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 
00032 template<class T>
00033 const T& csMax (const T& a, const T& b)
00034 {
00035   if (a >= b) return a;
00036   return b;
00037 }
00038 
00042 template<class T>
00043 const T& csMin (const T& a, const T& b)
00044 {
00045   if (a < b) return a;
00046   return b;
00047 }
00048 
00049 
00053 template<class T>
00054 T csClamp (const T& a, T max, T min)
00055 {
00056   return csMin (csMax (a, min), max);
00057 }
00058 
00064 template<class T>
00065 T csSmoothStep (const T& a, T max, T min)
00066 {
00067   T tmp, tmp2;
00068   if (a <= min)
00069     tmp = 0.0f;
00070   else if (a >= max)
00071     tmp = 1.0f;
00072   else
00073   {
00074     tmp2 = (a - min) / (max-min);
00075     tmp = tmp2*tmp2 * (3.0 - 2.0*tmp2);
00076   }
00077   return tmp;
00078 }
00079 
00083 template<class T>
00084 T csSquare (const T& x)
00085 {
00086   return x * x;
00087 }
00088 
00091 #endif //__CS_MATH_H__

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