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