* Added Mersenne Twister MT19937 as a random number generator.

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@14865 54d463be-8e91-2dee-dedb-b68131a5f0ec

3rdparty/mt19937ar/mt19937ar.c

@@ -0,0 +1,175 @@
+/* 
+   A C-program for MT19937, with initialization improved 2002/1/26.
+   Coded by Takuji Nishimura and Makoto Matsumoto.
+
+   Before using, initialize the state by using init_genrand(seed)  
+   or init_by_array(init_key, key_length).
+
+   Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
+   All rights reserved.                          
+   Copyright (C) 2005, Mutsuo Saito,
+   All rights reserved.                          
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+     1. Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+
+     2. Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in the
+        documentation and/or other materials provided with the distribution.
+
+     3. The names of its contributors may not be used to endorse or promote 
+        products derived from this software without specific prior written 
+        permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+   Any feedback is very welcome.
+   http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
+   email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
+*/
+
+#include <stdio.h>
+#include "mt19937ar.h"
+
+/* Period parameters */  
+#define N 624
+#define M 397
+#define MATRIX_A 0x9908b0dfUL   /* constant vector a */
+#define UPPER_MASK 0x80000000UL /* most significant w-r bits */
+#define LOWER_MASK 0x7fffffffUL /* least significant r bits */
+
+static unsigned long mt[N]; /* the array for the state vector  */
+static int mti=N+1; /* mti==N+1 means mt[N] is not initialized */
+
+/* initializes mt[N] with a seed */
+void init_genrand(unsigned long s)
+{
+    mt[0]= s & 0xffffffffUL;
+    for (mti=1; mti<N; mti++) {
+        mt[mti] = 
+	    (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti); 
+        /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
+        /* In the previous versions, MSBs of the seed affect   */
+        /* only MSBs of the array mt[].                        */
+        /* 2002/01/09 modified by Makoto Matsumoto             */
+        mt[mti] &= 0xffffffffUL;
+        /* for >32 bit machines */
+    }
+}
+
+/* initialize by an array with array-length */
+/* init_key is the array for initializing keys */
+/* key_length is its length */
+/* slight change for C++, 2004/2/26 */
+void init_by_array(unsigned long init_key[], int key_length)
+{
+    int i, j, k;
+    init_genrand(19650218UL);
+    i=1; j=0;
+    k = (N>key_length ? N : key_length);
+    for (; k; k--) {
+        mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL))
+          + init_key[j] + j; /* non linear */
+        mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
+        i++; j++;
+        if (i>=N) { mt[0] = mt[N-1]; i=1; }
+        if (j>=key_length) j=0;
+    }
+    for (k=N-1; k; k--) {
+        mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL))
+          - i; /* non linear */
+        mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
+        i++;
+        if (i>=N) { mt[0] = mt[N-1]; i=1; }
+    }
+
+    mt[0] = 0x80000000UL; /* MSB is 1; assuring non-zero initial array */ 
+}
+
+/* generates a random number on [0,0xffffffff]-interval */
+unsigned long genrand_int32(void)
+{
+    unsigned long y;
+    static unsigned long mag01[2]={0x0UL, MATRIX_A};
+    /* mag01[x] = x * MATRIX_A  for x=0,1 */
+
+    if (mti >= N) { /* generate N words at one time */
+        int kk;
+
+        if (mti == N+1)   /* if init_genrand() has not been called, */
+            init_genrand(5489UL); /* a default initial seed is used */
+
+        for (kk=0;kk<N-M;kk++) {
+            y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
+            mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
+        }
+        for (;kk<N-1;kk++) {
+            y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
+            mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
+        }
+        y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
+        mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
+
+        mti = 0;
+    }
+  
+    y = mt[mti++];
+
+    /* Tempering */
+    y ^= (y >> 11);
+    y ^= (y << 7) & 0x9d2c5680UL;
+    y ^= (y << 15) & 0xefc60000UL;
+    y ^= (y >> 18);
+
+    return y;
+}
+
+/* generates a random number on [0,0x7fffffff]-interval */
+long genrand_int31(void)
+{
+    return (long)(genrand_int32()>>1);
+}
+
+/* generates a random number on [0,1]-real-interval */
+double genrand_real1(void)
+{
+    return genrand_int32()*(1.0/4294967295.0); 
+    /* divided by 2^32-1 */ 
+}
+
+/* generates a random number on [0,1)-real-interval */
+double genrand_real2(void)
+{
+    return genrand_int32()*(1.0/4294967296.0); 
+    /* divided by 2^32 */
+}
+
+/* generates a random number on (0,1)-real-interval */
+double genrand_real3(void)
+{
+    return (((double)genrand_int32()) + 0.5)*(1.0/4294967296.0); 
+    /* divided by 2^32 */
+}
+
+/* generates a random number on [0,1) with 53-bit resolution*/
+double genrand_res53(void) 
+{ 
+    unsigned long a=genrand_int32()>>5, b=genrand_int32()>>6; 
+    return(a*67108864.0+b)*(1.0/9007199254740992.0); 
+} 
+/* These real versions are due to Isaku Wada, 2002/01/09 added */

3rdparty/mt19937ar/mt19937ar.h

@@ -0,0 +1,72 @@
+/* 
+   A C-program for MT19937, with initialization improved 2002/1/26.
+   Coded by Takuji Nishimura and Makoto Matsumoto.
+
+   Before using, initialize the state by using init_genrand(seed)  
+   or init_by_array(init_key, key_length).
+
+   Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
+   All rights reserved.
+   Copyright (C) 2005, Mutsuo Saito
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+     1. Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+
+     2. Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in the
+        documentation and/or other materials provided with the distribution.
+
+     3. The names of its contributors may not be used to endorse or promote 
+        products derived from this software without specific prior written 
+        permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+   Any feedback is very welcome.
+   http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
+   email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
+*/
+
+/* initializes mt[N] with a seed */
+void init_genrand(unsigned long s);
+
+/* initialize by an array with array-length */
+/* init_key is the array for initializing keys */
+/* key_length is its length */
+/* slight change for C++, 2004/2/26 */
+void init_by_array(unsigned long init_key[], int key_length);
+
+/* generates a random number on [0,0xffffffff]-interval */
+unsigned long genrand_int32(void);
+
+/* generates a random number on [0,0x7fffffff]-interval */
+long genrand_int31(void);
+
+/* These real versions are due to Isaku Wada, 2002/01/09 added */
+/* generates a random number on [0,1]-real-interval */
+double genrand_real1(void);
+
+/* generates a random number on [0,1)-real-interval */
+double genrand_real2(void);
+
+/* generates a random number on (0,1)-real-interval */
+double genrand_real3(void);
+
+/* generates a random number on [0,1) with 53-bit resolution*/
+double genrand_res53(void);

3rdparty/mt19937ar/mt19937ar.out

@@ -0,0 +1,403 @@
+1000 outputs of genrand_int32()
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+ 988064871 3515461600 4089077232 2225147448 1249609188 
+2643151863 3896204135 2416995901 1397735321 3460025646 
+
+1000 outputs of genrand_real2()
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3rdparty/mt19937ar/mtTest.c

@@ -0,0 +1,65 @@
+/* 
+   A C-program for MT19937, with initialization improved 2002/1/26.
+   Coded by Takuji Nishimura and Makoto Matsumoto.
+
+   Before using, initialize the state by using init_genrand(seed)  
+   or init_by_array(init_key, key_length).
+
+   Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
+   All rights reserved.
+   Copyright (C) 2005, Mutsuo Saito,
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+     1. Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+
+     2. Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in the
+        documentation and/or other materials provided with the distribution.
+
+     3. The names of its contributors may not be used to endorse or promote 
+        products derived from this software without specific prior written 
+        permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+   Any feedback is very welcome.
+   http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
+   email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
+*/
+
+#include <stdio.h>
+#include "mt19937ar.h"
+
+int main(void)
+{
+    int i;
+    unsigned long init[4]={0x123, 0x234, 0x345, 0x456}, length=4;
+    init_by_array(init, length);
+    printf("1000 outputs of genrand_int32()\n");
+    for (i=0; i<1000; i++) {
+      printf("%10lu ", genrand_int32());
+      if (i%5==4) printf("\n");
+    }
+    printf("\n1000 outputs of genrand_real2()\n");
+    for (i=0; i<1000; i++) {
+      printf("%10.8f ", genrand_real2());
+      if (i%5==4) printf("\n");
+    }
+    return 0;
+}

3rdparty/mt19937ar/readme-mt.txt

@@ -0,0 +1,79 @@
+This is a Mersenne Twister pseudorandom number generator
+with period 2^19937-1 with improved initialization scheme,
+modified on 2002/1/26 by Takuji Nishimura and Makoto Matsumoto. 
+modified on 2005/4/26 by Mutsuo Saito
+
+Contents of this tar ball:
+readme-mt.txt	 this file
+mt19937ar.c	 the C source (ar: initialize by ARray)
+mt19937ar.h      the C header file for mt19937ar
+mtTest.c         the C test main program of mt19937ar.c
+mt19937ar.out	 Test outputs of six types generators. 1000 for each
+
+1. Initialization
+  The initialization scheme for the previous versions of MT
+(e.g. 1999/10/28 version or earlier) has a tiny problem, that
+the most significant bits of the seed is not well reflected 
+to the state vector of MT.
+
+This version (2002/1/26) has two initialization schemes:
+init_genrand(seed) and init_by_array(init_key, key_length).
+
+init_genrand(seed) initializes the state vector by using
+one unsigned 32-bit integer "seed", which may be zero.
+
+init_by_array(init_key, key_length) initializes the state vector 
+by using an array init_key[] of unsigned 32-bit integers
+of length key_kength. If key_length is smaller than 624,
+then each array of 32-bit integers gives distinct initial
+state vector. This is useful if you want a larger seed space
+than 32-bit word.
+
+2. Generation
+After initialization, the following type of pseudorandom numbers
+are available. 
+
+genrand_int32() generates unsigned 32-bit integers.
+genrand_int31() generates unsigned 31-bit integers.
+genrand_real1() generates uniform real in [0,1] (32-bit resolution). 
+genrand_real2() generates uniform real in [0,1) (32-bit resolution). 
+genrand_real3() generates uniform real in (0,1) (32-bit resolution).
+genrand_res53() generates uniform real in [0,1) with 53-bit resolution.
+
+Note: the last five functions call the first one. 
+if you need more speed for these five functions, you may
+suppress the function call by copying genrand_int32() and
+replacing the last return(), following to these five functions.
+
+3. main()
+main() is an example to initialize with an array of length 4,
+then 1000 outputs of unsigned 32-bit integers, 
+then 1000 outputs of real [0,1) numbers. 
+
+4. The outputs
+The output of the mt19937ar.c is in the file mt19937ar.out.
+If you revise or translate the code, check the output
+by using this file. 
+
+5. Cryptography
+This generator is not cryptoraphically secure. 
+You need to use a one-way (or hash) function to obtain 
+a secure random sequence.
+
+6. Correspondence
+See:
+URL http://www.math.keio.ac.jp/matumoto/emt.html
+email matumoto@math.keio.ac.jp, nisimura@sci.kj.yamagata-u.ac.jp
+
+7. Reference
+M. Matsumoto and T. Nishimura,
+"Mersenne Twister: A 623-Dimensionally Equidistributed Uniform  
+Pseudo-Random Number Generator",
+ACM Transactions on Modeling and Computer Simulation,
+Vol. 8, No. 1, January 1998, pp 3--30.
+
+-------
+Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
+All rights reserved.
+Copyright (C) 2005, Mutsuo Saito
+All rights reserved.

Changelog-Trunk.txt

@@ -1,5 +1,7 @@
 Date	Added
 
+2011/06/25
+	* Added Mersenne Twister MT19937 as a random number generator. [FlavioJS]
 2011/06/23
 	* Made chrif_save always call pc_makesavestatus. (no reason to prevent the call, and was interfering with multi map-server; fixes bugreport:1400) [FlavioJS]
 2011/06/22

src/common/random.c

@@ -0,0 +1,83 @@
+// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
+// For more information, see LICENCE in the main folder
+
+#include "../common/timer.h" // gettick
+#include "random.h"
+#if defined(WIN32)
+	#define WIN32_LEAN_AND_MEAN
+	#include <windows.h>
+#elif defined(HAVE_GETPID) || defined(HAVE_GETTID)
+	#include <sys/types.h>
+	#include <unistd.h>
+#endif
+#include <time.h> // time
+#include <mt19937ar.h> // init_genrand, genrand_int32, genrand_res53
+
+
+/// Initializes the random number generator with an appropriate seed.
+void rnd_init(void)
+{
+	uint32 seed = gettick();
+	seed += (uint32)time(NULL);
+#if defined(WIN32)
+	seed += GetCurrentProcessId();
+	seed += GetCurrentThreadId();
+#else
+#if defined(HAVE_GETPID)
+	seed += (uint32)getpid();
+#endif // HAVE_GETPID
+#if defined(HAVE_GETTID)
+	seed += (uint32)gettid();
+#endif // HAVE_GETTID
+#endif
+	init_genrand(seed);
+}
+
+
+/// Initializes the random number generator.
+void rnd_seed(uint32 seed)
+{
+	init_genrand(seed);
+}
+
+
+/// Generates a random number in the interval [0, UINT32_MAX]
+uint32 rnd(void)
+{
+	return (uint32)genrand_int32();
+}
+
+
+/// Generates a random number in the interval [0, dice_faces)
+/// NOTE: interval is open ended, so dice_faces is excluded (unless it's 0)
+uint32 rnd_roll(uint32 dice_faces)
+{
+	return (uint32)(rnd_uniform()*dice_faces);
+}
+
+
+/// Generates a random number in the interval [min, max]
+/// Returns min if range is invalid.
+int32 rnd_value(int32 min, int32 max)
+{
+	if( min >= max )
+		return min;
+	return min + (int32)(rnd_uniform()*(max-min+1));
+}
+
+
+/// Generates a random number in the interval [0.0, 1.0)
+/// NOTE: interval is open ended, so 1.0 is excluded
+double rnd_uniform(void)
+{
+	return ((uint32)genrand_int32())*(1.0/4294967296.0);// divided by 2^32
+}
+
+
+/// Generates a random number in the interval [0.0, 1.0) with 53-bit resolution
+/// NOTE: interval is open ended, so 1.0 is excluded
+/// NOTE: 53 bits is the maximum precision of a double
+double rnd_uniform53(void)
+{
+	return genrand_res53();
+}

src/common/random.h

@@ -0,0 +1,20 @@
+// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
+// For more information, see LICENCE in the main folder
+
+#ifndef _RANDOM_H_
+#define _RANDOM_H_
+
+#ifndef _CBASETYPES_H_
+#include "../common/cbasetypes.h"
+#endif
+
+void rnd_init(void);
+void rnd_seed(uint32);
+
+uint32 rnd(void);// [0, UINT32_MAX]
+uint32 rnd_roll(uint32 dice_faces);// [0, dice_faces)
+int32 rnd_value(int32 min, int32 max);// [min, max]
+double rnd_uniform(void);// [0.0, 1.0)
+double rnd_uniform53(void);// [0.0, 1.0)
+
+#endif /* _RANDOM_H_ */