Mercurial > sdl-ios-xcode
annotate docs/html/sdlwarpmouse.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_WarpMouse</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="Video" | |
| 14 HREF="video.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_DisplayFormatAlpha" | |
| 17 HREF="sdldisplayformatalpha.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CreateCursor" | |
| 20 HREF="sdlcreatecursor.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="sdldisplayformatalpha.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="sdlcreatecursor.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="SDLWARPMOUSE" | |
| 71 >SDL_WarpMouse</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN2081" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_WarpMouse -- Set the position of the mouse cursor.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN2084" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN2085" |
| 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 >void <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_WarpMouse</B | |
| 105 ></CODE | |
| 106 >(Uint16 x, Uint16 y);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN2091" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Set the position of the mouse cursor (generates a mouse motion event).</P | |
| 121 ></DIV | |
| 122 ><DIV | |
| 123 CLASS="REFSECT1" | |
| 124 ><A | |
|
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125 NAME="AEN2094" |
| 0 | 126 ></A |
| 127 ><H2 | |
| 128 >See Also</H2 | |
| 129 ><P | |
| 130 ><A | |
| 131 HREF="sdlmousemotionevent.html" | |
| 132 ><SPAN | |
| 133 CLASS="STRUCTNAME" | |
| 134 >SDL_MouseMotionEvent</SPAN | |
| 135 ></A | |
| 136 ></P | |
| 137 ></DIV | |
| 138 ><DIV | |
| 139 CLASS="NAVFOOTER" | |
| 140 ><HR | |
| 141 ALIGN="LEFT" | |
| 142 WIDTH="100%"><TABLE | |
| 143 WIDTH="100%" | |
| 144 BORDER="0" | |
| 145 CELLPADDING="0" | |
| 146 CELLSPACING="0" | |
| 147 ><TR | |
| 148 ><TD | |
| 149 WIDTH="33%" | |
| 150 ALIGN="left" | |
| 151 VALIGN="top" | |
| 152 ><A | |
| 153 HREF="sdldisplayformatalpha.html" | |
| 154 >Prev</A | |
| 155 ></TD | |
| 156 ><TD | |
| 157 WIDTH="34%" | |
| 158 ALIGN="center" | |
| 159 VALIGN="top" | |
| 160 ><A | |
| 161 HREF="index.html" | |
| 162 >Home</A | |
| 163 ></TD | |
| 164 ><TD | |
| 165 WIDTH="33%" | |
| 166 ALIGN="right" | |
| 167 VALIGN="top" | |
| 168 ><A | |
| 169 HREF="sdlcreatecursor.html" | |
| 170 >Next</A | |
| 171 ></TD | |
| 172 ></TR | |
| 173 ><TR | |
| 174 ><TD | |
| 175 WIDTH="33%" | |
| 176 ALIGN="left" | |
| 177 VALIGN="top" | |
| 178 >SDL_DisplayFormatAlpha</TD | |
| 179 ><TD | |
| 180 WIDTH="34%" | |
| 181 ALIGN="center" | |
| 182 VALIGN="top" | |
| 183 ><A | |
| 184 HREF="video.html" | |
| 185 >Up</A | |
| 186 ></TD | |
| 187 ><TD | |
| 188 WIDTH="33%" | |
| 189 ALIGN="right" | |
| 190 VALIGN="top" | |
| 191 >SDL_CreateCursor</TD | |
| 192 ></TR | |
| 193 ></TABLE | |
| 194 ></DIV | |
| 195 ></BODY | |
| 196 ></HTML | |
| 197 > |