/*

 * 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 "openalbridge.h"

#include "globals.h"

#include "wrappers.h"

#include "alc.h"

#include "loaders.h"

#ifdef __CPLUSPLUS

extern "C" {

#endif 

    /*Sources are points emitting sound*/

    ALuint *Sources;

    /*Buffers hold sound data*/

    ALuint *Buffers;

    /*index for Sources and Buffers*/

    ALuint globalindex, globalsize, increment;

    ALboolean openalReady = AL_FALSE;

    ALfloat old_gain;

    ALboolean openal_init(ALboolean usehardware, int memorysize) {	

        /*Initialize an OpenAL contex and allocate memory space for data and buffers*/

        ALCcontext *context;

        ALCdevice *device;

        prog = "OpenAL subsystem";

	// set the memory dimentsion and the increment width when reallocating

        if (memorysize <= 0)

            globalsize = 50;

        else

            globalsize = memorysize;

        increment = globalsize;

	// reuse old context but keep the new value for increment

        if (openalReady == AL_TRUE) {

            err_msg("(%s) WARN - already initialized", prog);

            return AL_FALSE;

        }

        if (usehardware == AL_TRUE)

            device = alcOpenDevice(NULL);

        else

            device = alcOpenDevice("Generic Software");

        err_msg("(%s) INFO - Output device: %s", prog, alcGetString(device, ALC_DEVICE_SPECIFIER));

	if (device == NULL) {

            errno = ENODEV;                

            err_ret("(%s) WARN - failed to open sound device", prog);

            return AL_FALSE;

        }

        context = alcCreateContext(device, NULL);

        alcMakeContextCurrent(context);

        alcProcessContext(context);

        if (AlGetError("(%s) WARN - Failed to create a new contex") != AL_TRUE)

            return AL_FALSE;

        // allocate memory space for buffers and sources

        Buffers = (ALuint*) Malloc(sizeof(ALuint)*globalsize);

        Sources = (ALuint*) Malloc(sizeof(ALuint)*globalsize);

        // set the listener gain, position (on xyz axes), velocity (one value for each axe) and orientation

	// Position, Velocity and Orientation of the listener

        ALfloat ListenerPos[] = {0.0, 0.0, 0.0};

        ALfloat ListenerVel[] = {0.0, 0.0, 0.0};

        ALfloat ListenerOri[] = {0.0, 0.0, -1.0,  0.0, 1.0, 0.0};

        alListenerf (AL_GAIN,        1.0f       );

        alListenerfv(AL_POSITION,    ListenerPos);

        alListenerfv(AL_VELOCITY,    ListenerVel);

        alListenerfv(AL_ORIENTATION, ListenerOri);

        if (AlGetError("(%s) WARN - Failed to set Listener properties") != AL_TRUE)

            return AL_FALSE;

        openalReady = AL_TRUE;

        alGetError();  // clear any AL errors beforehand

        return AL_TRUE;

    }

    void openal_close (void) {

        /*Stop all sounds, deallocate all memory and close OpenAL */

        ALCcontext *context;

        ALCdevice  *device;

        if (openalReady == AL_FALSE) {

            errno = EPERM;

            err_ret("(%s) WARN - OpenAL not initialized", prog);

            return;

        }

        alSourceStopv	(globalsize, Sources);

        alDeleteSources (globalsize, Sources);

        alDeleteBuffers (globalsize, Buffers);

        free(Sources);

        free(Buffers);

        context = alcGetCurrentContext();

        device  = alcGetContextsDevice(context);

        alcMakeContextCurrent(NULL);

        alcDestroyContext(context);

        alcCloseDevice(device);

        openalReady = AL_FALSE;

        err_msg("(%s) INFO - closed", prog);

    }

    ALboolean openal_ready(void) {

        return openalReady;

    }

    void helper_realloc (void) {

        /*expands allocated memory when loading more sound files than expected*/

        int oldsize = globalsize;

        globalsize += increment;

        err_msg("(%s) INFO - Realloc in process from %d to %d\n", prog, oldsize, globalsize);

        Buffers = (ALuint*) Realloc(Buffers, sizeof(ALuint)*globalsize);

        Sources = (ALuint*) Realloc(Sources, sizeof(ALuint)*globalsize);

        return;

    }

    int openal_loadfile (const char *filename){

        /*Open a file, load into memory and allocate the Source buffer for playing*/

        ALfloat SourcePos[] = { 0.0, 0.0, 0.0 }; /*Position of the source sound*/

        ALfloat SourceVel[] = { 0.0, 0.0, 0.0 }; /*Velocity of the source sound*/

        ALenum format;

        ALsizei bitsize, freq;

        char *data;

        uint32_t fileformat;

        ALenum error;

        FILE *fp;

        if (openalReady == AL_FALSE) {

            err_msg("(%s) WARN - not initialized", prog);

            return -1;

        }

        /*when the buffers are all used, we can expand memory to accept new files*/

        if (globalindex == globalsize)

            helper_realloc();

        /*detect the file format, as written in the first 4 bytes of the header*/

        fp = Fopen (filename, "rb");

        if (fp == NULL)

            return -2;

        error = fread (&fileformat, sizeof(uint32_t), 1, fp);

        fclose (fp);

        if (error < 0) {

            err_msg("(%s) ERROR - File %s is too short", prog, filename);

            return -3;

        }

        /*prepare the buffer to receive data*/

        alGenBuffers(1, &Buffers[globalindex]);

        if (AlGetError("(%s) ERROR - Failed to allocate memory for buffers") != AL_TRUE)

            return -4;

        /*prepare the source to emit sound*/

        alGenSources(1, &Sources[globalindex]);

        if (AlGetError("(%s) ERROR - Failed to allocate memory for sources") != AL_TRUE)

            return -5;

        switch (ENDIAN_BIG_32(fileformat)) {

            case OGG_FILE_FORMAT:

                error = load_oggvorbis (filename, &format, &data, &bitsize, &freq);

                break;

            case WAV_FILE_FORMAT:

                error = load_wavpcm (filename, &format, &data, &bitsize, &freq);

                break;

            default:

                err_msg ("(%s) ERROR - File format (%08X) not supported", prog, ENDIAN_BIG_32(fileformat));

                return -6;

                break;

        }

        /*copy pcm data in one buffer*/

        alBufferData(Buffers[globalindex], format, data, bitsize, freq);

        free(data);		/*deallocate data to save memory*/

        if (AlGetError("(%s) ERROR - Failed to write data to buffers") != AL_TRUE)

            return -6;

        /*set source properties that it will use when it's in playback*/

        alSourcei (Sources[globalindex], AL_BUFFER,   Buffers[globalindex]  );

        alSourcef (Sources[globalindex], AL_PITCH,    1.0f                  );

        alSourcef (Sources[globalindex], AL_GAIN,     1.0f                  );

        alSourcefv(Sources[globalindex], AL_POSITION, SourcePos             );

        alSourcefv(Sources[globalindex], AL_VELOCITY, SourceVel             );

        alSourcei (Sources[globalindex], AL_LOOPING,  0                     );

        if (AlGetError("(%s) ERROR - Failed to set Source properties") != AL_TRUE)

            return -7;

        alGetError();  /* clear any AL errors beforehand */

        /*returns the index of the source you just loaded, increments it and exits*/

        return globalindex++;

    }

    void openal_playsound (uint32_t index) {

        openal_playsound_loop (index, 0);

    }

    void openal_pausesound (uint32_t index) {

        if (openalReady == AL_TRUE && index < globalsize)

            alSourcePause(Sources[index]);

    }

    void openal_stopsound (uint32_t index) {

        openal_stopsound_free(index, 0);

    }

    void openal_freesound (uint32_t index){

       if (openalReady == AL_TRUE && index < globalsize)

            alSourceStop(Sources[index]);

           // STUB

    }

    void openal_playsound_loop (unsigned int index, char loops) {

	if (openalReady == AL_TRUE && index < globalsize) {

            alSourcePlay(Sources[index]);

	    if (loops != 0)

                openal_toggleloop(index);

	}

    }

    void openal_stopsound_free    (unsigned int index, char freesource) {

        if (openalReady == AL_TRUE && index < globalsize) {

            alSourceStop(Sources[index]);

	    if (freesource != 0)

	        openal_freesound(index);

	}

    }

    void openal_toggleloop (uint32_t index) {

        ALint loop;

        if (openalReady == AL_TRUE && index < globalsize) {

            alGetSourcei (Sources[index], AL_LOOPING, &loop);

            alSourcei (Sources[index], AL_LOOPING, !((uint8_t) loop) & 0x00000001);

	}

    }

    void openal_setvolume (uint32_t index, float gain) {

        if (openalReady == AL_TRUE && index < globalsize)

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

    }

    void openal_setglobalvolume (float gain) {

        if (openalReady == AL_TRUE)

            alListenerf (AL_GAIN, gain);

    }

    void openal_togglemute () {

        ALfloat gain;

        if (openalReady == AL_TRUE) {

            alGetListenerf (AL_GAIN, &gain);

            if (gain > 0) {

		old_gain = gain; 

                gain = 0;

	    } else 

                gain = old_gain;

	    alListenerf (AL_GAIN, gain);

	}

    }

    void openal_fade (uint32_t index, uint16_t quantity, char direction) {

        /*Fade in or out by calling a helper thread*/

#ifndef _WIN32

        pthread_t thread;

#else

        HANDLE Thread;

        DWORD threadID;

#endif

        fade_t *fade;

        if (openalReady == AL_TRUE && index < globalsize) {

            fade = (fade_t*) Malloc(sizeof(fade_t));

            fade->index = index;

            fade->quantity = quantity;

            if (direction > 0) {

#ifndef _WIN32

                pthread_create(&thread, NULL, helper_fadein, (void*) fade);

#else

                Thread = _beginthread(&helper_fadein, 0, (void*) fade);

#endif

            } else {

#ifndef _WIN32

                pthread_create(&thread, NULL, helper_fadeout, (void*) fade);

#else

                Thread = _beginthread(&helper_fadeout, 0, (void*) fade);

#endif	

            }

#ifndef _WIN32

            pthread_detach(thread);

#endif

	}

    }

    void openal_fadeout (uint32_t index, uint16_t quantity) {

        openal_fade(index, quantity, AL_FADE_OUT);

    }

    void openal_fadein (uint32_t index, uint16_t quantity) {

        openal_fade(index, quantity, AL_FADE_IN);

    }

    void openal_setposition (uint32_t index, float x, float y, float z) {

        if (openalReady == AL_TRUE && index < globalsize) 

            alSource3f(Sources[index], AL_POSITION, x, y, z);;

    }

#ifdef __CPLUSPLUS

}

#endif