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//
// Filename : NodeCamera.h
// Author(s) : Stephane Grabli
// Purpose : Class to represent a light node
// Date of creation : 25/01/2002
//
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) : Please refer to the COPYRIGHT file distributed
// with this source distribution.
//
// 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.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef NODE_CAMERA_H_
#define NODE_CAMERA_H_
# include "../geometry/Geom.h"
# include "../system/FreestyleConfig.h"
# include "Node.h"
using namespace Geometry;
class NodeOrthographicCamera;
class NodePerspectiveCamera;
class LIB_SCENE_GRAPH_EXPORT NodeCamera : public Node
{
public:
typedef enum {PERSPECTIVE,ORTHOGRAPHIC,GENERIC} CameraType;
/*! Default matrices: Identity for both projection and modelview. */
NodeCamera(CameraType camera_type = GENERIC);
NodeCamera(const NodeCamera& iBrother);
virtual ~NodeCamera() {}
/*! Accept the corresponding visitor */
virtual void accept(SceneVisitor& v);
/*! Matrix is copied */
void setModelViewMatrix(double modelview_matrix[16]);
/*! Matrix is copied */
void setProjectionMatrix(double projection_matrix[16]);
double * modelViewMatrix() {return modelview_matrix_;}
double * projectionMatrix() {return projection_matrix_;}
protected:
// row major right handed matrix
double modelview_matrix_[16];
// row major right handed matrix
double projection_matrix_[16];
CameraType camera_type_;
};
class LIB_SCENE_GRAPH_EXPORT NodeOrthographicCamera : public NodeCamera{
public:
NodeOrthographicCamera();
/*! Builds a parallel projection matrix a la glOrtho.
A 0 0 tx
0 B 0 ty
0 0 C tz
0 0 0 1
where
A =
2 / (right - left)
B =
2 / (top - bottom)
C =
-2 / (far - near)
tx =
-(right + left) / (right - left)
ty =
-(top + bottom) / (top - bottom)
tz =
-(zFar + zNear) / (zFar - zNear)
*/
NodeOrthographicCamera(double left
, double right
, double bottom
, double top
, double zNear
, double zFar
);
double left() const {return left_;}
double right() const {return right_;}
double bottom() const {return bottom_;}
double top() const {return top_;}
double zNear() const {return zNear_;}
double zFar() const {return zFar_;}
NodeOrthographicCamera(const NodeOrthographicCamera& iBrother);
private:
double left_;
double right_;
double bottom_;
double top_;
double zNear_;
double zFar_;
};
class LIB_SCENE_GRAPH_EXPORT NodePerspectiveCamera : public NodeCamera {
public:
NodePerspectiveCamera();
/*! Builds a perspective projection matrix a la gluPerspective.
Given f defined as follows:
fovy
f = cotangent(____)
2
The generated matrix is
( f )
| ______ |
| aspect 0 0 0 |
| |
| 0 f 0 0 |
| |
| zNear+zFar 2*zNear*zFar |
| __________ ____________ |
| 0 0 zNear-zFar zNear-zFar |
| |
( 0 0 -1 0 )
\param fovy
Field of View specified in radians.
*/
NodePerspectiveCamera(double fovy
, double aspect
, double zNear
, double zFar);
/*! Builds a perspective projection matrix a la glFrustum.
( 2*zNear )
| __________ |
| right-left 0 A 0 |
| |
| 2*zNear |
| 0 __________ B 0 |
| top-bottom |
| |
| 0 0 C D |
| |
| 0 0 -1 0 |
( )
right+left
A = __________
right-left
top+bottom
B = __________
top-bottom
zFar+zNear
C = - __________
zFar-zNear
2*zFar*zNear
D = - ____________
zFar-zNear
*/
NodePerspectiveCamera(double left,
double right,
double bottom,
double top,
double zNear,
double zFar);
};
#endif // NODE_CAMERA_H_
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