293 lines
4.7 KiB
C
293 lines
4.7 KiB
C
/*
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* Copyright (C) 2004 Christopher John Purnell
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* cjp@lost.org.uk
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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 General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <sys/time.h>
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#include <stdlib.h>
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#include <ansidecl.h>
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#include "al_listener.h"
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#include "al_source.h"
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#include "alc_context.h"
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#include "alc_error.h"
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AL_context *_alcCurrentContext = 0;
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static ALCvoid *_alcThread(ALCcontext *cc)
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{
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AL_context *ctx = cc;
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ALCdevice *dev = ctx->device;
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ALuint i;
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struct timeval tv;
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struct timespec ts;
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long ns = 1000000000 / dev->refresh;
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pthread_mutex_lock(&ctx->mutex);
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do
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{
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gettimeofday(&tv, 0);
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for (i = 0; i < dev->subdevs; i++)
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{
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AL_source *src;
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if ((src = ctx->sources[i]))
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{
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_alProcessSource(src);
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}
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}
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ts.tv_sec = tv.tv_sec;
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if ((ts.tv_nsec = (tv.tv_usec * 1000) + ns) >= 1000000000)
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{
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ts.tv_sec += 1;
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ts.tv_nsec -= 1000000000;
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}
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}
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while (pthread_cond_timedwait(&ctx->cond, &ctx->mutex, &ts));
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pthread_mutex_unlock(&ctx->mutex);
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return 0;
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}
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static ALCboolean _alcCreateContext(AL_context *ctx)
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{
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ALCdevice *dev = ctx->device;
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ALuint i;
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pthread_mutex_init(&ctx->mutex, 0);
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if (!(ctx->sources = malloc(dev->subdevs * sizeof(AL_source*))))
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{
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return AL_FALSE;
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}
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for (i = 0; i < dev->subdevs; i++)
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{
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ctx->sources[i] = 0;
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}
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if (!dev->sync)
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{
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pthread_cond_init(&ctx->cond, 0);
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if (pthread_create(&ctx->thread, 0, _alcThread, ctx))
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{
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return AL_FALSE;
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}
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}
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return ALC_TRUE;
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}
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static ALCvoid _alcDestroyContext(AL_context *ctx)
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{
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ALCdevice *dev;
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ALuint i;
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dev = ctx->device;
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for (i = 0; i < dev->subdevs; i++)
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{
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AL_source *src;
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if ((src = ctx->sources[i]))
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{
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_alDeleteSource(src);
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}
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}
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if (ctx->thread)
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{
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pthread_cond_signal(&ctx->cond);
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pthread_join(ctx->thread, 0);
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pthread_cond_destroy(&ctx->cond);
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}
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if (ctx->sources)
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{
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free(ctx->sources);
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}
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pthread_mutex_destroy(&ctx->mutex);
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free(ctx);
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}
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ALCcontext *alcCreateContext(ALCdevice *dev, ALCint *attrlist)
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{
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AL_context *ctx;
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if (!dev)
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{
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_alcSetError(ALC_INVALID_DEVICE);
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return 0;
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}
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if (!(ctx = malloc(sizeof(AL_context))))
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{
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_alcSetError(ALC_OUT_OF_MEMORY);
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return 0;
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}
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ctx->device = dev;
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while (attrlist)
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{
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ALCint value;
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switch (*(attrlist++))
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{
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case ALC_FREQUENCY:
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if ((value = *(attrlist++)) > 0)
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{
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dev->freq = value;
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}
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break;
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case ALC_REFRESH:
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if ((value = *(attrlist++)) > 0)
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{
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dev->refresh = value;
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}
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break;
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case ALC_SYNC:
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dev->sync = *(attrlist++) ? AL_TRUE: AL_FALSE;
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break;
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default:
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attrlist = 0;
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break;
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}
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}
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if (dev->refresh > dev->freq)
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{
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dev->refresh = dev->freq;
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}
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ctx->sources = 0;
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ctx->thread = 0;
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_alcLoadSpeakers(ctx->speakers);
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_alInitListener(&ctx->listener, ctx->speakers);
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ctx->doppler_factor = 1.0f;
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ctx->doppler_velocity = 1.0f;
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ctx->distance_model = AL_INVERSE_DISTANCE;
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ctx->distance_func = _alDistanceInverse;
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if (_alcCreateContext(ctx))
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return ctx;
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_alcDestroyContext(ctx);
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_alcSetError(ALC_OUT_OF_MEMORY);
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return 0;
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}
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ALCenum alcDestroyContext(ALCcontext *cc)
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{
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AL_context *ctx;
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if (!(ctx = cc))
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{
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_alcSetError(ALC_INVALID_CONTEXT);
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return ALC_INVALID_CONTEXT;
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}
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if (ctx == _alcCurrentContext)
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{
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_alcCurrentContext = 0;
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}
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_alcDestroyContext(ctx);
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return ALC_NO_ERROR;
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}
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ALCenum alcMakeContextCurrent(ALCcontext *cc)
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{
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_alcCurrentContext = cc;
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return ALC_NO_ERROR;
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}
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ALCcontext *alcGetCurrentContext(ALCvoid)
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{
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return _alcCurrentContext;
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}
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ALCdevice *alcGetContextsDevice(ALCcontext *cc)
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{
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AL_context *ctx;
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if (!(ctx = cc))
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{
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_alcSetError(ALC_INVALID_CONTEXT);
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return 0;
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}
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return ctx->device;
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}
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ALCvoid alcSuspendContext(ALCcontext *cc ATTRIBUTE_UNUSED)
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{
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/* FIXME */
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}
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ALCvoid *alcProcessContext(ALCcontext *cc)
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{
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AL_context *ctx;
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ALCdevice *dev;
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ALuint i;
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if (!(ctx = cc))
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{
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_alcSetError(ALC_INVALID_CONTEXT);
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return 0;
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}
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if (ctx->thread)
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{
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return cc;
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}
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_alcLockContext(ctx);
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dev = ctx->device;
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for (i = 0; i < dev->subdevs; i++)
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{
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AL_source *src;
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if ((src = ctx->sources[i]))
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{
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_alProcessSource(src);
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}
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}
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_alcUnlockContext(ctx);
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return cc;
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}
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