/*
   audio/sources.cc
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#include <string.h>

#include "audio/sources.h"
#include "sys/sys.h"

namespace audio
{

ALuint Sources::sources[MAXSOURCES];
bool Sources::source_available[MAXSOURCES];

void Sources::init()
{
	int error;
	clear();
	
	alGenSources(MAXSOURCES, sources);

	if ((error = alGetError()) != AL_NO_ERROR) {
		con_warn << "Error " << error << " initializing OpenAL sources!" << std::endl;
		return;
	}

	// all sources are available for use
	for (size_t i = MAXUISOURCES; i < MAXSOURCES; i++) {
		source_available[i] = true;
	}

	// reserve ui sound sources
	for (size_t i=0; i < MAXUISOURCES; i++) {
		source_available[i] = false;
	}
}

void Sources::shutdown()
{
	// stop all sources
	for (size_t index= 0; index < MAXSOURCES; index++) {
		alSourceRewind(sources[index]);
	}

	alDeleteSources(MAXSOURCES, sources);
	clear();
}

void Sources::clear()
{
	memset(sources,0, sizeof(sources));

	// all sources are available for use
	for (size_t i=0; i < MAXSOURCES; i++) {
		source_available[i] = false;
	}
}

size_t Sources::get()
{
	for (size_t i= MAXUISOURCES; i < MAXSOURCES; i++) {
		if (source_available[i]) {
			source_available[i] = false;
 			alSourcef(sources[i], AL_PITCH, 1.0);
    			alSourcef(sources[i], AL_GAIN, 0.0);
			//con_debug << "reserved source " << i << std::endl;
			return i;
		}
	}
	return 0;
}

void Sources::remove(size_t index)
{
	if ( (index < MAXUISOURCES ) || (MAXSOURCES <= index))
		return;

	source_available[index] = true;
	alSourcef(sources[index], AL_GAIN, 0);
	alSourceRewind(sources[index]);

	//con_debug << "removed source " << index << std::endl;
}

}