SilhouetteGeomEngine.h

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once

 
#include <vector>
 
#include "../geometry/Geom.h"
 
#include "../system/FreestyleConfig.h"
 
#include "MEM_guardedalloc.h"
 
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 == nullptr) {
      _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);
 
  MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:SilhouetteGeomEngine")
};
 
} /* namespace Freestyle */