OSGCamera.cpp

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/*---------------------------------------------------------------------------*\
 *                                OpenSG                                     *
 *                                                                           *
 *                                                                           *
 *             Copyright (C) 2000-2002 by the OpenSG Forum                   *
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 *                            www.opensg.org                                 *
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 *   contact: dirk@opensg.org, gerrit.voss@vossg.org, jbehr@zgdv.de          *
 *                                                                           *
\*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*\
 *                                License                                    *
 *                                                                           *
 * 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.                               *
 *                                                                           *
 * This library 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         *
 * Library General Public License for more details.                          *
 *                                                                           *
 * You should have received a copy of the GNU Library General Public         *
 * License along with this library; if not, write to the Free Software       *
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                 *
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\*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*\
 *                                Changes                                    *
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\*---------------------------------------------------------------------------*/

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

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

#include "OSGConfig.h"
#include "OSGLog.h"

#include <OSGGL.h>

#include "OSGNode.h"
#include "OSGFieldContainerPtr.h"
#include "OSGViewport.h"
#include "OSGWindow.h"
#include "OSGCamera.h"

OSG_USING_NAMESPACE


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

/***************************************************************************\
 *                           Class methods                                 *
\***************************************************************************/

void Camera::initMethod (void)
{
}

/***************************************************************************\
 *                           Instance methods                              *
\***************************************************************************/

Camera::Camera(void) :
    Inherited()
{
}

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

Camera::~Camera(void)
{
}

void Camera::changed(BitVector whichField, UInt32 origin)
{
    Inherited::changed(whichField, origin);
}
    

/*-------------------------- your_category---------------------------------*/

void Camera::setup(      DrawActionBase *OSG_CHECK_ARG(action), 
                   const Viewport       &port                 )
{
    Matrix m, t;

    // set the projection

    getProjection           ( m, port.getPixelWidth(), port.getPixelHeight() );
    getProjectionTranslation( t, port.getPixelWidth(), port.getPixelHeight() );

    m.mult(t);

    //SDEBUG << "Projection matrix: " << m << std::endl;

    glMatrixMode( GL_PROJECTION );
    glLoadMatrixf( m.getValues() );

    // set the viewing

    getViewing( m, port.getPixelWidth(), port.getPixelHeight() );

    //SDEBUG << "Viewing matrix: " << m << std::endl;
    
    glMatrixMode( GL_MODELVIEW );
    glLoadMatrixf( m.getValues() );
}

void Camera::setupProjection(      DrawActionBase *OSG_CHECK_ARG(action),
                             const Viewport       &port                 )
{
    Matrix m, t;

    // set the projection

    getProjection           ( m, port.getPixelWidth(), port.getPixelHeight() );
    getProjectionTranslation( t, port.getPixelWidth(), port.getPixelHeight() );

    m.mult(t);

    //SDEBUG << "Projection matrix: " << m << std::endl;

    glMatrixMode( GL_PROJECTION );
    glLoadMatrixf( m.getValues() );
}

void Camera::draw(      DrawAction *OSG_CHECK_ARG(action), 
                  const Viewport   &OSG_CHECK_ARG(port  ))
{
}

void Camera::getProjection(Matrix &OSG_CHECK_ARG(result),
                           UInt32  OSG_CHECK_ARG(width ),
                           UInt32  OSG_CHECK_ARG(height))
{
    SFATAL << "Camera::getProjection: NIY" << std::endl;
    abort();
}

void Camera::getProjectionTranslation(Matrix &result, 
                                      UInt32  OSG_CHECK_ARG(width ), 
                                      UInt32  OSG_CHECK_ARG(height))
{
    result.setIdentity();
}

void Camera::getViewing(Matrix &result, 
                        UInt32  OSG_CHECK_ARG(width ),
                        UInt32  OSG_CHECK_ARG(height))
{
    if (getBeacon() == NullFC)
    {
        SWARNING << "Camera::setup: no beacon!" << std::endl;
        return;
    }   

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

void Camera::getFrustum(FrustumVolume& result, const Viewport& p)
{
    Matrix mv,prt,pr;
    
    getProjection           (pr , p.getPixelWidth(), p.getPixelHeight());
    getProjectionTranslation(prt, p.getPixelWidth(), p.getPixelHeight());
    getViewing              (mv , p.getPixelWidth(), p.getPixelHeight());

    pr.mult(prt);
    pr.mult(mv );
    
    result.setPlanes(pr);
}

void Camera::getWorldToScreen(Matrix &result, const Viewport& p)
{
    Matrix mv,prt,pr;
    
    getProjection           (result, p.getPixelWidth(), p.getPixelHeight());
    getProjectionTranslation(prt   , p.getPixelWidth(), p.getPixelHeight());
    getViewing              (mv    , p.getPixelWidth(), p.getPixelHeight());

    result.mult(prt);
    result.mult(mv );
}

bool Camera::calcViewRay(Line & line, Int32 x, Int32 y, const Viewport& port)
{
    if(port.getPixelWidth() <= 0 || port.getPixelHeight() <= 0)
    {
        return false;
    }
    
    Matrix proj, projtrans, view;

    getProjection(proj, port.getPixelWidth(), port.getPixelHeight());
    getProjectionTranslation(projtrans, port.getPixelWidth(), 
                                port.getPixelHeight());
    getViewing(view, port.getPixelWidth(), port.getPixelHeight());
    
    Matrix wctocc = proj;
    wctocc.mult(projtrans);
    wctocc.mult(view);

    Matrix cctowc;
    cctowc.invertFrom(wctocc);
       
    Real32  rx = (x - port.getPixelLeft()) / (Real32) port.getPixelWidth()
                    * 2.f - 1.f,
            ry = 1.f - ((y - (port.getParent()->getHeight() - 
                              port.getPixelTop())
                        ) / 
                        (Real32) port.getPixelHeight()
                       ) * 2.f;
    
    view.invert();
    Pnt3f from(view[3][0], view[3][1], view[3][2]);
            
    Pnt3f at;
    cctowc.multFullMatrixPnt(Pnt3f(rx, ry, 1), at);
    
    line.setValue(from, at-from);
    
    return true;
}

/*------------------------------- dump ----------------------------------*/

void Camera::dump(      UInt32    OSG_CHECK_ARG(uiIndent), 
                  const BitVector OSG_CHECK_ARG(bvFlags )) const
{
    SLOG << "Dump Camera NI" << std::endl;
}


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

#ifdef OSG_SGI_CC
#pragma set woff 1174
#endif

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

namespace
{
    static Char8 cvsid_cpp       [] = "@(#)$Id: FCTemplate_cpp.h,v 1.13 2002/06/01 10:37:25 vossg Exp $";
    static Char8 cvsid_hpp       [] = OSGCAMERA_HEADER_CVSID;
    static Char8 cvsid_inl       [] = OSGCAMERA_INLINE_CVSID;

    static Char8 cvsid_fields_hpp[] = OSGCAMERAFIELDS_HEADER_CVSID;
}

#ifdef __sgi
#pragma reset woff 1174
#endif

---