1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21
22/**
23 * # CategorySystem
24 *
25 * Platform-specific SDL API functions. These are functions that deal with
26 * needs of specific operating systems, that didn't make sense to offer as
27 * platform-independent, generic APIs.
28 *
29 * Most apps can make do without these functions, but they can be useful for
30 * integrating with other parts of a specific system, adding platform-specific
31 * polish to an app, or solving problems that only affect one target.
32 */
33
34#ifndef SDL_system_h_
35#define SDL_system_h_
36
37#include <SDL3/SDL_stdinc.h>
38#include <SDL3/SDL_error.h>
39#include <SDL3/SDL_keyboard.h>
40#include <SDL3/SDL_video.h>
41
42#include <SDL3/SDL_begin_code.h>
43/* Set up for C function definitions, even when using C++ */
44#ifdef __cplusplus
45extern "C" {
46#endif
47
48
49/*
50 * Platform specific functions for Windows
51 */
52#if defined(SDL_PLATFORM_WINDOWS)
53
54typedef struct tagMSG MSG;
55
56/**
57 * A callback to be used with SDL_SetWindowsMessageHook.
58 *
59 * This callback may modify the message, and should return true if the message
60 * should continue to be processed, or false to prevent further processing.
61 *
62 * As this is processing a message directly from the Windows event loop, this
63 * callback should do the minimum required work and return quickly.
64 *
65 * \param userdata the app-defined pointer provided to
66 * SDL_SetWindowsMessageHook.
67 * \param msg a pointer to a Win32 event structure to process.
68 * \returns true to let event continue on, false to drop it.
69 *
70 * \threadsafety This may only be called (by SDL) from the thread handling the
71 * Windows event loop.
72 *
73 * \since This datatype is available since SDL 3.2.0.
74 *
75 * \sa SDL_SetWindowsMessageHook
76 * \sa SDL_HINT_WINDOWS_ENABLE_MESSAGELOOP
77 */
78typedef bool (SDLCALL *SDL_WindowsMessageHook)(void *userdata, MSG *msg);
79
80/**
81 * Set a callback for every Windows message, run before TranslateMessage().
82 *
83 * The callback may modify the message, and should return true if the message
84 * should continue to be processed, or false to prevent further processing.
85 *
86 * \param callback the SDL_WindowsMessageHook function to call.
87 * \param userdata a pointer to pass to every iteration of `callback`.
88 *
89 * \since This function is available since SDL 3.2.0.
90 *
91 * \sa SDL_WindowsMessageHook
92 * \sa SDL_HINT_WINDOWS_ENABLE_MESSAGELOOP
93 */
94extern SDL_DECLSPEC void SDLCALL SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata);
95
96#endif /* defined(SDL_PLATFORM_WINDOWS) */
97
98#if defined(SDL_PLATFORM_WIN32) || defined(SDL_PLATFORM_WINGDK)
99
100/**
101 * Get the D3D9 adapter index that matches the specified display.
102 *
103 * The returned adapter index can be passed to `IDirect3D9::CreateDevice` and
104 * controls on which monitor a full screen application will appear.
105 *
106 * \param displayID the instance of the display to query.
107 * \returns the D3D9 adapter index on success or -1 on failure; call
108 * SDL_GetError() for more information.
109 *
110 * \since This function is available since SDL 3.2.0.
111 */
112extern SDL_DECLSPEC int SDLCALL SDL_GetDirect3D9AdapterIndex(SDL_DisplayID displayID);
113
114/**
115 * Get the DXGI Adapter and Output indices for the specified display.
116 *
117 * The DXGI Adapter and Output indices can be passed to `EnumAdapters` and
118 * `EnumOutputs` respectively to get the objects required to create a DX10 or
119 * DX11 device and swap chain.
120 *
121 * \param displayID the instance of the display to query.
122 * \param adapterIndex a pointer to be filled in with the adapter index.
123 * \param outputIndex a pointer to be filled in with the output index.
124 * \returns true on success or false on failure; call SDL_GetError() for more
125 * information.
126 *
127 * \since This function is available since SDL 3.2.0.
128 */
129extern SDL_DECLSPEC bool SDLCALL SDL_GetDXGIOutputInfo(SDL_DisplayID displayID, int *adapterIndex, int *outputIndex);
130
131#endif /* defined(SDL_PLATFORM_WIN32) || defined(SDL_PLATFORM_WINGDK) */
132
133
134/*
135 * Platform specific functions for UNIX
136 */
137
138/* this is defined in Xlib's headers, just need a simple declaration here. */
139typedef union _XEvent XEvent;
140
141/**
142 * A callback to be used with SDL_SetX11EventHook.
143 *
144 * This callback may modify the event, and should return true if the event
145 * should continue to be processed, or false to prevent further processing.
146 *
147 * As this is processing an event directly from the X11 event loop, this
148 * callback should do the minimum required work and return quickly.
149 *
150 * \param userdata the app-defined pointer provided to SDL_SetX11EventHook.
151 * \param xevent a pointer to an Xlib XEvent union to process.
152 * \returns true to let event continue on, false to drop it.
153 *
154 * \threadsafety This may only be called (by SDL) from the thread handling the
155 * X11 event loop.
156 *
157 * \since This datatype is available since SDL 3.2.0.
158 *
159 * \sa SDL_SetX11EventHook
160 */
161typedef bool (SDLCALL *SDL_X11EventHook)(void *userdata, XEvent *xevent);
162
163/**
164 * Set a callback for every X11 event.
165 *
166 * The callback may modify the event, and should return true if the event
167 * should continue to be processed, or false to prevent further processing.
168 *
169 * \param callback the SDL_X11EventHook function to call.
170 * \param userdata a pointer to pass to every iteration of `callback`.
171 *
172 * \since This function is available since SDL 3.2.0.
173 */
174extern SDL_DECLSPEC void SDLCALL SDL_SetX11EventHook(SDL_X11EventHook callback, void *userdata);
175
176/* Platform specific functions for Linux*/
177#ifdef SDL_PLATFORM_LINUX
178
179/**
180 * Sets the UNIX nice value for a thread.
181 *
182 * This uses setpriority() if possible, and RealtimeKit if available.
183 *
184 * \param threadID the Unix thread ID to change priority of.
185 * \param priority the new, Unix-specific, priority value.
186 * \returns true on success or false on failure; call SDL_GetError() for more
187 * information.
188 *
189 * \since This function is available since SDL 3.2.0.
190 */
191extern SDL_DECLSPEC bool SDLCALL SDL_SetLinuxThreadPriority(Sint64 threadID, int priority);
192
193/**
194 * Sets the priority (not nice level) and scheduling policy for a thread.
195 *
196 * This uses setpriority() if possible, and RealtimeKit if available.
197 *
198 * \param threadID the Unix thread ID to change priority of.
199 * \param sdlPriority the new SDL_ThreadPriority value.
200 * \param schedPolicy the new scheduling policy (SCHED_FIFO, SCHED_RR,
201 * SCHED_OTHER, etc...).
202 * \returns true on success or false on failure; call SDL_GetError() for more
203 * information.
204 *
205 * \since This function is available since SDL 3.2.0.
206 */
207extern SDL_DECLSPEC bool SDLCALL SDL_SetLinuxThreadPriorityAndPolicy(Sint64 threadID, int sdlPriority, int schedPolicy);
208
209#endif /* SDL_PLATFORM_LINUX */
210
211/*
212 * Platform specific functions for iOS
213 */
214#ifdef SDL_PLATFORM_IOS
215
216/**
217 * The prototype for an Apple iOS animation callback.
218 *
219 * This datatype is only useful on Apple iOS.
220 *
221 * After passing a function pointer of this type to
222 * SDL_SetiOSAnimationCallback, the system will call that function pointer at
223 * a regular interval.
224 *
225 * \param userdata what was passed as `callbackParam` to
226 * SDL_SetiOSAnimationCallback as `callbackParam`.
227 *
228 * \since This datatype is available since SDL 3.2.0.
229 *
230 * \sa SDL_SetiOSAnimationCallback
231 */
232typedef void (SDLCALL *SDL_iOSAnimationCallback)(void *userdata);
233
234/**
235 * Use this function to set the animation callback on Apple iOS.
236 *
237 * The function prototype for `callback` is:
238 *
239 * ```c
240 * void callback(void *callbackParam);
241 * ```
242 *
243 * Where its parameter, `callbackParam`, is what was passed as `callbackParam`
244 * to SDL_SetiOSAnimationCallback().
245 *
246 * This function is only available on Apple iOS.
247 *
248 * For more information see:
249 *
250 * https://wiki.libsdl.org/SDL3/README/ios
251 *
252 * Note that if you use the "main callbacks" instead of a standard C `main`
253 * function, you don't have to use this API, as SDL will manage this for you.
254 *
255 * Details on main callbacks are here:
256 *
257 * https://wiki.libsdl.org/SDL3/README/main-functions
258 *
259 * \param window the window for which the animation callback should be set.
260 * \param interval the number of frames after which **callback** will be
261 * called.
262 * \param callback the function to call for every frame.
263 * \param callbackParam a pointer that is passed to `callback`.
264 * \returns true on success or false on failure; call SDL_GetError() for more
265 * information.
266 *
267 * \since This function is available since SDL 3.2.0.
268 *
269 * \sa SDL_SetiOSEventPump
270 */
271extern SDL_DECLSPEC bool SDLCALL SDL_SetiOSAnimationCallback(SDL_Window *window, int interval, SDL_iOSAnimationCallback callback, void *callbackParam);
272
273/**
274 * Use this function to enable or disable the SDL event pump on Apple iOS.
275 *
276 * This function is only available on Apple iOS.
277 *
278 * \param enabled true to enable the event pump, false to disable it.
279 *
280 * \since This function is available since SDL 3.2.0.
281 *
282 * \sa SDL_SetiOSAnimationCallback
283 */
284extern SDL_DECLSPEC void SDLCALL SDL_SetiOSEventPump(bool enabled);
285
286#endif /* SDL_PLATFORM_IOS */
287
288
289/*
290 * Platform specific functions for Android
291 */
292#ifdef SDL_PLATFORM_ANDROID
293
294/**
295 * Get the Android Java Native Interface Environment of the current thread.
296 *
297 * This is the JNIEnv one needs to access the Java virtual machine from native
298 * code, and is needed for many Android APIs to be usable from C.
299 *
300 * The prototype of the function in SDL's code actually declare a void* return
301 * type, even if the implementation returns a pointer to a JNIEnv. The
302 * rationale being that the SDL headers can avoid including jni.h.
303 *
304 * \returns a pointer to Java native interface object (JNIEnv) to which the
305 * current thread is attached, or NULL on failure; call
306 * SDL_GetError() for more information.
307 *
308 * \threadsafety It is safe to call this function from any thread.
309 *
310 * \since This function is available since SDL 3.2.0.
311 *
312 * \sa SDL_GetAndroidActivity
313 */
314extern SDL_DECLSPEC void * SDLCALL SDL_GetAndroidJNIEnv(void);
315
316/**
317 * Retrieve the Java instance of the Android activity class.
318 *
319 * The prototype of the function in SDL's code actually declares a void*
320 * return type, even if the implementation returns a jobject. The rationale
321 * being that the SDL headers can avoid including jni.h.
322 *
323 * The jobject returned by the function is a local reference and must be
324 * released by the caller. See the PushLocalFrame() and PopLocalFrame() or
325 * DeleteLocalRef() functions of the Java native interface:
326 *
327 * https://docs.oracle.com/javase/1.5.0/docs/guide/jni/spec/functions.html
328 *
329 * \returns the jobject representing the instance of the Activity class of the
330 * Android application, or NULL on failure; call SDL_GetError() for
331 * more information.
332 *
333 * \threadsafety It is safe to call this function from any thread.
334 *
335 * \since This function is available since SDL 3.2.0.
336 *
337 * \sa SDL_GetAndroidJNIEnv
338 */
339extern SDL_DECLSPEC void * SDLCALL SDL_GetAndroidActivity(void);
340
341/**
342 * Query Android API level of the current device.
343 *
344 * - API level 35: Android 15 (VANILLA_ICE_CREAM)
345 * - API level 34: Android 14 (UPSIDE_DOWN_CAKE)
346 * - API level 33: Android 13 (TIRAMISU)
347 * - API level 32: Android 12L (S_V2)
348 * - API level 31: Android 12 (S)
349 * - API level 30: Android 11 (R)
350 * - API level 29: Android 10 (Q)
351 * - API level 28: Android 9 (P)
352 * - API level 27: Android 8.1 (O_MR1)
353 * - API level 26: Android 8.0 (O)
354 * - API level 25: Android 7.1 (N_MR1)
355 * - API level 24: Android 7.0 (N)
356 * - API level 23: Android 6.0 (M)
357 * - API level 22: Android 5.1 (LOLLIPOP_MR1)
358 * - API level 21: Android 5.0 (LOLLIPOP, L)
359 * - API level 20: Android 4.4W (KITKAT_WATCH)
360 * - API level 19: Android 4.4 (KITKAT)
361 * - API level 18: Android 4.3 (JELLY_BEAN_MR2)
362 * - API level 17: Android 4.2 (JELLY_BEAN_MR1)
363 * - API level 16: Android 4.1 (JELLY_BEAN)
364 * - API level 15: Android 4.0.3 (ICE_CREAM_SANDWICH_MR1)
365 * - API level 14: Android 4.0 (ICE_CREAM_SANDWICH)
366 * - API level 13: Android 3.2 (HONEYCOMB_MR2)
367 * - API level 12: Android 3.1 (HONEYCOMB_MR1)
368 * - API level 11: Android 3.0 (HONEYCOMB)
369 * - API level 10: Android 2.3.3 (GINGERBREAD_MR1)
370 *
371 * \returns the Android API level.
372 *
373 * \since This function is available since SDL 3.2.0.
374 */
375extern SDL_DECLSPEC int SDLCALL SDL_GetAndroidSDKVersion(void);
376
377/**
378 * Query if the application is running on a Chromebook.
379 *
380 * \returns true if this is a Chromebook, false otherwise.
381 *
382 * \since This function is available since SDL 3.2.0.
383 */
384extern SDL_DECLSPEC bool SDLCALL SDL_IsChromebook(void);
385
386/**
387 * Query if the application is running on a Samsung DeX docking station.
388 *
389 * \returns true if this is a DeX docking station, false otherwise.
390 *
391 * \since This function is available since SDL 3.2.0.
392 */
393extern SDL_DECLSPEC bool SDLCALL SDL_IsDeXMode(void);
394
395/**
396 * Trigger the Android system back button behavior.
397 *
398 * \threadsafety It is safe to call this function from any thread.
399 *
400 * \since This function is available since SDL 3.2.0.
401 */
402extern SDL_DECLSPEC void SDLCALL SDL_SendAndroidBackButton(void);
403
404/**
405 * See the official Android developer guide for more information:
406 * http://developer.android.com/guide/topics/data/data-storage.html
407 *
408 * \since This macro is available since SDL 3.2.0.
409 */
410#define SDL_ANDROID_EXTERNAL_STORAGE_READ 0x01
411
412/**
413 * See the official Android developer guide for more information:
414 * http://developer.android.com/guide/topics/data/data-storage.html
415 *
416 * \since This macro is available since SDL 3.2.0.
417 */
418#define SDL_ANDROID_EXTERNAL_STORAGE_WRITE 0x02
419
420/**
421 * Get the path used for internal storage for this Android application.
422 *
423 * This path is unique to your application and cannot be written to by other
424 * applications.
425 *
426 * Your internal storage path is typically:
427 * `/data/data/your.app.package/files`.
428 *
429 * This is a C wrapper over `android.content.Context.getFilesDir()`:
430 *
431 * https://developer.android.com/reference/android/content/Context#getFilesDir()
432 *
433 * \returns the path used for internal storage or NULL on failure; call
434 * SDL_GetError() for more information.
435 *
436 * \since This function is available since SDL 3.2.0.
437 *
438 * \sa SDL_GetAndroidExternalStoragePath
439 * \sa SDL_GetAndroidCachePath
440 */
441extern SDL_DECLSPEC const char * SDLCALL SDL_GetAndroidInternalStoragePath(void);
442
443/**
444 * Get the current state of external storage for this Android application.
445 *
446 * The current state of external storage, a bitmask of these values:
447 * `SDL_ANDROID_EXTERNAL_STORAGE_READ`, `SDL_ANDROID_EXTERNAL_STORAGE_WRITE`.
448 *
449 * If external storage is currently unavailable, this will return 0.
450 *
451 * \returns the current state of external storage, or 0 if external storage is
452 * currently unavailable.
453 *
454 * \since This function is available since SDL 3.2.0.
455 *
456 * \sa SDL_GetAndroidExternalStoragePath
457 */
458extern SDL_DECLSPEC Uint32 SDLCALL SDL_GetAndroidExternalStorageState(void);
459
460/**
461 * Get the path used for external storage for this Android application.
462 *
463 * This path is unique to your application, but is public and can be written
464 * to by other applications.
465 *
466 * Your external storage path is typically:
467 * `/storage/sdcard0/Android/data/your.app.package/files`.
468 *
469 * This is a C wrapper over `android.content.Context.getExternalFilesDir()`:
470 *
471 * https://developer.android.com/reference/android/content/Context#getExternalFilesDir()
472 *
473 * \returns the path used for external storage for this application on success
474 * or NULL on failure; call SDL_GetError() for more information.
475 *
476 * \since This function is available since SDL 3.2.0.
477 *
478 * \sa SDL_GetAndroidExternalStorageState
479 * \sa SDL_GetAndroidInternalStoragePath
480 * \sa SDL_GetAndroidCachePath
481 */
482extern SDL_DECLSPEC const char * SDLCALL SDL_GetAndroidExternalStoragePath(void);
483
484/**
485 * Get the path used for caching data for this Android application.
486 *
487 * This path is unique to your application, but is public and can be written
488 * to by other applications.
489 *
490 * Your cache path is typically: `/data/data/your.app.package/cache/`.
491 *
492 * This is a C wrapper over `android.content.Context.getCacheDir()`:
493 *
494 * https://developer.android.com/reference/android/content/Context#getCacheDir()
495 *
496 * \returns the path used for caches for this application on success or NULL
497 * on failure; call SDL_GetError() for more information.
498 *
499 * \since This function is available since SDL 3.2.0.
500 *
501 * \sa SDL_GetAndroidInternalStoragePath
502 * \sa SDL_GetAndroidExternalStoragePath
503 */
504extern SDL_DECLSPEC const char * SDLCALL SDL_GetAndroidCachePath(void);
505
506/**
507 * Callback that presents a response from a SDL_RequestAndroidPermission call.
508 *
509 * \param userdata an app-controlled pointer that is passed to the callback.
510 * \param permission the Android-specific permission name that was requested.
511 * \param granted true if permission is granted, false if denied.
512 *
513 * \since This datatype is available since SDL 3.2.0.
514 *
515 * \sa SDL_RequestAndroidPermission
516 */
517typedef void (SDLCALL *SDL_RequestAndroidPermissionCallback)(void *userdata, const char *permission, bool granted);
518
519/**
520 * Request permissions at runtime, asynchronously.
521 *
522 * You do not need to call this for built-in functionality of SDL; recording
523 * from a microphone or reading images from a camera, using standard SDL APIs,
524 * will manage permission requests for you.
525 *
526 * This function never blocks. Instead, the app-supplied callback will be
527 * called when a decision has been made. This callback may happen on a
528 * different thread, and possibly much later, as it might wait on a user to
529 * respond to a system dialog. If permission has already been granted for a
530 * specific entitlement, the callback will still fire, probably on the current
531 * thread and before this function returns.
532 *
533 * If the request submission fails, this function returns -1 and the callback
534 * will NOT be called, but this should only happen in catastrophic conditions,
535 * like memory running out. Normally there will be a yes or no to the request
536 * through the callback.
537 *
538 * For the `permission` parameter, choose a value from here:
539 *
540 * https://developer.android.com/reference/android/Manifest.permission
541 *
542 * \param permission the permission to request.
543 * \param cb the callback to trigger when the request has a response.
544 * \param userdata an app-controlled pointer that is passed to the callback.
545 * \returns true if the request was submitted, false if there was an error
546 * submitting. The result of the request is only ever reported
547 * through the callback, not this return value.
548 *
549 * \threadsafety It is safe to call this function from any thread.
550 *
551 * \since This function is available since SDL 3.2.0.
552 */
553extern SDL_DECLSPEC bool SDLCALL SDL_RequestAndroidPermission(const char *permission, SDL_RequestAndroidPermissionCallback cb, void *userdata);
554
555/**
556 * Shows an Android toast notification.
557 *
558 * Toasts are a sort of lightweight notification that are unique to Android.
559 *
560 * https://developer.android.com/guide/topics/ui/notifiers/toasts
561 *
562 * Shows toast in UI thread.
563 *
564 * For the `gravity` parameter, choose a value from here, or -1 if you don't
565 * have a preference:
566 *
567 * https://developer.android.com/reference/android/view/Gravity
568 *
569 * \param message text message to be shown.
570 * \param duration 0=short, 1=long.
571 * \param gravity where the notification should appear on the screen.
572 * \param xoffset set this parameter only when gravity >=0.
573 * \param yoffset set this parameter only when gravity >=0.
574 * \returns true on success or false on failure; call SDL_GetError() for more
575 * information.
576 *
577 * \threadsafety It is safe to call this function from any thread.
578 *
579 * \since This function is available since SDL 3.2.0.
580 */
581extern SDL_DECLSPEC bool SDLCALL SDL_ShowAndroidToast(const char *message, int duration, int gravity, int xoffset, int yoffset);
582
583/**
584 * Send a user command to SDLActivity.
585 *
586 * Override "boolean onUnhandledMessage(Message msg)" to handle the message.
587 *
588 * \param command user command that must be greater or equal to 0x8000.
589 * \param param user parameter.
590 * \returns true on success or false on failure; call SDL_GetError() for more
591 * information.
592 *
593 * \threadsafety It is safe to call this function from any thread.
594 *
595 * \since This function is available since SDL 3.2.0.
596 */
597extern SDL_DECLSPEC bool SDLCALL SDL_SendAndroidMessage(Uint32 command, int param);
598
599#endif /* SDL_PLATFORM_ANDROID */
600
601/**
602 * Query if the current device is a tablet.
603 *
604 * If SDL can't determine this, it will return false.
605 *
606 * \returns true if the device is a tablet, false otherwise.
607 *
608 * \since This function is available since SDL 3.2.0.
609 */
610extern SDL_DECLSPEC bool SDLCALL SDL_IsTablet(void);
611
612/**
613 * Query if the current device is a TV.
614 *
615 * If SDL can't determine this, it will return false.
616 *
617 * \returns true if the device is a TV, false otherwise.
618 *
619 * \since This function is available since SDL 3.2.0.
620 */
621extern SDL_DECLSPEC bool SDLCALL SDL_IsTV(void);
622
623/**
624 * Application sandbox environment.
625 *
626 * \since This enum is available since SDL 3.2.0.
627 */
628typedef enum SDL_Sandbox
629{
630 SDL_SANDBOX_NONE = 0,
631 SDL_SANDBOX_UNKNOWN_CONTAINER,
632 SDL_SANDBOX_FLATPAK,
633 SDL_SANDBOX_SNAP,
634 SDL_SANDBOX_MACOS
635} SDL_Sandbox;
636
637/**
638 * Get the application sandbox environment, if any.
639 *
640 * \returns the application sandbox environment or SDL_SANDBOX_NONE if the
641 * application is not running in a sandbox environment.
642 *
643 * \since This function is available since SDL 3.2.0.
644 */
645extern SDL_DECLSPEC SDL_Sandbox SDLCALL SDL_GetSandbox(void);
646
647
648/* Functions used by iOS app delegates to notify SDL about state changes. */
649
650/**
651 * Let iOS apps with external event handling report
652 * onApplicationWillTerminate.
653 *
654 * This functions allows iOS apps that have their own event handling to hook
655 * into SDL to generate SDL events. This maps directly to an iOS-specific
656 * event, but since it doesn't do anything iOS-specific internally, it is
657 * available on all platforms, in case it might be useful for some specific
658 * paradigm. Most apps do not need to use this directly; SDL's internal event
659 * code will handle all this for windows created by SDL_CreateWindow!
660 *
661 * \threadsafety It is safe to call this function from any thread.
662 *
663 * \since This function is available since SDL 3.2.0.
664 */
665extern SDL_DECLSPEC void SDLCALL SDL_OnApplicationWillTerminate(void);
666
667/**
668 * Let iOS apps with external event handling report
669 * onApplicationDidReceiveMemoryWarning.
670 *
671 * This functions allows iOS apps that have their own event handling to hook
672 * into SDL to generate SDL events. This maps directly to an iOS-specific
673 * event, but since it doesn't do anything iOS-specific internally, it is
674 * available on all platforms, in case it might be useful for some specific
675 * paradigm. Most apps do not need to use this directly; SDL's internal event
676 * code will handle all this for windows created by SDL_CreateWindow!
677 *
678 * \threadsafety It is safe to call this function from any thread.
679 *
680 * \since This function is available since SDL 3.2.0.
681 */
682extern SDL_DECLSPEC void SDLCALL SDL_OnApplicationDidReceiveMemoryWarning(void);
683
684/**
685 * Let iOS apps with external event handling report
686 * onApplicationWillResignActive.
687 *
688 * This functions allows iOS apps that have their own event handling to hook
689 * into SDL to generate SDL events. This maps directly to an iOS-specific
690 * event, but since it doesn't do anything iOS-specific internally, it is
691 * available on all platforms, in case it might be useful for some specific
692 * paradigm. Most apps do not need to use this directly; SDL's internal event
693 * code will handle all this for windows created by SDL_CreateWindow!
694 *
695 * \threadsafety It is safe to call this function from any thread.
696 *
697 * \since This function is available since SDL 3.2.0.
698 */
699extern SDL_DECLSPEC void SDLCALL SDL_OnApplicationWillEnterBackground(void);
700
701/**
702 * Let iOS apps with external event handling report
703 * onApplicationDidEnterBackground.
704 *
705 * This functions allows iOS apps that have their own event handling to hook
706 * into SDL to generate SDL events. This maps directly to an iOS-specific
707 * event, but since it doesn't do anything iOS-specific internally, it is
708 * available on all platforms, in case it might be useful for some specific
709 * paradigm. Most apps do not need to use this directly; SDL's internal event
710 * code will handle all this for windows created by SDL_CreateWindow!
711 *
712 * \threadsafety It is safe to call this function from any thread.
713 *
714 * \since This function is available since SDL 3.2.0.
715 */
716extern SDL_DECLSPEC void SDLCALL SDL_OnApplicationDidEnterBackground(void);
717
718/**
719 * Let iOS apps with external event handling report
720 * onApplicationWillEnterForeground.
721 *
722 * This functions allows iOS apps that have their own event handling to hook
723 * into SDL to generate SDL events. This maps directly to an iOS-specific
724 * event, but since it doesn't do anything iOS-specific internally, it is
725 * available on all platforms, in case it might be useful for some specific
726 * paradigm. Most apps do not need to use this directly; SDL's internal event
727 * code will handle all this for windows created by SDL_CreateWindow!
728 *
729 * \threadsafety It is safe to call this function from any thread.
730 *
731 * \since This function is available since SDL 3.2.0.
732 */
733extern SDL_DECLSPEC void SDLCALL SDL_OnApplicationWillEnterForeground(void);
734
735/**
736 * Let iOS apps with external event handling report
737 * onApplicationDidBecomeActive.
738 *
739 * This functions allows iOS apps that have their own event handling to hook
740 * into SDL to generate SDL events. This maps directly to an iOS-specific
741 * event, but since it doesn't do anything iOS-specific internally, it is
742 * available on all platforms, in case it might be useful for some specific
743 * paradigm. Most apps do not need to use this directly; SDL's internal event
744 * code will handle all this for windows created by SDL_CreateWindow!
745 *
746 * \threadsafety It is safe to call this function from any thread.
747 *
748 * \since This function is available since SDL 3.2.0.
749 */
750extern SDL_DECLSPEC void SDLCALL SDL_OnApplicationDidEnterForeground(void);
751
752#ifdef SDL_PLATFORM_IOS
753
754/**
755 * Let iOS apps with external event handling report
756 * onApplicationDidChangeStatusBarOrientation.
757 *
758 * This functions allows iOS apps that have their own event handling to hook
759 * into SDL to generate SDL events. This maps directly to an iOS-specific
760 * event, but since it doesn't do anything iOS-specific internally, it is
761 * available on all platforms, in case it might be useful for some specific
762 * paradigm. Most apps do not need to use this directly; SDL's internal event
763 * code will handle all this for windows created by SDL_CreateWindow!
764 *
765 * \threadsafety It is safe to call this function from any thread.
766 *
767 * \since This function is available since SDL 3.2.0.
768 */
769extern SDL_DECLSPEC void SDLCALL SDL_OnApplicationDidChangeStatusBarOrientation(void);
770#endif
771
772/*
773 * Functions used only by GDK
774 */
775#ifdef SDL_PLATFORM_GDK
776typedef struct XTaskQueueObject *XTaskQueueHandle;
777typedef struct XUser *XUserHandle;
778
779/**
780 * Gets a reference to the global async task queue handle for GDK,
781 * initializing if needed.
782 *
783 * Once you are done with the task queue, you should call
784 * XTaskQueueCloseHandle to reduce the reference count to avoid a resource
785 * leak.
786 *
787 * \param outTaskQueue a pointer to be filled in with task queue handle.
788 * \returns true on success or false on failure; call SDL_GetError() for more
789 * information.
790 *
791 * \since This function is available since SDL 3.2.0.
792 */
793extern SDL_DECLSPEC bool SDLCALL SDL_GetGDKTaskQueue(XTaskQueueHandle *outTaskQueue);
794
795/**
796 * Gets a reference to the default user handle for GDK.
797 *
798 * This is effectively a synchronous version of XUserAddAsync, which always
799 * prefers the default user and allows a sign-in UI.
800 *
801 * \param outUserHandle a pointer to be filled in with the default user
802 * handle.
803 * \returns true if success or false on failure; call SDL_GetError() for more
804 * information.
805 *
806 * \since This function is available since SDL 3.2.0.
807 */
808extern SDL_DECLSPEC bool SDLCALL SDL_GetGDKDefaultUser(XUserHandle *outUserHandle);
809
810#endif
811
812/* Ends C function definitions when using C++ */
813#ifdef __cplusplus
814}
815#endif
816#include <SDL3/SDL_close_code.h>
817
818#endif /* SDL_system_h_ */
819