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selove / src / modules / audio / openal / Pool.h

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/**
* Copyright (c) 2006-2012 LOVE Development Team
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
*    claim that you wrote the original software. If you use this software
*    in a product, an acknowledgment in the product documentation would be
*    appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
*    misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
**/

#ifndef LOVE_AUDIO_OPENAL_POOL_H
#define LOVE_AUDIO_OPENAL_POOL_H

// STD
#include <queue>
#include <map>
#include <iostream>
#include <cmath>

// LOVE
#include <common/config.h>
#include <common/Exception.h>
#include <thread/threads.h>

// OpenAL
#ifdef LOVE_MACOSX
#include <OpenAL/alc.h>
#include <OpenAL/al.h>
#else
#include <AL/alc.h>
#include <AL/al.h>
#endif

namespace love
{
namespace audio
{
namespace openal
{

	class Source;

	class Pool
	{
	private:

		// Number of OpenAL sources.
		static const int NUM_SOURCES = 64;

		// OpenAL sources
		ALuint sources[NUM_SOURCES];

		// A queue of available sources.
		std::queue<ALuint> available;

		// A map of playing sources.
		std::map<Source *, ALuint> playing;

		// Only one thread can access this object at the same time. This mutex will
		// make sure of that.
		thread::Mutex* mutex;

	public:

		Pool();
		~Pool();

		/**
		* Checks whether an OpenAL source is available.
		* @return True if at least one is available, false otherwise.
		**/
		bool isAvailable() const;

		/**
		* Checks whether a Source is currently in the playing list.
		**/
		bool isPlaying(Source * s);

		void update();

		int getNumSources() const;
		int getMaxSources() const;

		bool play(Source * source, ALuint & out);
		void stop();
		void stop(Source * source);
		void pause();
		void pause(Source * source);
		void resume();
		void resume(Source * source);
		void rewind();
		void rewind(Source * source);
		void softRewind(Source * source);
		void seek(Source * source, float offset, void * unit);
		float tell(Source * source, void * unit);

	private:

		/**
		* Makes the specified OpenAL source available for use.
		* @param source The OpenAL source.
		**/
		void release(Source * source);

		ALuint findi(const Source * source) const;

		bool findSource(Source * source, ALuint & out);
		bool removeSource(Source * source);
	}; // Pool

} // openal
} // audio
} // love

#endif // LOVE_AUDIO_OPENAL_POOL_H