diff options
Diffstat (limited to 'src/core')
| -rw-r--r-- | src/core/random_func.cpp | 100 | ||||
| -rw-r--r-- | src/core/random_func.hpp | 4 |
2 files changed, 1 insertions, 103 deletions
diff --git a/src/core/random_func.cpp b/src/core/random_func.cpp index 56792ca63..d51e59eeb 100644 --- a/src/core/random_func.cpp +++ b/src/core/random_func.cpp @@ -28,101 +28,6 @@ void Randomizer::SetSeed(uint32 seed) this->state[1] = seed; } -#ifdef MERSENNE_TWISTER -// Source code for Mersenne Twister. -// A Random number generator with much higher quality random numbers. - -#define N (624) // length of _mt_state vector -#define M (397) // a period parameter -#define K (0x9908B0DFU) // a magic constant -#define hiBit(u) ((u) & 0x80000000U) // mask all but highest bit of u -#define loBit(u) ((u) & 0x00000001U) // mask all but lowest bit of u -#define loBits(u) ((u) & 0x7FFFFFFFU) // mask the highest bit of u -#define mixBits(u, v) (hiBit(u)|loBits(v)) // move hi bit of u to hi bit of v - -static uint32 _mt_state[N+1]; // _mt_state vector + 1 extra to not violate ANSI C -static uint32 *_mt_next; // _mt_next random value is computed from here -static int _mt_left = -1; // can *_mt_next++ this many times before reloading - -void SetRandomSeed(register uint32 seed) -{ - register uint32 *s = _mt_state; - _mt_left = 0; - - seed |= 1U; - seed &= 0xFFFFFFFFU; - - *s = seed; - - for (register uint i = N; i != 0; i--) { - seed *= 69069U; - *s++; - *s = seed & 0xFFFFFFFFU; - } -} - -static uint32 ReloadRandom() -{ - if (_mt_left < -1) SetRandomSeed(4357U); - - _mt_left = N - 1; - _mt_next = _mt_state + 1; - - register uint32 *p0 = _mt_state; - register uint32 *p2 = _mt_state + 2; - register uint32 *pM = _mt_state + M; - - register uint32 s0 = _mt_state[0]; - register uint32 s1 = _mt_state[1]; - - register uint i = 0; - - for (i = (N - M + 1); i != 0; i--) { - s0 = s1; - s1 = *p2; - *p0 = *pM ^ (mixBits(s0, s1) >> 1) ^ (loBit(s1) ? K : 0U); - *p0++; - *p2++; - *pM++; - } - - pM = _mt_state; - - for (i = M; i != 0; i--) { - s0 = s1; - s1 = *p2; - *p0 = *pM ^ (mixBits(s0, s1) >> 1) ^ (loBit(s1) ? K : 0U); - *p0++; - *p2++; - *pM++; - } - - s1 = _mt_state[0]; - *p0 = *pM ^ (mixBits(s0, s1) >> 1) ^ (loBit(s1) ? K : 0U); - - s1 ^= (s1 >> 11); - s1 ^= (s1 << 7) & 0x9D2C5680U; - s1 ^= (s1 << 15) & 0xEFC60000U; - s1 ^= (s1 >> 18); - return s1; -} - -uint32 Random() -{ - _mt_left--; - if (_mt_left < 0) return ReloadRandom(); - - uint32 y = *_mt_next; - *_mt_next++; - - y ^= (y >> 11); - y ^= (y << 7) & 0x9D2C5680U; - y ^= (y << 15) & 0xEFC60000U; - y ^= (y >> 18); - return y; -} - -#else /* MERSENNE_TWISTER */ void SetRandomSeed(uint32 seed) { _random.SetSeed(seed); @@ -142,12 +47,9 @@ uint32 DoRandom(int line, const char *file) return _random.Next(); } -#endif /* RANDOM_DEBUG */ -#endif /* MERSENNE_TWISTER */ -#if defined(RANDOM_DEBUG) && !defined(MERSENNE_TWISTER) uint DoRandomRange(uint max, int line, const char *file) { return GB(DoRandom(line, file), 0, 16) * max >> 16; } -#endif /* RANDOM_DEBUG & !MERSENNE_TWISTER */ +#endif /* RANDOM_DEBUG */ diff --git a/src/core/random_func.hpp b/src/core/random_func.hpp index 8469af661..a301b5b3b 100644 --- a/src/core/random_func.hpp +++ b/src/core/random_func.hpp @@ -23,10 +23,6 @@ //#define RANDOM_DEBUG -// Enable this to produce higher quality random numbers. -// Doesn't work with network yet. -// #define MERSENNE_TWISTER - /** * Structure to encapsulate the pseudo random number generators. */ |