Added libigl library files (header-only library)

xs/src/igl/dot.h

@@ -0,0 +1,27 @@
+// 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_DOT_H
+#define IGL_DOT_H
+#include "igl_inline.h"
+namespace igl
+{
+  // Computes out = dot(a,b)
+  // Inputs:
+  //   a  left 3d vector
+  //   b  right 3d vector
+  // Returns scalar dot product
+  IGL_INLINE double dot(
+    const double *a, 
+    const double *b);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "dot.cpp"
+#endif
+
+#endif