OSGProjectionCameraDecorator.cpp

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/*---------------------------------------------------------------------------*\
 *                                OpenSG                                     *
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 *             Copyright (C) 2000-2002 by the OpenSG Forum                   *
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 *                                                                           *
\*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*\
 *                                License                                    *
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 * This library is free software; you can redistribute it and/or modify it   *
 * under the terms of the GNU Library General Public License as published    *
 * by the Free Software Foundation, version 2.                               *
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 * WITHOUT ANY WARRANTY; without even the implied warranty of                *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
 * Library General Public License for more details.                          *
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\*---------------------------------------------------------------------------*/

//---------------------------------------------------------------------------
//  Includes
//---------------------------------------------------------------------------

#include <stdlib.h>
#include <stdio.h>

#include <OSGConfig.h>

#include <OSGMatrixUtility.h>
#include <OSGQuaternion.h>
#include <OSGNode.h>

#include "OSGProjectionCameraDecorator.h"

OSG_USING_NAMESPACE

/***************************************************************************\
 *                            Description                                  *
\***************************************************************************/

/*----------------------- constructors & destructors ----------------------*/

ProjectionCameraDecorator::ProjectionCameraDecorator(void) :
    Inherited()
{
}

ProjectionCameraDecorator::ProjectionCameraDecorator(const ProjectionCameraDecorator &source) :
    Inherited(source)
{
}

ProjectionCameraDecorator::~ProjectionCameraDecorator(void)
{
}

/*----------------------------- class specific ----------------------------*/

void ProjectionCameraDecorator::initMethod (void)
{
}

void ProjectionCameraDecorator::changed(BitVector whichField, UInt32 origin)
{
    Inherited::changed(whichField, origin);
    
    if(whichField & SurfaceFieldMask)
        updateData();
}

void ProjectionCameraDecorator::dump(      UInt32    , 
                         const BitVector ) const
{
    SLOG << "Dump ProjectionCameraDecorator NI" << std::endl;
}

void ProjectionCameraDecorator::updateData(void)
{
    if(getSurface().size() != 4)
    {
        FWARNING(("ProjectionCameraDecorator: only defined for 4 point "
                  "surfaces!\n"));
        return;
    }

    Pnt3f p0(getSurface()[0]);
    Vec3f d1,d2,n;
    
    d1 = getSurface()[1] - p0;
    d2 = getSurface()[3] - p0;
    
    n = d1.cross(d2);
    if(n.isZero())
    {
        FWARNING(("ProjectionCameraDecorator: normal is zero, surface "
                  "ill-defined!\n"));
        return;
    }
    
    ProjectionCameraDecoratorPtr ptr(this);
    beginEditCP(ptr, LeftFieldMask  | BottomFieldMask | NormalFieldMask |
                     WidthFieldMask | HeightFieldMask );
    ptr->setLeft  (Plane(d1,p0));
    ptr->setBottom(Plane(d2,p0));
    ptr->setNormal(Plane(n ,p0));
    ptr->setWidth (d1.length());
    ptr->setHeight(d2.length());
    endEditCP  (ptr, LeftFieldMask  | BottomFieldMask | NormalFieldMask |
                     WidthFieldMask | HeightFieldMask );
    
} 


void ProjectionCameraDecorator::getViewing(Matrix &result, 
                        UInt32  OSG_CHECK_ARG(width ),
                        UInt32  OSG_CHECK_ARG(height))
{
    if ( getUser() == NullFC )
    {
        FWARNING(("ProjectionCameraDecorator::getViewing: no user!"));
        result.setIdentity();
        return;
    }   

    getUser()->getToWorld( result );  
    result.invert();
}

void ProjectionCameraDecorator::getProjection(Matrix &result, 
                        UInt32  OSG_CHECK_ARG(width ),
                        UInt32  OSG_CHECK_ARG(height))
{
    CameraPtr camera = getDecoratee();
    
    if(camera == NullFC)
    {
        FWARNING(("ProjectionCameraDecorator::getProjection: no decoratee!\n"));
        result.setIdentity();
        return;
    }
    
    Matrix cam,user;
    
    camera->getBeacon()->getToWorld(cam);
    getUser()->getToWorld(user);    
    cam.invert();
    
    cam.mult(user);
    
    Pnt3f viewer(cam[3]);
    
    Real32 eyeFac;
    
    if(getLeftEye())
    {
        eyeFac=-.5;
    }
    else
    {
        eyeFac=+.5;
    }
    
    viewer += Vec3f(cam[0]) * eyeFac * getEyeSeparation();
      
    Real32 dist = getNormal().distance(viewer),
           dl   = getLeft  ().distance(viewer),
           db   = getBottom().distance(viewer),
           f    = camera->getNear() / dist;
    
    MatrixFrustum(result, -dl * f, (getWidth ()-dl) * f,
                          -db * f, (getHeight()-db) * f,
                          camera->getNear(), camera->getFar() );
}                                       


void ProjectionCameraDecorator::getProjectionTranslation(Matrix &result, 
                        UInt32  OSG_CHECK_ARG(width ),
                        UInt32  OSG_CHECK_ARG(height))
{
    CameraPtr camera = getDecoratee();
    
    if(camera == NullFC)
    {
        FFATAL(("ProjectionCameraDecorator::getProjectionTranslation: "
                "no decoratee!\n"));
        result.setIdentity();
        return;
    }
    
    Matrix cam,user;
    
    camera->getBeacon()->getToWorld(cam);
    getUser()->getToWorld(user);
    
    cam.invert();
    cam.mult(user);
    
    Vec3f dir(getNormal().getNormal()),
          up (getBottom().getNormal()),
          right;
    Vec3f pos(cam[3]);
    
    Real32 eyeFac;
    
    if(getLeftEye())
    {
        eyeFac=-.5;
    }
    else
    {
        eyeFac=+.5;
    }
    
    pos += Vec3f(cam[0]) * eyeFac * getEyeSeparation();
    
    right = up.cross(dir);
    up = dir.cross(right);
    
    result.setIdentity();
    result.setValue(right, up, dir, pos);
    result.invert();

    result.mult(cam);
#if 0
static bool hack = true;
    Quaternion q( getNormal().getNormal(), Vec3f(0,0,1));    
 
    Vec3f v;
    Real32 a;
    q.getValueAsAxisDeg(v,a);
   
    // HACKKK
    if(hack && a > 50)
    {
        q.getValue(result);   
        
        Real32 ang1 = 54.44;
        Real32 ang2 = 6.27;
        
        if(v[1] < 0)    ang1 = -ang1;
        
        Quaternion q1,q2;
        Matrix m1,m2;
        
        q1.setValueAsAxisDeg(0,1,0,ang1);
        q2.setValueAsAxisDeg(1,0,0,ang2);
        
        q1.getValue(m1);
        q2.getValue(m2);
        
        result = m2;
        result.mult(m1);
    } 
#endif 
}                                       


/*-------------------------------------------------------------------------*/
/*                              cvs id's                                   */

#ifdef __sgi
#pragma set woff 1174
#endif

#ifdef OSG_LINUX_ICC
#pragma warning( disable : 177 )
#endif

namespace
{
    static char cvsid_cpp[] = "@(#)$Id: $";
    static char cvsid_hpp[] = OSGPROJECTIONCAMERADECORATOR_HEADER_CVSID;
    static char cvsid_inl[] = OSGPROJECTIONCAMERADECORATOR_INLINE_CVSID;
}

---