openalbridge/wrappers.c
author koda
Mon, 29 Jun 2009 23:03:25 +0000
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-openalbridge headers cleaned -static building of lib for non MSVC compilers
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/*
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 * OpenAL Bridge - a simple portable library for OpenAL interface
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 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#include "wrappers.h"
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#ifdef __CPLUSPLUS
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extern "C" {
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#endif 
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	extern ALint *Sources;
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	void *Malloc (size_t nbytes){
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		void *aptr;
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		if ((aptr = malloc(nbytes)) == NULL) {
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			fprintf(stderr, "ERROR: not enough memory! malloc() failed\n");
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			exit(-1);
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		}
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		return aptr;
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	}
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	FILE *Fopen (const char *fname, char *mode)	{
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		FILE *fp;
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		if ((fp=fopen(fname,mode)) == NULL)
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			fprintf (stderr, "ERROR: can't open file %s in mode '%s'\n", fname, mode);
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		return fp;
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	}
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	ALint AlGetError (const char *str) {
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		ALenum error;
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		error = alGetError();
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		if (error != AL_NO_ERROR) {
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			fprintf(stderr, str, error);
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			return -2;
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		} else 
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			return AL_TRUE;
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	}
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#ifndef _WIN32
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	void *helper_fadein(void *tmp) 
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#else
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	void WINAPI helper_fadein(void *tmp) 
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#endif
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	{
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		ALfloat gain;
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		ALfloat target_gain;
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		fade_t *fade;
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		int index; 
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		unsigned int quantity; 
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		fade = tmp;
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		index = fade->index;
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		quantity = fade->quantity;
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		free (fade);
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#ifdef DEBUG
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		fprintf(stderr, "Fade-out: index %d quantity %d\n", index, quantity);
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#endif
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		/*save the volume desired after the fade*/
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		alGetSourcef(Sources[index], AL_GAIN, &target_gain);
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		if (target_gain > 1.0f || target_gain <= 0.0f)
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			target_gain = 1.0f;
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		alSourcePlay(Sources[index]);
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		for (gain = 0.0f ; gain <= target_gain; gain += (float) quantity/10000) {
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#ifdef DEBUG
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			fprintf(stderr, "Fade-in: Set gain to: %f\n", gain);
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#endif
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			alSourcef(Sources[index], AL_GAIN, gain);
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			usleep(10000);
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		}
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		AlGetError("ERROR %d: Setting fade in volume\n");
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#ifndef _WIN32
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		pthread_exit(NULL);
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#else
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		_endthread();
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#endif
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	}
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#ifndef _WIN32
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	void *helper_fadeout(void *tmp) 
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#else
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	void WINAPI helper_fadeout(void *tmp) 	
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#endif
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	{
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		ALfloat gain;
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		ALfloat old_gain;
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		fade_t *fade;
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		int index; 
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		unsigned int quantity; 
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		fade = tmp;
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		index = fade->index;
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		quantity = fade->quantity;
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		free(fade);
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#ifdef DEBUG
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		fprintf(stderr, "Fade-out: index %d quantity %d\n", index, quantity);
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#endif
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		alGetSourcef(Sources[index], AL_GAIN, &old_gain);
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		for (gain = old_gain; gain >= 0.00f; gain -= (float) quantity/10000) {
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#ifdef DEBUG
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			fprintf(stderr, "Fade-out: Set gain to %f\n", gain);
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#endif
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			alSourcef(Sources[index], AL_GAIN, gain);
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			usleep(10000);
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		}
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		AlGetError("ERROR %d: Setting fade out volume\n");
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		/*stop that sound and reset its volume*/
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		alSourceStop (Sources[index]);
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		alSourcef (Sources[index], AL_GAIN, old_gain);	
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#ifndef _WIN32
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		pthread_exit(NULL);
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#else
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		_endthread();
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#endif
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	}
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#ifdef __CPLUSPLUS
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}
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#endif