CrystalSpace

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csgeom/math.h

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00001 /*
00002   Copyright (C) 2005 by Marten Svanfeldt
00003   
00004   This library is free software; you can redistribute it and/or
00005   modify it under the terms of the GNU Library General Public
00006   License as published by the Free Software Foundation; either
00007   version 2 of the License, or (at your option) any later version.
00008 
00009   This library is distributed in the hope that it will be useful,
00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012   Library General Public License for more details.
00013 
00014   You should have received a copy of the GNU Library General Public
00015   License along with this library; if not, write to the Free
00016   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_MATH_H__
00020 #define __CS_MATH_H__
00021 
00022 #include "csutil/algorithms.h"
00023 
00034 template<class T>
00035 const T& csMax (const T& a, const T& b)
00036 {
00037   if (b < a) return a;
00038   return b;
00039 }
00040 
00044 template<class T>
00045 const T& csMin (const T& a, const T& b)
00046 {
00047   if (a < b) return a;
00048   return b;
00049 }
00050 
00054 template<class T>
00055 void csSort (T& a, T& b)
00056 {
00057   if (b < a)
00058     CS::Swap (a, b);
00059 }
00060 
00065 template<class T, class U>
00066 void csSort (T& a, T& b, U& x, U& y)
00067 {
00068   if (b < a)
00069   {
00070     CS::Swap (a, b);
00071     CS::Swap (x, y);
00072   }
00073 }
00074 
00075 
00079 template<class T>
00080 T csClamp (const T& a, T max, T min)
00081 {
00082   return csMin (csMax (a, min), max);
00083 }
00084 
00090 template<class T>
00091 T csSmoothStep (const T& a, T max, T min)
00092 {
00093   T tmp, tmp2;
00094   if (a <= min)
00095     tmp = 0.0f;
00096   else if (a >= max)
00097     tmp = 1.0f;
00098   else
00099   {
00100     tmp2 = (a - min) / (max-min);
00101     tmp = tmp2*tmp2 * (3.0 - 2.0*tmp2);
00102   }
00103   return tmp;
00104 }
00105 
00109 template<class T>
00110 T csSquare (const T& x)
00111 {
00112   return x * x;
00113 }
00114 
00116 
00119 CS_FORCEINLINE bool csFinite (float f)
00120 {
00121 #if defined (CS_HAVE_FINITEF)
00122   return finitef (f);
00123 #elif defined (CS_HAVE_STD__ISFINITE)
00124   return std::isfinite (f);
00125 #elif defined(CS_HAVE_ISFINITE)
00126   return isfinite (f);
00127 #elif defined (CS_HAVE_FINITE)
00128   return finite (f);
00129 #elif defined (CS_HAVE__FINITE)
00130   return _finite (f) != 0;
00131 #else
00132 #error Your platform has no isfinite()-alike function!
00133 #endif
00134 }
00135 CS_FORCEINLINE bool csFinite (double d)
00136 {
00137 #if defined (CS_HAVE_STD__ISFINITE)
00138   return std::isfinite (d);
00139 #elif defined(CS_HAVE_ISFINITE)
00140   return isfinite (d);
00141 #elif defined (CS_HAVE_FINITE)
00142   return finite (d);
00143 #elif defined (CS_HAVE__FINITE)
00144   return _finite (d) != 0;
00145 #else
00146 #error Your platform has no isfinite()-alike function!
00147 #endif
00148 }
00150 
00153 #endif //__CS_MATH_H__

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