mesh_source.h

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#ifndef K3DSDK_MESH_SOURCE_H
#define K3DSDK_MESH_SOURCE_H

// K-3D
// Copyright (c) 1995-2008, Timothy M. Shead
//
// Contact: tshead@k-3d.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#include <k3d-i18n-config.h>
#include <k3dsdk/data.h>
#include <k3dsdk/hints.h>
#include <k3dsdk/ipipeline_profiler.h>
#include <k3dsdk/imesh_source.h>
#include <k3dsdk/mesh.h>
#include <k3dsdk/pointer_demand_storage.h>

namespace k3d
{

template<typename base_t>
class mesh_source :
  public base_t,
  public imesh_source
{
public:
  iproperty& mesh_source_output()
  {
    return m_output_mesh;
  }

  sigc::slot<void, ihint*> make_update_mesh_slot()
  {
    return m_output_mesh.make_slot();
  }

protected:
  mesh_source(iplugin_factory& Factory, idocument& Document) :
    base_t(Factory, Document),
    m_output_mesh(init_owner(*this) + init_name("output_mesh") + init_label(_("Output Mesh")) + init_description("Output mesh"))
  {
    m_output_mesh.set_update_slot(sigc::mem_fun(*this, &mesh_source<base_t>::execute));
  }

  k3d_data(mesh*, immutable_name, change_signal, no_undo, pointer_demand_storage, no_constraint, read_only_property, no_serialization) m_output_mesh;

private:
  void execute(const std::vector<ihint*>& Hints, mesh& Mesh)
  {
    bool_t update_topology = false;
    bool_t update_geometry = false;

    for(uint_t i = 0; i != Hints.size(); ++i)
    {
      // Update our geometry ...
      if(dynamic_cast<hint::mesh_geometry_changed*>(Hints[i]))
      {
        update_geometry = true;
      }
      // In all other cases (mesh_topology_changed, unknown hint, or no hint),
      // we must assume the worst and recreate everything from scratch ...
      else
      {
        update_topology = true;
        update_geometry = true;
        break;
      }
    }

    if(update_topology)
    {
      base_t::document().pipeline_profiler().start_execution(*this, "Update Topology");
      on_update_mesh_topology(Mesh);
      base_t::document().pipeline_profiler().finish_execution(*this, "Update Topology");
    }

    if(update_geometry)
    {
      base_t::document().pipeline_profiler().start_execution(*this, "Update Geometry");
      on_update_mesh_geometry(Mesh);
      base_t::document().pipeline_profiler().finish_execution(*this, "Update Geometry");
    }
  }

  virtual void on_update_mesh_topology(mesh& Output) = 0;

  virtual void on_update_mesh_geometry(mesh& Output) = 0;
};

} // namespace k3d

#endif // !K3DSDK_MESH_SOURCE_H

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