/*
* Copyright (C) 2007-2008 Anael Orlinski
*
* This file is part of Panomatic.
*
* Panomatic is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* 
* Panomatic 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 General Public License for more details.
* 
* You should have received a copy of the GNU General Public License
* along with Panomatic; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef __lfeat_math_h
#define __lfeat_math_h

#include <vector>

#define PI	3.14159

namespace lfeat {
struct Math {

static bool				SolveLinearSystem33(double *solution, double sq[3][3]);
static inline double	Abs(const double iD) { return (iD > 0.0 ? iD : -iD); }
static inline int		Round(const double iD) { return (int)(iD + 0.5); }
static bool				Normalize(double* iVec, int iLen);


};

template <int LBound = -128, int UBound = 127, class TResult = double, class TArg = double>  
class LUT 
{ 
public: 
	explicit LUT (TResult (*f) (TArg), double coeffadd = 0, double coeffmul = 1) 
	{ 
		lut = lut_array - LBound; 
		for (int i = LBound; i <= UBound; i++) 
		{ 
			lut[i] = f(coeffmul * (i+coeffadd)); 
		} 
	} 
	
	const TResult & operator()(int i) const 
	{ 
		return lut[i]; 
	} 
private: 
	TResult lut_array[UBound - LBound + 1]; 
	TResult * lut; 
}; 

}

#endif //__lfeat_math_h