audio/engine.cpp

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/******************************************************************************
 * This file is part of the Gluon Development Platform
 * Copyright (C) 2009 Sacha Schutz <istdasklar@free.fr>
 * Copyright (C) 2009 Guillaume Martres <smarter@ubuntu.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * 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 GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "engine.h"
#include "device_p.h"

#include <QtCore/QDebug>
#include <QtGui/QVector3D>
#include <al.h>
#include <alc.h>
#ifndef Q_WS_MAC
#include <alext.h>
#endif

using namespace GluonAudio;

template<> Engine* GluonCore::Singleton<Engine>::m_instance = 0;

Engine::Engine()
{
    m_context = 0;
    m_device = 0;
    setDevice( "" );

    qDebug() << alGetError();
}

Engine::~Engine()
{
    alcMakeContextCurrent( 0 );
    alcDestroyContext( m_context );
    alcCloseDevice( m_device );
}

QStringList Engine::deviceList()
{
    if( !Device::isExtensionPresent( "ALC_ENUMERATION_EXT" ) )
    {
        return QStringList();
    }

    if( Device::isExtensionPresent( "ALC_ENUMERATE_ALL_EXT" ) )
    {
        return Device::contextOption( ALC_ALL_DEVICES_SPECIFIER );
    }
    else
    {
        return Device::contextOption( ALC_DEVICE_SPECIFIER );
    }
}

bool Engine::setDevice( const QString& deviceName )
{
    if( m_device )
    {
        alcMakeContextCurrent( 0 );
        alcDestroyContext( m_context );
    }

    if( !deviceName.isEmpty() )
    {
        m_device = alcOpenDevice( deviceName.toUtf8() );
    }
    else
    {
        m_device = alcOpenDevice( 0 );
    }

    if( !m_device )
    {
        return false;
    }

    m_context = alcCreateContext( m_device, 0 );

    if( !m_context )
    {
        return false;
    }

    if( !alcMakeContextCurrent( m_context ) )
    {
        return false;
    }

    return true;
}

QVector3D Engine::listenerPosition()
{
    ALfloat listener[3];
    alGetListenerfv( AL_POSITION, listener );


    return QVector3D( listener[0], listener[1], listener[2] );

}

void Engine::setListenerPosition( const QVector3D& position )
{
    alListener3f( AL_POSITION, position.x(), position.y(), position.z() );
}

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