/* -*-c++-*- osgVisual - Copyright (C) 2009-2010 Torben Dannhauer
 *
 * This library is based on OpenSceneGraph, 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.
 *
 * osgVisual requires for some proprietary modules a license from the correspondig manufacturer.
 * You have to aquire licenses for all used proprietary modules.
 * 
 * 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 "visual_vista2D.h"


using namespace osgVisual;

visual_vista2D::visual_vista2D(void)
{
   // Create a Vista2D View
   view = new Vista2D::VistaView();
}

visual_vista2D::~visual_vista2D(void)
{
}

void visual_vista2D::init(std::string vista2DFilename_)
{	
    /***************
    load view
    ***************/
	view->load( vista2DFilename_ );
    view->setBackgroundMode(false);	// don't paint background
	view->setPosition(800,450);
	view->setZoom( 0.5 );

    /***************
    start animation with
    self running datasource
    ***************/
    view->startView (true);

}

bool visual_vista2D::createVistaOverlay( std::string vista2DFilename_, osg::CoordinateSystemNode *sceneGraphRoot_ )
{
	// Check if Vista2D file exist
	if (! osgDB::fileExists( vista2DFilename_ ) )
	{
		osg::notify( osg::WARN ) << "WARNING: Could not find specified Vista2D projectfile. Skip adding Vista2D project." << std::endl;
		return false;
	}

   osg::Geode* vista2Dgeode = new osg::Geode();
   // Projection node for defining view frustrum for the vista2D-SceneOverlay:
   osg::Projection* vista2DProjectionMatrix = new osg::Projection;

    // Initialize the projection matrix for viewing everything we
   // will add as descendants of this node. Use screen coordinates
   // to define the horizontal and vertical extent of the projection
   // matrix. Positions described under this node will equate to
   // pixel coordinates.
   vista2DProjectionMatrix->setMatrix(osg::Matrix::ortho2D(0,1600,0,900)); /** todo: use screen size dynamically. */
  
   // For the HUD model view matrix use an identity matrix:
   osg::MatrixTransform* vista2DModelViewMatrix = new osg::MatrixTransform;
   vista2DModelViewMatrix->setMatrix(osg::Matrix::identity());

   // Make sure the model view matrix is not affected by any transforms
   // above it in the scene graph:
   vista2DModelViewMatrix->setReferenceFrame(osg::Transform::ABSOLUTE_RF);

   // Set Stateset of vista2DGeode Renderbin to render quite late..
	osg::StateSet* vista2DoverlayStateSet = vista2Dgeode->getOrCreateStateSet();
	vista2DoverlayStateSet->setRenderBinDetails( 99, "RenderBin");

   // Add the HUD projection matrix as a child of the root node
   // and the HUD model view matrix as a child of the projection matrix
   // Anything under this node will be viewed using this projection matrix
   // and positioned with this model view matrix.
   vista2DProjectionMatrix->addChild(vista2DModelViewMatrix);

   // Add the Geometry node to contain HUD geometry as a child of the
   // HUD model view matrix.
   vista2DModelViewMatrix->addChild( vista2Dgeode );

	// Add Payload: Vista2D			
	osg::ref_ptr<visual_vista2D> vista2D = new visual_vista2D();
	vista2D->init( vista2DFilename_ );

	vista2D.get()->setUseDisplayList( false );
	vista2Dgeode->addDrawable( vista2D.get() );

	sceneGraphRoot_->addChild( vista2DProjectionMatrix );
	return true;
}

void visual_vista2D::drawImplementation(osg::RenderInfo& renderInfo) const
{
	// save OSG-State
	osg::ref_ptr<osg::StateSet> clonedStateSet = reinterpret_cast<osg::StateSet*>( renderInfo.getCurrentCamera()->getOrCreateStateSet()->clone(osg::CopyOp::DEEP_COPY_ALL) );

	// Draw View
    view->draw();

	// restore OSG-State
	renderInfo.getCurrentCamera()->setStateSet( clonedStateSet );

}

osg::Object* visual_vista2D::cloneType() const
{
	return NULL;
}

osg::Object* visual_vista2D::clone(const osg::CopyOp& copyop) const
{ 
	return NULL;
}