/*

 * 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 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 General Public License for more details.

 *

 * You should have received a copy of the GNU 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 "globals.h"

#include "wrappers.h"

#include "alc.h"

#include "loaders.h"

#include "endianness.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;

	/*Position of the source sound*/

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

	/*Velocity of the source sound*/

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

	ALint openal_close(void) {

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

		ALCcontext *context;

		ALCdevice  *device;

		alSourceStopv	(globalsize, Sources);

		alDeleteSources (globalsize, Sources);

		alDeleteBuffers (globalsize, Buffers);

		free(Sources);

		free(Buffers);

		context = alcGetCurrentContext();

		device  = alcGetContextsDevice(context);

		alcMakeContextCurrent(NULL);

		alcDestroyContext(context);

		alcCloseDevice(device);

		return AL_TRUE;

	}

	ALint openal_init(uint32_t memorysize) {	

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

		ALCcontext *context;

		ALCdevice *device;

		const ALCchar *default_device;

		/*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 };

		default_device = alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER);

		fprintf(stderr, "Using default device: %s\n", default_device);

		if ((device = alcOpenDevice(default_device)) == NULL) {

			fprintf(stderr, "ERROR: Failed to open sound device\n");

			return AL_FALSE;

		}

		context = alcCreateContext(device, NULL);

		alcMakeContextCurrent(context);

		alcProcessContext(context);

		if (AlGetError("ERROR %d: Creating a new contex\n") != AL_TRUE)

			return AL_FALSE;

		/*allocate memory space for buffers and sources*/

		globalsize = memorysize;

		increment = memorysize;

		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("ERROR %d: Setting Listener properties\n") != AL_TRUE)

			return AL_FALSE;

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

		return AL_TRUE;

	}

	uint8_t helper_realloc (void) {

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

		globalsize += increment;

#ifdef DEBUG

		fprintf(stderr, "OpenAL: Realloc in process %d\n", globalsize);

#endif

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

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

		return 0;

	}

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

		ALenum format;

		ALsizei bitsize;

		ALsizei freq;

		char *data;

		uint32_t fileformat;

		ALenum error;

		FILE *fp;

		/*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) {

			fprintf(stderr, "ERROR: file %s is too short \n", filename);

			return -2;

		}

		/*prepare the buffer to receive data*/

		alGenBuffers(1, &Buffers[globalindex]);

		if (AlGetError("ERROR %d: Allocating memory for buffers\n") != AL_TRUE)

			return -3;

		/*prepare the source to emit sound*/

		alGenSources(1, &Sources[globalindex]);

		if (AlGetError("ERROR %d: Allocating memory for sources\n") != AL_TRUE)

			return -4;

		if (fileformat == 0x5367674F) /*check if ogg*/

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

		else {

			if (fileformat == 0x46464952) /*check if wav*/

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

			else {

				fprintf(stderr, "ERROR: File format (%08X) not supported!\n", invert_endianness(fileformat));

				return -5;

			}

		}

		/*copy pcm data in one buffer*/

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

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

		if (AlGetError("ERROR %d: Writing data to buffer\n") != 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("ERROR %d: Setting source properties\n") != 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++;

	}

	ALint openal_toggleloop (uint32_t index){

		/*Set or unset looping mode*/

		ALint loop;

		if (index >= globalsize) {

			fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);

			return AL_FALSE;

		}

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

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

		if (AlGetError("ERROR %d: Getting or setting loop property\n") != AL_TRUE)

			return AL_FALSE;

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

		return AL_TRUE;

	}

	ALint openal_setvolume (uint32_t index, uint8_t percentage) {

		/*Set volume for sound number index*/

		if (index >= globalindex) {

			fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);

			return AL_FALSE;

		}

		if (percentage > 100)

			percentage = 100;

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

		if (AlGetError("ERROR %d: Setting volume for last sound\n") != AL_TRUE)

			return AL_FALSE;

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

		return AL_TRUE;

	}

	ALint openal_setglobalvolume (uint8_t percentage) {

		/*Set volume for all sounds*/		

		if (percentage > 100)

			percentage = 100;

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

		if (AlGetError("ERROR %d: Setting global volume\n") != AL_TRUE)

			return AL_FALSE;

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

		return AL_TRUE;

	}

	ALint openal_togglemute () {

		/*Mute or unmute sound*/

		ALfloat mute;

		alGetListenerf (AL_GAIN, &mute);

		if (mute > 0) 

			mute = 0;

		else

			mute = 1.0;

		alListenerf (AL_GAIN, mute);

		if (AlGetError("ERROR %d: Setting mute property\n") != AL_TRUE)

			return AL_FALSE;

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

		return AL_TRUE;

	}

	ALint openal_fade(uint32_t index, uint16_t quantity, uint8_t direction) {

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

#ifndef _WIN32

		pthread_t thread;

#else

		HANDLE Thread;

		DWORD threadID;

#endif

		fade_t *fade;

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

		fade->index = index;

		fade->quantity = quantity;

		if (index >= globalindex) {

			fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);

			return AL_FALSE;

		}

		if (direction == FADE_IN)

#ifndef _WIN32

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

#else

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

#endif

		else {

			if (direction == FADE_OUT)

#ifndef _WIN32

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

#else

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

#endif	

			else {

				fprintf(stderr, "ERROR: unknown direction for fade (%d)\n", direction);

				free(fade);

				return AL_FALSE;

			}

		}

#ifndef _WIN32

		pthread_detach(thread);

#endif

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

		return AL_TRUE;

	}

	ALint openal_fadeout(uint32_t index, uint16_t quantity) {

		/*wrapper for fadeout*/

		return openal_fade(index, quantity, FADE_OUT);

	}

	ALint openal_fadein(uint32_t index, uint16_t quantity) {

		/*wrapper for fadein*/

		return openal_fade(index, quantity, FADE_IN);

	}

	ALint openal_playsound(uint32_t index){

		/*Play sound number index*/

		if (index >= globalindex) {

			fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);

			return AL_FALSE;

		}

		alSourcePlay(Sources[index]);

		if (AlGetError("ERROR %d: Playing last sound\n") != AL_TRUE)

			return AL_FALSE;

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

		return AL_TRUE;

	}

	ALint openal_pausesound(uint32_t index){

		/*Pause sound number index*/

		if (index >= globalindex) {

			fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);

			return AL_FALSE;

		}

		alSourcePause(Sources[index]);

		if (AlGetError("ERROR %d: Pausing last sound\n") != AL_TRUE)

			return AL_FALSE;

		return AL_TRUE;

	}

	ALint openal_stopsound(uint32_t index){

		/*Stop sound number index*/

		if (index >= globalindex) {

			fprintf(stderr, "ERROR: index out of bounds (got %d, max %d)\n", index, globalindex);

			return AL_FALSE;

		}

		alSourceStop(Sources[index]);

		if (AlGetError("ERROR %d: Stopping last sound\n") != AL_TRUE)

			return AL_FALSE;

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

		return AL_TRUE;

	}

#ifdef __CPLUSPLUS

}

#endif