Mercurial > sdl-ios-xcode
annotate docs/html/sdleventstate.html @ 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 | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_EventState</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Event Functions." | |
| 14 HREF="eventfunctions.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_GetEventFilter" | |
| 17 HREF="sdlgeteventfilter.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_GetKeyState" | |
| 20 HREF="sdlgetkeystate.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="REFENTRY" | |
| 23 BGCOLOR="#FFF8DC" | |
| 24 TEXT="#000000" | |
| 25 LINK="#0000ee" | |
| 26 VLINK="#551a8b" | |
| 27 ALINK="#ff0000" | |
| 28 ><DIV | |
| 29 CLASS="NAVHEADER" | |
| 30 ><TABLE | |
| 31 WIDTH="100%" | |
| 32 BORDER="0" | |
| 33 CELLPADDING="0" | |
| 34 CELLSPACING="0" | |
| 35 ><TR | |
| 36 ><TH | |
| 37 COLSPAN="3" | |
| 38 ALIGN="center" | |
| 39 >SDL Library Documentation</TH | |
| 40 ></TR | |
| 41 ><TR | |
| 42 ><TD | |
| 43 WIDTH="10%" | |
| 44 ALIGN="left" | |
| 45 VALIGN="bottom" | |
| 46 ><A | |
| 47 HREF="sdlgeteventfilter.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 ></TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="sdlgetkeystate.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><H1 | |
| 69 ><A | |
| 70 NAME="SDLEVENTSTATE" | |
| 71 >SDL_EventState</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN5258" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_EventState -- This function allows you to set the state of processing certain events.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN5261" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN5262" |
| 0 | 92 ></A |
| 93 ><P | |
| 94 ></P | |
| 95 ><PRE | |
| 96 CLASS="FUNCSYNOPSISINFO" | |
| 97 >#include "SDL.h"</PRE | |
| 98 ><P | |
| 99 ><CODE | |
| 100 ><CODE | |
| 101 CLASS="FUNCDEF" | |
| 102 >Uint8 <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_EventState</B | |
| 105 ></CODE | |
| 106 >(Uint8 type, int state);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN5268" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >This function allows you to set the state of processing certain event <TT | |
| 121 CLASS="PARAMETER" | |
| 122 ><I | |
| 123 >type</I | |
| 124 ></TT | |
| 125 >'s.</P | |
| 126 ><P | |
| 127 >If <TT | |
| 128 CLASS="PARAMETER" | |
| 129 ><I | |
| 130 >state</I | |
| 131 ></TT | |
| 132 > is set to <TT | |
| 133 CLASS="LITERAL" | |
| 134 >SDL_IGNORE</TT | |
| 135 >, | |
| 136 that event <TT | |
| 137 CLASS="PARAMETER" | |
| 138 ><I | |
| 139 >type</I | |
| 140 ></TT | |
| 141 > will be automatically dropped from the event queue and will | |
| 142 not be filtered.</P | |
| 143 ><P | |
| 144 >If <TT | |
| 145 CLASS="PARAMETER" | |
| 146 ><I | |
| 147 >state</I | |
| 148 ></TT | |
| 149 > is set to <TT | |
| 150 CLASS="LITERAL" | |
| 151 >SDL_ENABLE</TT | |
| 152 >, | |
| 153 that event <TT | |
| 154 CLASS="PARAMETER" | |
| 155 ><I | |
| 156 >type</I | |
| 157 ></TT | |
| 158 > will be processed normally.</P | |
| 159 ><P | |
| 160 >If <TT | |
| 161 CLASS="PARAMETER" | |
| 162 ><I | |
| 163 >state</I | |
| 164 ></TT | |
| 165 > is set to <TT | |
| 166 CLASS="LITERAL" | |
| 167 >SDL_QUERY</TT | |
| 168 >, | |
| 169 <TT | |
| 170 CLASS="FUNCTION" | |
| 171 >SDL_EventState</TT | |
| 172 > will return the current processing | |
| 173 state of the specified event <TT | |
| 174 CLASS="PARAMETER" | |
| 175 ><I | |
| 176 >type</I | |
| 177 ></TT | |
| 178 >.</P | |
| 179 ><P | |
| 180 >A list of event <TT | |
| 181 CLASS="PARAMETER" | |
| 182 ><I | |
| 183 >type</I | |
| 184 ></TT | |
| 185 >'s can be found in the <A | |
| 186 HREF="sdlevent.html" | |
| 187 ><SPAN | |
| 188 CLASS="STRUCTNAME" | |
| 189 >SDL_Event</SPAN | |
| 190 ></A | |
| 191 > section.</P | |
| 192 ></DIV | |
| 193 ><DIV | |
| 194 CLASS="REFSECT1" | |
| 195 ><A | |
|
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196 NAME="AEN5289" |
| 0 | 197 ></A |
| 198 ><H2 | |
| 199 >See Also</H2 | |
| 200 ><P | |
| 201 ><A | |
| 202 HREF="sdlevent.html" | |
| 203 ><SPAN | |
| 204 CLASS="STRUCTNAME" | |
| 205 >SDL_Event</SPAN | |
| 206 ></A | |
| 207 ></P | |
| 208 ></DIV | |
| 209 ><DIV | |
| 210 CLASS="NAVFOOTER" | |
| 211 ><HR | |
| 212 ALIGN="LEFT" | |
| 213 WIDTH="100%"><TABLE | |
| 214 WIDTH="100%" | |
| 215 BORDER="0" | |
| 216 CELLPADDING="0" | |
| 217 CELLSPACING="0" | |
| 218 ><TR | |
| 219 ><TD | |
| 220 WIDTH="33%" | |
| 221 ALIGN="left" | |
| 222 VALIGN="top" | |
| 223 ><A | |
| 224 HREF="sdlgeteventfilter.html" | |
| 225 >Prev</A | |
| 226 ></TD | |
| 227 ><TD | |
| 228 WIDTH="34%" | |
| 229 ALIGN="center" | |
| 230 VALIGN="top" | |
| 231 ><A | |
| 232 HREF="index.html" | |
| 233 >Home</A | |
| 234 ></TD | |
| 235 ><TD | |
| 236 WIDTH="33%" | |
| 237 ALIGN="right" | |
| 238 VALIGN="top" | |
| 239 ><A | |
| 240 HREF="sdlgetkeystate.html" | |
| 241 >Next</A | |
| 242 ></TD | |
| 243 ></TR | |
| 244 ><TR | |
| 245 ><TD | |
| 246 WIDTH="33%" | |
| 247 ALIGN="left" | |
| 248 VALIGN="top" | |
| 249 >SDL_GetEventFilter</TD | |
| 250 ><TD | |
| 251 WIDTH="34%" | |
| 252 ALIGN="center" | |
| 253 VALIGN="top" | |
| 254 ><A | |
| 255 HREF="eventfunctions.html" | |
| 256 >Up</A | |
| 257 ></TD | |
| 258 ><TD | |
| 259 WIDTH="33%" | |
| 260 ALIGN="right" | |
| 261 VALIGN="top" | |
| 262 >SDL_GetKeyState</TD | |
| 263 ></TR | |
| 264 ></TABLE | |
| 265 ></DIV | |
| 266 ></BODY | |
| 267 ></HTML | |
| 268 > |