/*
 * 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
		
		//save the volume desired after the fade
		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");
		
		//stop that sound and reset its volume
		alSourceStop (Sources[index]);
		alSourcef (Sources[index], AL_GAIN, old_gain);	
		
#ifndef _WIN32
		pthread_exit(NULL);
#else
		_endthread();
#endif
	}
	
#ifdef __CPLUSPLUS
}
#endif