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authorMike Buland <eichlan@xagasoft.com>2012-05-04 18:44:53 +0000
committerMike Buland <eichlan@xagasoft.com>2012-05-04 18:44:53 +0000
commit55431ec82f1db436938125d9d6169aab79cbd3d3 (patch)
treeaf9c31eff2a44efacded45dca5bcb027ffbe743d /src
parent3e3f79bc35d94fab81cb31e42d8699a7eee102a4 (diff)
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Two basic random number generators, Cmwc is supposed to be a pretty good one.
I need to get the base class and singleton interface in place.
Diffstat (limited to 'src')
-rw-r--r--src/experimental/randombasic.cpp20
-rw-r--r--src/experimental/randombasic.h6
-rw-r--r--src/experimental/randomcmwc.cpp52
-rw-r--r--src/experimental/randomcmwc.h29
4 files changed, 104 insertions, 3 deletions
diff --git a/src/experimental/randombasic.cpp b/src/experimental/randombasic.cpp
index 03bf7fe..ac591be 100644
--- a/src/experimental/randombasic.cpp
+++ b/src/experimental/randombasic.cpp
@@ -8,8 +8,24 @@
8#include "bu/randombasic.h" 8#include "bu/randombasic.h"
9 9
10Bu::RandomBasic::RandomBasic() : 10Bu::RandomBasic::RandomBasic() :
11 c( 6364136223846793005 ), 11 a( 6364136223846793005 ),
12 m( 1442695040888963407 ) 12 c( 1442695040888963407 ),
13 x( 0 )
13{ 14{
14} 15}
15 16
17Bu::RandomBasic::~RandomBasic()
18{
19}
20
21void Bu::RandomBasic::seed( int32_t iSeed )
22{
23 c = iSeed;
24}
25
26int32_t Bu::RandomBasic::rand()
27{
28 x = (a*x + c);
29 return (int32_t)x;
30}
31
diff --git a/src/experimental/randombasic.h b/src/experimental/randombasic.h
index 2ba7bd3..6eab9dc 100644
--- a/src/experimental/randombasic.h
+++ b/src/experimental/randombasic.h
@@ -17,8 +17,12 @@ namespace Bu
17 RandomBasic(); 17 RandomBasic();
18 virtual ~RandomBasic(); 18 virtual ~RandomBasic();
19 19
20 void seed( int32_t iSeed );
21
22 int32_t rand();
23
20 private: 24 private:
21 int64_t c, m, a; 25 int64_t a, c, x;
22 }; 26 };
23}; 27};
24 28
diff --git a/src/experimental/randomcmwc.cpp b/src/experimental/randomcmwc.cpp
new file mode 100644
index 0000000..97f7262
--- /dev/null
+++ b/src/experimental/randomcmwc.cpp
@@ -0,0 +1,52 @@
1/*
2 * Copyright (C) 2007-2012 Xagasoft, All rights reserved.
3 *
4 * This file is part of the libbu++ library and is released under the
5 * terms of the license contained in the file LICENSE.
6 */
7
8#include "bu/randomcmwc.h"
9
10#define PHI 0x9e3779b9
11
12RandomCmwc::RandomCmwc() :
13 q( NULL ),
14 c( 362436 )
15{
16 q = new uint32_t[4096];
17}
18
19RandomCmwc::~RandomCmwc()
20{
21 delete[] q;
22}
23
24void RandomCmwc::seed( int32_t iSeed )
25{
26 int i;
27
28 Q[0] = iSeed;
29 Q[1] = iSeed + PHI;
30 Q[2] = iSeed + PHI + PHI;
31
32 for (i = 3; i < 4096; i++)
33 Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i;
34}
35
36int32_t RandomCmwc::rand()
37{
38 uint64_t t, a = 18782LL;
39 static uint32_t i = 4095;
40 uint32_t x, r = 0xfffffffe;
41 i = (i + 1) & 4095;
42 t = a * Q[i] + c;
43 c = (t >> 32);
44 x = t + c;
45 if( x < c )
46 {
47 x++;
48 c++;
49 }
50 return (Q[i] = r - x);
51}
52
diff --git a/src/experimental/randomcmwc.h b/src/experimental/randomcmwc.h
new file mode 100644
index 0000000..3a05383
--- /dev/null
+++ b/src/experimental/randomcmwc.h
@@ -0,0 +1,29 @@
1/*
2 * Copyright (C) 2007-2012 Xagasoft, All rights reserved.
3 *
4 * This file is part of the libbu++ library and is released under the
5 * terms of the license contained in the file LICENSE.
6 */
7#ifndef BU_RANDOM_CMWC_H
8#define BU_RANDOM_CMWC_H
9
10#include <stdint.h>
11
12namespace Bu
13{
14 class RandomCmwc
15 {
16 public:
17 RandomCmwc();
18 virtual ~RandomCmwc();
19
20 void seed( int32_t iSeed );
21
22 int32_t rand();
23
24 private:
25 uint32_t *q, c;
26 };
27};
28
29#endif