author | skidd13 |
Wed, 21 Nov 2007 19:18:34 +0000 | |
changeset 7936 | 3df083e704f2 |
parent 7935 | c2d1b2f4ecd6 |
child 8079 | 8ed263cb705a |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file random_func.cpp */ |
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#include "../stdafx.h" |
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#include "../macros.h" |
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#include "../variables.h" |
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#include "random_func.hpp" |
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uint32 InteractiveRandom() |
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{ |
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const uint32 s = _random_seeds[1][0]; |
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const uint32 t = _random_seeds[1][1]; |
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_random_seeds[1][0] = s + ROR(t ^ 0x1234567F, 7) + 1; |
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return _random_seeds[1][1] = ROR(s, 3) - 1; |
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} |
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uint InteractiveRandomRange(uint max) |
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{ |
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return GB(InteractiveRandom(), 0, 16) * max >> 16; |
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} |
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#ifdef MERSENNE_TWISTER |
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// Source code for Mersenne Twister. |
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// A Random number generator with much higher quality random numbers. |
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#define N (624) // length of _mt_state vector |
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#define M (397) // a period parameter |
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#define K (0x9908B0DFU) // a magic constant |
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#define hiBit(u) ((u) & 0x80000000U) // mask all but highest bit of u |
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#define loBit(u) ((u) & 0x00000001U) // mask all but lowest bit of u |
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#define loBits(u) ((u) & 0x7FFFFFFFU) // mask the highest bit of u |
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#define mixBits(u, v) (hiBit(u)|loBits(v)) // move hi bit of u to hi bit of v |
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static uint32 _mt_state[N+1]; // _mt_state vector + 1 extra to not violate ANSI C |
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static uint32 *_mt_next; // _mt_next random value is computed from here |
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static int _mt_left = -1; // can *_mt_next++ this many times before reloading |
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void SetRandomSeed(register uint32 seed) |
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{ |
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register uint32 *s = _mt_state; |
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_mt_left = 0; |
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seed |= 1U; |
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seed &= 0xFFFFFFFFU; |
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*s = seed; |
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for (register uint i = N; i != 0; i--) { |
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seed *= 69069U; |
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*s++; |
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*s = seed & 0xFFFFFFFFU; |
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} |
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} |
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static uint32 ReloadRandom() |
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{ |
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if (_mt_left < -1) SetRandomSeed(4357U); |
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_mt_left = N - 1; |
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_mt_next = _mt_state + 1; |
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register uint32 *p0 = _mt_state; |
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register uint32 *p2 = _mt_state + 2; |
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register uint32 *pM = _mt_state + M; |
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register uint32 s0 = _mt_state[0]; |
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register uint32 s1 = _mt_state[1]; |
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register uint i = 0; |
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for (i = (N - M + 1); i != 0; i--) { |
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s0 = s1; |
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s1 = *p2; |
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*p0 = *pM ^ (mixBits(s0, s1) >> 1) ^ (loBit(s1) ? K : 0U); |
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*p0++; |
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*p2++; |
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*pM++; |
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} |
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pM = _mt_state; |
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for (i = M; i != 0; i--) { |
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s0 = s1; |
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s1 = *p2; |
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*p0 = *pM ^ (mixBits(s0, s1) >> 1) ^ (loBit(s1) ? K : 0U); |
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*p0++; |
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*p2++; |
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*pM++; |
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} |
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s1 = _mt_state[0]; |
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*p0 = *pM ^ (mixBits(s0, s1) >> 1) ^ (loBit(s1) ? K : 0U); |
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s1 ^= (s1 >> 11); |
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s1 ^= (s1 << 7) & 0x9D2C5680U; |
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s1 ^= (s1 << 15) & 0xEFC60000U; |
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s1 ^= (s1 >> 18); |
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return s1; |
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} |
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uint32 Random() |
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{ |
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_mt_left--; |
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if (_mt_left < 0) return ReloadRandom(); |
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uint32 y = *_mt_next; |
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*_mt_next++; |
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y ^= (y >> 11); |
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y ^= (y << 7) & 0x9D2C5680U; |
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y ^= (y << 15) & 0xEFC60000U; |
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y ^= (y >> 18); |
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return y; |
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} |
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|
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#else /* MERSENNE_TWISTER */ |
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void SetRandomSeed(uint32 seed) |
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{ |
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_random_seeds[0][0] = seed; |
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_random_seeds[0][1] = seed; |
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_random_seeds[1][0] = seed * 0x1234567; |
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_random_seeds[1][1] = _random_seeds[1][0]; |
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} |
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126 |
|
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127 |
#ifdef RANDOM_DEBUG |
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#include "network/network_data.h" |
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uint32 DoRandom(int line, const char *file) |
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{ |
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if (_networking && (DEREF_CLIENT(0)->status != STATUS_INACTIVE || !_network_server)) |
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printf("Random [%d/%d] %s:%d\n",_frame_counter, (byte)_current_player, file, line); |
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#else /* RANDOM_DEBUG */ |
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uint32 Random() |
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{ |
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#endif /* RANDOM_DEBUG */ |
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const uint32 s = _random_seeds[0][0]; |
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const uint32 t = _random_seeds[0][1]; |
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139 |
|
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_random_seeds[0][0] = s + ROR(t ^ 0x1234567F, 7) + 1; |
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return _random_seeds[0][1] = ROR(s, 3) - 1; |
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} |
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#endif /* MERSENNE_TWISTER */ |
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144 |
|
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#if defined(RANDOM_DEBUG) && !defined(MERSENNE_TWISTER) |
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uint DoRandomRange(uint max, int line, const char *file) |
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{ |
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return GB(DoRandom(line, file), 0, 16) * max >> 16; |
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} |
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#else /* RANDOM_DEBUG & !MERSENNE_TWISTER */ |
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uint RandomRange(uint max) |
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{ |
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return GB(Random(), 0, 16) * max >> 16; |
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} |
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#endif /* RANDOM_DEBUG & !MERSENNE_TWISTER */ |