Mercurial > sdl-ios-xcode
view 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 |
line wrap: on
line source
<HTML ><HEAD ><TITLE >SDL_SysWMEvent</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.64 "><LINK REL="HOME" TITLE="SDL Library Documentation" HREF="index.html"><LINK REL="UP" TITLE="SDL Event Structures." HREF="eventstructures.html"><LINK REL="PREVIOUS" TITLE="SDL_ExposeEvent" HREF="sdlexposeevent.html"><LINK REL="NEXT" TITLE="SDL_UserEvent" HREF="sdluserevent.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFF8DC" TEXT="#000000" LINK="#0000ee" VLINK="#551a8b" ALINK="#ff0000" ><DIV CLASS="NAVHEADER" ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >SDL Library Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="sdlexposeevent.html" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="sdluserevent.html" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SDLSYSWMEVENT" >SDL_SysWMEvent</A ></H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN4154" ></A ><H2 >Name</H2 >SDL_SysWMEvent -- Platform-dependent window manager event.</DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4157" ></A ><H2 >Description</H2 ><P >The system window manager event contains a pointer to system-specific information about unknown window manager events. If you enable this event using <A HREF="sdleventstate.html" ><TT CLASS="FUNCTION" >SDL_EventState()</TT ></A >, it will be generated whenever unhandled events are received from the window manager. This can be used, for example, to implement cut-and-paste in your application. <PRE CLASS="PROGRAMLISTING" >typedef struct { Uint8 type; /* Always SDL_SysWM */ } SDL_SysWMEvent;</PRE > If you want to obtain system-specific information about the window manager, you can fill the version member of a <SPAN CLASS="STRUCTNAME" >SDL_SysWMinfo</SPAN > structure (details can be found in <TT CLASS="FILENAME" >SDL_syswm.h</TT >, which must be included) using the <TT CLASS="FUNCTION" >SDL_VERSION()</TT > macro found in <TT CLASS="FILENAME" >SDL_version.h</TT >, and pass it to the function: <DIV CLASS="FUNCSYNOPSIS" ><A NAME="AEN4167" ></A ><P ></P ><P ><CODE ><CODE CLASS="FUNCDEF" >int <B CLASS="FSFUNC" >SDL_GetWMInfo</B ></CODE >(SDL_SysWMinfo *info);</CODE ></P ><P ></P ></DIV ></P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4172" ></A ><H2 >See Also</H2 ><P ><A HREF="sdleventstate.html" ><TT CLASS="FUNCTION" >SDL_EventState</TT ></A ></P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sdlexposeevent.html" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sdluserevent.html" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SDL_ExposeEvent</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="eventstructures.html" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SDL_UserEvent</TD ></TR ></TABLE ></DIV ></BODY ></HTML >