/*

 * OpenAL Bridge - a simple portable library for OpenAL interface

 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>,

 *                    Mario Liebisch <mario.liebisch+hw@googlemail.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"

char *prog;

/*Buffers hold sound data*/

ALuint *Buffers;

/*index for Sources and Buffers*/

ALuint globalindex, globalsize, increment;

//null vector

const ALfloat NV[] = {0.0f, 0.0f, 0.0f};

//listener orientation

const ALfloat LO[] = {0.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f};

SSound_t aSounds[MAX_SOUNDS];

int iNumSounds = 0;

char oalbReady = 0;

ALCcontext *context;

ALCdevice *device;

ALuint sources[MAX_SOURCES];

/**

 * const char oalb_init (const char* programname, const char usehardware) 

 *

 *  ARGUMENTS

 * programname [const char*]: name of the program invoking OpenAL

 * usehardware [const char] : flag to enable audio hardware acceleration

 *  DESCRIPTION

 *

 *  RETURN

 * 1 success

 * 2 error

 */

const char oalb_init (const char* programname, const char usehardware) {                

        prog = (char *) programname;

        if (oalbReady == AL_TRUE) {

                errno = EPERM;                

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

                return AL_FALSE;

        }

#ifdef _WIN32

        /* Hardware acceleration is broken on some windows card*/

        if (usehardware != 0)

                device = alcOpenDevice(NULL);

        else

        {

                device = alcOpenDevice("Generic Software");

                if(!device)

                {

                        err_msg("(%s) WARN - Failed to open software device", prog);

                        device = alcOpenDevice(NULL);

                }

        }

#else

        /*always hardware for UNIX systems*/

        device = alcOpenDevice(NULL);

#endif

        if (device == NULL) {

                errno = ENODEV;                

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

                return AL_FALSE;

        }

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

        context = alcCreateContext(device, NULL);

        alcMakeContextCurrent(context);

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

                return AL_FALSE;

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

        alListenerf (AL_GAIN,        1.0f);

        alListenerfv(AL_POSITION,    NV);

        alListenerfv(AL_VELOCITY,    NV);

        alListenerfv(AL_ORIENTATION, LO);

        alcProcessContext(context);

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

                return AL_FALSE;

        alGenSources(MAX_SOURCES, sources);

        oalbReady = AL_TRUE;

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

        return AL_TRUE;

}

/**

 * void oalb_close (void) 

 *

 *  ARGUMENTS

 * -

 *  DESCRIPTION

 * Stop all sounds, deallocate all memory and close OpenAL

 *  RETURN

 * -

 */

void oalb_close (void) {

        int i;

        if (oalbReady == 0) {

                errno = EPERM;

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

                return;

        }

        for(i = 0; i < iNumSounds; i++) {

                SSound_stop(&aSounds[i]);

                SSound_close(&aSounds[i]);

        }

        alSourceStopv (MAX_SOURCES, sources);

        alDeleteSources (MAX_SOURCES, sources);

        alcMakeContextCurrent(NULL);

        alcDestroyContext(context);

        alcCloseDevice(device);

        oalbReady = 0;

        return;

}

/**

 * char oalb_ready (void)  

 *

 *  ARGUMENTS

 * -

 *  DESCRIPTION

 *

 *  RETURN

 * -

 */

char oalb_ready (void) {

        return oalbReady;

}

/**

 * const int32_t oalb_loadfile (const char *filename) 

 *

 *  ARGUMENTS

 * -

 *  DESCRIPTION

 *

 *  RETURN

 * -

 */

const int32_t oalb_loadfile (const char *filename) {

        int i;

        if (oalbReady == 0) {

                errno = EPERM;                

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

                return -1;

        }

        if(iNumSounds == MAX_SOUNDS) {

                err_msg("(%s) WARN - Maximum number of sound samples reached", prog);

                return -3;

        }

        for(i = 0; i < iNumSounds; i++)

                if(strcmp(aSounds[i].Filename, filename) == 0)

                        return i;

        if(SSound_load(&aSounds[iNumSounds], filename))

                return iNumSounds++;

        else

                return -2;

}

void oalb_setvolume (const uint32_t iIndex,  const char cPercentage) {

        if (oalbReady == 0) {

                errno = EPERM;                

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

                return;

        }

        /*Set volume for sound number index*/

        if(iIndex < 0 || iIndex >= iNumSounds) {

                errno = EINVAL;

                return;

        }

        if(cPercentage > 100)

                SSound_volume(&aSounds[iIndex], 1.0f);

        else

                SSound_volume(&aSounds[iIndex], cPercentage / 100.0f);

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

                return;

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

        return;

}

void oalb_setglobalvolume (const char cPercentage) {

        if (oalbReady == 0) {

                errno = EPERM;                

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

                return;

        }

        /*Set volume for all sounds*/		

        if(cPercentage > 100)

                alListenerf (AL_GAIN, 1.0f);

        else

                alListenerf (AL_GAIN, cPercentage / 100.0f);

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

                return;

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

        return;

}

void oalb_togglemute (void) {

        /*Mute or unmute sound*/

        ALfloat mute;

        if (oalbReady == AL_FALSE) {

                errno = EPERM;                

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

                return;

        }

        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;

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

        return;

}

 /*

 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 (oalbReady == 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 (oalbReady == 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;

 }

 */

void oalb_playsound (const uint32_t iIndex, const char bLoop) {

        if (oalbReady == AL_FALSE) {

                errno = EPERM;                

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

                return;

        }

        /*Play sound number index*/

        if(iIndex < 0 || iIndex >= iNumSounds) {

                errno = EINVAL;

                err_ret("(%s) ERROR - Index (%d) out of bounds", prog, iIndex);

                return;

        }

        SSound_play(&aSounds[iIndex], bLoop);

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

        return;

}

void oalb_pausesound (const uint32_t iIndex) {

        if (oalbReady == AL_FALSE) {

                errno = EPERM;                

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

                return;

        }

        /*Pause sound number index*/

        if(iIndex < 0 || iIndex >= iNumSounds) {

                errno = EINVAL;

                err_ret("(%s) ERROR - Index (%d) out of bounds", prog, iIndex);

                return;

        }

        SSound_pause(&aSounds[iIndex]);

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

                return;

        return;

}

void oalb_stopsound (const uint32_t iIndex) {

        if (oalbReady == AL_FALSE) {

                errno = EPERM;                

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

                return;

        }

        /*Stop sound number index*/

        if(iIndex < 0 || iIndex >= iNumSounds) {

                errno = EINVAL;

                err_ret("(%s) ERROR - Index (%d) out of bounds", prog, iIndex);

                return;

        }

        SSound_stop(&aSounds[iIndex]);

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

                return;

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

        return;

}