Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/libigl/igl/quat_to_mat.h

@@ -0,0 +1,30 @@
+// 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_QUAT_TO_MAT_H
+#define IGL_QUAT_TO_MAT_H
+#include "igl_inline.h"
+// Name history:
+//   quat2mat  until 16 Sept 2011
+namespace igl
+{
+  // Convert a quaternion to a 4x4 matrix
+  // A Quaternion, q, is defined here as an arrays of four scalars (x,y,z,w),
+  // such that q = x*i + y*j + z*k + w
+  // Input:
+  //   quat  pointer to four elements of quaternion (x,y,z,w)  
+  // Output:
+  //   mat  pointer to 16 elements of matrix
+  template <typename Q_type>
+  IGL_INLINE void quat_to_mat(const Q_type * quat, Q_type * mat);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "quat_to_mat.cpp"
+#endif
+
+#endif