Mercurial > sdl-ios-xcode
annotate include/SDL_mutex.h @ 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 | 3bdcef7e1c90 |
| children | c9b51268668f |
| rev | line source |
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| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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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 #ifndef _SDL_mutex_h | |
| 29 #define _SDL_mutex_h | |
| 30 | |
| 31 /* Functions to provide thread synchronization primitives | |
| 32 | |
| 33 These are independent of the other SDL routines. | |
| 34 */ | |
| 35 | |
| 36 #include "SDL_main.h" | |
| 37 #include "SDL_types.h" | |
| 38 | |
| 39 #include "begin_code.h" | |
| 40 /* Set up for C function definitions, even when using C++ */ | |
| 41 #ifdef __cplusplus | |
| 42 extern "C" { | |
| 43 #endif | |
| 44 | |
| 45 /* Synchronization functions which can time out return this value | |
| 46 if they time out. | |
| 47 */ | |
| 48 #define SDL_MUTEX_TIMEDOUT 1 | |
| 49 | |
| 50 /* This is the timeout value which corresponds to never time out */ | |
| 51 #define SDL_MUTEX_MAXWAIT (~(Uint32)0) | |
| 52 | |
| 53 | |
| 54 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 55 /* Mutex functions */ | |
| 56 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 57 | |
| 58 /* The SDL mutex structure, defined in SDL_mutex.c */ | |
| 59 struct SDL_mutex; | |
| 60 typedef struct SDL_mutex SDL_mutex; | |
| 61 | |
| 62 /* Create a mutex, initialized unlocked */ | |
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63 extern DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void); |
| 0 | 64 |
| 65 /* Lock the mutex (Returns 0, or -1 on error) */ | |
| 66 #define SDL_LockMutex(m) SDL_mutexP(m) | |
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67 extern DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex); |
| 0 | 68 |
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69 /* Unlock the mutex (Returns 0, or -1 on error) |
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70 It is an error to unlock a mutex that has not been locked by |
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71 the current thread, and doing so results in undefined behavior. |
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72 */ |
| 0 | 73 #define SDL_UnlockMutex(m) SDL_mutexV(m) |
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74 extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex); |
| 0 | 75 |
| 76 /* Destroy a mutex */ | |
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77 extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex); |
| 0 | 78 |
| 79 | |
| 80 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 81 /* Semaphore functions */ | |
| 82 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 83 | |
| 84 /* The SDL semaphore structure, defined in SDL_sem.c */ | |
| 85 struct SDL_semaphore; | |
| 86 typedef struct SDL_semaphore SDL_sem; | |
| 87 | |
| 88 /* Create a semaphore, initialized with value, returns NULL on failure. */ | |
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89 extern DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value); |
| 0 | 90 |
| 91 /* Destroy a semaphore */ | |
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92 extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem); |
| 0 | 93 |
| 94 /* This function suspends the calling thread until the semaphore pointed | |
| 95 * to by sem has a positive count. It then atomically decreases the semaphore | |
| 96 * count. | |
| 97 */ | |
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98 extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem); |
| 0 | 99 |
| 100 /* Non-blocking variant of SDL_SemWait(), returns 0 if the wait succeeds, | |
| 101 SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error. | |
| 102 */ | |
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103 extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem); |
| 0 | 104 |
| 105 /* Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if | |
| 106 the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in | |
| 107 the allotted time, and -1 on error. | |
| 108 On some platforms this function is implemented by looping with a delay | |
| 109 of 1 ms, and so should be avoided if possible. | |
| 110 */ | |
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111 extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms); |
| 0 | 112 |
| 113 /* Atomically increases the semaphore's count (not blocking), returns 0, | |
| 114 or -1 on error. | |
| 115 */ | |
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116 extern DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem); |
| 0 | 117 |
| 118 /* Returns the current count of the semaphore */ | |
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119 extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem); |
| 0 | 120 |
| 121 | |
| 122 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 123 /* Condition variable functions */ | |
| 124 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 125 | |
| 126 /* The SDL condition variable structure, defined in SDL_cond.c */ | |
| 127 struct SDL_cond; | |
| 128 typedef struct SDL_cond SDL_cond; | |
| 129 | |
| 130 /* Create a condition variable */ | |
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131 extern DECLSPEC SDL_cond * SDLCALL SDL_CreateCond(void); |
| 0 | 132 |
| 133 /* Destroy a condition variable */ | |
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134 extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond); |
| 0 | 135 |
| 136 /* Restart one of the threads that are waiting on the condition variable, | |
| 137 returns 0 or -1 on error. | |
| 138 */ | |
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139 extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond); |
| 0 | 140 |
| 141 /* Restart all threads that are waiting on the condition variable, | |
| 142 returns 0 or -1 on error. | |
| 143 */ | |
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144 extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond *cond); |
| 0 | 145 |
| 146 /* Wait on the condition variable, unlocking the provided mutex. | |
| 147 The mutex must be locked before entering this function! | |
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148 The mutex is re-locked once the condition variable is signaled. |
| 0 | 149 Returns 0 when it is signaled, or -1 on error. |
| 150 */ | |
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151 extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mut); |
| 0 | 152 |
| 153 /* Waits for at most 'ms' milliseconds, and returns 0 if the condition | |
| 154 variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not | |
| 155 signaled in the allotted time, and -1 on error. | |
| 156 On some platforms this function is implemented by looping with a delay | |
| 157 of 1 ms, and so should be avoided if possible. | |
| 158 */ | |
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159 extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms); |
| 0 | 160 |
| 161 /* Ends C function definitions when using C++ */ | |
| 162 #ifdef __cplusplus | |
| 163 } | |
| 164 #endif | |
| 165 #include "close_code.h" | |
| 166 | |
| 167 #endif /* _SDL_mutex_h */ |