Mercurial > sdl-ios-xcode
annotate include/SDL.h @ 765:4c2ba6161939
Editors Note: The original patch was modified to use SDL_Delay() instead of
nanosleep because nanosleep may not be portable to all systems
using SDL with the ALSA backend. This may be a moot point with
the switch to blocking writes anyway...
Date: Sat, 27 Dec 2003 21:47:36 +0100
From: Michel Daenzer
To: Debian Bug Tracking System
Subject: [SDL] Bug#225252: [PATCH] ALSA fixes
Package: libsdl1.2debian-all
Version: 1.2.6-2
Severity: normal
Tags: patch
For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with
SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU
usage, interrupted sound and stuttering in some games here. Taking a nanosleep
whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more
efficient to use blocking mode for the actual sound playback. Feedback from the
SDL and ALSA lists appreciated.
The patch also fixes the default ALSA device to be used.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 04 Jan 2004 15:40:50 +0000 |
| parents | 9154ec9ca3d2 |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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Updated the headers with the correct e-mail address
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Main include header for the SDL library */ | |
| 29 | |
| 30 #ifndef _SDL_H | |
| 31 #define _SDL_H | |
| 32 | |
| 33 #include "SDL_main.h" | |
| 34 #include "SDL_types.h" | |
| 35 #include "SDL_getenv.h" | |
| 36 #include "SDL_error.h" | |
| 37 #include "SDL_rwops.h" | |
| 38 #include "SDL_timer.h" | |
| 39 #include "SDL_audio.h" | |
| 40 #include "SDL_cdrom.h" | |
| 41 #include "SDL_joystick.h" | |
| 42 #include "SDL_events.h" | |
| 43 #include "SDL_video.h" | |
| 44 #include "SDL_byteorder.h" | |
| 45 #include "SDL_version.h" | |
| 46 | |
| 47 #include "begin_code.h" | |
| 48 /* Set up for C function definitions, even when using C++ */ | |
| 49 #ifdef __cplusplus | |
| 50 extern "C" { | |
| 51 #endif | |
| 52 | |
| 53 /* As of version 0.5, SDL is loaded dynamically into the application */ | |
| 54 | |
| 55 /* These are the flags which may be passed to SDL_Init() -- you should | |
| 56 specify the subsystems which you will be using in your application. | |
| 57 */ | |
| 58 #define SDL_INIT_TIMER 0x00000001 | |
| 59 #define SDL_INIT_AUDIO 0x00000010 | |
| 60 #define SDL_INIT_VIDEO 0x00000020 | |
| 61 #define SDL_INIT_CDROM 0x00000100 | |
| 62 #define SDL_INIT_JOYSTICK 0x00000200 | |
| 63 #define SDL_INIT_NOPARACHUTE 0x00100000 /* Don't catch fatal signals */ | |
| 64 #define SDL_INIT_EVENTTHREAD 0x01000000 /* Not supported on all OS's */ | |
| 65 #define SDL_INIT_EVERYTHING 0x0000FFFF | |
| 66 | |
| 67 /* This function loads the SDL dynamically linked library and initializes | |
| 68 * the subsystems specified by 'flags' (and those satisfying dependencies) | |
| 69 * Unless the SDL_INIT_NOPARACHUTE flag is set, it will install cleanup | |
| 70 * signal handlers for some commonly ignored fatal signals (like SIGSEGV) | |
| 71 */ | |
|
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72 extern DECLSPEC int SDLCALL SDL_Init(Uint32 flags); |
| 0 | 73 |
| 74 /* This function initializes specific SDL subsystems */ | |
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75 extern DECLSPEC int SDLCALL SDL_InitSubSystem(Uint32 flags); |
| 0 | 76 |
| 77 /* This function cleans up specific SDL subsystems */ | |
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78 extern DECLSPEC void SDLCALL SDL_QuitSubSystem(Uint32 flags); |
| 0 | 79 |
| 80 /* This function returns mask of the specified subsystems which have | |
| 81 been initialized. | |
| 82 If 'flags' is 0, it returns a mask of all initialized subsystems. | |
| 83 */ | |
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84 extern DECLSPEC Uint32 SDLCALL SDL_WasInit(Uint32 flags); |
| 0 | 85 |
| 86 /* This function cleans up all initialized subsystems and unloads the | |
| 87 * dynamically linked library. You should call it upon all exit conditions. | |
| 88 */ | |
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89 extern DECLSPEC void SDLCALL SDL_Quit(void); |
| 0 | 90 |
| 91 /* Ends C function definitions when using C++ */ | |
| 92 #ifdef __cplusplus | |
| 93 } | |
| 94 #endif | |
| 95 #include "close_code.h" | |
| 96 | |
| 97 #endif /* _SDL_H */ |