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/ceil.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_CEIL_H
+#define IGL_CEIL_H
+#include "igl_inline.h"
+#include <Eigen/Dense>
+namespace igl
+{
+  // Ceil a given matrix to nearest integers 
+  //
+  // Inputs:
+  //   X  m by n matrix of scalars
+  // Outputs:
+  //   Y  m by n matrix of ceiled integers
+  template < typename DerivedX, typename DerivedY>
+  IGL_INLINE void ceil(
+    const Eigen::PlainObjectBase<DerivedX>& X,
+    Eigen::PlainObjectBase<DerivedY>& Y);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "ceil.cpp"
+#endif
+
+#endif