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54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
/********************************************************************
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Minecraft: Pocket Edition - Decompilation Project
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Copyright (C) 2023 iProgramInCpp
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The following code is licensed under the BSD 1 clause license.
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SPDX-License-Identifier: BSD-1-Clause
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********************************************************************/
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#pragma once
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#include <cstdint>
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// This appears to be VERY similar to https://github.com/SethRobinson/proton/blob/master/shared/util/CRandom.h#L10
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// It turns out, RTsoft, Mojang, and the author of Game Coding Complete used the same reference implementation of
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// the Mersenne Twister:
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// http://www.math.sci.hiroshima-u.ac.jp/m-mat/MT/MT2002/CODES/mt19937ar.c
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//A random generator based on the Mersenne Twister originally developed by Takuji Nishimura and Makoto Matsumoto.
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// From the book GameCoding Complete by Mike McShaffry
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/* Period parameters */
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#define CMATH_N 624
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#define CMATH_M 397
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#define CMATH_MATRIX_A 0x9908b0df /* constant vector a */
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#define CMATH_UPPER_MASK 0x80000000 /* most significant w-r bits */
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#define CMATH_LOWER_MASK 0x7fffffff /* least significant r bits */
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/* Tempering parameters */
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#define CMATH_TEMPERING_MASK_B 0x9d2c5680
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#define CMATH_TEMPERING_MASK_C 0xefc60000
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#define CMATH_TEMPERING_SHIFT_U(y) (y >> 11)
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#define CMATH_TEMPERING_SHIFT_S(y) (y << 7)
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#define CMATH_TEMPERING_SHIFT_T(y) (y << 15)
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#define CMATH_TEMPERING_SHIFT_L(y) (y >> 18)
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int getTimeMs();
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class Random
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{
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unsigned int rseed;
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unsigned long mt[CMATH_N]; // the array for the state vector
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int mti; // mti==N+1 means mt[N] is not initialized
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public:
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Random(long seed = getTimeMs());
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void setSeed(long seed);
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void init_genrand(unsigned long);
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int nextInt(int max);
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unsigned genrand_int32();
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float nextFloat();
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double genrand_real2();
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long nextLong();
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int nextInt();
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};
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