/*

 * OpenAL Bridge - a simple portable library for OpenAL interface

 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>

 *

 * This program 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; version 2 of the License

 *

 * This program 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 this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

#include "wrappers.h"

#ifdef __CPLUSPLUS

extern "C" {

#endif 

	extern ALint *Sources;

	void *Malloc (size_t nbytes){

		void *aptr;

		if ((aptr = malloc(nbytes)) == NULL) {

			fprintf(stderr, "ERROR: not enough memory! malloc() failed\n");

			exit(-1);

		}

		return aptr;

	}

	FILE *Fopen (const char *fname, char *mode)	{

		FILE *fp;

		if ((fp=fopen(fname,mode)) == NULL)

			fprintf (stderr, "ERROR: can't open file %s in mode '%s'\n", fname, mode);

		return fp;

	}

	ALint AlGetError (const char *str) {

		ALenum error;

		error = alGetError();

		if (error != AL_NO_ERROR) {

			fprintf(stderr, str, error);

			return -2;

		} else 

			return AL_TRUE;

	}

#ifndef _WIN32

	void *helper_fadein(void *tmp) 

#else

	void WINAPI helper_fadein(void *tmp) 

#endif

	{

		ALfloat gain;

		ALfloat target_gain;

		fade_t *fade;

		int index; 

		unsigned int quantity; 

		fade = tmp;

		index = fade->index;

		quantity = fade->quantity;

		free (fade);

#ifdef DEBUG

		fprintf(stderr, "Fade-out: index %d quantity %d\n", index, quantity);

#endif

		alGetSourcef(Sources[index], AL_GAIN, &target_gain);

		if (target_gain > 1.0f || target_gain <= 0.0f)

			target_gain = 1.0f;

		alSourcePlay(Sources[index]);

		for (gain = 0.0f ; gain <= target_gain; gain += (float) quantity/10000) {

#ifdef DEBUG

			fprintf(stderr, "Fade-in: Set gain to: %f\n", gain);

#endif

			alSourcef(Sources[index], AL_GAIN, gain);

			usleep(10000);

		}

		AlGetError("ERROR %d: Setting fade in volume\n");

#ifndef _WIN32

		pthread_exit(NULL);

#else

		_endthread();

#endif

	}

#ifndef _WIN32

	void *helper_fadeout(void *tmp) 

#else

	void WINAPI helper_fadeout(void *tmp) 	

#endif

	{

		ALfloat gain;

		ALfloat old_gain;

		fade_t *fade;

		int index; 

		unsigned int quantity; 

		fade = tmp;

		index = fade->index;

		quantity = fade->quantity;

		free(fade);

#ifdef DEBUG

		fprintf(stderr, "Fade-out: index %d quantity %d\n", index, quantity);

#endif

		alGetSourcef(Sources[index], AL_GAIN, &old_gain);

		for (gain = old_gain; gain >= 0.00f; gain -= (float) quantity/10000) {

#ifdef DEBUG

			fprintf(stderr, "Fade-out: Set gain to %f\n", gain);

#endif

			alSourcef(Sources[index], AL_GAIN, gain);

			usleep(10000);

		}

		AlGetError("ERROR %d: Setting fade out volume\n");

		alSourceStop (Sources[index]);

		alSourcef (Sources[index], AL_GAIN, old_gain);	

#ifndef _WIN32

		pthread_exit(NULL);

#else

		_endthread();

#endif

	}

#ifdef __CPLUSPLUS

}

#endif