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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup freestyle
* \brief Class to perform all geometric operations dedicated to silhouette. That, for example,
* implies that this geom engine has as member data the viewpoint, transformations, projections...
*/
#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:
/** retrieves an instance on the singleton */
static SilhouetteGeomEngine *getInstance()
{
if (_pInstance == NULL) {
_pInstance = new SilhouetteGeomEngine;
}
return _pInstance;
}
/** Sets the current viewpoint */
static inline void setViewpoint(const Vec3r &ivp)
{
_Viewpoint = ivp;
}
/** Sets the current transformation
* iModelViewMatrix
* The 4x4 model view matrix, in column major order (openGL like).
* iProjection matrix
* The 4x4 projection matrix, in column major order (openGL like).
* iViewport
* The viewport. 4 real array: origin.x, origin.y, width, length
* iFocal
* The focal length
*/
static void setTransform(const real iModelViewMatrix[4][4],
const real iProjectionMatrix[4][4],
const int iViewport[4],
real iFocal);
/** Sets the current znear and zfar */
static void setFrustum(real iZNear, real iZFar);
/* accessors */
static void retrieveViewport(int viewport[4]);
/** Projects the silhouette in camera coordinates
* This method modifies the ioEdges passed as argument.
* ioVertices
* The vertices to project. It is modified during the operation.
*/
static void ProjectSilhouette(std::vector<SVertex *> &ioVertices);
static void ProjectSilhouette(SVertex *ioVertex);
/** transforms the parameter t defining a 2D intersection for edge fe in order to obtain
* the parameter giving the corresponding 3D intersection.
* Returns the 3D parameter
* fe
* The edge
* t
* The parameter for the 2D intersection.
*/
static real ImageToWorldParameter(FEdge *fe, real t);
/** From world to image */
static Vec3r WorldToImage(const Vec3r &M);
/** From camera to image */
static Vec3r CameraToImage(const Vec3r &M);
#ifdef WITH_CXX_GUARDEDALLOC
MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:SilhouetteGeomEngine")
#endif
};
} /* namespace Freestyle */
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