/* -*-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 <osg/Texture2D>
#include <osg/CoordinateSystemNode>
#include <osg/TexEnv>
#include <osg/io_utils>

#include <osgUtil/CullVisitor>
#include <osgShadow/ShadowedScene>

using namespace osgShadow;

ShadowedScene::ShadowedScene(ShadowTechnique* st):
    _receivesShadowTraversalMask(0xffffffff),
    _castsShadowTraversalMask(0xffffffff)
{
    setNumChildrenRequiringUpdateTraversal(1);
    
    if (st) setShadowTechnique(st);    
}

ShadowedScene::ShadowedScene(const ShadowedScene& copy, const osg::CopyOp& copyop):
    osg::Group(copy,copyop),
    _receivesShadowTraversalMask(copy._receivesShadowTraversalMask),
    _castsShadowTraversalMask(copy._castsShadowTraversalMask)    
{
    setNumChildrenRequiringUpdateTraversal(getNumChildrenRequiringUpdateTraversal()+1);
    
    if (copy._shadowTechnique.valid())
    {
        setShadowTechnique( dynamic_cast<osgShadow::ShadowTechnique*>(copy._shadowTechnique->clone(copyop)) );
    }
    
}

ShadowedScene::~ShadowedScene()
{
    setShadowTechnique(0);
}

void ShadowedScene::traverse(osg::NodeVisitor& nv)
{
    if (_shadowTechnique.valid())
    {
        _shadowTechnique->traverse(nv);
    }
    else
    {
        osg::Group::traverse(nv);
    }
}

void ShadowedScene::setShadowTechnique(ShadowTechnique* technique)
{
    if (_shadowTechnique == technique) return;
    
    if (_shadowTechnique.valid()) 
    {
        _shadowTechnique->cleanSceneGraph();
        _shadowTechnique->_shadowedScene = 0;
    }
    
    _shadowTechnique = technique;
    
    if (_shadowTechnique.valid())
    {
        _shadowTechnique->_shadowedScene = this;
        _shadowTechnique->dirty();
    }
}

void ShadowedScene::cleanSceneGraph()
{
    if (_shadowTechnique.valid()) 
    {
        _shadowTechnique->cleanSceneGraph();
    }
}


void ShadowedScene::dirty()
{
    if (_shadowTechnique.valid())
    {
        _shadowTechnique->dirty();
    }
}