annotate docs/man3/SDL_SetTimer.3 @ 1282:217f5d5a49e5

Date: Sat, 15 Jan 2005 02:01:51 +0000 (UTC) From: jimrandomh Subject: [SDL] Re: Modifier keys pressed during initialization stick I wrote a simple test program which initializes SDL, prints the SDL version number, then prints any keydown and keyup events with their modifiers. (Source code below). Compilation was done using Visual Studio 6, release mode. My test sequence was: Start a command prompt. Type the name of the test program. shift down enter down (program starts) Wait for window to appear enter up shift up spacebar down spacebar up Under Windows 98, the output was correct: SDL 1.2.8 left shift down shift-return down shift-return up left shift up space down space up Under Windows 2000 and under Windows XP, the output was: SDL 1.2.8 shift-space down shift-space up Since shift was not held at the time space was pressed, this is incorrect. Similar results were observed with launching in different ways (including double-clicking in Windows Explorer), so it does not depend on the launching terminal.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 29 Jan 2006 07:57:13 +0000
parents e5bc29de3f0a
children 546f7c1eb755
rev   line source
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1 .TH "SDL_SetTimer" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_SetTimer\- Set a callback to run after the specified number of milliseconds has elapsed\&.
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBint \fBSDL_SetTimer\fP\fR(\fBUint32 interval, SDL_TimerCallback callback\fR);
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9 .SH "CALLBACK"
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10 .PP
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11 /* Function prototype for the timer callback function */ typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);
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12 .SH "DESCRIPTION"
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13 .PP
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14 Set a callback to run after the specified number of milliseconds has elapsed\&. The callback function is passed the current timer interval and returns the next timer interval\&. If the returned value is the same as the one passed in, the periodic alarm continues, otherwise a new alarm is scheduled\&.
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15 .PP
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16 To cancel a currently running timer, call \fBSDL_SetTimer(0, NULL);\fP
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17 .PP
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18 The timer callback function may run in a different thread than your main constant, and so shouldn\&'t call any functions from within itself\&.
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19 .PP
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20 The maximum resolution of this timer is 10 ms, which means that if you request a 16 ms timer, your callback will run approximately 20 ms later on an unloaded system\&. If you wanted to set a flag signaling a frame update at 30 frames per second (every 33 ms), you might set a timer for 30 ms (see example below)\&.
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21 .PP
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22 If you use this function, you need to pass \fBSDL_INIT_TIMER\fP to \fBSDL_Init()\fP\&.
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23 .PP
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24 .RS
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25 \fBNote:
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26 .PP
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27 This function is kept for compatibility but has been superseded by the new timer functions \fISDL_AddTimer\fR and \fISDL_RemoveTimer\fR which support multiple timers\&.
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28 .RE
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29 .SH "EXAMPLES"
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30 .PP
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31 .PP
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32 .nf
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33 \f(CWSDL_SetTimer((33/10)*10, my_callback);\fR
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34 .fi
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35 .PP
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36 .SH "SEE ALSO"
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37 .PP
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38 \fI\fBSDL_AddTimer\fP\fR
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39 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01