src/events/SDL_events.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 14 Oct 2012 01:30:42 -0700
changeset 6588 f739b8044c26
parent 6495 2bf42c5e897a
child 6654 2ecfb25be1e2
permissions -rw-r--r--
Allow events at startup so we don't lose important events like SDL_DROPFILE
slouken@0
     1
/*
slouken@5535
     2
  Simple DirectMedia Layer
slouken@6138
     3
  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
slouken@0
     4
slouken@5535
     5
  This software is provided 'as-is', without any express or implied
slouken@5535
     6
  warranty.  In no event will the authors be held liable for any damages
slouken@5535
     7
  arising from the use of this software.
slouken@0
     8
slouken@5535
     9
  Permission is granted to anyone to use this software for any purpose,
slouken@5535
    10
  including commercial applications, and to alter it and redistribute it
slouken@5535
    11
  freely, subject to the following restrictions:
slouken@0
    12
slouken@5535
    13
  1. The origin of this software must not be misrepresented; you must not
slouken@5535
    14
     claim that you wrote the original software. If you use this software
slouken@5535
    15
     in a product, an acknowledgment in the product documentation would be
slouken@5535
    16
     appreciated but is not required.
slouken@5535
    17
  2. Altered source versions must be plainly marked as such, and must not be
slouken@5535
    18
     misrepresented as being the original software.
slouken@5535
    19
  3. This notice may not be removed or altered from any source distribution.
slouken@0
    20
*/
slouken@1402
    21
#include "SDL_config.h"
slouken@0
    22
slouken@0
    23
/* General event handling code for SDL */
slouken@0
    24
slouken@0
    25
#include "SDL.h"
slouken@2984
    26
#include "SDL_events.h"
slouken@0
    27
#include "SDL_syswm.h"
slouken@2984
    28
#include "SDL_thread.h"
slouken@1361
    29
#include "SDL_events_c.h"
slouken@1361
    30
#include "../timer/SDL_timer_c.h"
slouken@1361
    31
#if !SDL_JOYSTICK_DISABLED
slouken@1361
    32
#include "../joystick/SDL_joystick_c.h"
slouken@1361
    33
#endif
slouken@5123
    34
#include "../video/SDL_sysvideo.h"
slouken@0
    35
slouken@0
    36
/* Public data -- the event filter */
slouken@0
    37
SDL_EventFilter SDL_EventOK = NULL;
slouken@1895
    38
void *SDL_EventOKParam;
slouken@4429
    39
slouken@5146
    40
typedef struct SDL_EventWatcher {
slouken@5146
    41
    SDL_EventFilter callback;
slouken@5146
    42
    void *userdata;
slouken@5146
    43
    struct SDL_EventWatcher *next;
slouken@5146
    44
} SDL_EventWatcher;
slouken@5146
    45
slouken@5146
    46
static SDL_EventWatcher *SDL_event_watchers = NULL;
slouken@5146
    47
slouken@4429
    48
typedef struct {
slouken@4429
    49
    Uint32 bits[8];
slouken@4429
    50
} SDL_DisabledEventBlock;
slouken@4429
    51
slouken@4429
    52
static SDL_DisabledEventBlock *SDL_disabled_events[256];
slouken@4429
    53
static Uint32 SDL_userevents = SDL_USEREVENT;
slouken@0
    54
slouken@0
    55
/* Private data -- event queue */
slouken@0
    56
#define MAXEVENTS	128
slouken@1895
    57
static struct
slouken@1895
    58
{
slouken@1895
    59
    SDL_mutex *lock;
slouken@1895
    60
    int active;
slouken@1895
    61
    int head;
slouken@1895
    62
    int tail;
slouken@1895
    63
    SDL_Event event[MAXEVENTS];
slouken@1895
    64
    int wmmsg_next;
slouken@1895
    65
    struct SDL_SysWMmsg wmmsg[MAXEVENTS];
slouken@6588
    66
} SDL_EventQ = { NULL, 1 };
slouken@0
    67
slouken@0
    68
slouken@4429
    69
static __inline__ SDL_bool
slouken@4429
    70
SDL_ShouldPollJoystick()
slouken@4429
    71
{
paul@4698
    72
#if !SDL_JOYSTICK_DISABLED
slouken@4429
    73
    if (SDL_numjoysticks &&
slouken@4429
    74
        (!SDL_disabled_events[SDL_JOYAXISMOTION >> 8] ||
slouken@4429
    75
         SDL_JoystickEventState(SDL_QUERY))) {
slouken@4429
    76
        return SDL_TRUE;
slouken@4429
    77
    }
paul@4698
    78
#endif
slouken@4429
    79
    return SDL_FALSE;
slouken@4429
    80
}
slouken@4429
    81
slouken@0
    82
/* Public functions */
slouken@0
    83
slouken@1895
    84
void
slouken@1895
    85
SDL_StopEventLoop(void)
slouken@0
    86
{
slouken@4429
    87
    int i;
slouken@4429
    88
slouken@6495
    89
    SDL_EventQ.active = 0;
slouken@6495
    90
slouken@5123
    91
    if (SDL_EventQ.lock) {
slouken@5123
    92
        SDL_DestroyMutex(SDL_EventQ.lock);
slouken@5123
    93
        SDL_EventQ.lock = NULL;
slouken@5123
    94
    }
slouken@1123
    95
slouken@1895
    96
    /* Clean out EventQ */
slouken@1895
    97
    SDL_EventQ.head = 0;
slouken@1895
    98
    SDL_EventQ.tail = 0;
slouken@1895
    99
    SDL_EventQ.wmmsg_next = 0;
slouken@4429
   100
slouken@4429
   101
    /* Clear disabled event state */
slouken@4429
   102
    for (i = 0; i < SDL_arraysize(SDL_disabled_events); ++i) {
slouken@4429
   103
        if (SDL_disabled_events[i]) {
slouken@4429
   104
            SDL_free(SDL_disabled_events[i]);
slouken@4429
   105
            SDL_disabled_events[i] = NULL;
slouken@4429
   106
        }
slouken@4429
   107
    }
slouken@5146
   108
slouken@5146
   109
    while (SDL_event_watchers) {
slouken@5146
   110
        SDL_EventWatcher *tmp = SDL_event_watchers;
slouken@5146
   111
        SDL_event_watchers = tmp->next;
slouken@5146
   112
        SDL_free(tmp);
slouken@5146
   113
    }
slouken@0
   114
}
slouken@0
   115
slouken@0
   116
/* This function (and associated calls) may be called more than once */
slouken@1895
   117
int
slouken@5123
   118
SDL_StartEventLoop(void)
slouken@0
   119
{
slouken@6588
   120
    /* We'll leave the event queue alone, since we might have gotten
slouken@6588
   121
       some important events at launch (like SDL_DROPFILE)
slouken@6588
   122
slouken@6588
   123
       FIXME: Does this introduce any other bugs with events at startup?
slouken@6588
   124
     */
slouken@0
   125
slouken@1895
   126
    /* No filter to start with, process most event types */
slouken@1895
   127
    SDL_EventOK = NULL;
slouken@4429
   128
    SDL_EventState(SDL_SYSWMEVENT, SDL_DISABLE);
slouken@0
   129
slouken@5123
   130
    /* Create the lock and set ourselves active */
slouken@5123
   131
#if !SDL_THREADS_DISABLED
slouken@6588
   132
    if (!SDL_EventQ.lock) {
slouken@6588
   133
        SDL_EventQ.lock = SDL_CreateMutex();
slouken@6588
   134
    }
slouken@5123
   135
    if (SDL_EventQ.lock == NULL) {
slouken@1895
   136
        return (-1);
slouken@1895
   137
    }
slouken@5123
   138
#endif /* !SDL_THREADS_DISABLED */
slouken@5123
   139
    SDL_EventQ.active = 1;
slouken@0
   140
slouken@1895
   141
    return (0);
slouken@0
   142
}
slouken@0
   143
slouken@0
   144
slouken@0
   145
/* Add an event to the event queue -- called with the queue locked */
slouken@1895
   146
static int
slouken@1895
   147
SDL_AddEvent(SDL_Event * event)
slouken@0
   148
{
slouken@1895
   149
    int tail, added;
slouken@0
   150
slouken@1895
   151
    tail = (SDL_EventQ.tail + 1) % MAXEVENTS;
slouken@1895
   152
    if (tail == SDL_EventQ.head) {
slouken@1895
   153
        /* Overflow, drop event */
slouken@1895
   154
        added = 0;
slouken@1895
   155
    } else {
slouken@1895
   156
        SDL_EventQ.event[SDL_EventQ.tail] = *event;
slouken@1895
   157
        if (event->type == SDL_SYSWMEVENT) {
slouken@1895
   158
            /* Note that it's possible to lose an event */
slouken@1895
   159
            int next = SDL_EventQ.wmmsg_next;
slouken@1895
   160
            SDL_EventQ.wmmsg[next] = *event->syswm.msg;
slouken@1895
   161
            SDL_EventQ.event[SDL_EventQ.tail].syswm.msg =
slouken@1895
   162
                &SDL_EventQ.wmmsg[next];
slouken@1895
   163
            SDL_EventQ.wmmsg_next = (next + 1) % MAXEVENTS;
slouken@1895
   164
        }
slouken@1895
   165
        SDL_EventQ.tail = tail;
slouken@1895
   166
        added = 1;
slouken@1895
   167
    }
slouken@1895
   168
    return (added);
slouken@0
   169
}
slouken@0
   170
slouken@0
   171
/* Cut an event, and return the next valid spot, or the tail */
slouken@0
   172
/*                           -- called with the queue locked */
slouken@1895
   173
static int
slouken@1895
   174
SDL_CutEvent(int spot)
slouken@0
   175
{
slouken@1895
   176
    if (spot == SDL_EventQ.head) {
slouken@1895
   177
        SDL_EventQ.head = (SDL_EventQ.head + 1) % MAXEVENTS;
slouken@1895
   178
        return (SDL_EventQ.head);
slouken@1895
   179
    } else if ((spot + 1) % MAXEVENTS == SDL_EventQ.tail) {
slouken@1895
   180
        SDL_EventQ.tail = spot;
slouken@1895
   181
        return (SDL_EventQ.tail);
slouken@1895
   182
    } else
slouken@1895
   183
        /* We cut the middle -- shift everything over */
slouken@1895
   184
    {
slouken@1895
   185
        int here, next;
slouken@0
   186
slouken@1895
   187
        /* This can probably be optimized with SDL_memcpy() -- careful! */
slouken@1895
   188
        if (--SDL_EventQ.tail < 0) {
slouken@1895
   189
            SDL_EventQ.tail = MAXEVENTS - 1;
slouken@1895
   190
        }
slouken@1895
   191
        for (here = spot; here != SDL_EventQ.tail; here = next) {
slouken@1895
   192
            next = (here + 1) % MAXEVENTS;
slouken@1895
   193
            SDL_EventQ.event[here] = SDL_EventQ.event[next];
slouken@1895
   194
        }
slouken@1895
   195
        return (spot);
slouken@1895
   196
    }
slouken@1895
   197
    /* NOTREACHED */
slouken@0
   198
}
slouken@0
   199
slouken@0
   200
/* Lock the event queue, take a peep at it, and unlock it */
slouken@1895
   201
int
slouken@1895
   202
SDL_PeepEvents(SDL_Event * events, int numevents, SDL_eventaction action,
slouken@4429
   203
               Uint32 minType, Uint32 maxType)
slouken@0
   204
{
slouken@1895
   205
    int i, used;
slouken@0
   206
slouken@1895
   207
    /* Don't look after we've quit */
slouken@1895
   208
    if (!SDL_EventQ.active) {
slouken@1895
   209
        return (-1);
slouken@1895
   210
    }
slouken@1895
   211
    /* Lock the event queue */
slouken@1895
   212
    used = 0;
slouken@6588
   213
    if (!SDL_EventQ.lock || SDL_mutexP(SDL_EventQ.lock) == 0) {
slouken@1895
   214
        if (action == SDL_ADDEVENT) {
slouken@1895
   215
            for (i = 0; i < numevents; ++i) {
slouken@1895
   216
                used += SDL_AddEvent(&events[i]);
slouken@1895
   217
            }
slouken@1895
   218
        } else {
slouken@1895
   219
            SDL_Event tmpevent;
slouken@1895
   220
            int spot;
slouken@0
   221
slouken@1895
   222
            /* If 'events' is NULL, just see if they exist */
slouken@1895
   223
            if (events == NULL) {
slouken@1895
   224
                action = SDL_PEEKEVENT;
slouken@1895
   225
                numevents = 1;
slouken@1895
   226
                events = &tmpevent;
slouken@1895
   227
            }
slouken@1895
   228
            spot = SDL_EventQ.head;
slouken@1895
   229
            while ((used < numevents) && (spot != SDL_EventQ.tail)) {
slouken@4429
   230
                Uint32 type = SDL_EventQ.event[spot].type;
slouken@4429
   231
                if (minType <= type && type <= maxType) {
slouken@1895
   232
                    events[used++] = SDL_EventQ.event[spot];
slouken@1895
   233
                    if (action == SDL_GETEVENT) {
slouken@1895
   234
                        spot = SDL_CutEvent(spot);
slouken@1895
   235
                    } else {
slouken@1895
   236
                        spot = (spot + 1) % MAXEVENTS;
slouken@1895
   237
                    }
slouken@1895
   238
                } else {
slouken@1895
   239
                    spot = (spot + 1) % MAXEVENTS;
slouken@1895
   240
                }
slouken@1895
   241
            }
slouken@1895
   242
        }
slouken@1895
   243
        SDL_mutexV(SDL_EventQ.lock);
slouken@1895
   244
    } else {
slouken@1895
   245
        SDL_SetError("Couldn't lock event queue");
slouken@1895
   246
        used = -1;
slouken@1895
   247
    }
slouken@1895
   248
    return (used);
slouken@1895
   249
}
slouken@1895
   250
slouken@1895
   251
SDL_bool
slouken@4429
   252
SDL_HasEvent(Uint32 type)
slouken@1895
   253
{
slouken@4429
   254
    return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, type, type) > 0);
slouken@4429
   255
}
slouken@4429
   256
slouken@4429
   257
SDL_bool
slouken@4429
   258
SDL_HasEvents(Uint32 minType, Uint32 maxType)
slouken@4429
   259
{
slouken@4429
   260
    return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, minType, maxType) > 0);
slouken@4429
   261
}
slouken@4429
   262
slouken@4429
   263
void
slouken@4429
   264
SDL_FlushEvent(Uint32 type)
slouken@4429
   265
{
slouken@4429
   266
    SDL_FlushEvents(type, type);
slouken@4429
   267
}
slouken@4429
   268
slouken@4429
   269
void
slouken@4429
   270
SDL_FlushEvents(Uint32 minType, Uint32 maxType)
slouken@4429
   271
{
slouken@4429
   272
    /* Don't look after we've quit */
slouken@4429
   273
    if (!SDL_EventQ.active) {
slouken@4429
   274
        return;
slouken@4429
   275
    }
slouken@4429
   276
slouken@4460
   277
    /* Make sure the events are current */
slouken@5293
   278
#if 0
slouken@5293
   279
    /* Actually, we can't do this since we might be flushing while processing
slouken@5293
   280
       a resize event, and calling this might trigger further resize events.
slouken@5293
   281
    */
slouken@4460
   282
    SDL_PumpEvents();
slouken@5293
   283
#endif
slouken@4460
   284
slouken@4429
   285
    /* Lock the event queue */
slouken@4429
   286
    if (SDL_mutexP(SDL_EventQ.lock) == 0) {
slouken@4429
   287
        int spot = SDL_EventQ.head;
slouken@4429
   288
        while (spot != SDL_EventQ.tail) {
slouken@4429
   289
            Uint32 type = SDL_EventQ.event[spot].type;
slouken@4429
   290
            if (minType <= type && type <= maxType) {
slouken@4429
   291
                spot = SDL_CutEvent(spot);
slouken@4429
   292
            } else {
slouken@4429
   293
                spot = (spot + 1) % MAXEVENTS;
slouken@4429
   294
            }
slouken@4429
   295
        }
slouken@4429
   296
        SDL_mutexV(SDL_EventQ.lock);
slouken@4429
   297
    }
slouken@0
   298
}
slouken@0
   299
slouken@0
   300
/* Run the system dependent event loops */
slouken@1895
   301
void
slouken@1895
   302
SDL_PumpEvents(void)
slouken@0
   303
{
slouken@5123
   304
    SDL_VideoDevice *_this = SDL_GetVideoDevice();
slouken@0
   305
slouken@5123
   306
    /* Get events from the video subsystem */
slouken@5123
   307
    if (_this) {
slouken@5123
   308
        _this->PumpEvents(_this);
slouken@5123
   309
    }
slouken@1361
   310
#if !SDL_JOYSTICK_DISABLED
slouken@5123
   311
    /* Check for joystick state change */
slouken@5123
   312
    if (SDL_ShouldPollJoystick()) {
slouken@5123
   313
        SDL_JoystickUpdate();
slouken@5123
   314
    }
slouken@0
   315
#endif
slouken@0
   316
}
slouken@0
   317
slouken@0
   318
/* Public functions */
slouken@0
   319
slouken@1895
   320
int
slouken@1895
   321
SDL_PollEvent(SDL_Event * event)
slouken@0
   322
{
slouken@3072
   323
    return SDL_WaitEventTimeout(event, 0);
slouken@0
   324
}
slouken@0
   325
slouken@1895
   326
int
slouken@1895
   327
SDL_WaitEvent(SDL_Event * event)
slouken@0
   328
{
slouken@3072
   329
    return SDL_WaitEventTimeout(event, -1);
slouken@3072
   330
}
slouken@3072
   331
slouken@3072
   332
int
slouken@3072
   333
SDL_WaitEventTimeout(SDL_Event * event, int timeout)
slouken@3072
   334
{
slouken@3072
   335
    Uint32 expiration = 0;
slouken@3072
   336
slouken@3072
   337
    if (timeout > 0)
slouken@3072
   338
        expiration = SDL_GetTicks() + timeout;
slouken@3072
   339
slouken@3072
   340
    for (;;) {
slouken@1895
   341
        SDL_PumpEvents();
slouken@4429
   342
        switch (SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_FIRSTEVENT, SDL_LASTEVENT)) {
slouken@1895
   343
        case -1:
slouken@1895
   344
            return 0;
slouken@1895
   345
        case 1:
slouken@1895
   346
            return 1;
slouken@1895
   347
        case 0:
slouken@3072
   348
            if (timeout == 0) {
slouken@3072
   349
                /* Polling and no events, just return */
slouken@3072
   350
                return 0;
slouken@3072
   351
            }
slouken@3072
   352
            if (timeout > 0 && ((int) (SDL_GetTicks() - expiration) >= 0)) {
slouken@3072
   353
                /* Timeout expired and no events */
slouken@3072
   354
                return 0;
slouken@3072
   355
            }
slouken@1895
   356
            SDL_Delay(10);
slouken@3072
   357
            break;
slouken@1895
   358
        }
slouken@1895
   359
    }
slouken@0
   360
}
slouken@0
   361
slouken@1895
   362
int
slouken@1895
   363
SDL_PushEvent(SDL_Event * event)
slouken@0
   364
{
slouken@5146
   365
    SDL_EventWatcher *curr;
slouken@6114
   366
    event->window.timestamp = SDL_GetTicks();
slouken@1895
   367
    if (SDL_EventOK && !SDL_EventOK(SDL_EventOKParam, event)) {
slouken@1895
   368
        return 0;
slouken@1895
   369
    }
slouken@5146
   370
slouken@5146
   371
    for (curr = SDL_event_watchers; curr; curr = curr->next) {
slouken@5146
   372
        curr->callback(curr->userdata, event);
slouken@5146
   373
    }
slouken@5146
   374
slouken@4429
   375
    if (SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0, 0) <= 0) {
slouken@1895
   376
        return -1;
slouken@1895
   377
    }
jim@4657
   378
jim@4657
   379
    SDL_GestureProcessEvent(event);
jim@4657
   380
slouken@1895
   381
    return 1;
slouken@0
   382
}
slouken@0
   383
slouken@1895
   384
void
slouken@1895
   385
SDL_SetEventFilter(SDL_EventFilter filter, void *userdata)
slouken@0
   386
{
slouken@1895
   387
    SDL_Event bitbucket;
slouken@0
   388
slouken@1895
   389
    /* Set filter and discard pending events */
slouken@1895
   390
    SDL_EventOK = filter;
slouken@1895
   391
    SDL_EventOKParam = userdata;
slouken@1895
   392
    while (SDL_PollEvent(&bitbucket) > 0);
slouken@0
   393
}
slouken@0
   394
slouken@1895
   395
SDL_bool
slouken@1895
   396
SDL_GetEventFilter(SDL_EventFilter * filter, void **userdata)
slouken@0
   397
{
slouken@1895
   398
    if (filter) {
slouken@1895
   399
        *filter = SDL_EventOK;
slouken@1895
   400
    }
slouken@1895
   401
    if (userdata) {
slouken@1895
   402
        *userdata = SDL_EventOKParam;
slouken@1895
   403
    }
slouken@1895
   404
    return SDL_EventOK ? SDL_TRUE : SDL_FALSE;
slouken@0
   405
}
slouken@0
   406
slouken@5146
   407
/* FIXME: This is not thread-safe yet */
slouken@5146
   408
void
slouken@5146
   409
SDL_AddEventWatch(SDL_EventFilter filter, void *userdata)
slouken@5146
   410
{
slouken@5146
   411
    SDL_EventWatcher *watcher;
slouken@5146
   412
slouken@5146
   413
    watcher = (SDL_EventWatcher *)SDL_malloc(sizeof(*watcher));
slouken@5146
   414
    if (!watcher) {
slouken@5146
   415
        /* Uh oh... */
slouken@5146
   416
        return;
slouken@5146
   417
    }
slouken@5146
   418
    watcher->callback = filter;
slouken@5146
   419
    watcher->userdata = userdata;
slouken@5146
   420
    watcher->next = SDL_event_watchers;
slouken@5146
   421
    SDL_event_watchers = watcher;
slouken@5146
   422
}
slouken@5146
   423
slouken@5146
   424
/* FIXME: This is not thread-safe yet */
slouken@5146
   425
void
slouken@5146
   426
SDL_DelEventWatch(SDL_EventFilter filter, void *userdata)
slouken@5146
   427
{
slouken@5146
   428
    SDL_EventWatcher *prev = NULL;
slouken@5146
   429
    SDL_EventWatcher *curr;
slouken@5146
   430
slouken@5146
   431
    for (curr = SDL_event_watchers; curr; prev = curr, curr = curr->next) {
slouken@5146
   432
        if (curr->callback == filter && curr->userdata == userdata) {
slouken@5146
   433
            if (prev) {
slouken@5146
   434
                prev->next = curr->next;
slouken@5146
   435
            } else {
slouken@5146
   436
                SDL_event_watchers = curr->next;
slouken@5146
   437
            }
slouken@5146
   438
            SDL_free(curr);
slouken@5146
   439
            break;
slouken@5146
   440
        }
slouken@5146
   441
    }
slouken@5146
   442
}
slouken@5146
   443
slouken@1895
   444
void
slouken@1895
   445
SDL_FilterEvents(SDL_EventFilter filter, void *userdata)
slouken@0
   446
{
slouken@1895
   447
    if (SDL_mutexP(SDL_EventQ.lock) == 0) {
slouken@1895
   448
        int spot;
slouken@0
   449
slouken@1895
   450
        spot = SDL_EventQ.head;
slouken@1895
   451
        while (spot != SDL_EventQ.tail) {
slouken@1895
   452
            if (filter(userdata, &SDL_EventQ.event[spot])) {
slouken@1895
   453
                spot = (spot + 1) % MAXEVENTS;
slouken@1895
   454
            } else {
slouken@1895
   455
                spot = SDL_CutEvent(spot);
slouken@1895
   456
            }
slouken@1895
   457
        }
slouken@1895
   458
    }
slouken@1895
   459
    SDL_mutexV(SDL_EventQ.lock);
slouken@1895
   460
}
slouken@0
   461
slouken@1895
   462
Uint8
slouken@4429
   463
SDL_EventState(Uint32 type, int state)
slouken@1895
   464
{
slouken@1895
   465
    Uint8 current_state;
slouken@4429
   466
    Uint8 hi = ((type >> 8) & 0xff);
slouken@4429
   467
    Uint8 lo = (type & 0xff);
slouken@1895
   468
slouken@4429
   469
    if (SDL_disabled_events[hi] &&
slouken@4429
   470
        (SDL_disabled_events[hi]->bits[lo/32] & (1 << (lo&31)))) {
slouken@4429
   471
        current_state = SDL_DISABLE;
slouken@4429
   472
    } else {
slouken@4429
   473
        current_state = SDL_ENABLE;
slouken@1895
   474
    }
slouken@1895
   475
slouken@4429
   476
    if (state != current_state)
slouken@4429
   477
    {
slouken@4429
   478
        switch (state) {
slouken@4429
   479
        case SDL_DISABLE:
slouken@4429
   480
            /* Disable this event type and discard pending events */
slouken@4429
   481
            if (!SDL_disabled_events[hi]) {
slouken@4429
   482
                SDL_disabled_events[hi] = (SDL_DisabledEventBlock*) SDL_calloc(1, sizeof(SDL_DisabledEventBlock));
slouken@4429
   483
                if (!SDL_disabled_events[hi]) {
slouken@4429
   484
                    /* Out of memory, nothing we can do... */
slouken@4429
   485
                    break;
slouken@4429
   486
                }
slouken@4429
   487
            }
slouken@4429
   488
            SDL_disabled_events[hi]->bits[lo/32] |= (1 << (lo&31));
slouken@4429
   489
            SDL_FlushEvent(type);
slouken@4429
   490
            break;
slouken@4429
   491
        case SDL_ENABLE:
slouken@4429
   492
            SDL_disabled_events[hi]->bits[lo/32] &= ~(1 << (lo&31));
slouken@4429
   493
            break;
slouken@4429
   494
        default:
slouken@4429
   495
            /* Querying state... */
slouken@4429
   496
            break;
slouken@1895
   497
        }
slouken@1895
   498
    }
slouken@4429
   499
slouken@4429
   500
    return current_state;
slouken@4429
   501
}
slouken@4429
   502
slouken@4429
   503
Uint32
slouken@4429
   504
SDL_RegisterEvents(int numevents)
slouken@4429
   505
{
slouken@4429
   506
    Uint32 event_base;
slouken@4429
   507
slouken@4429
   508
    if (SDL_userevents+numevents <= SDL_LASTEVENT) {
slouken@4429
   509
        event_base = SDL_userevents;
slouken@4429
   510
        SDL_userevents += numevents;
slouken@4429
   511
    } else {
slouken@4429
   512
        event_base = (Uint32)-1;
slouken@4429
   513
    }
slouken@4429
   514
    return event_base;
slouken@0
   515
}
slouken@0
   516
slouken@0
   517
/* This is a generic event handler.
slouken@0
   518
 */
slouken@1895
   519
int
slouken@1895
   520
SDL_SendSysWMEvent(SDL_SysWMmsg * message)
slouken@0
   521
{
slouken@1895
   522
    int posted;
slouken@0
   523
slouken@1895
   524
    posted = 0;
slouken@4429
   525
    if (SDL_GetEventState(SDL_SYSWMEVENT) == SDL_ENABLE) {
slouken@1895
   526
        SDL_Event event;
slouken@1895
   527
        SDL_memset(&event, 0, sizeof(event));
slouken@1895
   528
        event.type = SDL_SYSWMEVENT;
slouken@1895
   529
        event.syswm.msg = message;
slouken@1895
   530
        posted = (SDL_PushEvent(&event) > 0);
slouken@1895
   531
    }
slouken@1895
   532
    /* Update internal event state */
slouken@1895
   533
    return (posted);
slouken@0
   534
}
slouken@1895
   535
slouken@1895
   536
/* vi: set ts=4 sw=4 expandtab: */