🛠️🐜 Antkeeper superbuild with dependencies included
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186 lines
4.9 KiB
186 lines
4.9 KiB
/*
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* OpenAL Helpers
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*
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* Copyright (c) 2011 by Chris Robinson <chris.kcat@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* This file contains routines to help with some menial OpenAL-related tasks,
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* such as opening a device and setting up a context, closing the device and
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* destroying its context, converting between frame counts and byte lengths,
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* finding an appropriate buffer format, and getting readable strings for
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* channel configs and sample types. */
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#include <time.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include "AL/al.h"
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#include "AL/alc.h"
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#include "AL/alext.h"
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#include "alhelpers.h"
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/* InitAL opens a device and sets up a context using default attributes, making
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* the program ready to call OpenAL functions. */
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int InitAL(char ***argv, int *argc)
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{
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const ALCchar *name;
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ALCdevice *device;
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ALCcontext *ctx;
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/* Open and initialize a device */
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device = NULL;
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if(argc && argv && *argc > 1 && strcmp((*argv)[0], "-device") == 0)
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{
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device = alcOpenDevice((*argv)[1]);
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if(!device)
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fprintf(stderr, "Failed to open \"%s\", trying default\n", (*argv)[1]);
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(*argv) += 2;
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(*argc) -= 2;
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}
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if(!device)
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device = alcOpenDevice(NULL);
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if(!device)
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{
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fprintf(stderr, "Could not open a device!\n");
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return 1;
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}
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ctx = alcCreateContext(device, NULL);
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if(ctx == NULL || alcMakeContextCurrent(ctx) == ALC_FALSE)
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{
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if(ctx != NULL)
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alcDestroyContext(ctx);
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alcCloseDevice(device);
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fprintf(stderr, "Could not set a context!\n");
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return 1;
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}
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name = NULL;
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if(alcIsExtensionPresent(device, "ALC_ENUMERATE_ALL_EXT"))
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name = alcGetString(device, ALC_ALL_DEVICES_SPECIFIER);
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if(!name || alcGetError(device) != AL_NO_ERROR)
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name = alcGetString(device, ALC_DEVICE_SPECIFIER);
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printf("Opened \"%s\"\n", name);
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return 0;
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}
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/* CloseAL closes the device belonging to the current context, and destroys the
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* context. */
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void CloseAL(void)
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{
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ALCdevice *device;
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ALCcontext *ctx;
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ctx = alcGetCurrentContext();
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if(ctx == NULL)
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return;
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device = alcGetContextsDevice(ctx);
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alcMakeContextCurrent(NULL);
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alcDestroyContext(ctx);
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alcCloseDevice(device);
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}
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const char *FormatName(ALenum format)
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{
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switch(format)
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{
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case AL_FORMAT_MONO8: return "Mono, U8";
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case AL_FORMAT_MONO16: return "Mono, S16";
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case AL_FORMAT_STEREO8: return "Stereo, U8";
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case AL_FORMAT_STEREO16: return "Stereo, S16";
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}
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return "Unknown Format";
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}
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <mmsystem.h>
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int altime_get(void)
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{
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static int start_time = 0;
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int cur_time;
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union {
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FILETIME ftime;
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ULARGE_INTEGER ulint;
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} systime;
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GetSystemTimeAsFileTime(&systime.ftime);
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/* FILETIME is in 100-nanosecond units, or 1/10th of a microsecond. */
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cur_time = (int)(systime.ulint.QuadPart/10000);
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if(!start_time)
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start_time = cur_time;
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return cur_time - start_time;
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}
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void al_nssleep(unsigned long nsec)
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{
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Sleep(nsec / 1000000);
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}
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#else
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#include <sys/time.h>
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#include <unistd.h>
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#include <time.h>
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int altime_get(void)
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{
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static int start_time = 0u;
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int cur_time;
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#if _POSIX_TIMERS > 0
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struct timespec ts;
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int ret = clock_gettime(CLOCK_REALTIME, &ts);
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if(ret != 0) return 0;
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cur_time = ts.tv_sec*1000 + ts.tv_nsec/1000000;
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#else /* _POSIX_TIMERS > 0 */
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struct timeval tv;
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int ret = gettimeofday(&tv, NULL);
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if(ret != 0) return 0;
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cur_time = tv.tv_sec*1000 + tv.tv_usec/1000;
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#endif
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if(!start_time)
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start_time = cur_time;
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return cur_time - start_time;
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}
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void al_nssleep(unsigned long nsec)
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{
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struct timespec ts, rem;
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ts.tv_sec = nsec / 1000000000ul;
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ts.tv_nsec = nsec % 1000000000ul;
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while(nanosleep(&ts, &rem) == -1 && errno == EINTR)
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ts = rem;
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}
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#endif
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