/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * 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 
 * OpenSceneGraph Public License for more details.
*/

#include "LightPointSpriteDrawable.h"

#include <osg/Point>

using namespace osgSim;

LightPointSpriteDrawable::LightPointSpriteDrawable():
    osgSim::LightPointDrawable()
{
    _sprite = new osg::PointSprite;
}

LightPointSpriteDrawable::LightPointSpriteDrawable(const LightPointSpriteDrawable& lpsd,const osg::CopyOp& copyop):
    osgSim::LightPointDrawable(lpsd,copyop)
{
}

void LightPointSpriteDrawable::drawImplementation(osg::State& state) const
{

    if (!state.getModeValidity(GL_POINT_SPRITE_ARB))
    {
        LightPointDrawable::drawImplementation(state);
        return;
    }

    state.applyMode(GL_POINT_SMOOTH,true);
    state.applyMode(GL_BLEND,true);
    state.applyMode(GL_LIGHTING,false);
    state.applyTextureMode(0,GL_TEXTURE_2D,true);

    state.applyMode(GL_POINT_SPRITE_ARB,true);
    state.applyTextureAttribute(0,_sprite.get());
    // Assume the point sprite texture map is already specified
    // (typically in the owning LightPointNode StateSet).


    glHint(GL_POINT_SMOOTH_HINT,GL_NICEST);

    state.applyAttribute(_depthOn.get());

    state.applyAttribute(_blendOneMinusSrcAlpha.get());
    state.applyMode(GL_POINT_SMOOTH,true);

    SizedLightPointList::const_iterator sitr;
    unsigned int pointsize;
    for(pointsize=1,sitr=_sizedOpaqueLightPointList.begin();
        sitr!=_sizedOpaqueLightPointList.end();
        ++sitr,++pointsize)
    {

        const LightPointList& lpl = *sitr;
        if (!lpl.empty())
        {
            glPointSize(pointsize);
            //glInterleavedArrays(GL_C4UB_V3F,0,&lpl.front());
            state.setInterleavedArrays(GL_C4UB_V3F,0,&lpl.front());
            glDrawArrays(GL_POINTS,0,lpl.size());
        }
    }

    state.applyMode(GL_BLEND,true);
    state.applyAttribute(_depthOff.get());


    state.applyAttribute(_blendOneMinusSrcAlpha.get());

    for(pointsize=1,sitr=_sizedBlendedLightPointList.begin();
        sitr!=_sizedBlendedLightPointList.end();
        ++sitr,++pointsize)
    {

        const LightPointList& lpl = *sitr;
        if (!lpl.empty())
        {
            glPointSize(pointsize);
            //glInterleavedArrays(GL_C4UB_V3F,0,&lpl.front());
            state.setInterleavedArrays(GL_C4UB_V3F,0,&lpl.front());
            glDrawArrays(GL_POINTS,0,lpl.size());
        }
    }


    state.applyAttribute(_blendOne.get());    

    for(pointsize=1,sitr=_sizedAdditiveLightPointList.begin();
        sitr!=_sizedAdditiveLightPointList.end();
        ++sitr,++pointsize)
    {

        const LightPointList& lpl = *sitr;
        if (!lpl.empty())
        {
            //state.applyMode(GL_POINT_SMOOTH,pointsize!=1);
            glPointSize(pointsize);
            //glInterleavedArrays(GL_C4UB_V3F,0,&lpl.front());
            state.setInterleavedArrays(GL_C4UB_V3F,0,&lpl.front());
            glDrawArrays(GL_POINTS,0,lpl.size());
        }
    }

    glPointSize(1);
    
    glHint(GL_POINT_SMOOTH_HINT,GL_FASTEST);

    state.haveAppliedAttribute(osg::StateAttribute::POINT);
    
    state.dirtyAllVertexArrays();
    state.disableAllVertexArrays();
    
    // restore the state afterwards.
    state.apply();

}