OSGSpotLight.cpp

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/*---------------------------------------------------------------------------*\
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
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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 "OSGSpotLight.h"

OSG_USING_NAMESPACE

/*----------------------------- class variables ---------------------------*/

StatElemDesc<StatIntElem>  SpotLight::statNSpotLights(
"NSpotLights", "number of spot light sources");

/*-------------------------------------------------------------------------*/
/*                             Changed                                     */

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

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

void SpotLight::makeChunk(void)
{
    Inherited::makeChunk();

    Vec4f pos(_sfPosition.getValue ());

    pos[3] = 1;

    _pChunk->setPosition (pos                     );
    _pChunk->setDirection(getDirection         () );

    _pChunk->setExponent (getSpotExponent      () );
    _pChunk->setCutoff   (rad2deg(getSpotCutOff()));
}

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

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

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

SpotLight::SpotLight(void) :
    Inherited()
{
}

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

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

SpotLight::~SpotLight(void)
{
}

/*-------------------------------------------------------------------------*/
/*                               Drawing                                   */

Action::ResultE SpotLight::drawEnter(Action *action)
{   
    if(getOn() == false)
        return Action::Continue;

    DrawAction *da    = dynamic_cast<DrawAction *>(action);
    GLenum      light = GL_LIGHT0 + da->getLightCount();
    
    Light::drawEnter(action);

    Vec4f  dir(_sfDirection.getValue());
    Vec4f  pos(_sfPosition .getValue());

    pos[3] = 1;
    dir[3] = 0;

    Real32 deg = rad2deg(_sfSpotCutOff.getValue());

    if(deg > 90.f) 
        deg = 180.f;

    glLightfv(light, GL_POSITION      ,  pos.getValues()          );
    glLightfv(light, GL_SPOT_DIRECTION,  dir.getValues()          );

    glLightf (light, GL_SPOT_CUTOFF   ,  deg                      );
    glLightf (light, GL_SPOT_EXPONENT , _sfSpotExponent.getValue());

    glPopMatrix();

    da->getStatistics()->getElem(SpotLight::statNSpotLights)->inc();

    return Action::Continue;
}
    
Action::ResultE SpotLight::drawLeave(Action *action)
{
    if(getOn() == false)
        return Action::Continue;

    return Light::drawLeave(action);
}

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

Action::ResultE SpotLight::renderEnter(Action *action)
{
    if(getOn() == false)
        return Action::Continue;

    DrawActionBase *da    = dynamic_cast<DrawActionBase *>(action);
    da->getStatistics()->getElem(SpotLight::statNSpotLights)->inc();

    return PointLight::renderEnter(action);
}

Action::ResultE SpotLight::renderLeave(Action *action)
{
    if(getOn() == false)
        return Action::Continue;

    return PointLightBase::renderLeave(action);
}

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

void SpotLight::initMethod (void)
{
    DrawAction::registerEnterDefault( 
        getClassType(), 
        osgTypedMethodFunctor2BaseCPtrRef<
            Action::ResultE,
            SpotLightPtr    , 
            CNodePtr        ,  
            Action         *>(&SpotLight::drawEnter));

    DrawAction::registerLeaveDefault( 
        getClassType(), 
        osgTypedMethodFunctor2BaseCPtrRef<
            Action::ResultE,
            SpotLightPtr    , 
            CNodePtr        ,  
            Action         *>(&SpotLight::drawLeave));

    RenderAction::registerEnterDefault(
        getClassType(), 
        osgTypedMethodFunctor2BaseCPtrRef<
            Action::ResultE,
            SpotLightPtr    , 
            CNodePtr        ,  
            Action         *>(&SpotLight::renderEnter));

    RenderAction::registerLeaveDefault( 
        getClassType(), 
        osgTypedMethodFunctor2BaseCPtrRef<
            Action::ResultE,
            SpotLightPtr    , 
            CNodePtr        ,  
            Action         *>(&SpotLight::renderLeave));
}


/*-------------------------------------------------------------------------*/
/*                              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[] = OSGSPOTLIGHT_HEADER_CVSID;
    static Char8 cvsid_inl[] = OSGSPOTLIGHT_INLINE_CVSID;
}

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