//
//  libavg - Media Playback Engine. 
//  Copyright (C) 2003-2014 Ulrich von Zadow
//
//  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 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
//
//  Current versions can be found at www.libavg.de
//

#ifndef _MathHelper_H_
#define _MathHelper_H_

#include "../api.h"
#include <vector>
#include <set>

#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

namespace avg {

static const float PI = 3.14159265358979323846f;
static const float EPSILON = 0.00001f;

bool ispow2(int n);

int nextpow2(int n);

int safeCeil(float d);

bool almostEqual(float d1, float d2, float epsilon=EPSILON);

float invSqrt(float x);

template<class T>
T sqr(T d)
{
    return d*d;
}

template<class T>
int sgn(T val)
{
    return int(val/fabs(val));
}

template<class T>
std::vector<T> vectorFromCArray(int n, T* pData)
{
    std::vector<T> v;
    for (int i=0; i<n; ++i) {
        v.push_back(*(pData+i));
    }
    return v;
}

template<class T>
std::vector<std::vector<T> > vector2DFromCArray(int n, int m, T* pData)
{
    std::vector<std::vector<T> > v(4, std::vector<T>());
    for (int i=0; i<n; ++i) {
        for (int j=0; j<m; ++j) {
            v[i].push_back(*(pData+j+i*m));
        }
    }
    return v;
}

#ifndef round
template<class T>
T round(T d)
{
    return floor(d + 0.5f);
}
#endif

}
#endif