/*
* 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 Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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"
#include "openalbridge_t.h"

extern ALint *Sources;

void *Malloc (size_t nbytes) {
    void *aptr;

    if ((aptr = malloc(nbytes)) == NULL) {
        fprintf(stderr,"(Bridge Fatal Error) - not enough memory");
        abort();
    }
    
    return aptr;
}


void *Realloc (void *aptr, size_t nbytes) {
    aptr = realloc(aptr, nbytes);

    if (aptr == NULL) {
        fprintf(stderr,"(Bridge Fatal Error) - not enough memory");
        abort();
    }

    return aptr;
}


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

    fp = fopen(fname,mode);
    if (fp == NULL)
        fprintf(stderr,"(Bridge Error) - can't open file %s in mode '%s'", fname, mode);

    return fp;
}


void helper_fade(void *tmp) {
    ALfloat gain;
    ALfloat target_gain;
    fade_t *fade;
    uint32_t index;
    uint16_t quantity;
    al_fade_t type;

    fade = tmp;
    index = fade->index;
    quantity = fade->quantity;
    type = fade->type;
    free (fade);

    if (type == AL_FADE_IN) {
#ifdef DEBUG
        fprintf(stderr,"(Bridge Info) - Fade-in in progress [index %d quantity %d]", 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 TRACE
            err_msg("(%s) DEBUG - Fade-in set gain to %f", gain);
#endif
            alSourcef(Sources[index], AL_GAIN, gain);
            usleep(10000);
        }
    } else {
        alGetSourcef(Sources[index], AL_GAIN, &target_gain);

        for (gain = target_gain; gain >= 0.00f; gain -= (float) quantity/10000) {
#ifdef TRACE
            err_msg("(%s) DEBUG - Fade-out set gain to %f", gain);
#endif
            alSourcef(Sources[index], AL_GAIN, gain);
            usleep(10000);
        }

        if (AL_NO_ERROR != alGetError())
            fprintf(stderr,"(Bridge Warning) - Failed to set fade-out effect");

        // stop that sound and reset its volume
        alSourceStop (Sources[index]);
        alSourcef (Sources[index], AL_GAIN, target_gain);
    }

    if (AL_NO_ERROR != alGetError())
        fprintf(stderr,"(Bridge Warning) - Failed to set fade effect");

#ifndef _WIN32
    pthread_exit(NULL);
#else
    _endthread();
#endif
}