This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL.c
433 lines (377 loc) · 10.7 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
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
#include "SDL_revision.h"
#include "SDL_fatal.h"
#include "SDL_assert_c.h"
#include "haptic/SDL_haptic_c.h"
#include "joystick/SDL_joystick_c.h"
/* Initialization/Cleanup routines */
#if !SDL_TIMERS_DISABLED
extern void SDL_StartTicks(void);
extern int SDL_TimerInit(void);
extern void SDL_TimerQuit(void);
#endif
#if defined(__WIN32__)
extern int SDL_HelperWindowCreate(void);
extern int SDL_HelperWindowDestroy(void);
#endif
/* The initialized subsystems */
static Uint32 ticks_started = 0;
47
static SDL_bool SDL_bInMainQuit = SDL_FALSE;
48
static Uint8 SDL_SubsystemRefCount[ 32 ];
49
50
/* Private helper to increment a subsystem's ref counter. */
51
52
static void
SDL_PrivateSubsystemRefCountIncr(Uint32 subsystem)
53
{
54
55
56
57
58
59
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. */
60
61
static void
SDL_PrivateSubsystemRefCountDecr(Uint32 subsystem)
62
63
64
65
66
67
68
69
70
{
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
71
SDL_PrivateShouldInitSubsystem(Uint32 subsystem)
72
{
73
int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
74
75
76
SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);
return (SDL_SubsystemRefCount[subsystem_index] == 0);
}
77
78
79
80
81
82
83
84
85
86
87
88
89
/* 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;
90
}
91
92
93
94
95
96
97
98
99
int
SDL_InitSubSystem(Uint32 flags)
{
#if !SDL_TIMERS_DISABLED
if (!ticks_started) {
SDL_StartTicks();
ticks_started = 1;
}
100
#endif
101
102
/* Initialize the timer subsystem */
103
if ((flags & SDL_INIT_TIMER) ){
104
#if !SDL_TIMERS_DISABLED
105
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_TIMER)) {
106
107
108
if (SDL_TimerInit() < 0) {
return (-1);
}
109
110
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_TIMER);
111
#else
112
return SDL_SetError("SDL not built with timer support");
113
#endif
114
}
115
116
/* Initialize the video/event subsystem */
117
if ((flags & SDL_INIT_VIDEO) ){
118
#if !SDL_VIDEO_DISABLED
119
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_VIDEO)) {
120
121
122
if (SDL_VideoInit(NULL) < 0) {
return (-1);
}
123
124
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_VIDEO);
125
#else
126
return SDL_SetError("SDL not built with video support");
127
#endif
128
}
129
130
/* Initialize the audio subsystem */
131
if ((flags & SDL_INIT_AUDIO) ){
132
#if !SDL_AUDIO_DISABLED
133
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_AUDIO)) {
134
135
136
if (SDL_AudioInit(NULL) < 0) {
return (-1);
}
137
138
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_AUDIO);
139
#else
140
return SDL_SetError("SDL not built with audio support");
141
#endif
142
143
144
145
146
147
}
if ((flags & SDL_INIT_GAMECONTROLLER)) {
// Game controller implies Joystick.
flags |= SDL_INIT_JOYSTICK;
}
148
149
/* Initialize the joystick subsystem */
150
if ((flags & SDL_INIT_JOYSTICK) ){
151
#if !SDL_JOYSTICK_DISABLED
152
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_JOYSTICK)) {
153
154
155
if (SDL_JoystickInit() < 0) {
return (-1);
}
156
}
157
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_JOYSTICK);
158
#else
159
return SDL_SetError("SDL not built with joystick support");
160
#endif
161
}
162
163
if ((flags & SDL_INIT_GAMECONTROLLER) ){
164
#if !SDL_JOYSTICK_DISABLED
165
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_GAMECONTROLLER)) {
166
167
168
if (SDL_GameControllerInit() < 0) {
return (-1);
}
169
170
171
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_GAMECONTROLLER);
#else
172
return SDL_SetError("SDL not built with joystick support");
173
#endif
174
}
175
176
/* Initialize the haptic subsystem */
177
if ((flags & SDL_INIT_HAPTIC) ){
178
#if !SDL_HAPTIC_DISABLED
179
if (SDL_PrivateShouldInitSubsystem(SDL_INIT_HAPTIC)) {
180
if (SDL_HapticInit() < 0) {
181
182
return (-1);
}
183
184
}
SDL_PrivateSubsystemRefCountIncr(SDL_INIT_HAPTIC);
185
#else
186
return SDL_SetError("SDL not built with haptic (force feedback) support");
187
#endif
188
189
}
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
return (0);
}
int
SDL_Init(Uint32 flags)
{
if (SDL_AssertionsInit() < 0) {
return -1;
}
/* Clear the error message */
SDL_ClearError();
#if defined(__WIN32__)
if (SDL_HelperWindowCreate() < 0) {
return -1;
}
#endif
/* Initialize the desired subsystems */
if (SDL_InitSubSystem(flags) < 0) {
return (-1);
}
/* Everything is initialized */
if (!(flags & SDL_INIT_NOPARACHUTE)) {
SDL_InstallParachute();
}
return (0);
}
void
SDL_QuitSubSystem(Uint32 flags)
{
/* Shut down requested initialized subsystems */
#if !SDL_JOYSTICK_DISABLED
227
228
229
230
231
232
if ((flags & SDL_INIT_GAMECONTROLLER)) {
// Game controller implies Joystick.
flags |= SDL_INIT_JOYSTICK;
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_GAMECONTROLLER)) {
SDL_GameControllerQuit();
233
}
234
235
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_GAMECONTROLLER);
}
236
237
238
if ((flags & SDL_INIT_JOYSTICK)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_JOYSTICK)) {
239
240
SDL_JoystickQuit();
}
241
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_JOYSTICK);
242
243
}
#endif
244
245
#if !SDL_HAPTIC_DISABLED
246
247
if ((flags & SDL_INIT_HAPTIC)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_HAPTIC)) {
248
249
SDL_HapticQuit();
}
250
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_HAPTIC);
251
252
}
#endif
253
254
#if !SDL_AUDIO_DISABLED
255
256
if ((flags & SDL_INIT_AUDIO)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_AUDIO)) {
257
258
SDL_AudioQuit();
}
259
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_AUDIO);
260
261
}
#endif
262
263
#if !SDL_VIDEO_DISABLED
264
265
if ((flags & SDL_INIT_VIDEO)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_VIDEO)) {
266
267
SDL_VideoQuit();
}
268
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_VIDEO);
269
270
}
#endif
271
272
#if !SDL_TIMERS_DISABLED
273
274
if ((flags & SDL_INIT_TIMER)) {
if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_TIMER)) {
275
276
SDL_TimerQuit();
}
277
SDL_PrivateSubsystemRefCountDecr(SDL_INIT_TIMER);
278
279
280
281
282
283
284
}
#endif
}
Uint32
SDL_WasInit(Uint32 flags)
{
285
286
287
288
int i;
int num_subsystems = SDL_arraysize(SDL_SubsystemRefCount);
Uint32 initialized = 0;
289
290
291
if (!flags) {
flags = SDL_INIT_EVERYTHING;
}
292
293
294
295
296
297
298
299
300
301
302
303
304
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;
305
306
307
308
309
}
void
SDL_Quit(void)
{
310
311
SDL_bInMainQuit = SDL_TRUE;
312
313
314
315
316
317
318
319
320
321
322
323
/* Quit all subsystems */
#if defined(__WIN32__)
SDL_HelperWindowDestroy();
#endif
SDL_QuitSubSystem(SDL_INIT_EVERYTHING);
/* Uninstall any parachute signal handlers */
SDL_UninstallParachute();
SDL_ClearHints();
SDL_AssertionsQuit();
SDL_LogResetPriorities();
324
325
326
327
328
329
330
/* 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;
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
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
}
/* 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 __HAIKU__
/* Haiku must appear here before BeOS, since it also defines __BEOS__ */
return "Haiku";
#elif __BEOS__
return "BeOS";
#elif __BSDI__
return "BSDI";
#elif __DREAMCAST__
return "Dreamcast";
#elif __FREEBSD__
return "FreeBSD";
#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";
403
404
#elif __PSP__
return "PlayStation Portable";
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
#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__ */
433
/* vi: set sts=4 ts=4 sw=4 expandtab: */