This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL.c
471 lines (410 loc) · 11.8 KB
1
2
/*
Simple DirectMedia Layer
3
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"
/* Initialization code for SDL */
#include "SDL.h"
26
#include "SDL_bits.h"
27
28
#include "SDL_revision.h"
#include "SDL_assert_c.h"
29
#include "events/SDL_events_c.h"
30
31
32
33
34
35
36
#include "haptic/SDL_haptic_c.h"
#include "joystick/SDL_joystick_c.h"
/* Initialization/Cleanup routines */
#if !SDL_TIMERS_DISABLED
extern int SDL_TimerInit(void);
extern void SDL_TimerQuit(void);
37
extern void SDL_InitTicks(void);
38
#endif
39
#if SDL_VIDEO_DRIVER_WINDOWS
40
41
42
43
44
45
extern int SDL_HelperWindowCreate(void);
extern int SDL_HelperWindowDestroy(void);
#endif
/* The initialized subsystems */
46
47
48
49
50
#ifdef SDL_MAIN_NEEDED
static SDL_bool SDL_MainIsReady = SDL_FALSE;
#else
static SDL_bool SDL_MainIsReady = SDL_TRUE;
#endif
51
static SDL_bool SDL_bInMainQuit = SDL_FALSE;
52
static Uint8 SDL_SubsystemRefCount[ 32 ];
53
54
/* Private helper to increment a subsystem's ref counter. */
55
56
static void
SDL_PrivateSubsystemRefCountIncr(Uint32 subsystem)
57
{
58
59
60
61
62
63
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);
++SDL_SubsystemRefCount[subsystem_index];
}
/* Private helper to decrement a subsystem's ref counter. */
64
65
static void
SDL_PrivateSubsystemRefCountDecr(Uint32 subsystem)
66
67
68
69
70
71
72
73
74
{
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
if (SDL_SubsystemRefCount[subsystem_index] > 0) {
--SDL_SubsystemRefCount[subsystem_index];
}
}
/* Private helper to check if a system needs init. */
static SDL_bool
75
SDL_PrivateShouldInitSubsystem(Uint32 subsystem)
76
{
77
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
78
79
80
SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);
return (SDL_SubsystemRefCount[subsystem_index] == 0);
}
81
82
83
84
85
86
87
88
89
90
91
92
93
/* Private helper to check if a system needs to be quit. */
static SDL_bool
SDL_PrivateShouldQuitSubsystem(Uint32 subsystem) {
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
if (SDL_SubsystemRefCount[subsystem_index] == 0) {
return SDL_FALSE;
}
/* If we're in SDL_Quit, we shut down every subsystem, even if refcount
* isn't zero.
*/
return SDL_SubsystemRefCount[subsystem_index] == 1 || SDL_bInMainQuit;
94
}
95
96
97
98
99
100
101
void
SDL_SetMainReady(void)
{
SDL_MainIsReady = SDL_TRUE;
}
102
103
104
int
SDL_InitSubSystem(Uint32 flags)
{
105
106
107
108
109
if (!SDL_MainIsReady) {
SDL_SetError("Application didn't initialize properly, did you include SDL_main.h in the file containing your main() function?");
return -1;
}
110
#if !SDL_TIMERS_DISABLED
111
SDL_InitTicks();
112
#endif
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
if ((flags & SDL_INIT_GAMECONTROLLER)) {
/* game controller implies joystick */
flags |= SDL_INIT_JOYSTICK;
}
if ((flags & (SDL_INIT_VIDEO|SDL_INIT_JOYSTICK))) {
/* video or joystick implies events */
flags |= SDL_INIT_EVENTS;
}
/* Initialize the event subsystem */
if ((flags & SDL_INIT_EVENTS)) {
#if !SDL_EVENTS_DISABLED
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_EVENTS)) {
if (SDL_StartEventLoop() < 0) {
return (-1);
}
SDL_QuitInit();
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_EVENTS);
#else
return SDL_SetError("SDL not built with events support");
#endif
}
139
/* Initialize the timer subsystem */
140
if ((flags & SDL_INIT_TIMER)){
141
#if !SDL_TIMERS_DISABLED
142
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_TIMER)) {
143
144
145
if (SDL_TimerInit() < 0) {
return (-1);
}
146
147
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_TIMER);
148
#else
149
return SDL_SetError("SDL not built with timer support");
150
#endif
151
}
152
153
154
/* Initialize the video subsystem */
if ((flags & SDL_INIT_VIDEO)){
155
#if !SDL_VIDEO_DISABLED
156
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_VIDEO)) {
157
158
159
if (SDL_VideoInit(NULL) < 0) {
return (-1);
}
160
161
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_VIDEO);
162
#else
163
return SDL_SetError("SDL not built with video support");
164
#endif
165
}
166
167
/* Initialize the audio subsystem */
168
if ((flags & SDL_INIT_AUDIO)){
169
#if !SDL_AUDIO_DISABLED
170
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_AUDIO)) {
171
172
173
if (SDL_AudioInit(NULL) < 0) {
return (-1);
}
174
175
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_AUDIO);
176
#else
177
return SDL_SetError("SDL not built with audio support");
178
#endif
179
180
}
181
/* Initialize the joystick subsystem */
182
if ((flags & SDL_INIT_JOYSTICK)){
183
#if !SDL_JOYSTICK_DISABLED
184
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_JOYSTICK)) {
185
186
187
if (SDL_JoystickInit() < 0) {
return (-1);
}
188
}
189
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_JOYSTICK);
190
#else
191
return SDL_SetError("SDL not built with joystick support");
192
#endif
193
}
194
195
if ((flags & SDL_INIT_GAMECONTROLLER)){
196
#if !SDL_JOYSTICK_DISABLED
197
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_GAMECONTROLLER)) {
198
199
200
if (SDL_GameControllerInit() < 0) {
return (-1);
}
201
202
203
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_GAMECONTROLLER);
#else
204
return SDL_SetError("SDL not built with joystick support");
205
#endif
206
}
207
208
/* Initialize the haptic subsystem */
209
if ((flags & SDL_INIT_HAPTIC)){
210
#if !SDL_HAPTIC_DISABLED
211
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_HAPTIC)) {
212
if (SDL_HapticInit() < 0) {
213
214
return (-1);
}
215
216
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_HAPTIC);
217
#else
218
return SDL_SetError("SDL not built with haptic (force feedback) support");
219
#endif
220
221
}
222
223
224
225
226
227
228
229
230
return (0);
}
int
SDL_Init(Uint32 flags)
{
/* Clear the error message */
SDL_ClearError();
231
#if SDL_VIDEO_DRIVER_WINDOWS
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
if (SDL_HelperWindowCreate() < 0) {
return -1;
}
#endif
/* Initialize the desired subsystems */
if (SDL_InitSubSystem(flags) < 0) {
return (-1);
}
return (0);
}
void
SDL_QuitSubSystem(Uint32 flags)
{
/* Shut down requested initialized subsystems */
#if !SDL_JOYSTICK_DISABLED
250
if ((flags & SDL_INIT_GAMECONTROLLER)) {
251
/* game controller implies joystick */
252
253
254
255
flags |= SDL_INIT_JOYSTICK;
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_GAMECONTROLLER)) {
SDL_GameControllerQuit();
256
}
257
258
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_GAMECONTROLLER);
}
259
260
if ((flags & SDL_INIT_JOYSTICK)) {
261
262
263
/* joystick implies events */
flags |= SDL_INIT_EVENTS;
264
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_JOYSTICK)) {
265
266
SDL_JoystickQuit();
}
267
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_JOYSTICK);
268
269
}
#endif
270
271
#if !SDL_HAPTIC_DISABLED
272
273
if ((flags & SDL_INIT_HAPTIC)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_HAPTIC)) {
274
275
SDL_HapticQuit();
}
276
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_HAPTIC);
277
278
}
#endif
279
280
#if !SDL_AUDIO_DISABLED
281
282
if ((flags & SDL_INIT_AUDIO)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_AUDIO)) {
283
284
SDL_AudioQuit();
}
285
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_AUDIO);
286
287
}
#endif
288
289
#if !SDL_VIDEO_DISABLED
290
if ((flags & SDL_INIT_VIDEO)) {
291
292
293
/* video implies events */
flags |= SDL_INIT_EVENTS;
294
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_VIDEO)) {
295
296
SDL_VideoQuit();
}
297
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_VIDEO);
298
299
}
#endif
300
301
#if !SDL_TIMERS_DISABLED
302
303
if ((flags & SDL_INIT_TIMER)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_TIMER)) {
304
305
SDL_TimerQuit();
}
306
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_TIMER);
307
308
}
#endif
309
310
311
312
313
314
315
316
317
318
#if !SDL_EVENTS_DISABLED
if ((flags & SDL_INIT_EVENTS)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_EVENTS)) {
SDL_QuitQuit();
SDL_StopEventLoop();
}
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_EVENTS);
}
#endif
319
320
321
322
323
}
Uint32
SDL_WasInit(Uint32 flags)
{
324
325
326
327
int i;
int num_subsystems = SDL_arraysize(SDL_SubsystemRefCount);
Uint32 initialized = 0;
328
329
330
if (!flags) {
flags = SDL_INIT_EVERYTHING;
}
331
332
333
334
335
336
337
338
339
340
341
342
343
num_subsystems = SDL_min(num_subsystems, SDL_MostSignificantBitIndex32(flags) + 1);
/* Iterate over each bit in flags, and check the matching subsystem. */
for (i = 0; i < num_subsystems; ++i) {
if ((flags & 1) && SDL_SubsystemRefCount[i] > 0) {
initialized |= (1 << i);
}
flags >>= 1;
}
return initialized;
344
345
346
347
348
}
void
SDL_Quit(void)
{
349
350
SDL_bInMainQuit = SDL_TRUE;
351
/* Quit all subsystems */
352
#if SDL_VIDEO_DRIVER_WINDOWS
353
354
355
356
357
358
359
360
361
362
SDL_HelperWindowDestroy();
#endif
SDL_QuitSubSystem(SDL_INIT_EVERYTHING);
/* Uninstall any parachute signal handlers */
SDL_UninstallParachute();
SDL_ClearHints();
SDL_AssertionsQuit();
SDL_LogResetPriorities();
363
364
365
366
367
368
369
/* Now that every subsystem has been quit, we reset the subsystem refcount
* and the list of initialized subsystems.
*/
SDL_memset( SDL_SubsystemRefCount, 0x0, sizeof(SDL_SubsystemRefCount) );
SDL_bInMainQuit = SDL_FALSE;
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
}
/* Get the library version number */
void
SDL_GetVersion(SDL_version * ver)
{
SDL_VERSION(ver);
}
/* Get the library source revision */
const char *
SDL_GetRevision(void)
{
return SDL_REVISION;
}
/* Get the library source revision number */
int
SDL_GetRevisionNumber(void)
{
return SDL_REVISION_NUMBER;
}
/* Get the name of the platform */
const char *
SDL_GetPlatform()
{
#if __AIX__
return "AIX";
#elif __ANDROID__
return "Android";
#elif __BEOS__
return "BeOS";
#elif __BSDI__
return "BSDI";
#elif __DREAMCAST__
return "Dreamcast";
#elif __FREEBSD__
return "FreeBSD";
409
410
#elif __HAIKU__
return "Haiku";
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
#elif __HPUX__
return "HP-UX";
#elif __IRIX__
return "Irix";
#elif __LINUX__
return "Linux";
#elif __MINT__
return "Atari MiNT";
#elif __MACOS__
return "MacOS Classic";
#elif __MACOSX__
return "Mac OS X";
#elif __NETBSD__
return "NetBSD";
#elif __OPENBSD__
return "OpenBSD";
#elif __OS2__
return "OS/2";
#elif __OSF__
return "OSF/1";
#elif __QNXNTO__
return "QNX Neutrino";
#elif __RISCOS__
return "RISC OS";
#elif __SOLARIS__
return "Solaris";
#elif __WIN32__
return "Windows";
#elif __IPHONEOS__
return "iPhone OS";
441
442
#elif __PSP__
return "PlayStation Portable";
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
#else
return "Unknown (see SDL_platform.h)";
#endif
}
#if defined(__WIN32__)
#if !defined(HAVE_LIBC) || (defined(__WATCOMC__) && defined(BUILD_DLL))
/* Need to include DllMain() on Watcom C for some reason.. */
#include "core/windows/SDL_windows.h"
BOOL APIENTRY
_DllMainCRTStartup(HANDLE hModule,
DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call) {
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
#endif /* building DLL with Watcom C */
#endif /* __WIN32__ */
471
/* vi: set sts=4 ts=4 sw=4 expandtab: */