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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_SVD3X3_SSE_H
#define IGL_SVD3X3_SSE_H
#include "igl_inline.h"
#include <Eigen/Dense>
namespace igl
{
// Super fast 3x3 SVD according to http://pages.cs.wisc.edu/~sifakis/project_pages/svd.html
// This is SSE version of svd3x3 (see svd3x3.h) which works on 4 matrices at a time
// These four matrices are simply stacked in columns, the rest is the same as for svd3x3
//
// Inputs:
// A 12 by 3 stack of 3x3 matrices
// Outputs:
// U 12x3 left singular vectors stacked
// S 12x1 singular values stacked
// V 12x3 right singular vectors stacked
//
// Known bugs: this will not work correctly for double precision.
template<typename T>
IGL_INLINE void svd3x3_sse(
const Eigen::Matrix<T, 3*4, 3>& A,
Eigen::Matrix<T, 3*4, 3> &U,
Eigen::Matrix<T, 3*4, 1> &S,
Eigen::Matrix<T, 3*4, 3>&V);
}
#ifndef IGL_STATIC_LIBRARY
# include "svd3x3_sse.cpp"
#endif
#endif
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