//Open Producer - Copyright (C) 2002 Don Burns
//Distributed under the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE (LGPL)
//as published by the Free Software Foundation.

#include <osgProducer/CameraGroup>

using namespace osgProducer;

CameraGroup::CameraGroup() : Producer::CameraGroup() 
{
    _init();
}

CameraGroup::CameraGroup(Producer::CameraConfig *cfg): Producer::CameraGroup(cfg) 
{
    _init();
}

CameraGroup::CameraGroup(const std::string& configFile) : Producer::CameraGroup(configFile) 
{
    _init();
}

void CameraGroup::_init()
{
    _scene_data = NULL;
    _global_stateset = NULL;
    _background_color.set( 0.2f, 0.2f, 0.4f, 1.0f );
    _LODScale = 1.0f;

    _fusionDistanceMode = osgUtil::SceneView::USE_CAMERA_FUSION_DISTANCE;
    _fusionDistanceValue = 1.0f;

    _initialized = false;

    if (!_frameStamp) _frameStamp = new osg::FrameStamp;

    // set up the maximum number of graphics contexts, before loading the scene graph
    // to ensure that texture objects and display buffers are configured to the correct size.
    osg::DisplaySettings::instance()->setMaxNumberOfGraphicsContexts( getNumberOfCameras() );

}

void CameraGroup::setSceneData( osg::Node *scene ) 
{ 
    if (_scene_data==scene) return;

    if (_scene_decorator.valid() && _scene_data.valid())
    {
        _scene_decorator->removeChild(_scene_data.get());
    }
    
    _scene_data = scene; 
    
    if (_scene_decorator.valid() && _scene_data.valid())
    {
        _scene_decorator->addChild(scene);
    }
        
    setUpSceneViewsWithData();
}
        
void CameraGroup::setSceneDecorator( osg::Group* decorator)
{
    if (_scene_decorator==decorator) return;

    _scene_decorator = decorator;

    if (_scene_data.valid() && decorator) 
    {
        decorator->addChild(_scene_data.get());
    }
    setUpSceneViewsWithData();
}

        
void CameraGroup::setUpSceneViewsWithData()
{
    for(SceneHandlerList::iterator  p = _shvec.begin(); p != _shvec.end(); p++ )
    {
        if (_scene_decorator.valid())
        {
            (*p)->setSceneData( _scene_decorator.get() );
        }
        else if (_scene_data.valid())
        {
            (*p)->setSceneData( _scene_data.get() );

        }
        
        (*p)->setFrameStamp( _frameStamp.get() );
        (*p)->setGlobalStateSet( _global_stateset.get() );
        (*p)->setBackgroundColor( _background_color );
        (*p)->setLODScale( _LODScale );
        (*p)->setFusionDistance( _fusionDistanceMode, _fusionDistanceValue );

    }
}


void CameraGroup::setFrameStamp( osg::FrameStamp* fs )
{
    _frameStamp = fs;
    setUpSceneViewsWithData();
}


void CameraGroup::setGlobalStateSet( osg::StateSet *sset ) 
{ 
    _global_stateset = sset; 
    setUpSceneViewsWithData();
}

void CameraGroup::setBackgroundColor( const osg::Vec4& backgroundColor ) 
{
    _background_color = backgroundColor;
    setUpSceneViewsWithData();
}

void CameraGroup::setLODScale( float scale )
{
    // need to set a local variable?
    _LODScale = scale;
    setUpSceneViewsWithData();
}

void CameraGroup::setFusionDistance( osgUtil::SceneView::FusionDistanceMode mode,float value)
{
    // need to set a local variable?
    _fusionDistanceMode = mode;
    _fusionDistanceValue = value;
    setUpSceneViewsWithData();
}

void CameraGroup::advance()
{
    if( !_initialized ) return;
    CameraGroup::advance();        
}

void CameraGroup::realize( ThreadingModel thread_model)
{
    if( _initialized ) return;


    if (!_ds) _ds = osg::DisplaySettings::instance();

    _ds->setMaxNumberOfGraphicsContexts( _cfg->getNumberOfCameras() );

    for( unsigned int i = 0; i < _cfg->getNumberOfCameras(); i++ )
    {
        Producer::Camera *cam = _cfg->getCamera(i);
        osgProducer::SceneHandler *sh = new osgProducer::SceneHandler(_ds.get());
        sh->setDefaults();
        if( _global_stateset != NULL )
            sh->setGlobalStateSet( _global_stateset.get() );
        if( _scene_data != NULL )
            sh->setSceneData( _scene_data.get() );
        sh->setBackgroundColor( _background_color);
        sh->getState()->setContextID(i);
        sh->setFrameStamp( _frameStamp.get() );
        _shvec.push_back( sh );

        cam->setSceneHandler( sh );
    }


    setUpSceneViewsWithData();

    /// Make all statesets the same as the first.
    if( _global_stateset == NULL && _shvec.size() > 0 )
    {
        SceneHandlerList::iterator p;
        p = _shvec.begin();
        _global_stateset = (*p)->getGlobalStateSet();
        p++;
        for( ; p != _shvec.end(); p++ )
            (*p)->setGlobalStateSet( _global_stateset.get() );
    }


    Producer::CameraGroup::realize( thread_model );        
    _initialized = true;
}

osg::Node* CameraGroup::getTopMostSceneData()
{
    if (_scene_decorator.valid())
        return _scene_decorator.get();
    else
        return _scene_data.get(); 
}

const osg::Node* CameraGroup::getTopMostSceneData() const
{
    if (_scene_decorator.valid())
        return _scene_decorator.get();
    else
        return _scene_data.get(); 
}

void CameraGroup::frame()
{
    osg::Node* node = getTopMostSceneData();
    if (node) node->getBound();

    Producer::CameraGroup::frame();
    _frameStamp->setFrameNumber( _frameStamp->getFrameNumber() + 1 );
}