util.h

/*
 * Copyright (c)
 *   2008-2009, Thomas McGuire <thomas.mcguire@student.uni-siegen.de>
 *   2010, Stefan Eilemann <eile@equalizergraphics.com>
 *   2010, Sarah Amsellem <sarah.amsellem@gmail.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of Eyescale Software GmbH nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef UTIL_H
#define UTIL_H

#include <osg/Matrix>
#include <vmmlib/matrix.hpp>

inline osg::Matrix vmmlToOsg( const eq::Matrix4f& matrix )
{
    return osg::Matrix( matrix( 0, 0 ), matrix( 1, 0 ),
                        matrix( 2, 0 ), matrix( 3, 0 ),
                        matrix( 0, 1 ), matrix( 1, 1 ),
                        matrix( 2, 1 ), matrix( 3, 1 ),
                        matrix( 0, 2 ), matrix( 1, 2 ),
                        matrix( 2, 2 ), matrix( 3, 2 ),
                        matrix( 0, 3 ), matrix( 1, 3 ),
                        matrix( 2, 3 ), matrix( 3, 3 ));
}

inline eq::Vector3f orthographicVector( const eq::Vector3f &vector )
{
    vmml::vector<3,float> result;
    float x = vector.x();
    float z = vector.z();

    result( 0 ) = z;
    result( 2 ) = -x;
    result( 1 ) = 0;

    return result;
}

#if 0

inline vmml::vector<3,float> norm( const vmml::vector<3,float> &vector )
{
    float length = sqrt( vector.x() * vector.x() +
                         vector.y() * vector.y() +
                         vector.z() * vector.z( ));

    return ( vector / length );
}
#endif

#endif