WebSVN – gelsvn – Diff – /trunk/src/CGLA/CGLA.h


// $Id: CGLA.h 417 2009-01-12 15:40:09Z jrf $
 
#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>
 
#ifndef M_PI
#define M_PI 3.14159265358979323846
#define M_PI_2 1.57079632679489661923
#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) { return x != x; }
 
  template<class Scalar>
  Scalar s_min(Scalar a, Scalar b)
  {
    return a<b ? a : b;
  }
 
  template<class Scalar>
  Scalar s_max(Scalar a, Scalar b)
  {
    return a>b ? a : b;
  }
 
  /// 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 277	Rev 417
1	`// $Id: CGLA.h 277 2006-08-29 09:14:45Z jrf $`	1	`// $Id: CGLA.h 417 2009-01-12 15:40:09Z jrf $`
2		2
3	`#ifndef __CGLA_CGLA_H__`	3	`#ifndef __CGLA_CGLA_H__`
4	`#define __CGLA_CGLA_H__`	4	`#define __CGLA_CGLA_H__`
5		5
6	`#if (_MSC_VER >= 1200)`	6	`#if (_MSC_VER >= 1200)`
7	`#pragma warning (disable: 4244 4800)`	7	`#pragma warning (disable: 4244 4800)`
8	`#endif`	8	`#endif`
9		9
10	`#include <cmath>`	10	`#include <cmath>`
11	`#include <cfloat>`	11	`#include <cfloat>`
12	`#include <climits>`	12	`#include <climits>`
13	`#include <cassert>`	13	`#include <cassert>`
14	`#include <algorithm>`	14	`#include <algorithm>`
15	`#include <functional>`	15	`#include <functional>`
16		16
17	`#ifndef M_PI`	17	`#ifndef M_PI`
18	`#define M_PI 3.14159265358979323846`	18	`#define M_PI 3.14159265358979323846`
19	`#define M_PI_2 1.57079632679489661923`	19	`#define M_PI_2 1.57079632679489661923`
20	`#endif`	20	`#endif`
21		21
22	`namespace CGLA`	22	`namespace CGLA`
23	`{`	23	`{`
24	`inline float cgla_nan()`	24	`inline float cgla_nan()`
25	`{`	25	`{`
26	`static const float cgla_nan_value = log(-1.0f);`	26	`static const float cgla_nan_value = log(-1.0f);`
27	`return cgla_nan_value;`	27	`return cgla_nan_value;`
28	`}`	28	`}`
29		29
30	`/** Procedural definition of NAN */`	30	`/** Procedural definition of NAN */`
31	`#define CGLA_NAN cgla_nan()`	31	`#define CGLA_NAN cgla_nan()`
32		32
33	`/** NAN is used for initialization of vectors and matrices`	33	`/** NAN is used for initialization of vectors and matrices`
34	`in debug mode */`	34	`in debug mode */`
35	`#define CGLA_INIT_VALUE cgla_nan()`	35	`#define CGLA_INIT_VALUE cgla_nan()`
36		36
37	`/** Numerical constant representing something large.`	37	`/** Numerical constant representing something large.`
38	`value is a bit arbitrary */`	38	`value is a bit arbitrary */`
39	`const double BIG=10e+30;`	39	`const double BIG=10e+30;`
40		40
41	`/** Numerical constant represents something extremely small.`	41	`/** Numerical constant represents something extremely small.`
42	`value is a bit arbitrary */`	42	`value is a bit arbitrary */`
43	`const double MINUTE=10e-30;`	43	`const double MINUTE=10e-30;`
44		44
45	`/** Numerical constant represents something very small.`	45	`/** Numerical constant represents something very small.`
46	`value is a bit arbitrary */`	46	`value is a bit arbitrary */`
47	`const double TINY=3e-7;`	47	`const double TINY=3e-7;`
48		48
49	`/** Numerical constant represents something small.`	49	`/** Numerical constant represents something small.`
50	`value is a bit arbitrary */`	50	`value is a bit arbitrary */`
51	`const double SMALL=10e-2;`	51	`const double SMALL=10e-2;`
52		52
-		53	`/** The GEL pseudo-random number generator uses`
-		54	`UINT_MAX as RAND_MAX to avoid mod operations. */`
-		55	`const unsigned int GEL_RAND_MAX=UINT_MAX;`
-		56
53	`inline double sqrt3()`	57	`inline double sqrt3()`
54	`{`	58	`{`
55	`static const double sqrt3_val = sqrt(3.0);`	59	`static const double sqrt3_val = sqrt(3.0);`
56	`return sqrt3_val;`	60	`return sqrt3_val;`
57	`}`	61	`}`
58		62
59	`#define SQRT3 sqrt3()`	63	`#define SQRT3 sqrt3()`
60		64
61	`/// Useful enum that represents coordiante axes.`	65	`/// Useful enum that represents coordiante axes.`
62	`enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};`	66	`enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};`
63		67
64	`inline bool isnan(double x) { return x != x; }`	68	`inline bool isnan(double x) { return x != x; }`
65		69
66	`template<class Scalar>`	70	`template<class Scalar>`
67	`Scalar s_min(Scalar a, Scalar b)`	71	`Scalar s_min(Scalar a, Scalar b)`
68	`{`	72	`{`
69	`return a<b ? a : b;`	73	`return a<b ? a : b;`
70	`}`	74	`}`
71		75
72	`template<class Scalar>`	76	`template<class Scalar>`
73	`Scalar s_max(Scalar a, Scalar b)`	77	`Scalar s_max(Scalar a, Scalar b)`
74	`{`	78	`{`
75	`return a>b ? a : b;`	79	`return a>b ? a : b;`
76	`}`	80	`}`
77		81
78	`///Template for a function that squares the argument.`	82	`/// Template for a function that squares the argument.`
79	`template <class Scalar>`	83	`template <class Scalar>`
80	`inline Scalar sqr(Scalar x) {///`	84	`inline Scalar sqr(Scalar x) {///`
81	`return x*x;}`	85	`return x*x;}`
82		86
83	`/// Scalaremplate for a function that returns the cube of the argument.`	87	`/// Scalar template for a function that returns the cube of the argument.`
84	`template <class Scalar>`	88	`template <class Scalar>`
85	`inline Scalar qbe(Scalar x) {///`	89	`inline Scalar qbe(Scalar x) {///`
86	`return xxx;}`	90	`return xxx;}`
87		91
88	`template <class Scalar>`	92	`template <class Scalar>`
89	`inline bool is_zero(Scalar x) {return (x > -MINUTE && x < MINUTE);}`	93	`inline bool is_zero(Scalar x) {return (x > -MINUTE && x < MINUTE);}`
90		94
91	`template <class Scalar>`	95	`template <class Scalar>`
92	`inline bool is_tiny(Scalar x) {return (x > -TINY && x < TINY);}`	96	`inline bool is_tiny(Scalar x) {return (x > -TINY && x < TINY);}`
93		97
94	`/** What power of 2 ?. if x is the argument, find the largest`	98	`/** What power of 2 ?. if x is the argument, find the largest`
95	`y so that 2^y <= x */`	99	`y so that 2^y <= x */`
96	`inline int two_to_what_power(unsigned int x)`	100	`inline int two_to_what_power(unsigned int x)`
97	`{`	101	`{`
98	`if (x<1)`	102	`if (x<1)`
99	`return -1;`	103	`return -1;`
100	`int i = 0;`	104	`int i = 0;`
101	`while (x != 1) {x>>=1;i++;}`	105	`while (x != 1) {x>>=1;i++;}`
102	`return i;`	106	`return i;`
103	`}`	107	`}`
104		108
105	`#ifdef __sgi`	109	`#ifdef __sgi`
106	`inline int round(float x) {return int(rint(x));}`	110	`inline int round(float x) {return int(rint(x));}`
107	`#else`	111	`#else`
108	`inline int round(float x) {return int(x+0.5);}`	112	`inline int round(float x) {return int(x+0.5);}`
109	`#endif`	113	`#endif`
110		114
111	`template<class T>`	115	`template<class T>`
112	`inline T sign(T x) {return x>=T(0) ? 1 : -1;}`	116	`inline T sign(T x) {return x>=T(0) ? 1 : -1;}`
113		117
114	`/// Integer power function with O(log(n)) complexity`	118	`/// Integer power function with O(log(n)) complexity`
115	`template<class T>`	119	`template<class T>`
116	`inline T int_pow(T a, unsigned int n)`	120	`inline T int_pow(T a, unsigned int n)`
117	`{`	121	`{`
118	`T result = static_cast<T>(1);`	122	`T result = static_cast<T>(1);`
119	`for(; n > 0; n >>= 1)`	123	`for(; n > 0; n >>= 1)`
120	`{`	124	`{`
121	`if(n & 1) result = result*a;`	125	`if(n & 1) result = result*a;`
122	`a *= a;`	126	`a *= a;`
123	`}`	127	`}`
124	`return result;`	128	`return result;`
125	`}`	129	`}`
-		130
-		131	`/// Function that seeds the GEL pseudo-random number generator`
-		132	`void gel_srand(unsigned int seed);`
-		133
-		134	`/** GEL provides a linear congruential pseudo-random number`
-		135	`generator which is optimized for speed. This version allows`
-		136	`an integer argument which is useful for grid-based noise`
-		137	`functions. */`
-		138	`unsigned int gel_rand(unsigned int k);`
-		139
-		140	`/** GEL provides a linear congruential pseudo-random number`
-		141	`generator which is optimized for speed. This means`
-		142	`that GEL_RAND_MAX==UINT_MAX. */`
-		143	`unsigned int gel_rand();`
126		144
127	`/** raw_assign takes a CGLA vector, matrix or whatever has a get() function`	145	`/** raw_assign takes a CGLA vector, matrix or whatever has a get() function`
128	`as its first argument and a raw pointer to a (presumed scalar) entity`	146	`as its first argument and a raw pointer to a (presumed scalar) entity`
129	`as the second argument. the contents dereferenced by the pointer is`	147	`as the second argument. the contents dereferenced by the pointer is`
130	`copied to the entity given as first argument. */`	148	`copied to the entity given as first argument. */`
131	`template<class T, class S>`	149	`template<class T, class S>`
132	`void raw_assign(T& a, const S* b)`	150	`void raw_assign(T& a, const S* b)`
133	`{`	151	`{`
134	`memcpy(static_cast<void>(a.get()),static_cast<const void>(b),sizeof(T));`	152	`memcpy(static_cast<void>(a.get()),static_cast<const void>(b),sizeof(T));`
135	`}`	153	`}`
136		154
137	`}`	155	`}`
138		156
139	`#endif`	157	`#endif`
140		158

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(root)/trunk/src/CGLA/CGLA.h – Rev 277 → 417