openalbridge/openalbridge.c
author nemo
Fri, 16 Oct 2009 15:56:42 +0000
changeset 2493 08313e4080e4
parent 2446 cbb3af76bcc0
child 2494 1e10a47cabea
permissions -rw-r--r--
updated map.png to remove teleport/spawn point between crab's legs
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/*
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 * OpenAL Bridge - a simple portable library for OpenAL interface
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 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>,
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 *                    Mario Liebisch <mario.liebisch+hw@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU Lesser General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#include "openalbridge.h"
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char *prog;
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/*Buffers hold sound data*/
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ALuint *Buffers;
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/*index for Sources and Buffers*/
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ALuint globalindex, globalsize, increment;
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//null vector
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const ALfloat NV[] = {0.0f, 0.0f, 0.0f};
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//listener orientation
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const ALfloat LO[] = {0.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f};
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SSound_t aSounds[MAX_SOUNDS];
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int iNumSounds = 0;
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char oalbReady = 0;
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ALCcontext *context;
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ALCdevice *device;
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ALuint sources[MAX_SOURCES];
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/**
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 * const char oalb_init (const char* programname, const char usehardware) 
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 *
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 *  ARGUMENTS
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 * programname [const char*]: name of the program invoking OpenAL
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 * usehardware [const char] : flag to enable audio hardware acceleration
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 *  DESCRIPTION
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 *
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 *  RETURN
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 * 1 success
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 * 2 error
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 */
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const char oalb_init (const char* programname, const char usehardware) {                
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        prog = (char *) programname;
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        if (oalbReady == AL_TRUE) {
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                errno = EPERM;                
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                err_ret("(%s) WARN - OpenAL already initialized", prog);
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                return AL_FALSE;
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        }
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#ifdef _WIN32
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        /* Hardware acceleration is broken on some windows card*/
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        if (usehardware != 0)
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                device = alcOpenDevice(NULL);
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        else
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        {
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                device = alcOpenDevice("Generic Software");
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                if(!device)
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                {
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                        err_msg("(%s) WARN - Failed to open software device", prog);
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                        device = alcOpenDevice(NULL);
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                }
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        }
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#else
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        /*always hardware for UNIX systems*/
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        device = alcOpenDevice(NULL);
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#endif
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        if (device == NULL) {
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                errno = ENODEV;                
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                err_ret("(%s) WARN - Failed to open sound device", prog);
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                return AL_FALSE;
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        }
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        err_msg("(%s) INFO - Using OpenAL device: %s", prog, alcGetString(device, ALC_DEVICE_SPECIFIER));
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        context = alcCreateContext(device, NULL);
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        alcMakeContextCurrent(context);
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        if (AlGetError("(%s) WARN - Failed to create a new contex") != AL_TRUE)
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                return AL_FALSE;
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        /*set the listener gain, position (on xyz axes), velocity (one value for each axe) and orientation*/
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        alListenerf (AL_GAIN,        1.0f);
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        alListenerfv(AL_POSITION,    NV);
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        alListenerfv(AL_VELOCITY,    NV);
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        alListenerfv(AL_ORIENTATION, LO);
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        alcProcessContext(context);
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        if (AlGetError("(%s) WARN - Failed to set Listener properties") != AL_TRUE)
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                return AL_FALSE;
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        alGenSources(MAX_SOURCES, sources);
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        oalbReady = AL_TRUE;
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        alGetError();  /* clear any AL errors beforehand */
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        return AL_TRUE;
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}
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/**
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 * void oalb_close (void) 
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 *
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 *  ARGUMENTS
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 * -
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 *  DESCRIPTION
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 * Stop all sounds, deallocate all memory and close OpenAL
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 *  RETURN
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 * -
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 */
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void oalb_close (void) {
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        int i;
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        if (oalbReady == 0) {
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                errno = EPERM;
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                err_ret("(%s) WARN - OpenAL not initialized", prog);
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                return;
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        }
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        for(i = 0; i < iNumSounds; i++) {
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                SSound_stop(&aSounds[i]);
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                SSound_close(&aSounds[i]);
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        }
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        alSourceStopv (MAX_SOURCES, sources);
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        alDeleteSources (MAX_SOURCES, sources);
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        alcMakeContextCurrent(NULL);
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        alcDestroyContext(context);
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        alcCloseDevice(device);
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        oalbReady = 0;
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        return;
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}
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/**
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 * char oalb_ready (void)  
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 *
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 *  ARGUMENTS
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 * -
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 *  DESCRIPTION
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 *
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 *  RETURN
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 * -
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 */
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char oalb_ready (void) {
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        return oalbReady;
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}
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/**
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 * const int32_t oalb_loadfile (const char *filename) 
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 *
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 *  ARGUMENTS
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 * -
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 *  DESCRIPTION
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 *
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 *  RETURN
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 * -
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 */
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const int32_t oalb_loadfile (const char *filename) {
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        int i;
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        if (oalbReady == 0) {
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                errno = EPERM;                
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                err_ret("(%s) WARN - OpenAL not initialized", prog);
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                return -1;
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        }
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        if(iNumSounds == MAX_SOUNDS) {
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                err_msg("(%s) WARN - Maximum number of sound samples reached", prog);
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                return -3;
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        }
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        for(i = 0; i < iNumSounds; i++)
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                if(strcmp(aSounds[i].Filename, filename) == 0)
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                        return i;
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        if(SSound_load(&aSounds[iNumSounds], filename))
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                return iNumSounds++;
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        else
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                return -2;
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}
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void oalb_setvolume (const uint32_t iIndex,  const char cPercentage) {
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        if (oalbReady == 0) {
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                errno = EPERM;                
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                err_ret("(%s) WARN - OpenAL not initialized", prog);
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                return;
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        }
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        /*Set volume for sound number index*/
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        if(iIndex < 0 || iIndex >= iNumSounds) {
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                errno = EINVAL;
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                err_ret("(%s) ERROR - Index (%d) out of bounds", prog, iIndex);
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                return;
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        }
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        if(cPercentage > 100)
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                SSound_volume(&aSounds[iIndex], 1.0f);
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        else
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                SSound_volume(&aSounds[iIndex], cPercentage / 100.0f);
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        if (AlGetError2("(%s) ERROR -  Failed to set volume for sound %d\n", iIndex) != AL_TRUE)
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                return;
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        alGetError();  /* clear any AL errors beforehand */
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        return;
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}
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void oalb_setglobalvolume (const char cPercentage) {
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        if (oalbReady == 0) {
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                errno = EPERM;                
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                err_ret("(%s) WARN - OpenAL not initialized", prog);
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                return;
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        }
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        /*Set volume for all sounds*/		
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        if(cPercentage > 100)
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                alListenerf (AL_GAIN, 1.0f);
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        else
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                alListenerf (AL_GAIN, cPercentage / 100.0f);
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        if (AlGetError("(%s) ERROR -  Failed to set global volume") != AL_TRUE)
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                return;
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        alGetError();  /* clear any AL errors beforehand */
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        return;
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}
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void oalb_togglemute (void) {
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        /*Mute or unmute sound*/
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        ALfloat mute;
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        if (oalbReady == AL_FALSE) {
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                errno = EPERM;                
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                err_ret("(%s) WARN - OpenAL not initialized", prog);
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                return;
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        }
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        alGetListenerf (AL_GAIN, &mute);
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        if (mute > 0) 
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                mute = 0;
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        else
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                mute = 1.0;
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        alListenerf (AL_GAIN, mute);
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        if (AlGetError("(%s) ERROR -  Failed to set mute property") != AL_TRUE)
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                return;
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        alGetError();  /* clear any AL errors beforehand */
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        return;
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}
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 /*
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 ALboolean openal_fade (uint32_t index, uint16_t quantity, ALboolean direction) {
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 /*Fade in or out by calling a helper thread
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 #ifndef _WIN32
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 pthread_t thread;
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 #else
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 HANDLE Thread;
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 DWORD threadID;
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 #endif
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 fade_t *fade;
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   296
 
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 if (oalbReady == AL_FALSE) {
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 errno = EPERM;                
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 err_ret("(%s) WARN - OpenAL not initialized", prog);
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 return AL_FALSE;
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 }
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   302
 
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 fade = (fade_t*) Malloc(sizeof(fade_t));
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 fade->index = index;
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 fade->quantity = quantity;
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   306
 
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 if (index >= globalsize) {
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 errno = EINVAL;
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 err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);
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 return AL_FALSE;
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   311
 }
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   312
 
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 switch (direction) {
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   314
 case FADE_IN:
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 #ifndef _WIN32
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 pthread_create(&thread, NULL, helper_fadein, (void*) fade);
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 #else
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 Thread = _beginthread(&helper_fadein, 0, (void*) fade);
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 #endif
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 break;
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   321
 case FADE_OUT:
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   322
 #ifndef _WIN32
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 pthread_create(&thread, NULL, helper_fadeout, (void*) fade);
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   324
 #else
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 Thread = _beginthread(&helper_fadeout, 0, (void*) fade);
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   326
 #endif	
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   327
 break;
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   328
 default:
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   329
 errno = EINVAL;
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 err_ret("(%s) ERROR - Unknown direction for fading", prog, index, globalindex);
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   331
 free(fade);
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   332
 return AL_FALSE;
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   333
 break;
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   334
 }
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   335
 
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 #ifndef _WIN32
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 pthread_detach(thread);
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 #endif
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 alGetError();  /* clear any AL errors beforehand 
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 return AL_TRUE;
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 }
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 ALboolean openal_fadeout (uint32_t index, uint16_t quantity) {
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 /*wrapper for fadeout
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 return openal_fade(index, quantity, FADE_OUT);
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 }
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 ALboolean openal_fadein (uint32_t index, uint16_t quantity) {
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 /*wrapper for fadein
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 return openal_fade(index, quantity, FADE_IN);
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 }
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   357
 
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 ALboolean openal_setposition (uint32_t index, float x, float y, float z) {
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 if (oalbReady == AL_FALSE) {
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 errno = EPERM;                
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 err_ret("(%s) WARN - OpenAL not initialized", prog);
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 return AL_FALSE;
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 }
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 if (index >= globalsize) {
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 errno = EINVAL;
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 err_ret("(%s) ERROR - Index out of bounds (got %d, max %d)", prog, index, globalindex);
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 return AL_FALSE;
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 }
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 alSource3f(Sources[index], AL_POSITION, x, y, z);
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 if (AlGetError2("(%s) ERROR - Failed to set position for sound %d)", index) != AL_TRUE)
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 return AL_FALSE;
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 return AL_TRUE;
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 }
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 */
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void oalb_playsound (const uint32_t iIndex, const char bLoop) {
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        if (oalbReady == AL_FALSE) {
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                errno = EPERM;                
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                err_ret("(%s) WARN - OpenAL not initialized", prog);
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                return;
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        }
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        /*Play sound number index*/
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        if(iIndex < 0 || iIndex >= iNumSounds) {
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                errno = EINVAL;
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                err_ret("(%s) ERROR - Index (%d) out of bounds", prog, iIndex);
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                return;
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        }
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        SSound_play(&aSounds[iIndex], bLoop);
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        alGetError();  /* clear any AL errors beforehand */
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        return;
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}
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   402
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   403
void oalb_pausesound (const uint32_t iIndex) {
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        if (oalbReady == AL_FALSE) {
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   405
                errno = EPERM;                
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                err_ret("(%s) WARN - OpenAL not initialized", prog);
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                return;
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        }
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        /*Pause sound number index*/
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        if(iIndex < 0 || iIndex >= iNumSounds) {
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                errno = EINVAL;
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                err_ret("(%s) ERROR - Index (%d) out of bounds", prog, iIndex);
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                return;
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        }
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        SSound_pause(&aSounds[iIndex]);
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   417
        
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        if (AlGetError2("(%s) ERROR - Failed to pause sound %d)", iIndex) != AL_TRUE)
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                return;
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        return;
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}
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void oalb_stopsound (const uint32_t iIndex) {
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        if (oalbReady == AL_FALSE) {
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                errno = EPERM;                
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                err_ret("(%s) WARN - OpenAL not initialized", prog);
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                return;
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        }
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   431
        
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        /*Stop sound number index*/
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        if(iIndex < 0 || iIndex >= iNumSounds) {
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                errno = EINVAL;
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                err_ret("(%s) ERROR - Index (%d) out of bounds", prog, iIndex);
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                return;
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   437
        }
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        SSound_stop(&aSounds[iIndex]);
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   439
        
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        if (AlGetError2("(%s) ERROR - Failed to stop sound %d)", iIndex) != AL_TRUE)
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                return;
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        alGetError();  /* clear any AL errors beforehand */
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        return;
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}