Mercurial > sdl-ios-xcode
annotate src/events/SDL_events.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | 173c063d4f55 |
| children | 450721ad5436 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
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Updated copyright information and removed rcs id lines (problematic in branch merges)
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3 Copyright (C) 1997-2006 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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parents:
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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 */ |
| 22 | |
| 23 /* General event handling code for SDL */ | |
| 24 | |
| 25 #include <stdio.h> | |
| 26 #include <string.h> | |
| 27 | |
| 28 #include "SDL.h" | |
| 29 #include "SDL_thread.h" | |
| 30 #include "SDL_mutex.h" | |
| 31 #include "SDL_events.h" | |
| 32 #include "SDL_events_c.h" | |
| 33 #include "SDL_timer_c.h" | |
| 34 #ifndef DISABLE_JOYSTICK | |
| 35 #include "SDL_joystick_c.h" | |
| 36 #endif | |
| 37 #ifndef ENABLE_X11 | |
| 38 #define DISABLE_X11 | |
| 39 #endif | |
| 40 #include "SDL_syswm.h" | |
| 41 #include "SDL_sysevents.h" | |
| 42 | |
| 43 /* Public data -- the event filter */ | |
| 44 SDL_EventFilter SDL_EventOK = NULL; | |
| 45 Uint8 SDL_ProcessEvents[SDL_NUMEVENTS]; | |
| 46 static Uint32 SDL_eventstate = 0; | |
| 47 | |
| 48 /* Private data -- event queue */ | |
| 49 #define MAXEVENTS 128 | |
| 50 static struct { | |
| 51 SDL_mutex *lock; | |
| 52 int active; | |
| 53 int head; | |
| 54 int tail; | |
| 55 SDL_Event event[MAXEVENTS]; | |
| 56 int wmmsg_next; | |
| 57 struct SDL_SysWMmsg wmmsg[MAXEVENTS]; | |
| 58 } SDL_EventQ; | |
| 59 | |
| 60 /* Private data -- event locking structure */ | |
| 61 static struct { | |
| 62 SDL_mutex *lock; | |
| 63 int safe; | |
| 64 } SDL_EventLock; | |
| 65 | |
| 66 /* Thread functions */ | |
| 67 static SDL_Thread *SDL_EventThread = NULL; /* Thread handle */ | |
| 68 static Uint32 event_thread; /* The event thread id */ | |
| 69 | |
| 70 void SDL_Lock_EventThread(void) | |
| 71 { | |
| 72 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 73 /* Grab lock and spin until we're sure event thread stopped */ | |
| 74 SDL_mutexP(SDL_EventLock.lock); | |
| 75 while ( ! SDL_EventLock.safe ) { | |
| 76 SDL_Delay(1); | |
| 77 } | |
| 78 } | |
| 79 } | |
| 80 void SDL_Unlock_EventThread(void) | |
| 81 { | |
| 82 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 83 SDL_mutexV(SDL_EventLock.lock); | |
| 84 } | |
| 85 } | |
| 86 | |
| 1190 | 87 #ifdef __OS2__ |
| 88 /* | |
| 89 * We'll increase the priority of GobbleEvents thread, so it will process | |
| 90 * events in time for sure! For this, we need the DosSetPriority() API | |
| 91 * from the os2.h include file. | |
| 92 */ | |
| 93 #define INCL_DOSPROCESS | |
| 94 #include <os2.h> | |
| 95 #include <time.h> | |
| 96 #endif | |
| 97 | |
| 0 | 98 static int SDL_GobbleEvents(void *unused) |
| 99 { | |
| 100 event_thread = SDL_ThreadID(); | |
| 1190 | 101 |
| 102 #ifdef __OS2__ | |
| 103 #ifdef USE_DOSSETPRIORITY | |
| 104 /* Increase thread priority, so it will process events in time for sure! */ | |
| 105 DosSetPriority(PRTYS_THREAD, PRTYC_REGULAR, +16, 0); | |
| 106 #endif | |
| 107 #endif | |
| 108 | |
| 0 | 109 while ( SDL_EventQ.active ) { |
| 110 SDL_VideoDevice *video = current_video; | |
| 111 SDL_VideoDevice *this = current_video; | |
| 112 | |
| 113 /* Get events from the video subsystem */ | |
| 114 if ( video ) { | |
| 115 video->PumpEvents(this); | |
| 116 } | |
| 117 | |
| 118 /* Queue pending key-repeat events */ | |
| 119 SDL_CheckKeyRepeat(); | |
| 120 | |
| 121 #ifndef DISABLE_JOYSTICK | |
| 122 /* Check for joystick state change */ | |
| 123 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 124 SDL_JoystickUpdate(); | |
| 125 } | |
| 126 #endif | |
| 127 | |
| 128 /* Give up the CPU for the rest of our timeslice */ | |
| 129 SDL_EventLock.safe = 1; | |
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130 if ( SDL_timer_running ) { |
| 0 | 131 SDL_ThreadedTimerCheck(); |
| 132 } | |
| 133 SDL_Delay(1); | |
| 134 | |
| 135 /* Check for event locking. | |
| 136 On the P of the lock mutex, if the lock is held, this thread | |
| 137 will wait until the lock is released before continuing. The | |
| 138 safe flag will be set, meaning that the other thread can go | |
| 139 about it's business. The safe flag is reset before the V, | |
| 140 so as soon as the mutex is free, other threads can see that | |
| 141 it's not safe to interfere with the event thread. | |
| 142 */ | |
| 143 SDL_mutexP(SDL_EventLock.lock); | |
| 144 SDL_EventLock.safe = 0; | |
| 145 SDL_mutexV(SDL_EventLock.lock); | |
| 146 } | |
| 147 SDL_SetTimerThreaded(0); | |
| 148 event_thread = 0; | |
| 149 return(0); | |
| 150 } | |
| 151 | |
| 152 static int SDL_StartEventThread(Uint32 flags) | |
| 153 { | |
| 154 /* Reset everything to zero */ | |
| 155 SDL_EventThread = NULL; | |
| 156 memset(&SDL_EventLock, 0, sizeof(SDL_EventLock)); | |
| 157 | |
| 158 /* Create the lock and set ourselves active */ | |
| 159 #ifndef DISABLE_THREADS | |
| 160 SDL_EventQ.lock = SDL_CreateMutex(); | |
| 161 if ( SDL_EventQ.lock == NULL ) { | |
| 162 #ifdef macintosh /* On MacOS 7/8, you can't multithread, so no lock needed */ | |
| 163 ; | |
| 164 #else | |
| 165 return(-1); | |
| 166 #endif | |
| 167 } | |
| 168 #endif /* !DISABLE_THREADS */ | |
| 169 SDL_EventQ.active = 1; | |
| 170 | |
| 171 if ( (flags&SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) { | |
| 172 SDL_EventLock.lock = SDL_CreateMutex(); | |
| 173 if ( SDL_EventLock.lock == NULL ) { | |
| 174 return(-1); | |
| 175 } | |
| 176 SDL_EventLock.safe = 0; | |
| 177 | |
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178 /* The event thread will handle timers too */ |
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179 SDL_SetTimerThreaded(2); |
| 0 | 180 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL); |
| 181 if ( SDL_EventThread == NULL ) { | |
| 182 return(-1); | |
| 183 } | |
| 184 } else { | |
| 185 event_thread = 0; | |
| 186 } | |
| 187 return(0); | |
| 188 } | |
| 189 | |
| 190 static void SDL_StopEventThread(void) | |
| 191 { | |
| 192 SDL_EventQ.active = 0; | |
| 193 if ( SDL_EventThread ) { | |
| 194 SDL_WaitThread(SDL_EventThread, NULL); | |
| 195 SDL_EventThread = NULL; | |
| 196 SDL_DestroyMutex(SDL_EventLock.lock); | |
| 197 } | |
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198 #ifndef IPOD |
| 0 | 199 SDL_DestroyMutex(SDL_EventQ.lock); |
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200 #endif |
| 0 | 201 } |
| 202 | |
| 203 Uint32 SDL_EventThreadID(void) | |
| 204 { | |
| 205 return(event_thread); | |
| 206 } | |
| 207 | |
| 208 /* Public functions */ | |
| 209 | |
| 210 void SDL_StopEventLoop(void) | |
| 211 { | |
| 212 /* Halt the event thread, if running */ | |
| 213 SDL_StopEventThread(); | |
| 214 | |
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215 /* Shutdown event handlers */ |
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216 SDL_AppActiveQuit(); |
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217 SDL_KeyboardQuit(); |
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218 SDL_MouseQuit(); |
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219 SDL_QuitQuit(); |
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220 |
| 0 | 221 /* Clean out EventQ */ |
| 222 SDL_EventQ.head = 0; | |
| 223 SDL_EventQ.tail = 0; | |
| 224 SDL_EventQ.wmmsg_next = 0; | |
| 225 } | |
| 226 | |
| 227 /* This function (and associated calls) may be called more than once */ | |
| 228 int SDL_StartEventLoop(Uint32 flags) | |
| 229 { | |
| 230 int retcode; | |
| 231 | |
| 232 /* Clean out the event queue */ | |
| 233 SDL_EventThread = NULL; | |
| 234 SDL_EventQ.lock = NULL; | |
| 235 SDL_StopEventLoop(); | |
| 236 | |
| 237 /* No filter to start with, process most event types */ | |
| 238 SDL_EventOK = NULL; | |
| 239 memset(SDL_ProcessEvents,SDL_ENABLE,sizeof(SDL_ProcessEvents)); | |
| 240 SDL_eventstate = ~0; | |
| 241 /* It's not save to call SDL_EventState() yet */ | |
| 242 SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT); | |
| 243 SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE; | |
| 244 | |
| 245 /* Initialize event handlers */ | |
| 246 retcode = 0; | |
| 247 retcode += SDL_AppActiveInit(); | |
| 248 retcode += SDL_KeyboardInit(); | |
| 249 retcode += SDL_MouseInit(); | |
| 250 retcode += SDL_QuitInit(); | |
| 251 if ( retcode < 0 ) { | |
| 252 /* We don't expect them to fail, but... */ | |
| 253 return(-1); | |
| 254 } | |
| 255 | |
| 256 /* Create the lock and event thread */ | |
| 257 if ( SDL_StartEventThread(flags) < 0 ) { | |
| 258 SDL_StopEventLoop(); | |
| 259 return(-1); | |
| 260 } | |
| 261 return(0); | |
| 262 } | |
| 263 | |
| 264 | |
| 265 /* Add an event to the event queue -- called with the queue locked */ | |
| 266 static int SDL_AddEvent(SDL_Event *event) | |
| 267 { | |
| 268 int tail, added; | |
| 269 | |
| 270 tail = (SDL_EventQ.tail+1)%MAXEVENTS; | |
| 271 if ( tail == SDL_EventQ.head ) { | |
| 272 /* Overflow, drop event */ | |
| 273 added = 0; | |
| 274 } else { | |
| 275 SDL_EventQ.event[SDL_EventQ.tail] = *event; | |
| 276 if (event->type == SDL_SYSWMEVENT) { | |
| 277 /* Note that it's possible to lose an event */ | |
| 278 int next = SDL_EventQ.wmmsg_next; | |
| 279 SDL_EventQ.wmmsg[next] = *event->syswm.msg; | |
| 280 SDL_EventQ.event[SDL_EventQ.tail].syswm.msg = | |
| 281 &SDL_EventQ.wmmsg[next]; | |
| 282 SDL_EventQ.wmmsg_next = (next+1)%MAXEVENTS; | |
| 283 } | |
| 284 SDL_EventQ.tail = tail; | |
| 285 added = 1; | |
| 286 } | |
| 287 return(added); | |
| 288 } | |
| 289 | |
| 290 /* Cut an event, and return the next valid spot, or the tail */ | |
| 291 /* -- called with the queue locked */ | |
| 292 static int SDL_CutEvent(int spot) | |
| 293 { | |
| 294 if ( spot == SDL_EventQ.head ) { | |
| 295 SDL_EventQ.head = (SDL_EventQ.head+1)%MAXEVENTS; | |
| 296 return(SDL_EventQ.head); | |
| 297 } else | |
| 298 if ( (spot+1)%MAXEVENTS == SDL_EventQ.tail ) { | |
| 299 SDL_EventQ.tail = spot; | |
| 300 return(SDL_EventQ.tail); | |
| 301 } else | |
| 302 /* We cut the middle -- shift everything over */ | |
| 303 { | |
| 304 int here, next; | |
| 305 | |
| 306 /* This can probably be optimized with memcpy() -- careful! */ | |
| 307 if ( --SDL_EventQ.tail < 0 ) { | |
| 308 SDL_EventQ.tail = MAXEVENTS-1; | |
| 309 } | |
| 310 for ( here=spot; here != SDL_EventQ.tail; here = next ) { | |
| 311 next = (here+1)%MAXEVENTS; | |
| 312 SDL_EventQ.event[here] = SDL_EventQ.event[next]; | |
| 313 } | |
| 314 return(spot); | |
| 315 } | |
| 316 /* NOTREACHED */ | |
| 317 } | |
| 318 | |
| 319 /* Lock the event queue, take a peep at it, and unlock it */ | |
| 320 int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action, | |
| 321 Uint32 mask) | |
| 322 { | |
| 323 int i, used; | |
| 324 | |
| 325 /* Don't look after we've quit */ | |
| 326 if ( ! SDL_EventQ.active ) { | |
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327 return(-1); |
| 0 | 328 } |
| 329 /* Lock the event queue */ | |
| 330 used = 0; | |
| 331 if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) { | |
| 332 if ( action == SDL_ADDEVENT ) { | |
| 333 for ( i=0; i<numevents; ++i ) { | |
| 334 used += SDL_AddEvent(&events[i]); | |
| 335 } | |
| 336 } else { | |
| 337 SDL_Event tmpevent; | |
| 338 int spot; | |
| 339 | |
| 340 /* If 'events' is NULL, just see if they exist */ | |
| 341 if ( events == NULL ) { | |
| 342 action = SDL_PEEKEVENT; | |
| 343 numevents = 1; | |
| 344 events = &tmpevent; | |
| 345 } | |
| 346 spot = SDL_EventQ.head; | |
| 347 while ((used < numevents)&&(spot != SDL_EventQ.tail)) { | |
| 348 if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) { | |
| 349 events[used++] = SDL_EventQ.event[spot]; | |
| 350 if ( action == SDL_GETEVENT ) { | |
| 351 spot = SDL_CutEvent(spot); | |
| 352 } else { | |
| 353 spot = (spot+1)%MAXEVENTS; | |
| 354 } | |
| 355 } else { | |
| 356 spot = (spot+1)%MAXEVENTS; | |
| 357 } | |
| 358 } | |
| 359 } | |
| 360 SDL_mutexV(SDL_EventQ.lock); | |
| 361 } else { | |
| 362 SDL_SetError("Couldn't lock event queue"); | |
| 363 used = -1; | |
| 364 } | |
| 365 return(used); | |
| 366 } | |
| 367 | |
| 368 /* Run the system dependent event loops */ | |
| 369 void SDL_PumpEvents(void) | |
| 370 { | |
| 371 if ( !SDL_EventThread ) { | |
| 372 SDL_VideoDevice *video = current_video; | |
| 373 SDL_VideoDevice *this = current_video; | |
| 374 | |
| 375 /* Get events from the video subsystem */ | |
| 376 if ( video ) { | |
| 377 video->PumpEvents(this); | |
| 378 } | |
| 379 | |
| 380 /* Queue pending key-repeat events */ | |
| 381 SDL_CheckKeyRepeat(); | |
| 382 | |
| 383 #ifndef DISABLE_JOYSTICK | |
| 384 /* Check for joystick state change */ | |
| 385 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 386 SDL_JoystickUpdate(); | |
| 387 } | |
| 388 #endif | |
| 389 } | |
| 390 } | |
| 391 | |
| 392 /* Public functions */ | |
| 393 | |
| 394 int SDL_PollEvent (SDL_Event *event) | |
| 395 { | |
| 396 SDL_PumpEvents(); | |
| 397 | |
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398 /* We can't return -1, just return 0 (no event) on error */ |
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399 if ( SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0 ) |
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400 return 0; |
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401 return 1; |
| 0 | 402 } |
| 403 | |
| 404 int SDL_WaitEvent (SDL_Event *event) | |
| 405 { | |
| 406 while ( 1 ) { | |
| 407 SDL_PumpEvents(); | |
| 408 switch(SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) { | |
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409 case -1: return 0; |
| 0 | 410 case 1: return 1; |
| 411 case 0: SDL_Delay(10); | |
| 412 } | |
| 413 } | |
| 414 } | |
| 415 | |
| 416 int SDL_PushEvent(SDL_Event *event) | |
| 417 { | |
| 384 | 418 if ( SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0 ) |
| 419 return -1; | |
| 420 return 0; | |
| 0 | 421 } |
| 422 | |
| 423 void SDL_SetEventFilter (SDL_EventFilter filter) | |
| 424 { | |
| 425 SDL_Event bitbucket; | |
| 426 | |
| 427 /* Set filter and discard pending events */ | |
| 428 SDL_EventOK = filter; | |
| 429 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 430 ; | |
| 431 } | |
| 432 | |
| 433 SDL_EventFilter SDL_GetEventFilter(void) | |
| 434 { | |
| 435 return(SDL_EventOK); | |
| 436 } | |
| 437 | |
| 438 Uint8 SDL_EventState (Uint8 type, int state) | |
| 439 { | |
| 440 SDL_Event bitbucket; | |
| 441 Uint8 current_state; | |
| 442 | |
| 443 /* If SDL_ALLEVENTS was specified... */ | |
| 444 if ( type == 0xFF ) { | |
| 445 current_state = SDL_IGNORE; | |
| 446 for ( type=0; type<SDL_NUMEVENTS; ++type ) { | |
| 447 if ( SDL_ProcessEvents[type] != SDL_IGNORE ) { | |
| 448 current_state = SDL_ENABLE; | |
| 449 } | |
| 450 SDL_ProcessEvents[type] = state; | |
| 451 if ( state == SDL_ENABLE ) { | |
| 452 SDL_eventstate |= (0x00000001 << (type)); | |
| 453 } else { | |
| 454 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 455 } | |
| 456 } | |
| 457 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 458 ; | |
| 459 return(current_state); | |
| 460 } | |
| 461 | |
| 462 /* Just set the state for one event type */ | |
| 463 current_state = SDL_ProcessEvents[type]; | |
| 464 switch (state) { | |
| 465 case SDL_IGNORE: | |
| 466 case SDL_ENABLE: | |
| 467 /* Set state and discard pending events */ | |
| 468 SDL_ProcessEvents[type] = state; | |
| 469 if ( state == SDL_ENABLE ) { | |
| 470 SDL_eventstate |= (0x00000001 << (type)); | |
| 471 } else { | |
| 472 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 473 } | |
| 474 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 475 ; | |
| 476 break; | |
| 477 default: | |
| 478 /* Querying state? */ | |
| 479 break; | |
| 480 } | |
| 481 return(current_state); | |
| 482 } | |
| 483 | |
| 484 /* This is a generic event handler. | |
| 485 */ | |
| 486 int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message) | |
| 487 { | |
| 488 int posted; | |
| 489 | |
| 490 posted = 0; | |
| 491 if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) { | |
| 492 SDL_Event event; | |
| 493 memset(&event, 0, sizeof(event)); | |
| 494 event.type = SDL_SYSWMEVENT; | |
| 495 event.syswm.msg = message; | |
| 496 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 497 posted = 1; | |
| 498 SDL_PushEvent(&event); | |
| 499 } | |
| 500 } | |
| 501 /* Update internal event state */ | |
| 502 return(posted); | |
| 503 } |