Mercurial > sdl-ios-xcode
annotate src/thread/win32/SDL_sysmutex.c @ 1295:c3e36ac8a94c
Date: Sun, 6 Mar 2005 17:06:20 +0100
From: Per Inge Mathisen
Subject: [SDL] Fullscreen refresh on win32
Windows has a terrible default for fullscreen 3D apps of 60mhz refresh
rate. This can be fixed by the user by going into his driver's
control panel and forcing the refresh rate higher. However, this not a
very user friendly way about it, and in any case SDL contains no code
that could figure out this that condition has afflicted the user.
So the question is, could SDL fix this for the user? It is possible
under Windows to request a higher refresh rate. The danger is of
course that if the user has an old monitor, and you request a too high
refresh rate, the monitor could be damaged. However, I believe there
might be a way around that: Check before switching what refresh rate
the user's desktop runs in, and if our fullscreen dimensions are equal
or less than those of the desktop, use the higher refresh rate of 60
and the desktop rate.
Since most users run their desktops in the same or higher resolution
something sane, this should fix this problem for most users.
Thoughts?
An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE)
option so that programs can bitch at their users at their own
convenience.
- Per
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 30 Jan 2006 06:56:10 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
769
b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Mutex functions using the Win32 API */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <windows.h> | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_mutex.h" | |
| 36 | |
| 37 | |
| 38 struct SDL_mutex { | |
| 39 HANDLE id; | |
| 40 }; | |
| 41 | |
| 42 /* Create a mutex */ | |
| 43 SDL_mutex *SDL_CreateMutex(void) | |
| 44 { | |
| 45 SDL_mutex *mutex; | |
| 46 | |
| 47 /* Allocate mutex memory */ | |
| 48 mutex = (SDL_mutex *)malloc(sizeof(*mutex)); | |
| 49 if ( mutex ) { | |
| 50 /* Create the mutex, with initial value signaled */ | |
| 51 mutex->id = CreateMutex(NULL, FALSE, NULL); | |
| 52 if ( ! mutex->id ) { | |
| 53 SDL_SetError("Couldn't create mutex"); | |
| 54 free(mutex); | |
| 55 mutex = NULL; | |
| 56 } | |
| 57 } else { | |
| 58 SDL_OutOfMemory(); | |
| 59 } | |
| 60 return(mutex); | |
| 61 } | |
| 62 | |
| 63 /* Free the mutex */ | |
| 64 void SDL_DestroyMutex(SDL_mutex *mutex) | |
| 65 { | |
| 66 if ( mutex ) { | |
| 67 if ( mutex->id ) { | |
| 68 CloseHandle(mutex->id); | |
| 69 mutex->id = 0; | |
| 70 } | |
| 71 free(mutex); | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 /* Lock the mutex */ | |
| 76 int SDL_mutexP(SDL_mutex *mutex) | |
| 77 { | |
| 78 if ( mutex == NULL ) { | |
| 79 SDL_SetError("Passed a NULL mutex"); | |
| 80 return -1; | |
| 81 } | |
| 82 if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) { | |
| 83 SDL_SetError("Couldn't wait on mutex"); | |
| 84 return -1; | |
| 85 } | |
| 86 return(0); | |
| 87 } | |
| 88 | |
| 89 /* Unlock the mutex */ | |
| 90 int SDL_mutexV(SDL_mutex *mutex) | |
| 91 { | |
| 92 if ( mutex == NULL ) { | |
| 93 SDL_SetError("Passed a NULL mutex"); | |
| 94 return -1; | |
| 95 } | |
| 96 if ( ReleaseMutex(mutex->id) == FALSE ) { | |
| 97 SDL_SetError("Couldn't release mutex"); | |
| 98 return -1; | |
| 99 } | |
| 100 return(0); | |
| 101 } |