53 lines
2.1 KiB
C++
53 lines
2.1 KiB
C++
/*
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This file is part of Warzone 2100.
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Copyright (C) 1999-2004 Eidos Interactive
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Copyright (C) 2005-2013 Warzone 2100 Project
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Warzone 2100 is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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Warzone 2100 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Warzone 2100; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _RAND_H_
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#define _RAND_H_
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#include "lib/framework/types.h"
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// Pseudorandom number generator with 19937 bit state and period of 2**19937 - 1. Equidistributed in up to 623 dimensions.
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// See http://en.wikipedia.org/wiki/Mersenne_twister
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// If all clients use the same seed, they will generate the same pseudorandom number sequence.
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class MersenneTwister
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{
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public:
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MersenneTwister(uint32_t seed = 42);
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uint32_t u32(); ///< Generates a random number in the interval [0...UINT32_MAX].
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private:
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void generate(); ///< Generates more random numbers.
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int offset; ///< Index in state.
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uint32_t state[624]; ///< 19937 bit state, rounded up to next 32 bits.
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};
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/// Seeds the random number generator. The seed is sent over the network, such that all clients generate the same number sequence, without the number sequence being the same each game.
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void gameSRand(uint32_t seed);
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/// Generates a random number in the interval [0...UINT32_MAX].
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/// Must not be called from graphics routines, only for making game decisions.
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uint32_t gameRandU32(void);
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/// Generates a random number in the interval [0...limit - 1]. Not equidistributed for large non-powers of 2.
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/// Must not be called from graphics routines, only for making game decisions.
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int32_t gameRand(uint32_t limit);
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#endif //_RAND_H_
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