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


#ifndef __CGLA_CGLA_H__
#define __CGLA_CGLA_H__
 
#include <cmath>
#include <climits>
#include <cassert>
#include <algorithm>
 
#ifndef M_PI
#define M_PI 3.14159265358979323846
#define M_PI_2 1.57079632679489661923
#endif
 
namespace CGLA 
{
  /** Procedural definition of NAN */  
  const float CGLA_NAN = log(-1.0f);
 
  /** NAN is used for initialization of vectors and matrices
      in debug mode */
  const float 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;
 
  const double SQRT3=sqrt(3.0);
 
  /// Useful enum that represents coordiante axes.
  enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};
 
  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;}
	
  /// Scalaremplate 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;}
 
 
  template<class T>
  inline T int_pow(T x, unsigned int k) 
  {
    T y = static_cast<T>(1);
    for(unsigned int i=0;i<k;++i)
      y *= x;
    return y;
  }
 
	/** 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 39	Rev 45
1	`#ifndef __CGLA_CGLA_H__`	1	`#ifndef __CGLA_CGLA_H__`
2	`#define __CGLA_CGLA_H__`	2	`#define __CGLA_CGLA_H__`
3		3
4	`#include <cmath>`	4	`#include <cmath>`
5	`#include <climits>`	5	`#include <climits>`
6	`#include <cassert>`	6	`#include <cassert>`
7	`#include <algorithm>`	7	`#include <algorithm>`
8		8
9	`#ifndef M_PI`	9	`#ifndef M_PI`
10	`#define M_PI 3.14159265358979323846`	10	`#define M_PI 3.14159265358979323846`
11	`#define M_PI_2 1.57079632679489661923`	11	`#define M_PI_2 1.57079632679489661923`
12	`#endif`	12	`#endif`
13		13
14	`namespace CGLA`	14	`namespace CGLA`
15	`{`	15	`{`
16	`/** Procedural definition of NAN */`	16	`/** Procedural definition of NAN */`
17	`const float CGLA_NAN = log(-1.0f);`	17	`const float CGLA_NAN = log(-1.0f);`
18		18
19	`/** NAN is used for initialization of vectors and matrices`	19	`/** NAN is used for initialization of vectors and matrices`
20	`in debug mode */`	20	`in debug mode */`
21	`const float CGLA_INIT_VALUE = CGLA_NAN;`	21	`const float CGLA_INIT_VALUE = CGLA_NAN;`
22		22
23	`/** Numerical constant representing something large.`	23	`/** Numerical constant representing something large.`
24	`value is a bit arbitrary */`	24	`value is a bit arbitrary */`
25	`const double BIG=10e+30;`	25	`const double BIG=10e+30;`
26		26
27	`/** Numerical constant represents something extremely small.`	27	`/** Numerical constant represents something extremely small.`
28	`value is a bit arbitrary */`	28	`value is a bit arbitrary */`
29	`const double MINUTE=10e-30;`	29	`const double MINUTE=10e-30;`
30		30
31	`/** Numerical constant represents something very small.`	31	`/** Numerical constant represents something very small.`
32	`value is a bit arbitrary */`	32	`value is a bit arbitrary */`
33	`const double TINY=3e-7;`	33	`const double TINY=3e-7;`
34		34
35	`/** Numerical constant represents something small.`	35	`/** Numerical constant represents something small.`
36	`value is a bit arbitrary */`	36	`value is a bit arbitrary */`
37	`const double SMALL=10e-2;`	37	`const double SMALL=10e-2;`
38		38
39	`const double SQRT3=sqrt(3.0);`	39	`const double SQRT3=sqrt(3.0);`
40		40
41	`/// Useful enum that represents coordiante axes.`	41	`/// Useful enum that represents coordiante axes.`
42	`enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};`	42	`enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};`
43		43
44	`template<class Scalar>`	44	`template<class Scalar>`
45	`Scalar s_min(Scalar a, Scalar b)`	45	`Scalar s_min(Scalar a, Scalar b)`
46	`{`	46	`{`
47	`return a<b ? a : b;`	47	`return a<b ? a : b;`
48	`}`	48	`}`
49		49
50	`template<class Scalar>`	50	`template<class Scalar>`
51	`Scalar s_max(Scalar a, Scalar b)`	51	`Scalar s_max(Scalar a, Scalar b)`
52	`{`	52	`{`
53	`return a>b ? a : b;`	53	`return a>b ? a : b;`
54	`}`	54	`}`
55		55
56	`///Template for a function that squares the argument.`	56	`///Template for a function that squares the argument.`
57	`template <class Scalar>`	57	`template <class Scalar>`
58	`inline Scalar sqr(Scalar x) {///`	58	`inline Scalar sqr(Scalar x) {///`
59	`return x*x;}`	59	`return x*x;}`
60		60
61	`/// Scalaremplate for a function that returns the cube of the argument.`	61	`/// Scalaremplate for a function that returns the cube of the argument.`
62	`template <class Scalar>`	62	`template <class Scalar>`
63	`inline Scalar qbe(Scalar x) {///`	63	`inline Scalar qbe(Scalar x) {///`
64	`return xxx;}`	64	`return xxx;}`
65		65
66	`template <class Scalar>`	66	`template <class Scalar>`
67	`inline bool is_zero(Scalar x) {return (x > -MINUTE && x < MINUTE);}`	67	`inline bool is_zero(Scalar x) {return (x > -MINUTE && x < MINUTE);}`
68		68
69	`template <class Scalar>`	69	`template <class Scalar>`
70	`inline bool is_tiny(Scalar x) {return (x > -TINY && x < TINY);}`	70	`inline bool is_tiny(Scalar x) {return (x > -TINY && x < TINY);}`
71		71
72	`/** What power of 2 ?. if x is the argument, find the largest`	72	`/** What power of 2 ?. if x is the argument, find the largest`
73	`y so that 2^y <= x */`	73	`y so that 2^y <= x */`
74	`inline int two_to_what_power(int x)`	74	`inline int two_to_what_power(unsigned int x)`
75	`{`	75	`{`
76	`if (x<1)`	76	`if (x<1)`
77	`return -1;`	77	`return -1;`
78	`int i = 0;`	78	`int i = 0;`
79	`while (x != 1) {x>>=1;i++;}`	79	`while (x != 1) {x>>=1;i++;}`
80	`return i;`	80	`return i;`
81	`}`	81	`}`
82		82
83	`#ifdef __sgi`	83	`#ifdef __sgi`
84	`inline int round(float x) {return int(rint(x));}`	84	`inline int round(float x) {return int(rint(x));}`
85	`#else`	85	`#else`
86	`inline int round(float x) {return int(x+0.5);}`	86	`inline int round(float x) {return int(x+0.5);}`
87	`#endif`	87	`#endif`
88		88
89	`template<class T>`	89	`template<class T>`
90	`inline T sign(T x) {return x>=T(0) ? 1 : -1;}`	90	`inline T sign(T x) {return x>=T(0) ? 1 : -1;}`
91		91
92		92
93	`template<class T>`	93	`template<class T>`
94	`inline T int_pow(T x, int k)`	94	`inline T int_pow(T x, unsigned int k)`
95	`{`	95	`{`
96	`T y = static_cast<T>(1);`	96	`T y = static_cast<T>(1);`
97	`for(int i=0;i<k;++i)`	97	`for(unsigned int i=0;i<k;++i)`
98	`y *= x;`	98	`y *= x;`
99	`return y;`	99	`return y;`
100	`}`	100	`}`
101		101
102	`/** raw_assign takes a CGLA vector, matrix or whatever has a get() function`	102	`/** raw_assign takes a CGLA vector, matrix or whatever has a get() function`
103	`as its first argument and a raw pointer to a (presumed scalar) entity`	103	`as its first argument and a raw pointer to a (presumed scalar) entity`
104	`as the second argument. the contents dereferenced by the pointer is`	104	`as the second argument. the contents dereferenced by the pointer is`
105	`copied to the entity given as first argument. */`	105	`copied to the entity given as first argument. */`
106	`template<class T, class S>`	106	`template<class T, class S>`
107	`void raw_assign(T& a, const S* b)`	107	`void raw_assign(T& a, const S* b)`
108	`{`	108	`{`
109	`memcpy(static_cast<void>(a.get()),static_cast<const void>(b),sizeof(T));`	109	`memcpy(static_cast<void>(a.get()),static_cast<const void>(b),sizeof(T));`
110	`}`	110	`}`
111		111
112	`}`	112	`}`
113		113
114	`#endif`	114	`#endif`
115		115

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(root)/trunk/src/CGLA/CGLA.h – Rev 39 → 45