+ vertices(VERTEX3),
+ ibuf(0),
+ defer_ibuf(true),
+ winding(0)
+{ }
+
+Mesh::Mesh(const VertexFormat &f):
+ vertices(f),
+ ibuf(0),
+ defer_ibuf(true),
+ winding(0)
+{ }
+
+Mesh::~Mesh()
+{
+ delete ibuf;
+}
+
+void Mesh::clear()
+{
+ vertices.clear();
+ batches.clear();
+}
+
+void Mesh::use_buffers(bool b)
+{
+ if(b)
+ {
+ vertices.use_vertex_buffer();
+ if(!ibuf)
+ ibuf = new Buffer(ELEMENT_ARRAY_BUFFER);
+ defer_ibuf = false;
+ }
+ else
+ {
+ vertices.use_vertex_buffer(0);
+ delete ibuf;
+ ibuf = 0;
+ defer_ibuf = false;
+ }
+}
+
+unsigned Mesh::get_n_vertices() const
+{
+ return vertices.size();
+}
+
+float *Mesh::modify_vertex(unsigned i)
+{
+ return vertices.modify(i);
+}
+
+void Mesh::add_batch(const Batch &b)