SilhouetteGeomEngine.h

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/*
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
 
#pragma once
 
#include <vector>
 
#include "../geometry/Geom.h"
 
#include "../system/FreestyleConfig.h"
 
#ifdef WITH_CXX_GUARDEDALLOC
#  include "MEM_guardedalloc.h"
#endif
 
namespace Freestyle {
 
using namespace Geometry;
 
class SVertex;
class FEdge;
 
class SilhouetteGeomEngine {
 private:
  // The viewpoint under which the silhouette has to be computed
  static Vec3r _Viewpoint;
  static real _translation[3];
  // the model view matrix (_modelViewMatrix[i][j] means element of line i and column j)
  static real _modelViewMatrix[4][4];
  // the projection matrix (_projectionMatrix[i][j] means element of line i and column j)
  static real _projectionMatrix[4][4];
  // the global transformation from world to screen (projection included)
  // (_transform[i][j] means element of line i and column j)
  static real _transform[4][4];
  // the viewport
  static int _viewport[4];
  static real _Focal;
 
  static real _znear;
  static real _zfar;
 
  // GL style (column major) projection matrix
  static real _glProjectionMatrix[4][4];
  // GL style (column major) model view matrix
  static real _glModelViewMatrix[4][4];
 
  static bool _isOrthographicProjection;
 
  static SilhouetteGeomEngine *_pInstance;
 
 public:
  static SilhouetteGeomEngine *getInstance()
  {
    if (_pInstance == NULL) {
      _pInstance = new SilhouetteGeomEngine;
    }
    return _pInstance;
  }
 
  static inline void setViewpoint(const Vec3r &ivp)
  {
    _Viewpoint = ivp;
  }
 
  static void setTransform(const real iModelViewMatrix[4][4],
                           const real iProjectionMatrix[4][4],
                           const int iViewport[4],
                           real iFocal);
 
  static void setFrustum(real iZNear, real iZFar);
 
  /* accessors */
  static void retrieveViewport(int viewport[4]);
 
  static void ProjectSilhouette(std::vector<SVertex *> &ioVertices);
  static void ProjectSilhouette(SVertex *ioVertex);
 
  static real ImageToWorldParameter(FEdge *fe, real t);
 
  static Vec3r WorldToImage(const Vec3r &M);
 
  static Vec3r CameraToImage(const Vec3r &M);
 
#ifdef WITH_CXX_GUARDEDALLOC
  MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:SilhouetteGeomEngine")
#endif
};
 
} /* namespace Freestyle */