Mercurial > sdl-ios-xcode
annotate src/thread/linux/SDL_syscond.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 | |
|
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Updated copyright information for 2004 (Happy New Year!)
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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 | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #ifdef linux | |
| 29 /* Look to see if glibc is available, and if so, what version */ | |
| 30 #include <features.h> | |
| 31 | |
| 32 #if (__GLIBC__ == 2) && (__GLIBC_MINOR__ == 0) | |
| 33 #warning Working around a bug in glibc 2.0 pthreads | |
| 34 #undef SDL_USE_PTHREADS | |
| 35 /* The bug is actually a problem where threads are suspended, but don't | |
| 36 wake up when the thread manager sends them a signal. This is a problem | |
| 37 with thread creation too, but it happens less often. :-/ | |
| 38 We avoid this by using System V IPC for mutexes. | |
| 39 */ | |
| 40 #endif /* glibc 2.0 */ | |
| 41 #endif /* linux */ | |
| 42 | |
| 43 #ifdef SDL_USE_PTHREADS | |
| 44 | |
| 45 #include <sys/time.h> | |
| 46 #include <unistd.h> | |
| 47 #include <errno.h> | |
| 48 #include <stdlib.h> | |
| 49 #include <pthread.h> | |
| 50 | |
| 51 #include "SDL_error.h" | |
| 52 #include "SDL_thread.h" | |
| 53 #include "SDL_sysmutex_c.h" | |
| 54 | |
| 55 | |
| 56 #if defined(PTHREAD_NO_RECURSIVE_MUTEX) && !defined(__bsdi__) | |
| 57 #error You need to use the generic condition variable implementation | |
| 58 #endif | |
| 59 | |
| 60 struct SDL_cond | |
| 61 { | |
| 62 pthread_cond_t cond; | |
| 63 }; | |
| 64 | |
| 65 /* Create a condition variable */ | |
| 66 SDL_cond * SDL_CreateCond(void) | |
| 67 { | |
| 68 SDL_cond *cond; | |
| 69 | |
| 70 cond = (SDL_cond *) malloc(sizeof(SDL_cond)); | |
| 71 if ( cond ) { | |
| 72 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) { | |
| 73 SDL_SetError("pthread_cond_init() failed"); | |
| 74 free(cond); | |
| 75 cond = NULL; | |
| 76 } | |
| 77 } | |
| 78 return(cond); | |
| 79 } | |
| 80 | |
| 81 /* Destroy a condition variable */ | |
| 82 void SDL_DestroyCond(SDL_cond *cond) | |
| 83 { | |
| 84 if ( cond ) { | |
| 85 pthread_cond_destroy(&cond->cond); | |
| 86 free(cond); | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 /* Restart one of the threads that are waiting on the condition variable */ | |
| 91 int SDL_CondSignal(SDL_cond *cond) | |
| 92 { | |
| 93 int retval; | |
| 94 | |
| 95 if ( ! cond ) { | |
| 96 SDL_SetError("Passed a NULL condition variable"); | |
| 97 return -1; | |
| 98 } | |
| 99 | |
| 100 retval = 0; | |
| 101 if ( pthread_cond_signal(&cond->cond) != 0 ) { | |
| 102 SDL_SetError("pthread_cond_signal() failed"); | |
| 103 retval = -1; | |
| 104 } | |
| 105 return retval; | |
| 106 } | |
| 107 | |
| 108 /* Restart all threads that are waiting on the condition variable */ | |
| 109 int SDL_CondBroadcast(SDL_cond *cond) | |
| 110 { | |
| 111 int retval; | |
| 112 | |
| 113 if ( ! cond ) { | |
| 114 SDL_SetError("Passed a NULL condition variable"); | |
| 115 return -1; | |
| 116 } | |
| 117 | |
| 118 retval = 0; | |
| 119 if ( pthread_cond_broadcast(&cond->cond) != 0 ) { | |
| 120 SDL_SetError("pthread_cond_broadcast() failed"); | |
| 121 retval = -1; | |
| 122 } | |
| 123 return retval; | |
| 124 } | |
| 125 | |
| 126 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms) | |
| 127 { | |
| 128 int retval; | |
| 129 struct timeval delta; | |
| 130 struct timespec abstime; | |
| 131 | |
| 132 if ( ! cond ) { | |
| 133 SDL_SetError("Passed a NULL condition variable"); | |
| 134 return -1; | |
| 135 } | |
| 136 | |
| 137 gettimeofday(&delta, NULL); | |
| 138 | |
| 139 abstime.tv_sec = delta.tv_sec + (ms/1000); | |
|
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140 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000; |
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141 if ( abstime.tv_nsec > 1000000000 ) { |
| 0 | 142 abstime.tv_sec += 1; |
|
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143 abstime.tv_nsec -= 1000000000; |
| 0 | 144 } |
| 145 | |
| 146 tryagain: | |
| 147 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime); | |
| 148 switch (retval) { | |
| 149 case EINTR: | |
| 150 goto tryagain; | |
| 151 break; | |
| 152 case ETIMEDOUT: | |
| 153 retval = SDL_MUTEX_TIMEDOUT; | |
| 154 break; | |
| 155 case 0: | |
| 156 break; | |
| 157 default: | |
| 158 SDL_SetError("pthread_cond_timedwait() failed"); | |
| 159 retval = -1; | |
| 160 break; | |
| 161 } | |
| 162 return retval; | |
| 163 } | |
| 164 | |
| 165 /* Wait on the condition variable, unlocking the provided mutex. | |
| 166 The mutex must be locked before entering this function! | |
| 167 */ | |
| 168 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex) | |
| 169 { | |
| 170 int retval; | |
| 171 | |
| 172 if ( ! cond ) { | |
| 173 SDL_SetError("Passed a NULL condition variable"); | |
| 174 return -1; | |
| 175 } | |
| 176 | |
| 177 retval = 0; | |
| 178 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) { | |
| 179 SDL_SetError("pthread_cond_wait() failed"); | |
| 180 retval = -1; | |
| 181 } | |
| 182 return retval; | |
| 183 } | |
| 184 | |
| 185 #else /* Use semaphore implementation */ | |
| 186 | |
| 187 #include "generic/SDL_syscond.c" | |
| 188 | |
| 189 #endif /* SDL_USE_PTHREADS */ |