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#ifndef MATH_REAL_H
#define MATH_REAL_H
/*
GLT OpenGL C++ Toolkit (LGPL)
Copyright (C) 2000-2002 Nigel Stewart
Email: nigels@nigels.com
WWW: http://www.nigels.com/glt/
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*! \file
\brief Numerical Constants
\ingroup Math
*/
#include "glt_config.h"
#include <cfloat>
#include <cmath>
//
// Basic types, constants
// and functions
//
// Constants borrowed from PHP
#define M_PI 3.14159265358979323846
#define M_E 2.7182818284590452354
#define M_LOG2E 1.4426950408889634074
#define M_LOG10E 0.43429448190325182765
#define M_LN2 0.69314718055994530942
#define M_LN10 2.30258509299404568402
#define M_PI_2 1.57079632679489661923
#define M_PI_4 0.78539816339744830962
#define M_1_PI 0.31830988618379067154
#define M_2_PI 0.63661977236758134308
#ifndef M_SQRTPI
#define M_SQRTPI 1.77245385090551602729
#endif
#define M_2_SQRTPI 1.12837916709551257390
#define M_SQRT2 1.41421356237309504880
#ifndef M_SQRT3
#define M_SQRT3 1.73205080756887729352
#endif
#define M_SQRT1_2 0.70710678118654752440
#define M_LNPI 1.14472988584940017414
#define M_EULER 0.57721566490153286061
// Other useful constants
#define M_PI_DEG (M_PI/180.0)
#define M_DEG_PI (180.0/M_PI)
#define M_2PI (2.0*M_PI)
/// Templated square: a^2
template <class A> A SQ(A a) { return a*a; }
///
//template <class A, class B> A SIGN(A a, B b) { return b<0? -a: a; }
template <class A> bool SAME_SIGN(A a, A b) { return (a<0 && b<0 || a>0 && b>0); }
template <class A> A CLAMP(const A x, const A min_v, const A max_v) { return x<min_v? min_v: (x>max_v? max_v: x); }
template <class A> A LERP(const A &a,const A &b,const double t) { return a*(1.0-t) + b*t; }
//template <class A> const A &MIN(const A &a,const B &b) { return a<b ? a : b; }
//template <class A> const A &MAX(const A &a,const B &b) { return a>b ? a : b; }
//template <class A> const A &MIN(const A &a,const B &b,const C &c) { return a<b && a<c ? a : MIN(b,c); }
//template <class A> const A &MAX(const A &a,const B &b,const C &c) { return a>b && a>c ? a : MAX(b,c); }
#define MAX(x,y) (((x)>(y)) ? (x) : (y))
#define MIN(x,y) (((x)<(y)) ? (x) : (y))
#endif
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