--- a/src/core/random_func.cpp Sun Apr 06 14:12:19 2008 +0000
+++ b/src/core/random_func.cpp Sun Apr 06 23:07:42 2008 +0000
@@ -28,101 +28,6 @@
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 @@
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 */