Mercurial > sdl-ios-xcode
annotate docs/html/sdlglswapbuffers.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_GL_SwapBuffers</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_GL_SetAttribute" | |
| 17 HREF="sdlglsetattribute.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CreateYUVOverlay" | |
| 20 HREF="sdlcreateyuvoverlay.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="sdlglsetattribute.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="sdlcreateyuvoverlay.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="SDLGLSWAPBUFFERS" | |
| 71 >SDL_GL_SwapBuffers</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN2400" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_GL_SwapBuffers -- Swap OpenGL framebuffers/Update Display</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
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84 NAME="AEN2403" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN2404" |
| 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_GL_SwapBuffers</B | |
| 105 ></CODE | |
| 106 >(void );</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN2410" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Swap the OpenGL buffers, if double-buffering is supported.</P | |
| 121 ></DIV | |
| 122 ><DIV | |
| 123 CLASS="REFSECT1" | |
| 124 ><A | |
|
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125 NAME="AEN2413" |
| 0 | 126 ></A |
| 127 ><H2 | |
| 128 >See Also</H2 | |
| 129 ><P | |
| 130 ><A | |
| 131 HREF="sdlsetvideomode.html" | |
| 132 ><TT | |
| 133 CLASS="FUNCTION" | |
| 134 >SDL_SetVideoMode</TT | |
| 135 ></A | |
| 136 >, | |
| 137 <A | |
| 138 HREF="sdlglsetattribute.html" | |
| 139 ><TT | |
| 140 CLASS="FUNCTION" | |
| 141 >SDL_GL_SetAttribute</TT | |
| 142 ></A | |
| 143 ></P | |
| 144 ></DIV | |
| 145 ><DIV | |
| 146 CLASS="NAVFOOTER" | |
| 147 ><HR | |
| 148 ALIGN="LEFT" | |
| 149 WIDTH="100%"><TABLE | |
| 150 WIDTH="100%" | |
| 151 BORDER="0" | |
| 152 CELLPADDING="0" | |
| 153 CELLSPACING="0" | |
| 154 ><TR | |
| 155 ><TD | |
| 156 WIDTH="33%" | |
| 157 ALIGN="left" | |
| 158 VALIGN="top" | |
| 159 ><A | |
| 160 HREF="sdlglsetattribute.html" | |
| 161 >Prev</A | |
| 162 ></TD | |
| 163 ><TD | |
| 164 WIDTH="34%" | |
| 165 ALIGN="center" | |
| 166 VALIGN="top" | |
| 167 ><A | |
| 168 HREF="index.html" | |
| 169 >Home</A | |
| 170 ></TD | |
| 171 ><TD | |
| 172 WIDTH="33%" | |
| 173 ALIGN="right" | |
| 174 VALIGN="top" | |
| 175 ><A | |
| 176 HREF="sdlcreateyuvoverlay.html" | |
| 177 >Next</A | |
| 178 ></TD | |
| 179 ></TR | |
| 180 ><TR | |
| 181 ><TD | |
| 182 WIDTH="33%" | |
| 183 ALIGN="left" | |
| 184 VALIGN="top" | |
| 185 >SDL_GL_SetAttribute</TD | |
| 186 ><TD | |
| 187 WIDTH="34%" | |
| 188 ALIGN="center" | |
| 189 VALIGN="top" | |
| 190 ><A | |
| 191 HREF="video.html" | |
| 192 >Up</A | |
| 193 ></TD | |
| 194 ><TD | |
| 195 WIDTH="33%" | |
| 196 ALIGN="right" | |
| 197 VALIGN="top" | |
| 198 >SDL_CreateYUVOverlay</TD | |
| 199 ></TR | |
| 200 ></TABLE | |
| 201 ></DIV | |
| 202 ></BODY | |
| 203 ></HTML | |
| 204 > |