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Diffstat (limited to 'libraries/ode-0.9/ode/src/misc.cpp')
-rw-r--r-- | libraries/ode-0.9/ode/src/misc.cpp | 169 |
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diff --git a/libraries/ode-0.9/ode/src/misc.cpp b/libraries/ode-0.9/ode/src/misc.cpp deleted file mode 100644 index 1a6f263..0000000 --- a/libraries/ode-0.9/ode/src/misc.cpp +++ /dev/null | |||
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1 | /************************************************************************* | ||
2 | * * | ||
3 | * Open Dynamics Engine, Copyright (C) 2001,2002 Russell L. Smith. * | ||
4 | * All rights reserved. Email: russ@q12.org Web: www.q12.org * | ||
5 | * * | ||
6 | * This library is free software; you can redistribute it and/or * | ||
7 | * modify it under the terms of EITHER: * | ||
8 | * (1) The GNU Lesser General Public License as published by the Free * | ||
9 | * Software Foundation; either version 2.1 of the License, or (at * | ||
10 | * your option) any later version. The text of the GNU Lesser * | ||
11 | * General Public License is included with this library in the * | ||
12 | * file LICENSE.TXT. * | ||
13 | * (2) The BSD-style license that is included with this library in * | ||
14 | * the file LICENSE-BSD.TXT. * | ||
15 | * * | ||
16 | * This library is distributed in the hope that it will be useful, * | ||
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | ||
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files * | ||
19 | * LICENSE.TXT and LICENSE-BSD.TXT for more details. * | ||
20 | * * | ||
21 | *************************************************************************/ | ||
22 | |||
23 | #include <ode/config.h> | ||
24 | #include <ode/misc.h> | ||
25 | #include <ode/matrix.h> | ||
26 | |||
27 | //**************************************************************************** | ||
28 | // random numbers | ||
29 | |||
30 | static unsigned long seed = 0; | ||
31 | |||
32 | unsigned long dRand() | ||
33 | { | ||
34 | seed = (1664525L*seed + 1013904223L) & 0xffffffff; | ||
35 | return seed; | ||
36 | } | ||
37 | |||
38 | |||
39 | unsigned long dRandGetSeed() | ||
40 | { | ||
41 | return seed; | ||
42 | } | ||
43 | |||
44 | |||
45 | void dRandSetSeed (unsigned long s) | ||
46 | { | ||
47 | seed = s; | ||
48 | } | ||
49 | |||
50 | |||
51 | int dTestRand() | ||
52 | { | ||
53 | unsigned long oldseed = seed; | ||
54 | int ret = 1; | ||
55 | seed = 0; | ||
56 | if (dRand() != 0x3c6ef35f || dRand() != 0x47502932 || | ||
57 | dRand() != 0xd1ccf6e9 || dRand() != 0xaaf95334 || | ||
58 | dRand() != 0x6252e503) ret = 0; | ||
59 | seed = oldseed; | ||
60 | return ret; | ||
61 | } | ||
62 | |||
63 | |||
64 | // adam's all-int straightforward(?) dRandInt (0..n-1) | ||
65 | int dRandInt (int n) | ||
66 | { | ||
67 | // seems good; xor-fold and modulus | ||
68 | const unsigned long un = n; | ||
69 | unsigned long r = dRand(); | ||
70 | |||
71 | // note: probably more aggressive than it needs to be -- might be | ||
72 | // able to get away without one or two of the innermost branches. | ||
73 | if (un <= 0x00010000UL) { | ||
74 | r ^= (r >> 16); | ||
75 | if (un <= 0x00000100UL) { | ||
76 | r ^= (r >> 8); | ||
77 | if (un <= 0x00000010UL) { | ||
78 | r ^= (r >> 4); | ||
79 | if (un <= 0x00000004UL) { | ||
80 | r ^= (r >> 2); | ||
81 | if (un <= 0x00000002UL) { | ||
82 | r ^= (r >> 1); | ||
83 | } | ||
84 | } | ||
85 | } | ||
86 | } | ||
87 | } | ||
88 | |||
89 | return (int) (r % un); | ||
90 | } | ||
91 | |||
92 | |||
93 | dReal dRandReal() | ||
94 | { | ||
95 | return ((dReal) dRand()) / ((dReal) 0xffffffff); | ||
96 | } | ||
97 | |||
98 | //**************************************************************************** | ||
99 | // matrix utility stuff | ||
100 | |||
101 | void dPrintMatrix (const dReal *A, int n, int m, char *fmt, FILE *f) | ||
102 | { | ||
103 | int i,j; | ||
104 | int skip = dPAD(m); | ||
105 | for (i=0; i<n; i++) { | ||
106 | for (j=0; j<m; j++) fprintf (f,fmt,A[i*skip+j]); | ||
107 | fprintf (f,"\n"); | ||
108 | } | ||
109 | } | ||
110 | |||
111 | |||
112 | void dMakeRandomVector (dReal *A, int n, dReal range) | ||
113 | { | ||
114 | int i; | ||
115 | for (i=0; i<n; i++) A[i] = (dRandReal()*REAL(2.0)-REAL(1.0))*range; | ||
116 | } | ||
117 | |||
118 | |||
119 | void dMakeRandomMatrix (dReal *A, int n, int m, dReal range) | ||
120 | { | ||
121 | int i,j; | ||
122 | int skip = dPAD(m); | ||
123 | dSetZero (A,n*skip); | ||
124 | for (i=0; i<n; i++) { | ||
125 | for (j=0; j<m; j++) A[i*skip+j] = (dRandReal()*REAL(2.0)-REAL(1.0))*range; | ||
126 | } | ||
127 | } | ||
128 | |||
129 | |||
130 | void dClearUpperTriangle (dReal *A, int n) | ||
131 | { | ||
132 | int i,j; | ||
133 | int skip = dPAD(n); | ||
134 | for (i=0; i<n; i++) { | ||
135 | for (j=i+1; j<n; j++) A[i*skip+j] = 0; | ||
136 | } | ||
137 | } | ||
138 | |||
139 | |||
140 | dReal dMaxDifference (const dReal *A, const dReal *B, int n, int m) | ||
141 | { | ||
142 | int i,j; | ||
143 | int skip = dPAD(m); | ||
144 | dReal diff,max; | ||
145 | max = 0; | ||
146 | for (i=0; i<n; i++) { | ||
147 | for (j=0; j<m; j++) { | ||
148 | diff = dFabs(A[i*skip+j] - B[i*skip+j]); | ||
149 | if (diff > max) max = diff; | ||
150 | } | ||
151 | } | ||
152 | return max; | ||
153 | } | ||
154 | |||
155 | |||
156 | dReal dMaxDifferenceLowerTriangle (const dReal *A, const dReal *B, int n) | ||
157 | { | ||
158 | int i,j; | ||
159 | int skip = dPAD(n); | ||
160 | dReal diff,max; | ||
161 | max = 0; | ||
162 | for (i=0; i<n; i++) { | ||
163 | for (j=0; j<=i; j++) { | ||
164 | diff = dFabs(A[i*skip+j] - B[i*skip+j]); | ||
165 | if (diff > max) max = diff; | ||
166 | } | ||
167 | } | ||
168 | return max; | ||
169 | } | ||