OSGLight.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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 * 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.                          *
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 * You should have received a copy of the GNU Library General Public         *
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\*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*\
 *                                Changes                                    *
 *                                                                           *
 *                                                                           *
 *                                                                           *
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\*---------------------------------------------------------------------------*/

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

#include "OSGConfig.h"

#include <OSGGL.h>

#include <OSGDrawAction.h>
#include <OSGRenderAction.h>
#include "OSGLight.h"

OSG_USING_NAMESPACE

/*-------------------------------------------------------------------------*/
/*                                Set                                      */

void Light::setAmbient(Real32 rRed, 
                       Real32 rGreen, 
                       Real32 rBlue, 
                       Real32 rAlpha)
{
    _sfAmbient.getValue().setValuesRGBA(rRed, rGreen, rBlue, rAlpha);
}

void Light::setDiffuse(Real32 rRed, 
                       Real32 rGreen, 
                       Real32 rBlue, 
                       Real32 rAlpha)
{
    _sfDiffuse.getValue().setValuesRGBA(rRed, rGreen, rBlue, rAlpha);
}

void Light::setSpecular(Real32 rRed, 
                        Real32 rGreen, 
                        Real32 rBlue, 
                        Real32 rAlpha)
{
    _sfSpecular.getValue().setValuesRGBA(rRed, rGreen, rBlue, rAlpha);
}

/*-------------------------------------------------------------------------*/
/*                             Chunk                                       */

LightChunkPtr Light::getChunk(void)
{
    return _pChunk;
}

void Light::makeChunk(void)
{
    if(_pChunk == NullFC)
    {
        _pChunk = LightChunk::create();
    }

    _pChunk->setAmbient (getAmbient ());
    _pChunk->setDiffuse (getDiffuse ());
    _pChunk->setSpecular(getSpecular());
}

/*-------------------------------------------------------------------------*/
/*                             Sync                                     */

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


/*-------------------------------------------------------------------------*/
/*                                Dump                                     */

void Light::dump(      UInt32    uiIndent, 
                     const BitVector bvFlags) const
{
   Inherited::dump(uiIndent, bvFlags);
}

/*-------------------------------------------------------------------------*/
/*                            Constructors                                 */

Light::Light(void) :
     Inherited(),
    _pChunk   (NullFC)
{
}

Light::Light(const Light &source) :
     Inherited(source),
    _pChunk   (source._pChunk)
{
}

/*-------------------------------------------------------------------------*/
/*                             Destructor                                  */

Light::~Light(void)
{
    if(_pChunk != NullFC)
        subRefCP(_pChunk);
}

/*-------------------------------------------------------------------------*/
/*                               Drawing                                   */
    
Action::ResultE Light::drawEnter(Action *action)
{
    DrawAction *da    = dynamic_cast<DrawAction *>(action);
    GLenum      light = GL_LIGHT0 + da->getLightCount();
    
    da->incLightCount();
    
    glEnable (light);
    
    glLightfv(light, GL_DIFFUSE , _sfDiffuse. getValue().getValuesRGBA());
    glLightfv(light, GL_AMBIENT , _sfAmbient. getValue().getValuesRGBA());
    glLightfv(light, GL_SPECULAR, _sfSpecular.getValue().getValuesRGBA());

    glLightf( light, 
              GL_CONSTANT_ATTENUATION, 
             _sfConstantAttenuation.getValue() );
    glLightf( light,
              GL_LINEAR_ATTENUATION,   
             _sfLinearAttenuation.getValue()   );
    glLightf( light,
              GL_QUADRATIC_ATTENUATION,   
             _sfQuadraticAttenuation.getValue());

    // add the matrix to get into the beacon's coordinate system onto the stack

    Matrix fromworld;
    Matrix tobeacon;

    action->getActNode()->getToWorld(fromworld);
    fromworld.invert();

    NodePtr beacon = getBeacon();

    if(beacon == NullFC)
    {
        SINFO << "draw: no beacon set!" << std::endl;

        glPushMatrix();
    }
    else
    {
        getBeacon()->getToWorld(tobeacon);
    
        tobeacon.mult(fromworld);
    
        glPushMatrix();
        glMultMatrixf(tobeacon.getValues());
    }
    
    da->selectVisibles();
    
    return Action::Continue;
}
    
Action::ResultE Light::drawLeave(Action *action)
{
    DrawAction *da = dynamic_cast<DrawAction *>(action);
     
    da->decLightCount();

    GLenum light = GL_LIGHT0 + da->getLightCount();
   
    glDisable(light);
   
    return Action::Continue;
}

/*-------------------------------------------------------------------------*/
/*                             Rendering                                   */

Action::ResultE Light::renderEnter(Action *action)
{
    RenderAction *pAction = dynamic_cast<RenderAction *>(action);

    pAction->dropLight(this);

    return Action::Continue;
}

Action::ResultE Light::renderLeave(Action *action)
{
    RenderAction *pAction = dynamic_cast<RenderAction *>(action);

    pAction->undropLight(this);

    return Action::Continue;
}

/*-------------------------------------------------------------------------*/
/*                               Init                                      */


void Light::initMethod(void)
{
}


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

#ifdef __sgi
#pragma set woff 1174
#endif

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

namespace
{
    static Char8 cvsid_cpp[] = "@(#)$Id: $";
    static Char8 cvsid_hpp[] = OSGLIGHT_HEADER_CVSID;
    static Char8 cvsid_inl[] = OSGLIGHT_INLINE_CVSID;
}

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