Mercurial > sdl-ios-xcode
annotate src/events/SDL_events.c @ 1140:af8b0f9ac2f4
iPod Linux framebuffer support.
--ryan.
Date: Sun, 19 Jun 2005 15:53:22 -0700
From: Joshua Oreman <oremanj@gmail.com>
To: sdl@libsdl.org
Subject: [SDL] [PATCH] iPod framebuffer video driver
Hi SDL-list,
I've been working on a port of SDL to iPodLinux
(http://www.ipodlinux.org). I've created a patch for both the
standard 2-bit iPod screen (using an unchangeable palette) and the
16-bit iPod photo. The patch is attached, against version 1.2.8.
I've created two pages on the iPodLinux wiki about this patch:
http://www.ipodlinux.org/Building_SDL and
http://www.ipodlinux.org/SDL_Programming. See those pages if you're
curious.
Comments? Questions? Is this something that might be able to get into SDL 1.2.9?
Thanks for your feedback!
-- Josh
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 08 Sep 2005 07:33:22 +0000 |
| parents | 28ac87a38c17 |
| children | 173c063d4f55 |
| rev | line source |
|---|---|
| 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 /* General event handling code for SDL */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <string.h> | |
| 32 | |
| 33 #include "SDL.h" | |
| 34 #include "SDL_thread.h" | |
| 35 #include "SDL_mutex.h" | |
| 36 #include "SDL_events.h" | |
| 37 #include "SDL_events_c.h" | |
| 38 #include "SDL_timer_c.h" | |
| 39 #ifndef DISABLE_JOYSTICK | |
| 40 #include "SDL_joystick_c.h" | |
| 41 #endif | |
| 42 #ifndef ENABLE_X11 | |
| 43 #define DISABLE_X11 | |
| 44 #endif | |
| 45 #include "SDL_syswm.h" | |
| 46 #include "SDL_sysevents.h" | |
| 47 | |
| 48 /* Public data -- the event filter */ | |
| 49 SDL_EventFilter SDL_EventOK = NULL; | |
| 50 Uint8 SDL_ProcessEvents[SDL_NUMEVENTS]; | |
| 51 static Uint32 SDL_eventstate = 0; | |
| 52 | |
| 53 /* Private data -- event queue */ | |
| 54 #define MAXEVENTS 128 | |
| 55 static struct { | |
| 56 SDL_mutex *lock; | |
| 57 int active; | |
| 58 int head; | |
| 59 int tail; | |
| 60 SDL_Event event[MAXEVENTS]; | |
| 61 int wmmsg_next; | |
| 62 struct SDL_SysWMmsg wmmsg[MAXEVENTS]; | |
| 63 } SDL_EventQ; | |
| 64 | |
| 65 /* Private data -- event locking structure */ | |
| 66 static struct { | |
| 67 SDL_mutex *lock; | |
| 68 int safe; | |
| 69 } SDL_EventLock; | |
| 70 | |
| 71 /* Thread functions */ | |
| 72 static SDL_Thread *SDL_EventThread = NULL; /* Thread handle */ | |
| 73 static Uint32 event_thread; /* The event thread id */ | |
| 74 | |
| 75 void SDL_Lock_EventThread(void) | |
| 76 { | |
| 77 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 78 /* Grab lock and spin until we're sure event thread stopped */ | |
| 79 SDL_mutexP(SDL_EventLock.lock); | |
| 80 while ( ! SDL_EventLock.safe ) { | |
| 81 SDL_Delay(1); | |
| 82 } | |
| 83 } | |
| 84 } | |
| 85 void SDL_Unlock_EventThread(void) | |
| 86 { | |
| 87 if ( SDL_EventThread && (SDL_ThreadID() != event_thread) ) { | |
| 88 SDL_mutexV(SDL_EventLock.lock); | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 static int SDL_GobbleEvents(void *unused) | |
| 93 { | |
| 94 event_thread = SDL_ThreadID(); | |
| 95 while ( SDL_EventQ.active ) { | |
| 96 SDL_VideoDevice *video = current_video; | |
| 97 SDL_VideoDevice *this = current_video; | |
| 98 | |
| 99 /* Get events from the video subsystem */ | |
| 100 if ( video ) { | |
| 101 video->PumpEvents(this); | |
| 102 } | |
| 103 | |
| 104 /* Queue pending key-repeat events */ | |
| 105 SDL_CheckKeyRepeat(); | |
| 106 | |
| 107 #ifndef DISABLE_JOYSTICK | |
| 108 /* Check for joystick state change */ | |
| 109 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 110 SDL_JoystickUpdate(); | |
| 111 } | |
| 112 #endif | |
| 113 | |
| 114 /* Give up the CPU for the rest of our timeslice */ | |
| 115 SDL_EventLock.safe = 1; | |
|
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116 if ( SDL_timer_running ) { |
| 0 | 117 SDL_ThreadedTimerCheck(); |
| 118 } | |
| 119 SDL_Delay(1); | |
| 120 | |
| 121 /* Check for event locking. | |
| 122 On the P of the lock mutex, if the lock is held, this thread | |
| 123 will wait until the lock is released before continuing. The | |
| 124 safe flag will be set, meaning that the other thread can go | |
| 125 about it's business. The safe flag is reset before the V, | |
| 126 so as soon as the mutex is free, other threads can see that | |
| 127 it's not safe to interfere with the event thread. | |
| 128 */ | |
| 129 SDL_mutexP(SDL_EventLock.lock); | |
| 130 SDL_EventLock.safe = 0; | |
| 131 SDL_mutexV(SDL_EventLock.lock); | |
| 132 } | |
| 133 SDL_SetTimerThreaded(0); | |
| 134 event_thread = 0; | |
| 135 return(0); | |
| 136 } | |
| 137 | |
| 138 static int SDL_StartEventThread(Uint32 flags) | |
| 139 { | |
| 140 /* Reset everything to zero */ | |
| 141 SDL_EventThread = NULL; | |
| 142 memset(&SDL_EventLock, 0, sizeof(SDL_EventLock)); | |
| 143 | |
| 144 /* Create the lock and set ourselves active */ | |
| 145 #ifndef DISABLE_THREADS | |
| 146 SDL_EventQ.lock = SDL_CreateMutex(); | |
| 147 if ( SDL_EventQ.lock == NULL ) { | |
| 148 #ifdef macintosh /* On MacOS 7/8, you can't multithread, so no lock needed */ | |
| 149 ; | |
| 150 #else | |
| 151 return(-1); | |
| 152 #endif | |
| 153 } | |
| 154 #endif /* !DISABLE_THREADS */ | |
| 155 SDL_EventQ.active = 1; | |
| 156 | |
| 157 if ( (flags&SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) { | |
| 158 SDL_EventLock.lock = SDL_CreateMutex(); | |
| 159 if ( SDL_EventLock.lock == NULL ) { | |
| 160 return(-1); | |
| 161 } | |
| 162 SDL_EventLock.safe = 0; | |
| 163 | |
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164 /* The event thread will handle timers too */ |
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165 SDL_SetTimerThreaded(2); |
| 0 | 166 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL); |
| 167 if ( SDL_EventThread == NULL ) { | |
| 168 return(-1); | |
| 169 } | |
| 170 } else { | |
| 171 event_thread = 0; | |
| 172 } | |
| 173 return(0); | |
| 174 } | |
| 175 | |
| 176 static void SDL_StopEventThread(void) | |
| 177 { | |
| 178 SDL_EventQ.active = 0; | |
| 179 if ( SDL_EventThread ) { | |
| 180 SDL_WaitThread(SDL_EventThread, NULL); | |
| 181 SDL_EventThread = NULL; | |
| 182 SDL_DestroyMutex(SDL_EventLock.lock); | |
| 183 } | |
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184 #ifndef IPOD |
| 0 | 185 SDL_DestroyMutex(SDL_EventQ.lock); |
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186 #endif |
| 0 | 187 } |
| 188 | |
| 189 Uint32 SDL_EventThreadID(void) | |
| 190 { | |
| 191 return(event_thread); | |
| 192 } | |
| 193 | |
| 194 /* Public functions */ | |
| 195 | |
| 196 void SDL_StopEventLoop(void) | |
| 197 { | |
| 198 /* Halt the event thread, if running */ | |
| 199 SDL_StopEventThread(); | |
| 200 | |
|
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201 /* Shutdown event handlers */ |
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202 SDL_AppActiveQuit(); |
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203 SDL_KeyboardQuit(); |
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204 SDL_MouseQuit(); |
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205 SDL_QuitQuit(); |
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206 |
| 0 | 207 /* Clean out EventQ */ |
| 208 SDL_EventQ.head = 0; | |
| 209 SDL_EventQ.tail = 0; | |
| 210 SDL_EventQ.wmmsg_next = 0; | |
| 211 } | |
| 212 | |
| 213 /* This function (and associated calls) may be called more than once */ | |
| 214 int SDL_StartEventLoop(Uint32 flags) | |
| 215 { | |
| 216 int retcode; | |
| 217 | |
| 218 /* Clean out the event queue */ | |
| 219 SDL_EventThread = NULL; | |
| 220 SDL_EventQ.lock = NULL; | |
| 221 SDL_StopEventLoop(); | |
| 222 | |
| 223 /* No filter to start with, process most event types */ | |
| 224 SDL_EventOK = NULL; | |
| 225 memset(SDL_ProcessEvents,SDL_ENABLE,sizeof(SDL_ProcessEvents)); | |
| 226 SDL_eventstate = ~0; | |
| 227 /* It's not save to call SDL_EventState() yet */ | |
| 228 SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT); | |
| 229 SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE; | |
| 230 | |
| 231 /* Initialize event handlers */ | |
| 232 retcode = 0; | |
| 233 retcode += SDL_AppActiveInit(); | |
| 234 retcode += SDL_KeyboardInit(); | |
| 235 retcode += SDL_MouseInit(); | |
| 236 retcode += SDL_QuitInit(); | |
| 237 if ( retcode < 0 ) { | |
| 238 /* We don't expect them to fail, but... */ | |
| 239 return(-1); | |
| 240 } | |
| 241 | |
| 242 /* Create the lock and event thread */ | |
| 243 if ( SDL_StartEventThread(flags) < 0 ) { | |
| 244 SDL_StopEventLoop(); | |
| 245 return(-1); | |
| 246 } | |
| 247 return(0); | |
| 248 } | |
| 249 | |
| 250 | |
| 251 /* Add an event to the event queue -- called with the queue locked */ | |
| 252 static int SDL_AddEvent(SDL_Event *event) | |
| 253 { | |
| 254 int tail, added; | |
| 255 | |
| 256 tail = (SDL_EventQ.tail+1)%MAXEVENTS; | |
| 257 if ( tail == SDL_EventQ.head ) { | |
| 258 /* Overflow, drop event */ | |
| 259 added = 0; | |
| 260 } else { | |
| 261 SDL_EventQ.event[SDL_EventQ.tail] = *event; | |
| 262 if (event->type == SDL_SYSWMEVENT) { | |
| 263 /* Note that it's possible to lose an event */ | |
| 264 int next = SDL_EventQ.wmmsg_next; | |
| 265 SDL_EventQ.wmmsg[next] = *event->syswm.msg; | |
| 266 SDL_EventQ.event[SDL_EventQ.tail].syswm.msg = | |
| 267 &SDL_EventQ.wmmsg[next]; | |
| 268 SDL_EventQ.wmmsg_next = (next+1)%MAXEVENTS; | |
| 269 } | |
| 270 SDL_EventQ.tail = tail; | |
| 271 added = 1; | |
| 272 } | |
| 273 return(added); | |
| 274 } | |
| 275 | |
| 276 /* Cut an event, and return the next valid spot, or the tail */ | |
| 277 /* -- called with the queue locked */ | |
| 278 static int SDL_CutEvent(int spot) | |
| 279 { | |
| 280 if ( spot == SDL_EventQ.head ) { | |
| 281 SDL_EventQ.head = (SDL_EventQ.head+1)%MAXEVENTS; | |
| 282 return(SDL_EventQ.head); | |
| 283 } else | |
| 284 if ( (spot+1)%MAXEVENTS == SDL_EventQ.tail ) { | |
| 285 SDL_EventQ.tail = spot; | |
| 286 return(SDL_EventQ.tail); | |
| 287 } else | |
| 288 /* We cut the middle -- shift everything over */ | |
| 289 { | |
| 290 int here, next; | |
| 291 | |
| 292 /* This can probably be optimized with memcpy() -- careful! */ | |
| 293 if ( --SDL_EventQ.tail < 0 ) { | |
| 294 SDL_EventQ.tail = MAXEVENTS-1; | |
| 295 } | |
| 296 for ( here=spot; here != SDL_EventQ.tail; here = next ) { | |
| 297 next = (here+1)%MAXEVENTS; | |
| 298 SDL_EventQ.event[here] = SDL_EventQ.event[next]; | |
| 299 } | |
| 300 return(spot); | |
| 301 } | |
| 302 /* NOTREACHED */ | |
| 303 } | |
| 304 | |
| 305 /* Lock the event queue, take a peep at it, and unlock it */ | |
| 306 int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_eventaction action, | |
| 307 Uint32 mask) | |
| 308 { | |
| 309 int i, used; | |
| 310 | |
| 311 /* Don't look after we've quit */ | |
| 312 if ( ! SDL_EventQ.active ) { | |
|
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313 return(-1); |
| 0 | 314 } |
| 315 /* Lock the event queue */ | |
| 316 used = 0; | |
| 317 if ( SDL_mutexP(SDL_EventQ.lock) == 0 ) { | |
| 318 if ( action == SDL_ADDEVENT ) { | |
| 319 for ( i=0; i<numevents; ++i ) { | |
| 320 used += SDL_AddEvent(&events[i]); | |
| 321 } | |
| 322 } else { | |
| 323 SDL_Event tmpevent; | |
| 324 int spot; | |
| 325 | |
| 326 /* If 'events' is NULL, just see if they exist */ | |
| 327 if ( events == NULL ) { | |
| 328 action = SDL_PEEKEVENT; | |
| 329 numevents = 1; | |
| 330 events = &tmpevent; | |
| 331 } | |
| 332 spot = SDL_EventQ.head; | |
| 333 while ((used < numevents)&&(spot != SDL_EventQ.tail)) { | |
| 334 if ( mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type) ) { | |
| 335 events[used++] = SDL_EventQ.event[spot]; | |
| 336 if ( action == SDL_GETEVENT ) { | |
| 337 spot = SDL_CutEvent(spot); | |
| 338 } else { | |
| 339 spot = (spot+1)%MAXEVENTS; | |
| 340 } | |
| 341 } else { | |
| 342 spot = (spot+1)%MAXEVENTS; | |
| 343 } | |
| 344 } | |
| 345 } | |
| 346 SDL_mutexV(SDL_EventQ.lock); | |
| 347 } else { | |
| 348 SDL_SetError("Couldn't lock event queue"); | |
| 349 used = -1; | |
| 350 } | |
| 351 return(used); | |
| 352 } | |
| 353 | |
| 354 /* Run the system dependent event loops */ | |
| 355 void SDL_PumpEvents(void) | |
| 356 { | |
| 357 if ( !SDL_EventThread ) { | |
| 358 SDL_VideoDevice *video = current_video; | |
| 359 SDL_VideoDevice *this = current_video; | |
| 360 | |
| 361 /* Get events from the video subsystem */ | |
| 362 if ( video ) { | |
| 363 video->PumpEvents(this); | |
| 364 } | |
| 365 | |
| 366 /* Queue pending key-repeat events */ | |
| 367 SDL_CheckKeyRepeat(); | |
| 368 | |
| 369 #ifndef DISABLE_JOYSTICK | |
| 370 /* Check for joystick state change */ | |
| 371 if ( SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK) ) { | |
| 372 SDL_JoystickUpdate(); | |
| 373 } | |
| 374 #endif | |
| 375 } | |
| 376 } | |
| 377 | |
| 378 /* Public functions */ | |
| 379 | |
| 380 int SDL_PollEvent (SDL_Event *event) | |
| 381 { | |
| 382 SDL_PumpEvents(); | |
| 383 | |
|
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384 /* We can't return -1, just return 0 (no event) on error */ |
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385 if ( SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0 ) |
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386 return 0; |
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387 return 1; |
| 0 | 388 } |
| 389 | |
| 390 int SDL_WaitEvent (SDL_Event *event) | |
| 391 { | |
| 392 while ( 1 ) { | |
| 393 SDL_PumpEvents(); | |
| 394 switch(SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) { | |
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395 case -1: return 0; |
| 0 | 396 case 1: return 1; |
| 397 case 0: SDL_Delay(10); | |
| 398 } | |
| 399 } | |
| 400 } | |
| 401 | |
| 402 int SDL_PushEvent(SDL_Event *event) | |
| 403 { | |
| 384 | 404 if ( SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0 ) |
| 405 return -1; | |
| 406 return 0; | |
| 0 | 407 } |
| 408 | |
| 409 void SDL_SetEventFilter (SDL_EventFilter filter) | |
| 410 { | |
| 411 SDL_Event bitbucket; | |
| 412 | |
| 413 /* Set filter and discard pending events */ | |
| 414 SDL_EventOK = filter; | |
| 415 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 416 ; | |
| 417 } | |
| 418 | |
| 419 SDL_EventFilter SDL_GetEventFilter(void) | |
| 420 { | |
| 421 return(SDL_EventOK); | |
| 422 } | |
| 423 | |
| 424 Uint8 SDL_EventState (Uint8 type, int state) | |
| 425 { | |
| 426 SDL_Event bitbucket; | |
| 427 Uint8 current_state; | |
| 428 | |
| 429 /* If SDL_ALLEVENTS was specified... */ | |
| 430 if ( type == 0xFF ) { | |
| 431 current_state = SDL_IGNORE; | |
| 432 for ( type=0; type<SDL_NUMEVENTS; ++type ) { | |
| 433 if ( SDL_ProcessEvents[type] != SDL_IGNORE ) { | |
| 434 current_state = SDL_ENABLE; | |
| 435 } | |
| 436 SDL_ProcessEvents[type] = state; | |
| 437 if ( state == SDL_ENABLE ) { | |
| 438 SDL_eventstate |= (0x00000001 << (type)); | |
| 439 } else { | |
| 440 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 441 } | |
| 442 } | |
| 443 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 444 ; | |
| 445 return(current_state); | |
| 446 } | |
| 447 | |
| 448 /* Just set the state for one event type */ | |
| 449 current_state = SDL_ProcessEvents[type]; | |
| 450 switch (state) { | |
| 451 case SDL_IGNORE: | |
| 452 case SDL_ENABLE: | |
| 453 /* Set state and discard pending events */ | |
| 454 SDL_ProcessEvents[type] = state; | |
| 455 if ( state == SDL_ENABLE ) { | |
| 456 SDL_eventstate |= (0x00000001 << (type)); | |
| 457 } else { | |
| 458 SDL_eventstate &= ~(0x00000001 << (type)); | |
| 459 } | |
| 460 while ( SDL_PollEvent(&bitbucket) > 0 ) | |
| 461 ; | |
| 462 break; | |
| 463 default: | |
| 464 /* Querying state? */ | |
| 465 break; | |
| 466 } | |
| 467 return(current_state); | |
| 468 } | |
| 469 | |
| 470 /* This is a generic event handler. | |
| 471 */ | |
| 472 int SDL_PrivateSysWMEvent(SDL_SysWMmsg *message) | |
| 473 { | |
| 474 int posted; | |
| 475 | |
| 476 posted = 0; | |
| 477 if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) { | |
| 478 SDL_Event event; | |
| 479 memset(&event, 0, sizeof(event)); | |
| 480 event.type = SDL_SYSWMEVENT; | |
| 481 event.syswm.msg = message; | |
| 482 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 483 posted = 1; | |
| 484 SDL_PushEvent(&event); | |
| 485 } | |
| 486 } | |
| 487 /* Update internal event state */ | |
| 488 return(posted); | |
| 489 } |