/*

 * 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"

#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;

        ALboolean 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 AL_FALSE;

                }

                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;

                return AL_TRUE;

        }

        ALboolean openal_ready(void) {

                return openalReady;

        }

        ALboolean openal_init(char* programname, ALboolean usehardware, uint32_t memorysize) {	

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

                ALCcontext *context;

                ALCdevice *device;

                const ALCchar *default_device;

                prog = programname;

                /*Position of the listener*/

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

                /*Velocity of the listener*/

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

                /*Orientation of the listener. (first 3 elements are "at", second 3 are "up")*/

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

                if (openalReady == AL_TRUE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                if (usehardware == AL_TRUE)

                        device = alcOpenDevice(NULL);

                else

                        device = alcOpenDevice("Generic Software");

                if (device == NULL) {

                        errno = ENODEV;                

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

                        return AL_FALSE;

                }

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

                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*/

                if (memorysize == 0)

                        globalsize = 50;

                else

                        globalsize = memorysize;

                increment  = globalsize;

                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*/

                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;

        }

        ALboolean helper_realloc (void) {

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

                int oldsize = globalsize;

                globalsize += increment;

#ifdef DEBUG

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

#endif

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

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

                return AL_TRUE;

        }

        ALint 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) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                /*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 -1;

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

                fclose (fp);

                if (error < 0) {

                        errno = EIO;

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

                        return -2;

                }

                /*prepare the buffer to receive data*/

                alGenBuffers(1, &Buffers[globalindex]);

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

                        return -3;

                /*prepare the source to emit sound*/

                alGenSources(1, &Sources[globalindex]);

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

                        return -4;

                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:

                                errno = EINVAL;

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

                                return -5;

                                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++;

        }

        ALboolean openal_toggleloop (uint32_t index){

                /*Set or unset looping mode*/

                ALint loop;

                if (openalReady == AL_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                if (index >= globalsize) {

                        errno = EINVAL;

                        err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);

                        return AL_FALSE;

                }

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

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

                if (AlGetError("(%s) ERROR - Failed to get or set loop property") != AL_TRUE)

                        return AL_FALSE;

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

                return AL_TRUE;

        }

        ALboolean openal_setvolume (uint32_t index, uint8_t percentage) {

                if (openalReady == AL_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                /*Set volume for sound number index*/

                if (index >= globalsize) {

                        errno = EINVAL;

                        err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);

                        return AL_FALSE;

                }

                if (percentage > 100)

                        percentage = 100;

                alSourcef (Sources[index], AL_GAIN, (float) percentage/100.0f);

                if (AlGetError2("(%s) ERROR -  Failed to set volume for sound %d\n", index) != AL_TRUE)

                        return AL_FALSE;

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

                return AL_TRUE;

        }

        ALboolean openal_setglobalvolume (uint8_t percentage) {

                if (openalReady == AL_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                /*Set volume for all sounds*/		

                if (percentage > 100)

                        percentage = 100;

                alListenerf (AL_GAIN, (float) percentage/100.0f);

                if (AlGetError("(%s) ERROR -  Failed to set global volume") != AL_TRUE)

                        return AL_FALSE;

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

                return AL_TRUE;

        }

        ALboolean openal_togglemute () {

                /*Mute or unmute sound*/

                ALfloat mute;

                if (openalReady == AL_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                alGetListenerf (AL_GAIN, &mute);

                if (mute > 0) 

                        mute = 0;

                else

                        mute = 1.0;

                alListenerf (AL_GAIN, mute);

                if (AlGetError("(%s) ERROR -  Failed to set mute property") != AL_TRUE)

                        return AL_FALSE;

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

                return AL_TRUE;

        }

        ALboolean openal_fade (uint32_t index, uint16_t quantity, ALboolean 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_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

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

                fade->index = index;

                fade->quantity = quantity;

                if (index >= globalsize) {

                        errno = EINVAL;

                        err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);

                        return AL_FALSE;

                }

                switch (direction) {

                        case FADE_IN:

#ifndef _WIN32

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

#else

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

#endif

                                break;

                        case FADE_OUT:

#ifndef _WIN32

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

#else

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

#endif	

                                break;

                        default:

                                errno = EINVAL;

                                err_ret("(%s) ERROR - Unknown direction for fading", prog, index, globalindex);

                                free(fade);

                                return AL_FALSE;

                                break;

                }

#ifndef _WIN32

                pthread_detach(thread);

#endif

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

                return AL_TRUE;

        }

        ALboolean openal_fadeout (uint32_t index, uint16_t quantity) {

                /*wrapper for fadeout*/

                return openal_fade(index, quantity, FADE_OUT);

        }

        ALboolean openal_fadein (uint32_t index, uint16_t quantity) {

                /*wrapper for fadein*/

                return openal_fade(index, quantity, FADE_IN);

        }

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

                if (openalReady == AL_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                if (index >= globalsize) {

                        errno = EINVAL;

                        err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);

                        return AL_FALSE;

                }

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

                if (AlGetError2("(%s) ERROR - Failed to set position for sound %d)", index) != AL_TRUE)

                        return AL_FALSE;

                return AL_TRUE;

        }

        ALboolean openal_playsound (uint32_t index){

                if (openalReady == AL_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                /*Play sound number index*/

                if (index >= globalsize) {

                        errno = EINVAL;

                        err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);

                        return AL_FALSE;

                }

                alSourcePlay(Sources[index]);

                if (AlGetError2("(%s) ERROR - Failed to play sound %d)", index) != AL_TRUE)

                        return AL_FALSE;

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

                return AL_TRUE;

        }

        ALboolean openal_pausesound(uint32_t index){

                if (openalReady == AL_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                /*Pause sound number index*/

                if (index >= globalsize) {

                        errno = EINVAL;

                        err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);

                        return AL_FALSE;

                }

                alSourcePause(Sources[index]);

                if (AlGetError2("(%s) ERROR - Failed to pause sound %d)", index) != AL_TRUE)

                        return AL_FALSE;

                return AL_TRUE;

        }

        ALboolean openal_stopsound(uint32_t index){

                if (openalReady == AL_FALSE) {

                        errno = EPERM;                

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

                        return AL_FALSE;

                }

                /*Stop sound number index*/

                if (index >= globalsize) {

                        errno = EINVAL;

                        err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);

                        return AL_FALSE;

                }

                alSourceStop(Sources[index]);

                if (AlGetError2("(%s) ERROR - Failed to stop sound %d)", index) != AL_TRUE)

                        return AL_FALSE;

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

                return AL_TRUE;