Mercurial > sdl-ios-xcode
annotate docs/html/sdlsyswmevent.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_SysWMEvent</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="SDL Event Structures." | |
| 14 HREF="eventstructures.html"><LINK | |
| 15 REL="PREVIOUS" | |
|
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16 TITLE="SDL_ExposeEvent" |
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17 HREF="sdlexposeevent.html"><LINK |
| 0 | 18 REL="NEXT" |
| 19 TITLE="SDL_UserEvent" | |
| 20 HREF="sdluserevent.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 | |
|
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47 HREF="sdlexposeevent.html" |
| 0 | 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="sdluserevent.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="SDLSYSWMEVENT" | |
| 71 >SDL_SysWMEvent</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN4154" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_SysWMEvent -- Platform-dependent window manager event.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSECT1" | |
| 83 ><A | |
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84 NAME="AEN4157" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Description</H2 | |
| 88 ><P | |
| 89 >The system window manager event contains a pointer to system-specific | |
| 90 information about unknown window manager events. If you enable this event | |
| 91 using | |
| 92 <A | |
| 93 HREF="sdleventstate.html" | |
| 94 ><TT | |
| 95 CLASS="FUNCTION" | |
| 96 >SDL_EventState()</TT | |
| 97 ></A | |
| 98 >, | |
| 99 it will be generated whenever unhandled events are received from the window | |
| 100 manager. This can be used, for example, to implement cut-and-paste in your | |
| 101 application. | |
| 102 | |
| 103 <PRE | |
| 104 CLASS="PROGRAMLISTING" | |
| 105 >typedef struct { | |
| 106 Uint8 type; /* Always SDL_SysWM */ | |
| 107 } SDL_SysWMEvent;</PRE | |
| 108 > | |
| 109 | |
| 110 If you want to obtain system-specific information about the window manager, | |
| 111 you can fill the version member of a <SPAN | |
| 112 CLASS="STRUCTNAME" | |
| 113 >SDL_SysWMinfo</SPAN | |
| 114 > | |
| 115 structure (details can be found in <TT | |
| 116 CLASS="FILENAME" | |
| 117 >SDL_syswm.h</TT | |
| 118 >, which must be included) using the <TT | |
| 119 CLASS="FUNCTION" | |
| 120 >SDL_VERSION()</TT | |
| 121 > macro found in | |
| 122 <TT | |
| 123 CLASS="FILENAME" | |
| 124 >SDL_version.h</TT | |
| 125 >, and pass it to the | |
| 126 function: | |
| 127 <DIV | |
| 128 CLASS="FUNCSYNOPSIS" | |
| 129 ><A | |
|
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130 NAME="AEN4167" |
| 0 | 131 ></A |
| 132 ><P | |
| 133 ></P | |
| 134 ><P | |
| 135 ><CODE | |
| 136 ><CODE | |
| 137 CLASS="FUNCDEF" | |
| 138 >int <B | |
| 139 CLASS="FSFUNC" | |
| 140 >SDL_GetWMInfo</B | |
| 141 ></CODE | |
| 142 >(SDL_SysWMinfo *info);</CODE | |
| 143 ></P | |
| 144 ><P | |
| 145 ></P | |
| 146 ></DIV | |
| 147 ></P | |
| 148 ></DIV | |
| 149 ><DIV | |
| 150 CLASS="REFSECT1" | |
| 151 ><A | |
|
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152 NAME="AEN4172" |
| 0 | 153 ></A |
| 154 ><H2 | |
| 155 >See Also</H2 | |
| 156 ><P | |
| 157 ><A | |
| 158 HREF="sdleventstate.html" | |
| 159 ><TT | |
| 160 CLASS="FUNCTION" | |
| 161 >SDL_EventState</TT | |
| 162 ></A | |
| 163 ></P | |
| 164 ></DIV | |
| 165 ><DIV | |
| 166 CLASS="NAVFOOTER" | |
| 167 ><HR | |
| 168 ALIGN="LEFT" | |
| 169 WIDTH="100%"><TABLE | |
| 170 WIDTH="100%" | |
| 171 BORDER="0" | |
| 172 CELLPADDING="0" | |
| 173 CELLSPACING="0" | |
| 174 ><TR | |
| 175 ><TD | |
| 176 WIDTH="33%" | |
| 177 ALIGN="left" | |
| 178 VALIGN="top" | |
| 179 ><A | |
|
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180 HREF="sdlexposeevent.html" |
| 0 | 181 >Prev</A |
| 182 ></TD | |
| 183 ><TD | |
| 184 WIDTH="34%" | |
| 185 ALIGN="center" | |
| 186 VALIGN="top" | |
| 187 ><A | |
| 188 HREF="index.html" | |
| 189 >Home</A | |
| 190 ></TD | |
| 191 ><TD | |
| 192 WIDTH="33%" | |
| 193 ALIGN="right" | |
| 194 VALIGN="top" | |
| 195 ><A | |
| 196 HREF="sdluserevent.html" | |
| 197 >Next</A | |
| 198 ></TD | |
| 199 ></TR | |
| 200 ><TR | |
| 201 ><TD | |
| 202 WIDTH="33%" | |
| 203 ALIGN="left" | |
| 204 VALIGN="top" | |
|
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205 >SDL_ExposeEvent</TD |
| 0 | 206 ><TD |
| 207 WIDTH="34%" | |
| 208 ALIGN="center" | |
| 209 VALIGN="top" | |
| 210 ><A | |
| 211 HREF="eventstructures.html" | |
| 212 >Up</A | |
| 213 ></TD | |
| 214 ><TD | |
| 215 WIDTH="33%" | |
| 216 ALIGN="right" | |
| 217 VALIGN="top" | |
| 218 >SDL_UserEvent</TD | |
| 219 ></TR | |
| 220 ></TABLE | |
| 221 ></DIV | |
| 222 ></BODY | |
| 223 ></HTML | |
| 224 > |