Mercurial > sdl-ios-xcode
annotate src/events/SDL_events.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 06 Feb 2006 08:28:51 +0000 |
| parents | c9b51268668f |
| children | 3692456e7b0f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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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Sam Lantinga <slouken@libsdl.org>
parents:
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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_thread.h" | |
| 27 #include "SDL_mutex.h" | |
| 28 #include "SDL_events.h" | |
|
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29 #include "SDL_string.h" |
| 0 | 30 #include "SDL_events_c.h" |
| 31 #include "SDL_timer_c.h" | |
| 32 #ifndef DISABLE_JOYSTICK | |
| 33 #include "SDL_joystick_c.h" | |
| 34 #endif | |
| 35 #ifndef ENABLE_X11 | |
| 36 #define DISABLE_X11 | |
| 37 #endif | |
| 38 #include "SDL_syswm.h" | |
| 39 #include "SDL_sysevents.h" | |
| 40 | |
| 41 /* Public data -- the event filter */ | |
| 42 SDL_EventFilter SDL_EventOK = NULL; | |
| 43 Uint8 SDL_ProcessEvents[SDL_NUMEVENTS]; | |
| 44 static Uint32 SDL_eventstate = 0; | |
| 45 | |
| 46 /* Private data -- event queue */ | |
| 47 #define MAXEVENTS 128 | |
| 48 static struct { | |
| 49 SDL_mutex *lock; | |
| 50 int active; | |
| 51 int head; | |
| 52 int tail; | |
| 53 SDL_Event event[MAXEVENTS]; | |
| 54 int wmmsg_next; | |
| 55 struct SDL_SysWMmsg wmmsg[MAXEVENTS]; | |
| 56 } SDL_EventQ; | |
| 57 | |
| 58 /* Private data -- event locking structure */ | |
| 59 static struct { | |
| 60 SDL_mutex *lock; | |
| 61 int safe; | |
| 62 } SDL_EventLock; | |
| 63 | |
| 64 /* Thread functions */ | |
| 65 static SDL_Thread *SDL_EventThread = NULL; /* Thread handle */ | |
| 66 static Uint32 event_thread; /* The event thread id */ | |
| 67 | |
| 68 void SDL_Lock_EventThread(void) | |
| 69 { | |
| 70 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 71 /* Grab lock and spin until we're sure event thread stopped */ | |
| 72 SDL_mutexP(SDL_EventLock.lock); | |
| 73 while ( ! SDL_EventLock.safe ) { | |
| 74 SDL_Delay(1); | |
| 75 } | |
| 76 } | |
| 77 } | |
| 78 void SDL_Unlock_EventThread(void) | |
| 79 { | |
| 80 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 81 SDL_mutexV(SDL_EventLock.lock); | |
| 82 } | |
| 83 } | |
| 84 | |
| 1190 | 85 #ifdef __OS2__ |
| 86 /* | |
| 87 * We'll increase the priority of GobbleEvents thread, so it will process | |
| 88 * events in time for sure! For this, we need the DosSetPriority() API | |
| 89 * from the os2.h include file. | |
| 90 */ | |
| 91 #define INCL_DOSPROCESS | |
| 92 #include <os2.h> | |
| 93 #include <time.h> | |
| 94 #endif | |
| 95 | |
| 0 | 96 static int SDL_GobbleEvents(void *unused) |
| 97 { | |
| 98 event_thread = SDL_ThreadID(); | |
| 1190 | 99 |
| 100 #ifdef __OS2__ | |
| 101 #ifdef USE_DOSSETPRIORITY | |
| 102 /* Increase thread priority, so it will process events in time for sure! */ | |
| 103 DosSetPriority(PRTYS_THREAD, PRTYC_REGULAR, +16, 0); | |
| 104 #endif | |
| 105 #endif | |
| 106 | |
| 0 | 107 while ( SDL_EventQ.active ) { |
| 108 SDL_VideoDevice *video = current_video; | |
| 109 SDL_VideoDevice *this = current_video; | |
| 110 | |
| 111 /* Get events from the video subsystem */ | |
| 112 if ( video ) { | |
| 113 video->PumpEvents(this); | |
| 114 } | |
| 115 | |
| 116 /* Queue pending key-repeat events */ | |
| 117 SDL_CheckKeyRepeat(); | |
| 118 | |
| 119 #ifndef DISABLE_JOYSTICK | |
| 120 /* Check for joystick state change */ | |
| 121 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 122 SDL_JoystickUpdate(); | |
| 123 } | |
| 124 #endif | |
| 125 | |
| 126 /* Give up the CPU for the rest of our timeslice */ | |
| 127 SDL_EventLock.safe = 1; | |
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128 if ( SDL_timer_running ) { |
| 0 | 129 SDL_ThreadedTimerCheck(); |
| 130 } | |
| 131 SDL_Delay(1); | |
| 132 | |
| 133 /* Check for event locking. | |
| 134 On the P of the lock mutex, if the lock is held, this thread | |
| 135 will wait until the lock is released before continuing. The | |
| 136 safe flag will be set, meaning that the other thread can go | |
| 137 about it's business. The safe flag is reset before the V, | |
| 138 so as soon as the mutex is free, other threads can see that | |
| 139 it's not safe to interfere with the event thread. | |
| 140 */ | |
| 141 SDL_mutexP(SDL_EventLock.lock); | |
| 142 SDL_EventLock.safe = 0; | |
| 143 SDL_mutexV(SDL_EventLock.lock); | |
| 144 } | |
| 145 SDL_SetTimerThreaded(0); | |
| 146 event_thread = 0; | |
| 147 return(0); | |
| 148 } | |
| 149 | |
| 150 static int SDL_StartEventThread(Uint32 flags) | |
| 151 { | |
| 152 /* Reset everything to zero */ | |
| 153 SDL_EventThread = NULL; | |
| 154 memset(&SDL_EventLock, 0, sizeof(SDL_EventLock)); | |
| 155 | |
| 156 /* Create the lock and set ourselves active */ | |
| 157 #ifndef DISABLE_THREADS | |
| 158 SDL_EventQ.lock = SDL_CreateMutex(); | |
| 159 if ( SDL_EventQ.lock == NULL ) { | |
| 160 #ifdef macintosh /* On MacOS 7/8, you can't multithread, so no lock needed */ | |
| 161 ; | |
| 162 #else | |
| 163 return(-1); | |
| 164 #endif | |
| 165 } | |
| 166 #endif /* !DISABLE_THREADS */ | |
| 167 SDL_EventQ.active = 1; | |
| 168 | |
| 169 if ( (flags&SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) { | |
| 170 SDL_EventLock.lock = SDL_CreateMutex(); | |
| 171 if ( SDL_EventLock.lock == NULL ) { | |
| 172 return(-1); | |
| 173 } | |
| 174 SDL_EventLock.safe = 0; | |
| 175 | |
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176 /* The event thread will handle timers too */ |
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177 SDL_SetTimerThreaded(2); |
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It's now possible to build SDL without any C runtime at all on Windows,
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178 #if (defined(_WIN32) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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It's now possible to build SDL without any C runtime at all on Windows,
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179 #undef SDL_CreateThread |
|
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
180 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL, NULL, NULL); |
|
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
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changeset
|
181 #else |
| 0 | 182 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL); |
|
1330
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
183 #endif |
| 0 | 184 if ( SDL_EventThread == NULL ) { |
| 185 return(-1); | |
| 186 } | |
| 187 } else { | |
| 188 event_thread = 0; | |
| 189 } | |
| 190 return(0); | |
| 191 } | |
| 192 | |
| 193 static void SDL_StopEventThread(void) | |
| 194 { | |
| 195 SDL_EventQ.active = 0; | |
| 196 if ( SDL_EventThread ) { | |
| 197 SDL_WaitThread(SDL_EventThread, NULL); | |
| 198 SDL_EventThread = NULL; | |
| 199 SDL_DestroyMutex(SDL_EventLock.lock); | |
| 200 } | |
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201 #ifndef IPOD |
| 0 | 202 SDL_DestroyMutex(SDL_EventQ.lock); |
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203 #endif |
| 0 | 204 } |
| 205 | |
| 206 Uint32 SDL_EventThreadID(void) | |
| 207 { | |
| 208 return(event_thread); | |
| 209 } | |
| 210 | |
| 211 /* Public functions */ | |
| 212 | |
| 213 void SDL_StopEventLoop(void) | |
| 214 { | |
| 215 /* Halt the event thread, if running */ | |
| 216 SDL_StopEventThread(); | |
| 217 | |
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218 /* Shutdown event handlers */ |
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219 SDL_AppActiveQuit(); |
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220 SDL_KeyboardQuit(); |
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221 SDL_MouseQuit(); |
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222 SDL_QuitQuit(); |
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223 |
| 0 | 224 /* Clean out EventQ */ |
| 225 SDL_EventQ.head = 0; | |
| 226 SDL_EventQ.tail = 0; | |
| 227 SDL_EventQ.wmmsg_next = 0; | |
| 228 } | |
| 229 | |
| 230 /* This function (and associated calls) may be called more than once */ | |
| 231 int SDL_StartEventLoop(Uint32 flags) | |
| 232 { | |
| 233 int retcode; | |
| 234 | |
| 235 /* Clean out the event queue */ | |
| 236 SDL_EventThread = NULL; | |
| 237 SDL_EventQ.lock = NULL; | |
| 238 SDL_StopEventLoop(); | |
| 239 | |
| 240 /* No filter to start with, process most event types */ | |
| 241 SDL_EventOK = NULL; | |
| 242 memset(SDL_ProcessEvents,SDL_ENABLE,sizeof(SDL_ProcessEvents)); | |
| 243 SDL_eventstate = ~0; | |
| 244 /* It's not save to call SDL_EventState() yet */ | |
| 245 SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT); | |
| 246 SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE; | |
| 247 | |
| 248 /* Initialize event handlers */ | |
| 249 retcode = 0; | |
| 250 retcode += SDL_AppActiveInit(); | |
| 251 retcode += SDL_KeyboardInit(); | |
| 252 retcode += SDL_MouseInit(); | |
| 253 retcode += SDL_QuitInit(); | |
| 254 if ( retcode < 0 ) { | |
| 255 /* We don't expect them to fail, but... */ | |
| 256 return(-1); | |
| 257 } | |
| 258 | |
| 259 /* Create the lock and event thread */ | |
| 260 if ( SDL_StartEventThread(flags) < 0 ) { | |
| 261 SDL_StopEventLoop(); | |
| 262 return(-1); | |
| 263 } | |
| 264 return(0); | |
| 265 } | |
| 266 | |
| 267 | |
| 268 /* Add an event to the event queue -- called with the queue locked */ | |
| 269 static int SDL_AddEvent(SDL_Event *event) | |
| 270 { | |
| 271 int tail, added; | |
| 272 | |
| 273 tail = (SDL_EventQ.tail+1)%MAXEVENTS; | |
| 274 if ( tail == SDL_EventQ.head ) { | |
| 275 /* Overflow, drop event */ | |
| 276 added = 0; | |
| 277 } else { | |
| 278 SDL_EventQ.event[SDL_EventQ.tail] = *event; | |
| 279 if (event->type == SDL_SYSWMEVENT) { | |
| 280 /* Note that it's possible to lose an event */ | |
| 281 int next = SDL_EventQ.wmmsg_next; | |
| 282 SDL_EventQ.wmmsg[next] = *event->syswm.msg; | |
| 283 SDL_EventQ.event[SDL_EventQ.tail].syswm.msg = | |
| 284 &SDL_EventQ.wmmsg[next]; | |
| 285 SDL_EventQ.wmmsg_next = (next+1)%MAXEVENTS; | |
| 286 } | |
| 287 SDL_EventQ.tail = tail; | |
| 288 added = 1; | |
| 289 } | |
| 290 return(added); | |
| 291 } | |
| 292 | |
| 293 /* Cut an event, and return the next valid spot, or the tail */ | |
| 294 /* -- called with the queue locked */ | |
| 295 static int SDL_CutEvent(int spot) | |
| 296 { | |
| 297 if ( spot == SDL_EventQ.head ) { | |
| 298 SDL_EventQ.head = (SDL_EventQ.head+1)%MAXEVENTS; | |
| 299 return(SDL_EventQ.head); | |
| 300 } else | |
| 301 if ( (spot+1)%MAXEVENTS == SDL_EventQ.tail ) { | |
| 302 SDL_EventQ.tail = spot; | |
| 303 return(SDL_EventQ.tail); | |
| 304 } else | |
| 305 /* We cut the middle -- shift everything over */ | |
| 306 { | |
| 307 int here, next; | |
| 308 | |
| 309 /* This can probably be optimized with memcpy() -- careful! */ | |
| 310 if ( --SDL_EventQ.tail < 0 ) { | |
| 311 SDL_EventQ.tail = MAXEVENTS-1; | |
| 312 } | |
| 313 for ( here=spot; here != SDL_EventQ.tail; here = next ) { | |
| 314 next = (here+1)%MAXEVENTS; | |
| 315 SDL_EventQ.event[here] = SDL_EventQ.event[next]; | |
| 316 } | |
| 317 return(spot); | |
| 318 } | |
| 319 /* NOTREACHED */ | |
| 320 } | |
| 321 | |
| 322 /* Lock the event queue, take a peep at it, and unlock it */ | |
| 323 int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action, | |
| 324 Uint32 mask) | |
| 325 { | |
| 326 int i, used; | |
| 327 | |
| 328 /* Don't look after we've quit */ | |
| 329 if ( ! SDL_EventQ.active ) { | |
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330 return(-1); |
| 0 | 331 } |
| 332 /* Lock the event queue */ | |
| 333 used = 0; | |
| 334 if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) { | |
| 335 if ( action == SDL_ADDEVENT ) { | |
| 336 for ( i=0; i<numevents; ++i ) { | |
| 337 used += SDL_AddEvent(&events[i]); | |
| 338 } | |
| 339 } else { | |
| 340 SDL_Event tmpevent; | |
| 341 int spot; | |
| 342 | |
| 343 /* If 'events' is NULL, just see if they exist */ | |
| 344 if ( events == NULL ) { | |
| 345 action = SDL_PEEKEVENT; | |
| 346 numevents = 1; | |
| 347 events = &tmpevent; | |
| 348 } | |
| 349 spot = SDL_EventQ.head; | |
| 350 while ((used < numevents)&&(spot != SDL_EventQ.tail)) { | |
| 351 if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) { | |
| 352 events[used++] = SDL_EventQ.event[spot]; | |
| 353 if ( action == SDL_GETEVENT ) { | |
| 354 spot = SDL_CutEvent(spot); | |
| 355 } else { | |
| 356 spot = (spot+1)%MAXEVENTS; | |
| 357 } | |
| 358 } else { | |
| 359 spot = (spot+1)%MAXEVENTS; | |
| 360 } | |
| 361 } | |
| 362 } | |
| 363 SDL_mutexV(SDL_EventQ.lock); | |
| 364 } else { | |
| 365 SDL_SetError("Couldn't lock event queue"); | |
| 366 used = -1; | |
| 367 } | |
| 368 return(used); | |
| 369 } | |
| 370 | |
| 371 /* Run the system dependent event loops */ | |
| 372 void SDL_PumpEvents(void) | |
| 373 { | |
| 374 if ( !SDL_EventThread ) { | |
| 375 SDL_VideoDevice *video = current_video; | |
| 376 SDL_VideoDevice *this = current_video; | |
| 377 | |
| 378 /* Get events from the video subsystem */ | |
| 379 if ( video ) { | |
| 380 video->PumpEvents(this); | |
| 381 } | |
| 382 | |
| 383 /* Queue pending key-repeat events */ | |
| 384 SDL_CheckKeyRepeat(); | |
| 385 | |
| 386 #ifndef DISABLE_JOYSTICK | |
| 387 /* Check for joystick state change */ | |
| 388 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 389 SDL_JoystickUpdate(); | |
| 390 } | |
| 391 #endif | |
| 392 } | |
| 393 } | |
| 394 | |
| 395 /* Public functions */ | |
| 396 | |
| 397 int SDL_PollEvent (SDL_Event *event) | |
| 398 { | |
| 399 SDL_PumpEvents(); | |
| 400 | |
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401 /* We can't return -1, just return 0 (no event) on error */ |
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402 if ( SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0 ) |
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403 return 0; |
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404 return 1; |
| 0 | 405 } |
| 406 | |
| 407 int SDL_WaitEvent (SDL_Event *event) | |
| 408 { | |
| 409 while ( 1 ) { | |
| 410 SDL_PumpEvents(); | |
| 411 switch(SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) { | |
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412 case -1: return 0; |
| 0 | 413 case 1: return 1; |
| 414 case 0: SDL_Delay(10); | |
| 415 } | |
| 416 } | |
| 417 } | |
| 418 | |
| 419 int SDL_PushEvent(SDL_Event *event) | |
| 420 { | |
| 384 | 421 if ( SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0 ) |
| 422 return -1; | |
| 423 return 0; | |
| 0 | 424 } |
| 425 | |
| 426 void SDL_SetEventFilter (SDL_EventFilter filter) | |
| 427 { | |
| 428 SDL_Event bitbucket; | |
| 429 | |
| 430 /* Set filter and discard pending events */ | |
| 431 SDL_EventOK = filter; | |
| 432 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 433 ; | |
| 434 } | |
| 435 | |
| 436 SDL_EventFilter SDL_GetEventFilter(void) | |
| 437 { | |
| 438 return(SDL_EventOK); | |
| 439 } | |
| 440 | |
| 441 Uint8 SDL_EventState (Uint8 type, int state) | |
| 442 { | |
| 443 SDL_Event bitbucket; | |
| 444 Uint8 current_state; | |
| 445 | |
| 446 /* If SDL_ALLEVENTS was specified... */ | |
| 447 if ( type == 0xFF ) { | |
| 448 current_state = SDL_IGNORE; | |
| 449 for ( type=0; type<SDL_NUMEVENTS; ++type ) { | |
| 450 if ( SDL_ProcessEvents[type] != SDL_IGNORE ) { | |
| 451 current_state = SDL_ENABLE; | |
| 452 } | |
| 453 SDL_ProcessEvents[type] = state; | |
| 454 if ( state == SDL_ENABLE ) { | |
| 455 SDL_eventstate |= (0x00000001 << (type)); | |
| 456 } else { | |
| 457 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 458 } | |
| 459 } | |
| 460 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 461 ; | |
| 462 return(current_state); | |
| 463 } | |
| 464 | |
| 465 /* Just set the state for one event type */ | |
| 466 current_state = SDL_ProcessEvents[type]; | |
| 467 switch (state) { | |
| 468 case SDL_IGNORE: | |
| 469 case SDL_ENABLE: | |
| 470 /* Set state and discard pending events */ | |
| 471 SDL_ProcessEvents[type] = state; | |
| 472 if ( state == SDL_ENABLE ) { | |
| 473 SDL_eventstate |= (0x00000001 << (type)); | |
| 474 } else { | |
| 475 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 476 } | |
| 477 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 478 ; | |
| 479 break; | |
| 480 default: | |
| 481 /* Querying state? */ | |
| 482 break; | |
| 483 } | |
| 484 return(current_state); | |
| 485 } | |
| 486 | |
| 487 /* This is a generic event handler. | |
| 488 */ | |
| 489 int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message) | |
| 490 { | |
| 491 int posted; | |
| 492 | |
| 493 posted = 0; | |
| 494 if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) { | |
| 495 SDL_Event event; | |
| 496 memset(&event, 0, sizeof(event)); | |
| 497 event.type = SDL_SYSWMEVENT; | |
| 498 event.syswm.msg = message; | |
| 499 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 500 posted = 1; | |
| 501 SDL_PushEvent(&event); | |
| 502 } | |
| 503 } | |
| 504 /* Update internal event state */ | |
| 505 return(posted); | |
| 506 } |