WebSVN – gelsvn – Diff – /branches/cpp11-devel/src/CGLA/CGLA.h


/* ----------------------------------------------------------------------- *
 * This file is part of GEL, http://www.imm.dtu.dk/GEL
 * Copyright (C) the authors and DTU Informatics
 * For license and list of authors, see ../../doc/intro.pdf
 * ----------------------------------------------------------------------- */
 
/** @file CGLA.h
 * @brief CGLA main header: contains a number of constants and function decs.
 */
 
#ifndef __CGLA_CGLA_H__
#define __CGLA_CGLA_H__
 
#if (_MSC_VER >= 1200)
#pragma warning (disable: 4244 4800)
#endif
 
#include <cmath>
#include <cfloat>
#include <climits>
#include <cassert>
#include <algorithm>
#include <functional>
 
#ifdef _MSC_VER // if visual studio
#include <float.h>
#endif
 
#ifndef M_PI
#define M_PI 3.14159265358979323846
#define M_PI_2 1.57079632679489661923
#endif
 
#ifndef DEGREES_TO_RADIANS
#define DEGREES_TO_RADIANS (M_PI / 180.0)
#endif
 
namespace CGLA 
{
		inline float cgla_nan() 
		{
				static const float cgla_nan_value = log(-1.0f);
				return cgla_nan_value;
		}
		
  /** Procedural definition of NAN */  
#define CGLA_NAN cgla_nan()
 
  /** NAN is used for initialization of vectors and matrices
      in debug mode */
#define CGLA_INIT_VALUE cgla_nan()
 
  /** Numerical constant representing something large.
      value is a bit arbitrary */
  const double BIG=10e+30;
 
  /** Numerical constant represents something extremely small.
      value is a bit arbitrary */
  const double MINUTE=10e-30;
 
  /** Numerical constant represents something very small.
      value is a bit arbitrary */
  const double TINY=3e-7;
	
  /** Numerical constant represents something small.
      value is a bit arbitrary */
  const double SMALL=10e-2;
 
  /** The GEL pseudo-random number generator uses
      UINT_MAX as RAND_MAX to avoid mod operations. */
  const unsigned int GEL_RAND_MAX=UINT_MAX;
 
		inline double sqrt3()
		{
				static const double sqrt3_val = sqrt(3.0);
				return sqrt3_val;
		}
 
#define SQRT3 sqrt3()
 
  /// Useful enum that represents coordiante axes.
  enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};
 
  inline bool isnan(double x) {
#ifdef _MSC_VER // if visual studio
      return _isnan(x);
#else
      return std::isnan(x);
#endif
  }
 
  /// Template for a function that squares the argument.
  template <class Scalar>
  inline Scalar sqr(Scalar x) {///
    return x*x;}
	
  /// Scalar template for a function that returns the cube of the argument.
  template <class Scalar>
  inline Scalar qbe(Scalar x) {///
    return x*x*x;}
 
  template <class Scalar>
  inline bool is_zero(Scalar x)	{return (x > -MINUTE && x < MINUTE);}
 
  template <class Scalar>
  inline bool is_tiny(Scalar x)	{return (x > -TINY && x < TINY);}
 
  /** What power of 2 ?. if x is the argument, find the largest 
      y so that 2^y <= x */
  inline int two_to_what_power(unsigned int x) 
  {
    if (x<1) 
      return -1;
    int i = 0;
    while (x != 1) {x>>=1;i++;}
    return i;
  }
 
#ifdef __sgi
  inline int round(float x) {return int(rint(x));}
#else
  inline int round(float x) {return int(x+0.5);}
#endif
 
  template<class T>
  inline T sign(T x) {return x>=T(0) ? 1 : -1;}
 
  /// Integer power function with O(log(n)) complexity
  template<class T>
  inline T int_pow(T a, unsigned int n)
  {
    T result = static_cast<T>(1);
    for(; n > 0; n >>= 1)
    {
      if(n & 1) result = result*a;
      a *= a;
    }
    return result;
  }
  
  /// Function that seeds the GEL pseudo-random number generator
  void gel_srand(unsigned int seed);
 
  /** GEL provides a linear congruential pseudo-random number 
      generator which is optimized for speed. This version allows 
      an integer argument which is useful for grid-based noise
      functions. */
  unsigned int gel_rand(unsigned int k);
 
  /** GEL provides a linear congruential pseudo-random number 
      generator which is optimized for speed. This means
      that GEL_RAND_MAX==UINT_MAX. */
  unsigned int gel_rand();
 
	/** raw_assign takes a CGLA vector, matrix or whatever has a get() function
			as its first argument and a raw pointer to a (presumed scalar) entity 
			as the second argument. the contents dereferenced by the pointer is 
			copied to the entity given as first argument. */
  template<class T, class S>
  void raw_assign(T& a,  const S* b)
  {
    memcpy(static_cast<void*>(a.get()),static_cast<const void*>(b),sizeof(T));
  }
	
}
 
#endif
 

Rev 632	Rev 639
1	`/* ----------------------------------------------------------------------- *`	1	`/* ----------------------------------------------------------------------- *`
2	`* This file is part of GEL, http://www.imm.dtu.dk/GEL`	2	`* This file is part of GEL, http://www.imm.dtu.dk/GEL`
3	`* Copyright (C) the authors and DTU Informatics`	3	`* Copyright (C) the authors and DTU Informatics`
4	`* For license and list of authors, see ../../doc/intro.pdf`	4	`* For license and list of authors, see ../../doc/intro.pdf`
5	`* ----------------------------------------------------------------------- */`	5	`* ----------------------------------------------------------------------- */`
6		6
7	`/** @file CGLA.h`	7	`/** @file CGLA.h`
8	`* @brief CGLA main header: contains a number of constants and function decs.`	8	`* @brief CGLA main header: contains a number of constants and function decs.`
9	`*/`	9	`*/`
10		10
11	`#ifndef __CGLA_CGLA_H__`	11	`#ifndef __CGLA_CGLA_H__`
12	`#define __CGLA_CGLA_H__`	12	`#define __CGLA_CGLA_H__`
13		13
14	`#if (_MSC_VER >= 1200)`	14	`#if (_MSC_VER >= 1200)`
15	`#pragma warning (disable: 4244 4800)`	15	`#pragma warning (disable: 4244 4800)`
16	`#endif`	16	`#endif`
17		17
18	`#include <cmath>`	18	`#include <cmath>`
19	`#include <cfloat>`	19	`#include <cfloat>`
20	`#include <climits>`	20	`#include <climits>`
21	`#include <cassert>`	21	`#include <cassert>`
22	`#include <algorithm>`	22	`#include <algorithm>`
23	`#include <functional>`	23	`#include <functional>`
24		24
-		25	`#ifdef _MSC_VER // if visual studio`
-		26	`#include <float.h>`
-		27	`#endif`
-		28
25	`#ifndef M_PI`	29	`#ifndef M_PI`
26	`#define M_PI 3.14159265358979323846`	30	`#define M_PI 3.14159265358979323846`
27	`#define M_PI_2 1.57079632679489661923`	31	`#define M_PI_2 1.57079632679489661923`
28	`#endif`	32	`#endif`
29		33
30	`#ifndef DEGREES_TO_RADIANS`	34	`#ifndef DEGREES_TO_RADIANS`
31	`#define DEGREES_TO_RADIANS (M_PI / 180.0)`	35	`#define DEGREES_TO_RADIANS (M_PI / 180.0)`
32	`#endif`	36	`#endif`
33		37
34	`namespace CGLA`	38	`namespace CGLA`
35	`{`	39	`{`
36	`inline float cgla_nan()`	40	`inline float cgla_nan()`
37	`{`	41	`{`
38	`static const float cgla_nan_value = log(-1.0f);`	42	`static const float cgla_nan_value = log(-1.0f);`
39	`return cgla_nan_value;`	43	`return cgla_nan_value;`
40	`}`	44	`}`
41		45
42	`/** Procedural definition of NAN */`	46	`/** Procedural definition of NAN */`
43	`#define CGLA_NAN cgla_nan()`	47	`#define CGLA_NAN cgla_nan()`
44		48
45	`/** NAN is used for initialization of vectors and matrices`	49	`/** NAN is used for initialization of vectors and matrices`
46	`in debug mode */`	50	`in debug mode */`
47	`#define CGLA_INIT_VALUE cgla_nan()`	51	`#define CGLA_INIT_VALUE cgla_nan()`
48		52
49	`/** Numerical constant representing something large.`	53	`/** Numerical constant representing something large.`
50	`value is a bit arbitrary */`	54	`value is a bit arbitrary */`
51	`const double BIG=10e+30;`	55	`const double BIG=10e+30;`
52		56
53	`/** Numerical constant represents something extremely small.`	57	`/** Numerical constant represents something extremely small.`
54	`value is a bit arbitrary */`	58	`value is a bit arbitrary */`
55	`const double MINUTE=10e-30;`	59	`const double MINUTE=10e-30;`
56		60
57	`/** Numerical constant represents something very small.`	61	`/** Numerical constant represents something very small.`
58	`value is a bit arbitrary */`	62	`value is a bit arbitrary */`
59	`const double TINY=3e-7;`	63	`const double TINY=3e-7;`
60		64
61	`/** Numerical constant represents something small.`	65	`/** Numerical constant represents something small.`
62	`value is a bit arbitrary */`	66	`value is a bit arbitrary */`
63	`const double SMALL=10e-2;`	67	`const double SMALL=10e-2;`
64		68
65	`/** The GEL pseudo-random number generator uses`	69	`/** The GEL pseudo-random number generator uses`
66	`UINT_MAX as RAND_MAX to avoid mod operations. */`	70	`UINT_MAX as RAND_MAX to avoid mod operations. */`
67	`const unsigned int GEL_RAND_MAX=UINT_MAX;`	71	`const unsigned int GEL_RAND_MAX=UINT_MAX;`
68		72
69	`inline double sqrt3()`	73	`inline double sqrt3()`
70	`{`	74	`{`
71	`static const double sqrt3_val = sqrt(3.0);`	75	`static const double sqrt3_val = sqrt(3.0);`
72	`return sqrt3_val;`	76	`return sqrt3_val;`
73	`}`	77	`}`
74		78
75	`#define SQRT3 sqrt3()`	79	`#define SQRT3 sqrt3()`
76		80
77	`/// Useful enum that represents coordiante axes.`	81	`/// Useful enum that represents coordiante axes.`
78	`enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};`	82	`enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};`
79		83
80	`inline bool isnan(double x) { return x != x; }`	84	`inline bool isnan(double x) {`
-		85	`#ifdef _MSC_VER // if visual studio`
-		86	`return _isnan(x);`
-		87	`#else`
-		88	`return std::isnan(x);`
-		89	`#endif`
-		90	`}`
81		91
82	`/// Template for a function that squares the argument.`	92	`/// Template for a function that squares the argument.`
83	`template <class Scalar>`	93	`template <class Scalar>`
84	`inline Scalar sqr(Scalar x) {///`	94	`inline Scalar sqr(Scalar x) {///`
85	`return x*x;}`	95	`return x*x;}`
86		96
87	`/// Scalar template for a function that returns the cube of the argument.`	97	`/// Scalar template for a function that returns the cube of the argument.`
88	`template <class Scalar>`	98	`template <class Scalar>`
89	`inline Scalar qbe(Scalar x) {///`	99	`inline Scalar qbe(Scalar x) {///`
90	`return xxx;}`	100	`return xxx;}`
91		101
92	`template <class Scalar>`	102	`template <class Scalar>`
93	`inline bool is_zero(Scalar x) {return (x > -MINUTE && x < MINUTE);}`	103	`inline bool is_zero(Scalar x) {return (x > -MINUTE && x < MINUTE);}`
94		104
95	`template <class Scalar>`	105	`template <class Scalar>`
96	`inline bool is_tiny(Scalar x) {return (x > -TINY && x < TINY);}`	106	`inline bool is_tiny(Scalar x) {return (x > -TINY && x < TINY);}`
97		107
98	`/** What power of 2 ?. if x is the argument, find the largest`	108	`/** What power of 2 ?. if x is the argument, find the largest`
99	`y so that 2^y <= x */`	109	`y so that 2^y <= x */`
100	`inline int two_to_what_power(unsigned int x)`	110	`inline int two_to_what_power(unsigned int x)`
101	`{`	111	`{`
102	`if (x<1)`	112	`if (x<1)`
103	`return -1;`	113	`return -1;`
104	`int i = 0;`	114	`int i = 0;`
105	`while (x != 1) {x>>=1;i++;}`	115	`while (x != 1) {x>>=1;i++;}`
106	`return i;`	116	`return i;`
107	`}`	117	`}`
108		118
109	`#ifdef __sgi`	119	`#ifdef __sgi`
110	`inline int round(float x) {return int(rint(x));}`	120	`inline int round(float x) {return int(rint(x));}`
111	`#else`	121	`#else`
112	`inline int round(float x) {return int(x+0.5);}`	122	`inline int round(float x) {return int(x+0.5);}`
113	`#endif`	123	`#endif`
114		124
115	`template<class T>`	125	`template<class T>`
116	`inline T sign(T x) {return x>=T(0) ? 1 : -1;}`	126	`inline T sign(T x) {return x>=T(0) ? 1 : -1;}`
117		127
118	`/// Integer power function with O(log(n)) complexity`	128	`/// Integer power function with O(log(n)) complexity`
119	`template<class T>`	129	`template<class T>`
120	`inline T int_pow(T a, unsigned int n)`	130	`inline T int_pow(T a, unsigned int n)`
121	`{`	131	`{`
122	`T result = static_cast<T>(1);`	132	`T result = static_cast<T>(1);`
123	`for(; n > 0; n >>= 1)`	133	`for(; n > 0; n >>= 1)`
124	`{`	134	`{`
125	`if(n & 1) result = result*a;`	135	`if(n & 1) result = result*a;`
126	`a *= a;`	136	`a *= a;`
127	`}`	137	`}`
128	`return result;`	138	`return result;`
129	`}`	139	`}`
130		140
131	`/// Function that seeds the GEL pseudo-random number generator`	141	`/// Function that seeds the GEL pseudo-random number generator`
132	`void gel_srand(unsigned int seed);`	142	`void gel_srand(unsigned int seed);`
133		143
134	`/** GEL provides a linear congruential pseudo-random number`	144	`/** GEL provides a linear congruential pseudo-random number`
135	`generator which is optimized for speed. This version allows`	145	`generator which is optimized for speed. This version allows`
136	`an integer argument which is useful for grid-based noise`	146	`an integer argument which is useful for grid-based noise`
137	`functions. */`	147	`functions. */`
138	`unsigned int gel_rand(unsigned int k);`	148	`unsigned int gel_rand(unsigned int k);`
139		149
140	`/** GEL provides a linear congruential pseudo-random number`	150	`/** GEL provides a linear congruential pseudo-random number`
141	`generator which is optimized for speed. This means`	151	`generator which is optimized for speed. This means`
142	`that GEL_RAND_MAX==UINT_MAX. */`	152	`that GEL_RAND_MAX==UINT_MAX. */`
143	`unsigned int gel_rand();`	153	`unsigned int gel_rand();`
144		154
145	`/** raw_assign takes a CGLA vector, matrix or whatever has a get() function`	155	`/** raw_assign takes a CGLA vector, matrix or whatever has a get() function`
146	`as its first argument and a raw pointer to a (presumed scalar) entity`	156	`as its first argument and a raw pointer to a (presumed scalar) entity`
147	`as the second argument. the contents dereferenced by the pointer is`	157	`as the second argument. the contents dereferenced by the pointer is`
148	`copied to the entity given as first argument. */`	158	`copied to the entity given as first argument. */`
149	`template<class T, class S>`	159	`template<class T, class S>`
150	`void raw_assign(T& a, const S* b)`	160	`void raw_assign(T& a, const S* b)`
151	`{`	161	`{`
152	`memcpy(static_cast<void>(a.get()),static_cast<const void>(b),sizeof(T));`	162	`memcpy(static_cast<void>(a.get()),static_cast<const void>(b),sizeof(T));`
153	`}`	163	`}`
154		164
155	`}`	165	`}`
156		166
157	`#endif`	167	`#endif`
158		168

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