Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_CreateSemaphore.3 @ 664:abfdc08eb289
Date: Sun, 3 Aug 2003 22:07:57 +0200
From: Max Horn
Subject: SDL OSX fullscreen FIX
the attached patch fixes the fullscreen problems on SDL/OSX. The cause
was that click events are bounded by winRect. Now, winRect is set to
the size of the video surface. But if you e.g. request a 640x420
surface, you might get a 640x480 "real" surface. Still,
SDL_VideoSurface->h will be set to 420! Thus, the upper 60 pixels in my
example received no mouse down events.
My fix simply disables this clipping when in full screen mode - after
all, all clicks then should be inside the screen surface. Higher SDL
functions ensure that the coordinates then are clipped to 640x420. It
works fine in all my tests here. I don't know if it's the right thing
to do in multi screen scenarios, though.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 04 Aug 2003 01:00:30 +0000 |
parents | e5bc29de3f0a |
children | 546f7c1eb755 |
rev | line source |
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181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
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1 .TH "SDL_CreateSemaphore" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" |
0 | 2 .SH "NAME" |
3 SDL_CreateSemaphore\- Creates a new semaphore and assigns an initial value to it\&. | |
4 .SH "SYNOPSIS" | |
5 .PP | |
6 \fB#include "SDL\&.h" | |
7 #include "SDL_thread\&.h" | |
8 .sp | |
9 \fBSDL_sem *\fBSDL_CreateSemaphore\fP\fR(\fBUint32 initial_value\fR); | |
10 .SH "DESCRIPTION" | |
11 .PP | |
12 \fBSDL_CreateSemaphore()\fP creates a new semaphore and initializes it with the value \fBinitial_value\fR\&. Each locking operation on the semaphore by \fISDL_SemWait\fR, \fISDL_SemTryWait\fR or \fISDL_SemWaitTimeout\fR will atomically decrement the semaphore value\&. The locking operation will be blocked if the semaphore value is not positive (greater than zero)\&. Each unlock operation by \fISDL_SemPost\fR will atomically increment the semaphore value\&. | |
13 .SH "RETURN VALUE" | |
14 .PP | |
15 Returns a pointer to an initialized semaphore or \fBNULL\fR if there was an error\&. | |
16 .SH "EXAMPLES" | |
17 .PP | |
18 .PP | |
19 .nf | |
20 \f(CWSDL_sem *my_sem; | |
21 | |
22 my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE); | |
23 | |
24 if (my_sem == NULL) { | |
25 return CREATE_SEM_FAILED; | |
26 }\fR | |
27 .fi | |
28 .PP | |
29 .SH "SEE ALSO" | |
30 .PP | |
31 \fI\fBSDL_DestroySemaphore\fP\fR, \fI\fBSDL_SemWait\fP\fR, \fI\fBSDL_SemTryWait\fP\fR, \fI\fBSDL_SemWaitTimeout\fP\fR, \fI\fBSDL_SemPost\fP\fR, \fI\fBSDL_SemValue\fP\fR | |
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
32 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00 |