Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/line_search.h

@@ -0,0 +1,42 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+//
+// Copyright (C) 2016 Michael Rabinovich
+//
+// 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_LINE_SEARCH_H
+#define IGL_LINE_SEARCH_H
+#include "igl_inline.h"
+
+#include <Eigen/Dense>
+
+namespace igl
+{
+  // Implement a bisection linesearch to minimize a mesh-based energy on vertices given at 'x' at a search direction 'd',
+  // with initial step size. Stops when a point with lower energy is found, or after maximal iterations have been reached.
+  //
+  // Inputs:
+  //   x  						#X by dim list of variables
+  //   d  						#X by dim list of a given search direction
+  //   i_step_size  			initial step size
+  //   energy       			A function to compute the mesh-based energy (return an energy that is bigger than 0)
+  //   cur_energy(OPTIONAL)     The energy at the given point. Helps save redundant computations.
+  //							This is optional. If not specified, the function will compute it.
+  // Outputs:
+  //		x  						#X by dim list of variables at the new location
+  // Returns the energy at the new point 'x'
+  IGL_INLINE double line_search(
+    Eigen::MatrixXd& x,
+    const Eigen::MatrixXd& d,
+    double i_step_size,
+    std::function<double(Eigen::MatrixXd&)> energy,
+    double cur_energy = -1);
+
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "line_search.cpp"
+#endif
+
+#endif