Building igl statically and moving to the dep scripts

Fixing dep build script on Windows and removing some warnings.

Use bundled igl by default.

Not building with the dependency scripts if not explicitly stated. This way, it will stay in
Fix the libigl patch to include C source files in header only mode.

src/libigl/igl/qslim.cpp

@@ -0,0 +1,120 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2016 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 "qslim.h"
+
+#include "collapse_edge.h"
+#include "connect_boundary_to_infinity.h"
+#include "decimate.h"
+#include "edge_flaps.h"
+#include "is_edge_manifold.h"
+#include "max_faces_stopping_condition.h"
+#include "per_vertex_point_to_plane_quadrics.h"
+#include "qslim_optimal_collapse_edge_callbacks.h"
+#include "quadric_binary_plus_operator.h"
+#include "remove_unreferenced.h"
+#include "slice.h"
+#include "slice_mask.h"
+
+IGL_INLINE bool igl::qslim(
+  const Eigen::MatrixXd & V,
+  const Eigen::MatrixXi & F,
+  const size_t max_m,
+  Eigen::MatrixXd & U,
+  Eigen::MatrixXi & G,
+  Eigen::VectorXi & J,
+  Eigen::VectorXi & I)
+{
+  using namespace igl;
+
+  // Original number of faces
+  const int orig_m = F.rows();
+  // Tracking number of faces
+  int m = F.rows();
+  typedef Eigen::MatrixXd DerivedV;
+  typedef Eigen::MatrixXi DerivedF;
+  DerivedV VO;
+  DerivedF FO;
+  igl::connect_boundary_to_infinity(V,F,VO,FO);
+  // decimate will not work correctly on non-edge-manifold meshes. By extension
+  // this includes meshes with non-manifold vertices on the boundary since these
+  // will create a non-manifold edge when connected to infinity.
+  if(!is_edge_manifold(FO))
+  {
+    return false;
+  }
+  Eigen::VectorXi EMAP;
+  Eigen::MatrixXi E,EF,EI;
+  edge_flaps(FO,E,EMAP,EF,EI);
+  // Quadrics per vertex
+  typedef std::tuple<Eigen::MatrixXd,Eigen::RowVectorXd,double> Quadric;
+  std::vector<Quadric> quadrics;
+  per_vertex_point_to_plane_quadrics(VO,FO,EMAP,EF,EI,quadrics);
+  // State variables keeping track of edge we just collapsed
+  int v1 = -1;
+  int v2 = -1;
+  // Callbacks for computing and updating metric
+  std::function<void(
+    const int e,
+    const Eigen::MatrixXd &,
+    const Eigen::MatrixXi &,
+    const Eigen::MatrixXi &,
+    const Eigen::VectorXi &,
+    const Eigen::MatrixXi &,
+    const Eigen::MatrixXi &,
+    double &,
+    Eigen::RowVectorXd &)> cost_and_placement;
+  std::function<bool(
+    const Eigen::MatrixXd &                                         ,/*V*/
+    const Eigen::MatrixXi &                                         ,/*F*/
+    const Eigen::MatrixXi &                                         ,/*E*/
+    const Eigen::VectorXi &                                         ,/*EMAP*/
+    const Eigen::MatrixXi &                                         ,/*EF*/
+    const Eigen::MatrixXi &                                         ,/*EI*/
+    const std::set<std::pair<double,int> > &                        ,/*Q*/
+    const std::vector<std::set<std::pair<double,int> >::iterator > &,/*Qit*/
+    const Eigen::MatrixXd &                                         ,/*C*/
+    const int                                                        /*e*/
+    )> pre_collapse;
+  std::function<void(
+    const Eigen::MatrixXd &                                         ,   /*V*/
+    const Eigen::MatrixXi &                                         ,   /*F*/
+    const Eigen::MatrixXi &                                         ,   /*E*/
+    const Eigen::VectorXi &                                         ,/*EMAP*/
+    const Eigen::MatrixXi &                                         ,  /*EF*/
+    const Eigen::MatrixXi &                                         ,  /*EI*/
+    const std::set<std::pair<double,int> > &                        ,   /*Q*/
+    const std::vector<std::set<std::pair<double,int> >::iterator > &, /*Qit*/
+    const Eigen::MatrixXd &                                         ,   /*C*/
+    const int                                                       ,   /*e*/
+    const int                                                       ,  /*e1*/
+    const int                                                       ,  /*e2*/
+    const int                                                       ,  /*f1*/
+    const int                                                       ,  /*f2*/
+    const bool                                                  /*collapsed*/
+    )> post_collapse;
+  qslim_optimal_collapse_edge_callbacks(
+    E,quadrics,v1,v2, cost_and_placement, pre_collapse,post_collapse);
+  // Call to greedy decimator
+  bool ret = decimate(
+    VO, FO,
+    cost_and_placement,
+    max_faces_stopping_condition(m,orig_m,max_m),
+    pre_collapse,
+    post_collapse,
+    E, EMAP, EF, EI,
+    U, G, J, I);
+  // Remove phony boundary faces and clean up
+  const Eigen::Array<bool,Eigen::Dynamic,1> keep = (J.array()<orig_m);
+  igl::slice_mask(Eigen::MatrixXi(G),keep,1,G);
+  igl::slice_mask(Eigen::VectorXi(J),keep,1,J);
+  Eigen::VectorXi _1,I2;
+  igl::remove_unreferenced(Eigen::MatrixXd(U),Eigen::MatrixXi(G),U,G,_1,I2);
+  igl::slice(Eigen::VectorXi(I),I2,1,I);
+
+  return ret;
+}