71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
//
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// YaPB - Counter-Strike Bot based on PODBot by Markus Klinge.
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// Copyright © 2004-2021 YaPB Project <yapb@jeefo.net>.
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//
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// SPDX-License-Identifier: MIT
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//
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#pragma once
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#include <crlib/cr-basic.h>
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CR_NAMESPACE_BEGIN
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// based on: https://github.com/jeudesprits/PSWyhash/blob/master/Sources/CWyhash/include/wyhash.h
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class Random : public Singleton <Random> {
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private:
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uint64 div_ { static_cast <uint64> (1) << 32ull };
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uint64 state_ { static_cast <uint64> (time (nullptr)) };
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public:
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explicit Random () = default;
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~Random () = default;
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private:
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uint64 wyrand64 () {
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constexpr uint64 wyp0 = 0xa0761d6478bd642full, wyp1 = 0xe7037ed1a0b428dbull;
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state_ += wyp0;
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return mul (state_ ^ wyp1, state_);
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}
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uint32 wyrand32 () {
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return static_cast <uint32> (wyrand64 ());
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}
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private:
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uint64_t rotr (uint64 v, uint32 k) {
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return (v >> k) | (v << (64 - k));
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}
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uint64 mul (uint64 a, uint64 b) {
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uint64 hh = (a >> 32) * (b >> 32);
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uint64 hl = (b >> 32) * static_cast <uint32> (b);
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uint64 lh = static_cast <uint32> (a) * (b >> 32);
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uint64 ll = static_cast <uint64> (static_cast <double> (a) * static_cast <double> (b));
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return rotr (hl, 32) ^ rotr (lh, 32) ^ hh ^ ll;
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}
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public:
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template <typename U, typename Void = void> U get (U, U) = delete;
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template <typename Void = void> int32 get (int32 low, int32 high) {
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return static_cast <int32> (wyrand32 () * (static_cast <double> (high) - static_cast <double> (low) + 1.0) / div_ + static_cast <double> (low));
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}
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template <typename Void = void> float get (float low, float high) {
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return static_cast <float> (wyrand32 () * (static_cast <double> (high) - static_cast <double> (low)) / (div_ - 1) + static_cast <double> (low));
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}
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public:
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bool chance (int32 limit) {
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return get <int32> (0, 100) < limit;
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}
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};
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// expose global random generator
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CR_EXPOSE_GLOBAL_SINGLETON (Random, rg);
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CR_NAMESPACE_END
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