/*
 * Copyright 2011-2012 Arx Libertatis Team (see the AUTHORS file)
 *
 * This file is part of Arx Libertatis.
 *
 * Arx Libertatis is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Arx Libertatis 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Arx Libertatis.  If not, see <http://www.gnu.org/licenses/>.
 */
/* Based on:
===========================================================================
ARX FATALIS GPL Source Code
Copyright (C) 1999-2010 Arkane Studios SA, a ZeniMax Media company.

This file is part of the Arx Fatalis GPL Source Code ('Arx Fatalis Source Code'). 

Arx Fatalis Source Code is free software: you can redistribute it and/or modify it under the terms of the GNU General Public 
License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Arx Fatalis Source Code 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 General Public License for more details.

You should have received a copy of the GNU General Public License along with Arx Fatalis Source Code.  If not, see 
<http://www.gnu.org/licenses/>.

In addition, the Arx Fatalis Source Code is also subject to certain additional terms. You should have received a copy of these 
additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Arx 
Fatalis Source Code. If not, please request a copy in writing from Arkane Studios at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing Arkane Studios, c/o 
ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
===========================================================================
*/

#ifndef ARX_AUDIO_AUDIOGLOBAL_H
#define ARX_AUDIO_AUDIOGLOBAL_H

#include <stddef.h>
#include <cmath>
#include <algorithm>

#include "audio/AudioTypes.h"
#include "audio/AudioResource.h"

namespace res { class path; }

namespace audio {

class Backend;
class Ambiance;
class Environment;
class Sample;
class Mixer;

const ChannelFlags FLAG_ANY_3D_FX = FLAG_POSITION | FLAG_VELOCITY | FLAG_DIRECTION |
                                    FLAG_CONE | FLAG_FALLOFF | FLAG_REVERBERATION;

// Audio device interface
extern Backend * backend;

// Global settings
extern res::path sample_path;
extern res::path ambiance_path;
extern res::path environment_path;
extern size_t stream_limit_bytes;
extern size_t session_time;

// Resources
extern ResourceList<Mixer> _mixer;
extern ResourceList<Sample> _sample;
extern ResourceList<Ambiance> _amb;
extern ResourceList<Environment> _env;

//! Convert a value from time units to bytes
size_t unitsToBytes(size_t v, const PCMFormat & format, TimeUnit unit = UNIT_MS);

//! Convert a value from bytes to time units
size_t bytesToUnits(size_t v, const PCMFormat & format, TimeUnit unit = UNIT_MS);

inline float LinearToLogVolume(float volume) {
	return 0.2F * (float)log10(volume) + 1.0F;
}

// TODO move to global math header
inline float clamp(float v, float min, float max) {
	return std::min(max, std::max(min, v));
}

} // namespace audio

#endif // ARX_AUDIO_AUDIOGLOBAL_H
