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/** \file \ingroup smoke
*/
//////////////////////////////////////////////////////////////////////
// This file is part of Wavelet Turbulence.
//
// Wavelet Turbulence 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 3 of the License, or
// (at your option) any later version.
//
// Wavelet Turbulence 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 Wavelet Turbulence. If not, see <http://www.gnu.org/licenses/>.
//
// Copyright 2008 Theodore Kim and Nils Thuerey
//
//////////////////////////////////////////////////////////////////////
// Modified to not require TNT matrix library anymore. It was very slow
// when being run in parallel. Required TNT JAMA::Eigenvalue libraries were
// converted into independent functions.
// - MiikaH
//
//////////////////////////////////////////////////////////////////////
// Helper function, compute eigenvalues of 3x3 matrix
//////////////////////////////////////////////////////////////////////
#ifndef EIGENVAL_HELPER_H
#define EIGENVAL_HELPER_H
//#include "tnt/jama_eig.h"
#include <algorithm>
#include <cmath>
using namespace std;
//////////////////////////////////////////////////////////////////////
// eigenvalues of 3x3 non-symmetric matrix
//////////////////////////////////////////////////////////////////////
struct sEigenvalue
{
int n;
int issymmetric;
float d[3]; /* real part */
float e[3]; /* img part */
float V[3][3]; /* Eigenvectors */
float H[3][3];
float ort[3];
float cdivr;
float cdivi;
};
void Eigentred2(sEigenvalue& eval);
void Eigencdiv(sEigenvalue& eval, float xr, float xi, float yr, float yi);
void Eigentql2 (sEigenvalue& eval);
void Eigenorthes (sEigenvalue& eval);
void Eigenhqr2 (sEigenvalue& eval);
int computeEigenvalues3x3(float dout[3], float a[3][3]);
#endif
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