New Slic3r::TriangleMesh::XS->ToPerl() method

xs/src/TriangleMesh.cpp

@@ -70,3 +70,40 @@ TriangleMesh::WriteOBJFile(char* output_file) {
     stl_generate_shared_vertices(&stl);
     stl_write_obj(&stl, output_file);
 }
+
+AV*
+TriangleMesh::ToPerl() {
+    int i;
+    
+    stl_generate_shared_vertices(&stl);
+    
+    // vertices
+    AV* vertices = newAV();
+    av_extend(vertices, stl.stats.shared_vertices);
+    for (i = 0; i < stl.stats.shared_vertices; i++) {
+        AV* vertex = newAV();
+        av_store(vertices, i, newRV_noinc((SV*)vertex));
+        av_extend(vertex, 2);
+        av_store(vertex, 0, newSVnv(stl.v_shared[i].x));
+        av_store(vertex, 1, newSVnv(stl.v_shared[i].y));
+        av_store(vertex, 2, newSVnv(stl.v_shared[i].z));
+    }
+    
+    // facets
+    AV* facets = newAV();
+    av_extend(facets, stl.stats.number_of_facets);
+    for (i = 0; i < stl.stats.number_of_facets; i++) {
+        AV* facet = newAV();
+        av_store(facets, i, newRV_noinc((SV*)facet));
+        av_extend(facet, 2);
+        av_store(facet, 0, newSVnv(stl.v_indices[i].vertex[0]));
+        av_store(facet, 1, newSVnv(stl.v_indices[i].vertex[1]));
+        av_store(facet, 2, newSVnv(stl.v_indices[i].vertex[2]));
+    }
+    
+    AV* result = newAV();
+    av_extend(result, 1);
+    av_store(result, 0, newRV_noinc((SV*)vertices));
+    av_store(result, 1, newRV_noinc((SV*)facets));
+    return result;
+}

xs/src/TriangleMesh.hpp

@@ -1,5 +1,12 @@
 #include <admesh/stl.h>
 
+extern "C" {
+#include "EXTERN.h"
+#include "perl.h"
+#include "XSUB.h"
+#include "ppport.h"
+}
+
 class TriangleMesh
 {
     public:
@@ -8,6 +15,7 @@ class TriangleMesh
     void ReadSTLFile(char* input_file);
     void Repair();
     void WriteOBJFile(char* output_file);
+    AV* ToPerl();
     private:
     stl_file stl;
 };

xs/xsp/TriangleMesh.xsp

@@ -10,6 +10,7 @@
     void ReadSTLFile(char* input_file);
     void Repair();
     void WriteOBJFile(char* output_file);
+    AV* ToPerl();
 };
 
 %package{Slic3r::TriangleMesh::XS};

xs/xsp/typemap.xspt

@@ -1,2 +1,4 @@
 %typemap{std::string};
 %typemap{std::vector<unsigned int>*};
+%typemap{SV*};
+%typemap{AV*};