Mercurial > sdl-ios-xcode
annotate src/events/SDL_events.c @ 1361:19418e4422cb
New configure-based build system. Still work in progress, but much improved
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 16 Feb 2006 10:11:48 +0000 |
| parents | c71e05b4dc2e |
| children | d910939febfa |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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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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 "SDL.h" | |
| 26 #include "SDL_syswm.h" | |
| 27 #include "SDL_sysevents.h" | |
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28 #include "SDL_events_c.h" |
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29 #include "../timer/SDL_timer_c.h" |
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30 #if !SDL_JOYSTICK_DISABLED |
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31 #include "../joystick/SDL_joystick_c.h" |
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32 #endif |
| 0 | 33 |
| 34 /* Public data -- the event filter */ | |
| 35 SDL_EventFilter SDL_EventOK = NULL; | |
| 36 Uint8 SDL_ProcessEvents[SDL_NUMEVENTS]; | |
| 37 static Uint32 SDL_eventstate = 0; | |
| 38 | |
| 39 /* Private data -- event queue */ | |
| 40 #define MAXEVENTS 128 | |
| 41 static struct { | |
| 42 SDL_mutex *lock; | |
| 43 int active; | |
| 44 int head; | |
| 45 int tail; | |
| 46 SDL_Event event[MAXEVENTS]; | |
| 47 int wmmsg_next; | |
| 48 struct SDL_SysWMmsg wmmsg[MAXEVENTS]; | |
| 49 } SDL_EventQ; | |
| 50 | |
| 51 /* Private data -- event locking structure */ | |
| 52 static struct { | |
| 53 SDL_mutex *lock; | |
| 54 int safe; | |
| 55 } SDL_EventLock; | |
| 56 | |
| 57 /* Thread functions */ | |
| 58 static SDL_Thread *SDL_EventThread = NULL; /* Thread handle */ | |
| 59 static Uint32 event_thread; /* The event thread id */ | |
| 60 | |
| 61 void SDL_Lock_EventThread(void) | |
| 62 { | |
| 63 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 64 /* Grab lock and spin until we're sure event thread stopped */ | |
| 65 SDL_mutexP(SDL_EventLock.lock); | |
| 66 while ( ! SDL_EventLock.safe ) { | |
| 67 SDL_Delay(1); | |
| 68 } | |
| 69 } | |
| 70 } | |
| 71 void SDL_Unlock_EventThread(void) | |
| 72 { | |
| 73 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 74 SDL_mutexV(SDL_EventLock.lock); | |
| 75 } | |
| 76 } | |
| 77 | |
| 1190 | 78 #ifdef __OS2__ |
| 79 /* | |
| 80 * We'll increase the priority of GobbleEvents thread, so it will process | |
| 81 * events in time for sure! For this, we need the DosSetPriority() API | |
| 82 * from the os2.h include file. | |
| 83 */ | |
| 84 #define INCL_DOSPROCESS | |
| 85 #include <os2.h> | |
| 86 #include <time.h> | |
| 87 #endif | |
| 88 | |
| 0 | 89 static int SDL_GobbleEvents(void *unused) |
| 90 { | |
| 91 event_thread = SDL_ThreadID(); | |
| 1190 | 92 |
| 93 #ifdef __OS2__ | |
| 94 #ifdef USE_DOSSETPRIORITY | |
| 95 /* Increase thread priority, so it will process events in time for sure! */ | |
| 96 DosSetPriority(PRTYS_THREAD, PRTYC_REGULAR, +16, 0); | |
| 97 #endif | |
| 98 #endif | |
| 99 | |
| 0 | 100 while ( SDL_EventQ.active ) { |
| 101 SDL_VideoDevice *video = current_video; | |
| 102 SDL_VideoDevice *this = current_video; | |
| 103 | |
| 104 /* Get events from the video subsystem */ | |
| 105 if ( video ) { | |
| 106 video->PumpEvents(this); | |
| 107 } | |
| 108 | |
| 109 /* Queue pending key-repeat events */ | |
| 110 SDL_CheckKeyRepeat(); | |
| 111 | |
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112 #if !SDL_JOYSTICK_DISABLED |
| 0 | 113 /* Check for joystick state change */ |
| 114 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 115 SDL_JoystickUpdate(); | |
| 116 } | |
| 117 #endif | |
| 118 | |
| 119 /* Give up the CPU for the rest of our timeslice */ | |
| 120 SDL_EventLock.safe = 1; | |
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121 if ( SDL_timer_running ) { |
| 0 | 122 SDL_ThreadedTimerCheck(); |
| 123 } | |
| 124 SDL_Delay(1); | |
| 125 | |
| 126 /* Check for event locking. | |
| 127 On the P of the lock mutex, if the lock is held, this thread | |
| 128 will wait until the lock is released before continuing. The | |
| 129 safe flag will be set, meaning that the other thread can go | |
| 130 about it's business. The safe flag is reset before the V, | |
| 131 so as soon as the mutex is free, other threads can see that | |
| 132 it's not safe to interfere with the event thread. | |
| 133 */ | |
| 134 SDL_mutexP(SDL_EventLock.lock); | |
| 135 SDL_EventLock.safe = 0; | |
| 136 SDL_mutexV(SDL_EventLock.lock); | |
| 137 } | |
| 138 SDL_SetTimerThreaded(0); | |
| 139 event_thread = 0; | |
| 140 return(0); | |
| 141 } | |
| 142 | |
| 143 static int SDL_StartEventThread(Uint32 flags) | |
| 144 { | |
| 145 /* Reset everything to zero */ | |
| 146 SDL_EventThread = NULL; | |
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147 SDL_memset(&SDL_EventLock, 0, sizeof(SDL_EventLock)); |
| 0 | 148 |
| 149 /* Create the lock and set ourselves active */ | |
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150 #if !SDL_THREADS_DISABLED |
| 0 | 151 SDL_EventQ.lock = SDL_CreateMutex(); |
| 152 if ( SDL_EventQ.lock == NULL ) { | |
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153 #ifdef macintosh /* MacOS classic you can't multithread, so no lock needed */ |
| 0 | 154 ; |
| 155 #else | |
| 156 return(-1); | |
| 157 #endif | |
| 158 } | |
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159 #endif /* !SDL_THREADS_DISABLED */ |
| 0 | 160 SDL_EventQ.active = 1; |
| 161 | |
| 162 if ( (flags&SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) { | |
| 163 SDL_EventLock.lock = SDL_CreateMutex(); | |
| 164 if ( SDL_EventLock.lock == NULL ) { | |
| 165 return(-1); | |
| 166 } | |
| 167 SDL_EventLock.safe = 0; | |
| 168 | |
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169 /* The event thread will handle timers too */ |
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170 SDL_SetTimerThreaded(2); |
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171 #if (defined(_WIN32) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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172 #undef SDL_CreateThread |
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173 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL, NULL, NULL); |
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174 #else |
| 0 | 175 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL); |
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176 #endif |
| 0 | 177 if ( SDL_EventThread == NULL ) { |
| 178 return(-1); | |
| 179 } | |
| 180 } else { | |
| 181 event_thread = 0; | |
| 182 } | |
| 183 return(0); | |
| 184 } | |
| 185 | |
| 186 static void SDL_StopEventThread(void) | |
| 187 { | |
| 188 SDL_EventQ.active = 0; | |
| 189 if ( SDL_EventThread ) { | |
| 190 SDL_WaitThread(SDL_EventThread, NULL); | |
| 191 SDL_EventThread = NULL; | |
| 192 SDL_DestroyMutex(SDL_EventLock.lock); | |
| 193 } | |
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194 #ifndef IPOD |
| 0 | 195 SDL_DestroyMutex(SDL_EventQ.lock); |
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196 #endif |
| 0 | 197 } |
| 198 | |
| 199 Uint32 SDL_EventThreadID(void) | |
| 200 { | |
| 201 return(event_thread); | |
| 202 } | |
| 203 | |
| 204 /* Public functions */ | |
| 205 | |
| 206 void SDL_StopEventLoop(void) | |
| 207 { | |
| 208 /* Halt the event thread, if running */ | |
| 209 SDL_StopEventThread(); | |
| 210 | |
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211 /* Shutdown event handlers */ |
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212 SDL_AppActiveQuit(); |
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213 SDL_KeyboardQuit(); |
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214 SDL_MouseQuit(); |
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215 SDL_QuitQuit(); |
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216 |
| 0 | 217 /* Clean out EventQ */ |
| 218 SDL_EventQ.head = 0; | |
| 219 SDL_EventQ.tail = 0; | |
| 220 SDL_EventQ.wmmsg_next = 0; | |
| 221 } | |
| 222 | |
| 223 /* This function (and associated calls) may be called more than once */ | |
| 224 int SDL_StartEventLoop(Uint32 flags) | |
| 225 { | |
| 226 int retcode; | |
| 227 | |
| 228 /* Clean out the event queue */ | |
| 229 SDL_EventThread = NULL; | |
| 230 SDL_EventQ.lock = NULL; | |
| 231 SDL_StopEventLoop(); | |
| 232 | |
| 233 /* No filter to start with, process most event types */ | |
| 234 SDL_EventOK = NULL; | |
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235 SDL_memset(SDL_ProcessEvents,SDL_ENABLE,sizeof(SDL_ProcessEvents)); |
| 0 | 236 SDL_eventstate = ~0; |
| 237 /* It's not save to call SDL_EventState() yet */ | |
| 238 SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT); | |
| 239 SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE; | |
| 240 | |
| 241 /* Initialize event handlers */ | |
| 242 retcode = 0; | |
| 243 retcode += SDL_AppActiveInit(); | |
| 244 retcode += SDL_KeyboardInit(); | |
| 245 retcode += SDL_MouseInit(); | |
| 246 retcode += SDL_QuitInit(); | |
| 247 if ( retcode < 0 ) { | |
| 248 /* We don't expect them to fail, but... */ | |
| 249 return(-1); | |
| 250 } | |
| 251 | |
| 252 /* Create the lock and event thread */ | |
| 253 if ( SDL_StartEventThread(flags) < 0 ) { | |
| 254 SDL_StopEventLoop(); | |
| 255 return(-1); | |
| 256 } | |
| 257 return(0); | |
| 258 } | |
| 259 | |
| 260 | |
| 261 /* Add an event to the event queue -- called with the queue locked */ | |
| 262 static int SDL_AddEvent(SDL_Event *event) | |
| 263 { | |
| 264 int tail, added; | |
| 265 | |
| 266 tail = (SDL_EventQ.tail+1)%MAXEVENTS; | |
| 267 if ( tail == SDL_EventQ.head ) { | |
| 268 /* Overflow, drop event */ | |
| 269 added = 0; | |
| 270 } else { | |
| 271 SDL_EventQ.event[SDL_EventQ.tail] = *event; | |
| 272 if (event->type == SDL_SYSWMEVENT) { | |
| 273 /* Note that it's possible to lose an event */ | |
| 274 int next = SDL_EventQ.wmmsg_next; | |
| 275 SDL_EventQ.wmmsg[next] = *event->syswm.msg; | |
| 276 SDL_EventQ.event[SDL_EventQ.tail].syswm.msg = | |
| 277 &SDL_EventQ.wmmsg[next]; | |
| 278 SDL_EventQ.wmmsg_next = (next+1)%MAXEVENTS; | |
| 279 } | |
| 280 SDL_EventQ.tail = tail; | |
| 281 added = 1; | |
| 282 } | |
| 283 return(added); | |
| 284 } | |
| 285 | |
| 286 /* Cut an event, and return the next valid spot, or the tail */ | |
| 287 /* -- called with the queue locked */ | |
| 288 static int SDL_CutEvent(int spot) | |
| 289 { | |
| 290 if ( spot == SDL_EventQ.head ) { | |
| 291 SDL_EventQ.head = (SDL_EventQ.head+1)%MAXEVENTS; | |
| 292 return(SDL_EventQ.head); | |
| 293 } else | |
| 294 if ( (spot+1)%MAXEVENTS == SDL_EventQ.tail ) { | |
| 295 SDL_EventQ.tail = spot; | |
| 296 return(SDL_EventQ.tail); | |
| 297 } else | |
| 298 /* We cut the middle -- shift everything over */ | |
| 299 { | |
| 300 int here, next; | |
| 301 | |
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302 /* This can probably be optimized with SDL_memcpy() -- careful! */ |
| 0 | 303 if ( --SDL_EventQ.tail < 0 ) { |
| 304 SDL_EventQ.tail = MAXEVENTS-1; | |
| 305 } | |
| 306 for ( here=spot; here != SDL_EventQ.tail; here = next ) { | |
| 307 next = (here+1)%MAXEVENTS; | |
| 308 SDL_EventQ.event[here] = SDL_EventQ.event[next]; | |
| 309 } | |
| 310 return(spot); | |
| 311 } | |
| 312 /* NOTREACHED */ | |
| 313 } | |
| 314 | |
| 315 /* Lock the event queue, take a peep at it, and unlock it */ | |
| 316 int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action, | |
| 317 Uint32 mask) | |
| 318 { | |
| 319 int i, used; | |
| 320 | |
| 321 /* Don't look after we've quit */ | |
| 322 if ( ! SDL_EventQ.active ) { | |
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323 return(-1); |
| 0 | 324 } |
| 325 /* Lock the event queue */ | |
| 326 used = 0; | |
| 327 if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) { | |
| 328 if ( action == SDL_ADDEVENT ) { | |
| 329 for ( i=0; i<numevents; ++i ) { | |
| 330 used += SDL_AddEvent(&events[i]); | |
| 331 } | |
| 332 } else { | |
| 333 SDL_Event tmpevent; | |
| 334 int spot; | |
| 335 | |
| 336 /* If 'events' is NULL, just see if they exist */ | |
| 337 if ( events == NULL ) { | |
| 338 action = SDL_PEEKEVENT; | |
| 339 numevents = 1; | |
| 340 events = &tmpevent; | |
| 341 } | |
| 342 spot = SDL_EventQ.head; | |
| 343 while ((used < numevents)&&(spot != SDL_EventQ.tail)) { | |
| 344 if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) { | |
| 345 events[used++] = SDL_EventQ.event[spot]; | |
| 346 if ( action == SDL_GETEVENT ) { | |
| 347 spot = SDL_CutEvent(spot); | |
| 348 } else { | |
| 349 spot = (spot+1)%MAXEVENTS; | |
| 350 } | |
| 351 } else { | |
| 352 spot = (spot+1)%MAXEVENTS; | |
| 353 } | |
| 354 } | |
| 355 } | |
| 356 SDL_mutexV(SDL_EventQ.lock); | |
| 357 } else { | |
| 358 SDL_SetError("Couldn't lock event queue"); | |
| 359 used = -1; | |
| 360 } | |
| 361 return(used); | |
| 362 } | |
| 363 | |
| 364 /* Run the system dependent event loops */ | |
| 365 void SDL_PumpEvents(void) | |
| 366 { | |
| 367 if ( !SDL_EventThread ) { | |
| 368 SDL_VideoDevice *video = current_video; | |
| 369 SDL_VideoDevice *this = current_video; | |
| 370 | |
| 371 /* Get events from the video subsystem */ | |
| 372 if ( video ) { | |
| 373 video->PumpEvents(this); | |
| 374 } | |
| 375 | |
| 376 /* Queue pending key-repeat events */ | |
| 377 SDL_CheckKeyRepeat(); | |
| 378 | |
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379 #if !SDL_JOYSTICK_DISABLED |
| 0 | 380 /* Check for joystick state change */ |
| 381 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 382 SDL_JoystickUpdate(); | |
| 383 } | |
| 384 #endif | |
| 385 } | |
| 386 } | |
| 387 | |
| 388 /* Public functions */ | |
| 389 | |
| 390 int SDL_PollEvent (SDL_Event *event) | |
| 391 { | |
| 392 SDL_PumpEvents(); | |
| 393 | |
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394 /* We can't return -1, just return 0 (no event) on error */ |
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395 if ( SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0 ) |
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396 return 0; |
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397 return 1; |
| 0 | 398 } |
| 399 | |
| 400 int SDL_WaitEvent (SDL_Event *event) | |
| 401 { | |
| 402 while ( 1 ) { | |
| 403 SDL_PumpEvents(); | |
| 404 switch(SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) { | |
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The documented error return value for SDL_WaitEvent() is 0.
Sam Lantinga <slouken@libsdl.org>
parents:
352
diff
changeset
|
405 case -1: return 0; |
| 0 | 406 case 1: return 1; |
| 407 case 0: SDL_Delay(10); | |
| 408 } | |
| 409 } | |
| 410 } | |
| 411 | |
| 412 int SDL_PushEvent(SDL_Event *event) | |
| 413 { | |
| 384 | 414 if ( SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0 ) |
| 415 return -1; | |
| 416 return 0; | |
| 0 | 417 } |
| 418 | |
| 419 void SDL_SetEventFilter (SDL_EventFilter filter) | |
| 420 { | |
| 421 SDL_Event bitbucket; | |
| 422 | |
| 423 /* Set filter and discard pending events */ | |
| 424 SDL_EventOK = filter; | |
| 425 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 426 ; | |
| 427 } | |
| 428 | |
| 429 SDL_EventFilter SDL_GetEventFilter(void) | |
| 430 { | |
| 431 return(SDL_EventOK); | |
| 432 } | |
| 433 | |
| 434 Uint8 SDL_EventState (Uint8 type, int state) | |
| 435 { | |
| 436 SDL_Event bitbucket; | |
| 437 Uint8 current_state; | |
| 438 | |
| 439 /* If SDL_ALLEVENTS was specified... */ | |
| 440 if ( type == 0xFF ) { | |
| 441 current_state = SDL_IGNORE; | |
| 442 for ( type=0; type<SDL_NUMEVENTS; ++type ) { | |
| 443 if ( SDL_ProcessEvents[type] != SDL_IGNORE ) { | |
| 444 current_state = SDL_ENABLE; | |
| 445 } | |
| 446 SDL_ProcessEvents[type] = state; | |
| 447 if ( state == SDL_ENABLE ) { | |
| 448 SDL_eventstate |= (0x00000001 << (type)); | |
| 449 } else { | |
| 450 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 451 } | |
| 452 } | |
| 453 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 454 ; | |
| 455 return(current_state); | |
| 456 } | |
| 457 | |
| 458 /* Just set the state for one event type */ | |
| 459 current_state = SDL_ProcessEvents[type]; | |
| 460 switch (state) { | |
| 461 case SDL_IGNORE: | |
| 462 case SDL_ENABLE: | |
| 463 /* Set state and discard pending events */ | |
| 464 SDL_ProcessEvents[type] = state; | |
| 465 if ( state == SDL_ENABLE ) { | |
| 466 SDL_eventstate |= (0x00000001 << (type)); | |
| 467 } else { | |
| 468 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 469 } | |
| 470 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 471 ; | |
| 472 break; | |
| 473 default: | |
| 474 /* Querying state? */ | |
| 475 break; | |
| 476 } | |
| 477 return(current_state); | |
| 478 } | |
| 479 | |
| 480 /* This is a generic event handler. | |
| 481 */ | |
| 482 int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message) | |
| 483 { | |
| 484 int posted; | |
| 485 | |
| 486 posted = 0; | |
| 487 if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) { | |
| 488 SDL_Event event; | |
|
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3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1330
diff
changeset
|
489 SDL_memset(&event, 0, sizeof(event)); |
| 0 | 490 event.type = SDL_SYSWMEVENT; |
| 491 event.syswm.msg = message; | |
| 492 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 493 posted = 1; | |
| 494 SDL_PushEvent(&event); | |
| 495 } | |
| 496 } | |
| 497 /* Update internal event state */ | |
| 498 return(posted); | |
| 499 } |