Mercurial > sdl-ios-xcode
annotate src/events/SDL_events.c @ 4330:33570eec2d4f SDL-1.2
On recent distributions ALSA pipes streams through PulseAudio anyway, so using PulseAudio first when it's available will improve latency and reduce ALSA configuration quirks.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 13 Oct 2009 08:42:40 +0000 |
| parents | a1b03ba2fcd0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* General event handling code for SDL */ | |
| 25 | |
| 26 #include "SDL.h" | |
| 27 #include "SDL_syswm.h" | |
| 28 #include "SDL_sysevents.h" | |
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29 #include "SDL_events_c.h" |
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30 #include "../timer/SDL_timer_c.h" |
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31 #if !SDL_JOYSTICK_DISABLED |
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32 #include "../joystick/SDL_joystick_c.h" |
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33 #endif |
| 0 | 34 |
| 35 /* Public data -- the event filter */ | |
| 36 SDL_EventFilter SDL_EventOK = NULL; | |
| 37 Uint8 SDL_ProcessEvents[SDL_NUMEVENTS]; | |
| 38 static Uint32 SDL_eventstate = 0; | |
| 39 | |
| 40 /* Private data -- event queue */ | |
| 41 #define MAXEVENTS 128 | |
| 42 static struct { | |
| 43 SDL_mutex *lock; | |
| 44 int active; | |
| 45 int head; | |
| 46 int tail; | |
| 47 SDL_Event event[MAXEVENTS]; | |
| 48 int wmmsg_next; | |
| 49 struct SDL_SysWMmsg wmmsg[MAXEVENTS]; | |
| 50 } SDL_EventQ; | |
| 51 | |
| 52 /* Private data -- event locking structure */ | |
| 53 static struct { | |
| 54 SDL_mutex *lock; | |
| 55 int safe; | |
| 56 } SDL_EventLock; | |
| 57 | |
| 58 /* Thread functions */ | |
| 59 static SDL_Thread *SDL_EventThread = NULL; /* Thread handle */ | |
| 60 static Uint32 event_thread; /* The event thread id */ | |
| 61 | |
| 62 void SDL_Lock_EventThread(void) | |
| 63 { | |
| 64 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 65 /* Grab lock and spin until we're sure event thread stopped */ | |
| 66 SDL_mutexP(SDL_EventLock.lock); | |
| 67 while ( ! SDL_EventLock.safe ) { | |
| 68 SDL_Delay(1); | |
| 69 } | |
| 70 } | |
| 71 } | |
| 72 void SDL_Unlock_EventThread(void) | |
| 73 { | |
| 74 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 75 SDL_mutexV(SDL_EventLock.lock); | |
| 76 } | |
| 77 } | |
| 78 | |
| 1190 | 79 #ifdef __OS2__ |
| 80 /* | |
| 81 * We'll increase the priority of GobbleEvents thread, so it will process | |
| 82 * events in time for sure! For this, we need the DosSetPriority() API | |
| 83 * from the os2.h include file. | |
| 84 */ | |
| 85 #define INCL_DOSPROCESS | |
| 86 #include <os2.h> | |
| 87 #include <time.h> | |
| 88 #endif | |
| 89 | |
| 1769 | 90 static int SDLCALL SDL_GobbleEvents(void *unused) |
| 0 | 91 { |
| 92 event_thread = SDL_ThreadID(); | |
| 1190 | 93 |
| 94 #ifdef __OS2__ | |
| 95 #ifdef USE_DOSSETPRIORITY | |
| 96 /* Increase thread priority, so it will process events in time for sure! */ | |
| 97 DosSetPriority(PRTYS_THREAD, PRTYC_REGULAR, +16, 0); | |
| 98 #endif | |
| 99 #endif | |
| 100 | |
| 0 | 101 while ( SDL_EventQ.active ) { |
| 102 SDL_VideoDevice *video = current_video; | |
| 103 SDL_VideoDevice *this = current_video; | |
| 104 | |
| 105 /* Get events from the video subsystem */ | |
| 106 if ( video ) { | |
| 107 video->PumpEvents(this); | |
| 108 } | |
| 109 | |
| 110 /* Queue pending key-repeat events */ | |
| 111 SDL_CheckKeyRepeat(); | |
| 112 | |
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113 #if !SDL_JOYSTICK_DISABLED |
| 0 | 114 /* Check for joystick state change */ |
| 115 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 116 SDL_JoystickUpdate(); | |
| 117 } | |
| 118 #endif | |
| 119 | |
| 120 /* Give up the CPU for the rest of our timeslice */ | |
| 121 SDL_EventLock.safe = 1; | |
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122 if ( SDL_timer_running ) { |
| 0 | 123 SDL_ThreadedTimerCheck(); |
| 124 } | |
| 125 SDL_Delay(1); | |
| 126 | |
| 127 /* Check for event locking. | |
| 128 On the P of the lock mutex, if the lock is held, this thread | |
| 129 will wait until the lock is released before continuing. The | |
| 130 safe flag will be set, meaning that the other thread can go | |
| 131 about it's business. The safe flag is reset before the V, | |
| 132 so as soon as the mutex is free, other threads can see that | |
| 133 it's not safe to interfere with the event thread. | |
| 134 */ | |
| 135 SDL_mutexP(SDL_EventLock.lock); | |
| 136 SDL_EventLock.safe = 0; | |
| 137 SDL_mutexV(SDL_EventLock.lock); | |
| 138 } | |
| 139 SDL_SetTimerThreaded(0); | |
| 140 event_thread = 0; | |
| 141 return(0); | |
| 142 } | |
| 143 | |
| 144 static int SDL_StartEventThread(Uint32 flags) | |
| 145 { | |
| 146 /* Reset everything to zero */ | |
| 147 SDL_EventThread = NULL; | |
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148 SDL_memset(&SDL_EventLock, 0, sizeof(SDL_EventLock)); |
| 0 | 149 |
| 150 /* Create the lock and set ourselves active */ | |
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151 #if !SDL_THREADS_DISABLED |
| 0 | 152 SDL_EventQ.lock = SDL_CreateMutex(); |
| 153 if ( SDL_EventQ.lock == NULL ) { | |
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154 #ifdef __MACOS__ /* MacOS classic you can't multithread, so no lock needed */ |
| 0 | 155 ; |
| 156 #else | |
| 157 return(-1); | |
| 158 #endif | |
| 159 } | |
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160 #endif /* !SDL_THREADS_DISABLED */ |
| 0 | 161 SDL_EventQ.active = 1; |
| 162 | |
| 163 if ( (flags&SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) { | |
| 164 SDL_EventLock.lock = SDL_CreateMutex(); | |
| 165 if ( SDL_EventLock.lock == NULL ) { | |
| 166 return(-1); | |
| 167 } | |
| 168 SDL_EventLock.safe = 0; | |
| 169 | |
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170 /* The event thread will handle timers too */ |
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171 SDL_SetTimerThreaded(2); |
| 3975 | 172 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) && !defined(__SYMBIAN32__) |
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173 #undef SDL_CreateThread |
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174 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL, NULL, NULL); |
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175 #else |
| 0 | 176 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL); |
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177 #endif |
| 0 | 178 if ( SDL_EventThread == NULL ) { |
| 179 return(-1); | |
| 180 } | |
| 181 } else { | |
| 182 event_thread = 0; | |
| 183 } | |
| 184 return(0); | |
| 185 } | |
| 186 | |
| 187 static void SDL_StopEventThread(void) | |
| 188 { | |
| 189 SDL_EventQ.active = 0; | |
| 190 if ( SDL_EventThread ) { | |
| 191 SDL_WaitThread(SDL_EventThread, NULL); | |
| 192 SDL_EventThread = NULL; | |
| 193 SDL_DestroyMutex(SDL_EventLock.lock); | |
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194 SDL_EventLock.lock = NULL; |
| 0 | 195 } |
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196 #ifndef IPOD |
| 0 | 197 SDL_DestroyMutex(SDL_EventQ.lock); |
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198 SDL_EventQ.lock = NULL; |
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199 #endif |
| 0 | 200 } |
| 201 | |
| 202 Uint32 SDL_EventThreadID(void) | |
| 203 { | |
| 204 return(event_thread); | |
| 205 } | |
| 206 | |
| 207 /* Public functions */ | |
| 208 | |
| 209 void SDL_StopEventLoop(void) | |
| 210 { | |
| 211 /* Halt the event thread, if running */ | |
| 212 SDL_StopEventThread(); | |
| 213 | |
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214 /* Shutdown event handlers */ |
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215 SDL_AppActiveQuit(); |
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216 SDL_KeyboardQuit(); |
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217 SDL_MouseQuit(); |
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218 SDL_QuitQuit(); |
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219 |
| 0 | 220 /* Clean out EventQ */ |
| 221 SDL_EventQ.head = 0; | |
| 222 SDL_EventQ.tail = 0; | |
| 223 SDL_EventQ.wmmsg_next = 0; | |
| 224 } | |
| 225 | |
| 226 /* This function (and associated calls) may be called more than once */ | |
| 227 int SDL_StartEventLoop(Uint32 flags) | |
| 228 { | |
| 229 int retcode; | |
| 230 | |
| 231 /* Clean out the event queue */ | |
| 232 SDL_EventThread = NULL; | |
| 233 SDL_EventQ.lock = NULL; | |
| 234 SDL_StopEventLoop(); | |
| 235 | |
| 236 /* No filter to start with, process most event types */ | |
| 237 SDL_EventOK = NULL; | |
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238 SDL_memset(SDL_ProcessEvents,SDL_ENABLE,sizeof(SDL_ProcessEvents)); |
| 0 | 239 SDL_eventstate = ~0; |
| 240 /* It's not save to call SDL_EventState() yet */ | |
| 241 SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT); | |
| 242 SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE; | |
| 243 | |
| 244 /* Initialize event handlers */ | |
| 245 retcode = 0; | |
| 246 retcode += SDL_AppActiveInit(); | |
| 247 retcode += SDL_KeyboardInit(); | |
| 248 retcode += SDL_MouseInit(); | |
| 249 retcode += SDL_QuitInit(); | |
| 250 if ( retcode < 0 ) { | |
| 251 /* We don't expect them to fail, but... */ | |
| 252 return(-1); | |
| 253 } | |
| 254 | |
| 255 /* Create the lock and event thread */ | |
| 256 if ( SDL_StartEventThread(flags) < 0 ) { | |
| 257 SDL_StopEventLoop(); | |
| 258 return(-1); | |
| 259 } | |
| 260 return(0); | |
| 261 } | |
| 262 | |
| 263 | |
| 264 /* Add an event to the event queue -- called with the queue locked */ | |
| 265 static int SDL_AddEvent(SDL_Event *event) | |
| 266 { | |
| 267 int tail, added; | |
| 268 | |
| 269 tail = (SDL_EventQ.tail+1)%MAXEVENTS; | |
| 270 if ( tail == SDL_EventQ.head ) { | |
| 271 /* Overflow, drop event */ | |
| 272 added = 0; | |
| 273 } else { | |
| 274 SDL_EventQ.event[SDL_EventQ.tail] = *event; | |
| 275 if (event->type == SDL_SYSWMEVENT) { | |
| 276 /* Note that it's possible to lose an event */ | |
| 277 int next = SDL_EventQ.wmmsg_next; | |
| 278 SDL_EventQ.wmmsg[next] = *event->syswm.msg; | |
| 279 SDL_EventQ.event[SDL_EventQ.tail].syswm.msg = | |
| 280 &SDL_EventQ.wmmsg[next]; | |
| 281 SDL_EventQ.wmmsg_next = (next+1)%MAXEVENTS; | |
| 282 } | |
| 283 SDL_EventQ.tail = tail; | |
| 284 added = 1; | |
| 285 } | |
| 286 return(added); | |
| 287 } | |
| 288 | |
| 289 /* Cut an event, and return the next valid spot, or the tail */ | |
| 290 /* -- called with the queue locked */ | |
| 291 static int SDL_CutEvent(int spot) | |
| 292 { | |
| 293 if ( spot == SDL_EventQ.head ) { | |
| 294 SDL_EventQ.head = (SDL_EventQ.head+1)%MAXEVENTS; | |
| 295 return(SDL_EventQ.head); | |
| 296 } else | |
| 297 if ( (spot+1)%MAXEVENTS == SDL_EventQ.tail ) { | |
| 298 SDL_EventQ.tail = spot; | |
| 299 return(SDL_EventQ.tail); | |
| 300 } else | |
| 301 /* We cut the middle -- shift everything over */ | |
| 302 { | |
| 303 int here, next; | |
| 304 | |
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305 /* This can probably be optimized with SDL_memcpy() -- careful! */ |
| 0 | 306 if ( --SDL_EventQ.tail < 0 ) { |
| 307 SDL_EventQ.tail = MAXEVENTS-1; | |
| 308 } | |
| 309 for ( here=spot; here != SDL_EventQ.tail; here = next ) { | |
| 310 next = (here+1)%MAXEVENTS; | |
| 311 SDL_EventQ.event[here] = SDL_EventQ.event[next]; | |
| 312 } | |
| 313 return(spot); | |
| 314 } | |
| 315 /* NOTREACHED */ | |
| 316 } | |
| 317 | |
| 318 /* Lock the event queue, take a peep at it, and unlock it */ | |
| 319 int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action, | |
| 320 Uint32 mask) | |
| 321 { | |
| 322 int i, used; | |
| 323 | |
| 324 /* Don't look after we've quit */ | |
| 325 if ( ! SDL_EventQ.active ) { | |
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326 return(-1); |
| 0 | 327 } |
| 328 /* Lock the event queue */ | |
| 329 used = 0; | |
| 330 if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) { | |
| 331 if ( action == SDL_ADDEVENT ) { | |
| 332 for ( i=0; i<numevents; ++i ) { | |
| 333 used += SDL_AddEvent(&events[i]); | |
| 334 } | |
| 335 } else { | |
| 336 SDL_Event tmpevent; | |
| 337 int spot; | |
| 338 | |
| 339 /* If 'events' is NULL, just see if they exist */ | |
| 340 if ( events == NULL ) { | |
| 341 action = SDL_PEEKEVENT; | |
| 342 numevents = 1; | |
| 343 events = &tmpevent; | |
| 344 } | |
| 345 spot = SDL_EventQ.head; | |
| 346 while ((used < numevents)&&(spot != SDL_EventQ.tail)) { | |
| 347 if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) { | |
| 348 events[used++] = SDL_EventQ.event[spot]; | |
| 349 if ( action == SDL_GETEVENT ) { | |
| 350 spot = SDL_CutEvent(spot); | |
| 351 } else { | |
| 352 spot = (spot+1)%MAXEVENTS; | |
| 353 } | |
| 354 } else { | |
| 355 spot = (spot+1)%MAXEVENTS; | |
| 356 } | |
| 357 } | |
| 358 } | |
| 359 SDL_mutexV(SDL_EventQ.lock); | |
| 360 } else { | |
| 361 SDL_SetError("Couldn't lock event queue"); | |
| 362 used = -1; | |
| 363 } | |
| 364 return(used); | |
| 365 } | |
| 366 | |
| 367 /* Run the system dependent event loops */ | |
| 368 void SDL_PumpEvents(void) | |
| 369 { | |
| 370 if ( !SDL_EventThread ) { | |
| 371 SDL_VideoDevice *video = current_video; | |
| 372 SDL_VideoDevice *this = current_video; | |
| 373 | |
| 374 /* Get events from the video subsystem */ | |
| 375 if ( video ) { | |
| 376 video->PumpEvents(this); | |
| 377 } | |
| 378 | |
| 379 /* Queue pending key-repeat events */ | |
| 380 SDL_CheckKeyRepeat(); | |
| 381 | |
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382 #if !SDL_JOYSTICK_DISABLED |
| 0 | 383 /* Check for joystick state change */ |
| 384 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 385 SDL_JoystickUpdate(); | |
| 386 } | |
| 387 #endif | |
| 388 } | |
| 389 } | |
| 390 | |
| 391 /* Public functions */ | |
| 392 | |
| 393 int SDL_PollEvent (SDL_Event *event) | |
| 394 { | |
| 395 SDL_PumpEvents(); | |
| 396 | |
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397 /* We can't return -1, just return 0 (no event) on error */ |
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398 if ( SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0 ) |
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399 return 0; |
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400 return 1; |
| 0 | 401 } |
| 402 | |
| 403 int SDL_WaitEvent (SDL_Event *event) | |
| 404 { | |
| 405 while ( 1 ) { | |
| 406 SDL_PumpEvents(); | |
| 407 switch(SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) { | |
|
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408 case -1: return 0; |
| 0 | 409 case 1: return 1; |
| 410 case 0: SDL_Delay(10); | |
| 411 } | |
| 412 } | |
| 413 } | |
| 414 | |
| 415 int SDL_PushEvent(SDL_Event *event) | |
| 416 { | |
| 384 | 417 if ( SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0 ) |
| 418 return -1; | |
| 419 return 0; | |
| 0 | 420 } |
| 421 | |
| 422 void SDL_SetEventFilter (SDL_EventFilter filter) | |
| 423 { | |
| 424 SDL_Event bitbucket; | |
| 425 | |
| 426 /* Set filter and discard pending events */ | |
| 427 SDL_EventOK = filter; | |
| 428 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 429 ; | |
| 430 } | |
| 431 | |
| 432 SDL_EventFilter SDL_GetEventFilter(void) | |
| 433 { | |
| 434 return(SDL_EventOK); | |
| 435 } | |
| 436 | |
| 437 Uint8 SDL_EventState (Uint8 type, int state) | |
| 438 { | |
| 439 SDL_Event bitbucket; | |
| 440 Uint8 current_state; | |
| 441 | |
| 442 /* If SDL_ALLEVENTS was specified... */ | |
| 443 if ( type == 0xFF ) { | |
| 444 current_state = SDL_IGNORE; | |
| 445 for ( type=0; type<SDL_NUMEVENTS; ++type ) { | |
| 446 if ( SDL_ProcessEvents[type] != SDL_IGNORE ) { | |
| 447 current_state = SDL_ENABLE; | |
| 448 } | |
| 449 SDL_ProcessEvents[type] = state; | |
| 450 if ( state == SDL_ENABLE ) { | |
| 451 SDL_eventstate |= (0x00000001 << (type)); | |
| 452 } else { | |
| 453 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 454 } | |
| 455 } | |
| 456 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 457 ; | |
| 458 return(current_state); | |
| 459 } | |
| 460 | |
| 461 /* Just set the state for one event type */ | |
| 462 current_state = SDL_ProcessEvents[type]; | |
| 463 switch (state) { | |
| 464 case SDL_IGNORE: | |
| 465 case SDL_ENABLE: | |
| 466 /* Set state and discard pending events */ | |
| 467 SDL_ProcessEvents[type] = state; | |
| 468 if ( state == SDL_ENABLE ) { | |
| 469 SDL_eventstate |= (0x00000001 << (type)); | |
| 470 } else { | |
| 471 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 472 } | |
| 473 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 474 ; | |
| 475 break; | |
| 476 default: | |
| 477 /* Querying state? */ | |
| 478 break; | |
| 479 } | |
| 480 return(current_state); | |
| 481 } | |
| 482 | |
| 483 /* This is a generic event handler. | |
| 484 */ | |
| 485 int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message) | |
| 486 { | |
| 487 int posted; | |
| 488 | |
| 489 posted = 0; | |
| 490 if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) { | |
| 491 SDL_Event event; | |
|
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parents:
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changeset
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492 SDL_memset(&event, 0, sizeof(event)); |
| 0 | 493 event.type = SDL_SYSWMEVENT; |
| 494 event.syswm.msg = message; | |
| 495 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 496 posted = 1; | |
| 497 SDL_PushEvent(&event); | |
| 498 } | |
| 499 } | |
| 500 /* Update internal event state */ | |
| 501 return(posted); | |
| 502 } |