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added SetSubView, some comment and put the class back(!)

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ganovelli 2004-11-03 09:38:21 +00:00
parent d0c1352cf3
commit a66d6d3ebd
1 changed files with 52 additions and 26 deletions
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78
wrap/gl/camera.h
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@ -23,64 +23,90 @@
/****************************************************************************
History
$Log: not supported by cvs2svn $
Revision 1.2 2004/10/05 19:04:44 ganovelli
changed from classes to functions
Revision 1.1 2004/09/15 22:59:13 ganovelli
creation
Revision 1.2 2004/09/06 21:41:30 ganovelli
*** empty log message ***
Revision 1.1 2004/09/03 13:01:51 ganovelli
creation
/****************************************************************************/
#ifndef __GL_CAMERA
#define __GL_CAMERA
#include <QMessageBox.h>
// VCG
#include <vcg/math/camera.h>
// opengl
#include <GL/glew.h>
template<class CameraType>
vcg::Matrix44<typename CameraType::ScalarType>
MatrixGL(const CameraType & cam, typename CameraType::ScalarType far,vcg::Matrix44<typename CameraType::ScalarType> &m){
template <class CameraType>
struct GlCamera{
typedef typename CameraType::ScalarType ScalarType;
typedef typename CameraType::ScalarType S;
/// returns the opengl matrix corresponding to the camera
static vcg::Matrix44<ScalarType>
MatrixGL(const vcg::Camera<ScalarType> & cam, vcg::Matrix44<ScalarType> &m){
glPushAttrib(GL_TRANSFORM_BIT);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
cam.TransformGL(far);
TransformGL(cam);
glGetv(GL_PROJECTION_MATRIX,&m[0][0]);
glPopMatrix();
glPopAttrib();
return m;
}
template<class CameraType>
void TransformGL(const CameraType & camera,typename CameraType::ScalarType farDist) {
/////////////////// METTERE IL FRUSTUM GIUSTO //////////////////////
//glFrustum(1,10,2,20,1,20);
typedef typename CameraType::ScalarType S;
S sx,dx,bt,tp,nr,fr;
dx = -camera.c.X()*camera.s.X();
sx = ( camera.viewport.X() - camera.c.X() ) * camera.s.X();
/// computes the parametrs as to call the glFrustum(..)
static void
GetFrustum(const CameraType & camera,
typename CameraType::ScalarType & sx,
typename CameraType::ScalarType & dx,
typename CameraType::ScalarType & bt,
typename CameraType::ScalarType & tp,
typename CameraType::ScalarType & f ,
typename CameraType::ScalarType & fr
)
{
dx = camera.c.X()*camera.s.X();
sx = -( camera.viewport.X() - camera.c.X() ) * camera.s.X();
bt = -camera.c.Y()*camera.s.Y();
tp = ( camera.viewport.Y() - camera.c.Y() ) * camera.s.Y();
nr = camera.f;
fr = farDist; // tmp
f = camera.f;
fr = camera.farend;
}
/// perform the opengl trasformatino correponding to the camera
static void TransformGL(const vcg::Camera<ScalarType> & camera,typename ScalarType farDist = -1 ) {
ScalarType sx,dx,bt,tp,nr,fr;
GetFrustum(camera,sx,dx,bt,tp,nr,fr);
assert(glGetError()==0);
glFrustum(dx,sx,bt,tp,nr,fr);
glFrustum(sx,dx,bt,tp,nr,(farDist == -1)?fr:farDist);
assert(glGetError()==0);
}
/// set the view as from the camera but only in a portion of the view (c0,c1 in [0,1]x[0,1]
static void SetSubView(const CameraType & camera,vcg::Point2<S> c0,vcg::Point2<S> c1){
typedef typename CameraType::ScalarType S;
S sx,dx,bt,tp,nr,fr;
GetFrustum(camera,sx,dx,bt,tp,nr,fr);
S cv[2];
cv[0] = dx-sx;
cv[1] = tp-bt;
glFrustum(sx + cv[0]* c0[0],sx + cv[0] * c1[0],
bt + cv[1]* c0[1],bt + cv[1] * c1[1],
nr,fr);
assert(glGetError()==0);
}
};
#endif