute ((premute (m_index++) + m_offset) ^ 0x5bf03635);
}
public:
template <typename U> U int_ (U low, U high) {
return static_cast <U> (generate () * (static_cast <double> (high) - static_cast <double> (low) + 1.0) / m_divider + static_cast <double> (low));
}
float float_ (float low, float high) {
return static_cast <float> (generate () * (static_cast <double> (high) - static_cast <double> (low)) / (m_divider - 1) + static_cast <double> (low));
}
template <typename U> bool chance (const U max, const U maxChance = 100) {
return int_ <U> (0, maxChance) < max;
}
};
// expose global random generator
CR_EXPOSE_GLOBAL_SINGLETON (Random, rg);
CR_NAMESPACE_END