Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/svd3x3_sse.h

@@ -0,0 +1,37 @@
+// 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