Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/transpose_blocks.cpp

@@ -0,0 +1,63 @@
+// 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/.
+#include "transpose_blocks.h"
+
+#include <cassert>
+
+template <typename T>
+IGL_INLINE void igl::transpose_blocks(
+  const Eigen::Matrix<T,Eigen::Dynamic,Eigen::Dynamic> & A,
+  const size_t k,
+  const size_t dim,
+  Eigen::Matrix<T,Eigen::Dynamic,Eigen::Dynamic> & B)
+{
+  // Eigen matrices must be 2d so dim must be only 1 or 2
+  assert(dim == 1 || dim == 2);
+  // Output is not allowed to be input
+  assert(&A != &B);
+
+
+  // block height, width, and number of blocks
+  int m,n;
+  if(dim == 1)
+  {
+    m = A.rows()/k;
+    n = A.cols();
+  }else// dim == 2
+  {
+    m = A.rows();
+    n = A.cols()/k;
+  }
+
+  // resize output
+  if(dim == 1)
+  {
+    B.resize(n*k,m);
+  }else//dim ==2
+  {
+    B.resize(n,m*k);
+  }
+
+  // loop over blocks
+  for(int b = 0;b<(int)k;b++)
+  {
+    if(dim == 1)
+    {
+      B.block(b*n,0,n,m) = A.block(b*m,0,m,n).transpose();
+    }else//dim ==2
+    {
+      B.block(0,b*m,n,m) = A.block(0,b*n,m,n).transpose();
+    }
+  }
+}
+
+#ifdef IGL_STATIC_LIBRARY
+// Explicit template instantiation
+// generated by autoexplicit.sh
+template void igl::transpose_blocks<double>(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, size_t, size_t, Eigen::Matrix<double, -1, -1, 0, -1, -1>&);
+#endif