SDL  2.0
SDL_hints.h
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2022 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  * \file SDL_hints.h
24  *
25  * Official documentation for SDL configuration variables
26  *
27  * This file contains functions to set and get configuration hints,
28  * as well as listing each of them alphabetically.
29  *
30  * The convention for naming hints is SDL_HINT_X, where "SDL_X" is
31  * the environment variable that can be used to override the default.
32  *
33  * In general these hints are just that - they may or may not be
34  * supported or applicable on any given platform, but they provide
35  * a way for an application or user to give the library a hint as
36  * to how they would like the library to work.
37  */
38 
39 #ifndef SDL_hints_h_
40 #define SDL_hints_h_
41 
42 #include "SDL_stdinc.h"
43 
44 #include "begin_code.h"
45 /* Set up for C function definitions, even when using C++ */
46 #ifdef __cplusplus
47 extern "C" {
48 #endif
49 
50 /**
51  * \brief A variable controlling whether the Android / iOS built-in
52  * accelerometer should be listed as a joystick device.
53  *
54  * This variable can be set to the following values:
55  * "0" - The accelerometer is not listed as a joystick
56  * "1" - The accelerometer is available as a 3 axis joystick (the default).
57  */
58 #define SDL_HINT_ACCELEROMETER_AS_JOYSTICK "SDL_ACCELEROMETER_AS_JOYSTICK"
59 
60 /**
61  * \brief Specify the behavior of Alt+Tab while the keyboard is grabbed.
62  *
63  * By default, SDL emulates Alt+Tab functionality while the keyboard is grabbed
64  * and your window is full-screen. This prevents the user from getting stuck in
65  * your application if you've enabled keyboard grab.
66  *
67  * The variable can be set to the following values:
68  * "0" - SDL will not handle Alt+Tab. Your application is responsible
69  for handling Alt+Tab while the keyboard is grabbed.
70  * "1" - SDL will minimize your window when Alt+Tab is pressed (default)
71 */
72 #define SDL_HINT_ALLOW_ALT_TAB_WHILE_GRABBED "SDL_ALLOW_ALT_TAB_WHILE_GRABBED"
73 
74 /**
75  * \brief If set to "0" then never set the top most bit on a SDL Window, even if the video mode expects it.
76  * This is a debugging aid for developers and not expected to be used by end users. The default is "1"
77  *
78  * This variable can be set to the following values:
79  * "0" - don't allow topmost
80  * "1" - allow topmost
81  */
82 #define SDL_HINT_ALLOW_TOPMOST "SDL_ALLOW_TOPMOST"
83 
84 /**
85  * \brief Android APK expansion main file version. Should be a string number like "1", "2" etc.
86  *
87  * Must be set together with SDL_HINT_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION.
88  *
89  * If both hints were set then SDL_RWFromFile() will look into expansion files
90  * after a given relative path was not found in the internal storage and assets.
91  *
92  * By default this hint is not set and the APK expansion files are not searched.
93  */
94 #define SDL_HINT_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION "SDL_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION"
95 
96 /**
97  * \brief Android APK expansion patch file version. Should be a string number like "1", "2" etc.
98  *
99  * Must be set together with SDL_HINT_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION.
100  *
101  * If both hints were set then SDL_RWFromFile() will look into expansion files
102  * after a given relative path was not found in the internal storage and assets.
103  *
104  * By default this hint is not set and the APK expansion files are not searched.
105  */
106 #define SDL_HINT_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION "SDL_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION"
107 
108 /**
109  * \brief A variable to control whether the event loop will block itself when the app is paused.
110  *
111  * The variable can be set to the following values:
112  * "0" - Non blocking.
113  * "1" - Blocking. (default)
114  *
115  * The value should be set before SDL is initialized.
116  */
117 #define SDL_HINT_ANDROID_BLOCK_ON_PAUSE "SDL_ANDROID_BLOCK_ON_PAUSE"
118 
119 /**
120  * \brief A variable to control whether SDL will pause audio in background
121  * (Requires SDL_ANDROID_BLOCK_ON_PAUSE as "Non blocking")
122  *
123  * The variable can be set to the following values:
124  * "0" - Non paused.
125  * "1" - Paused. (default)
126  *
127  * The value should be set before SDL is initialized.
128  */
129 #define SDL_HINT_ANDROID_BLOCK_ON_PAUSE_PAUSEAUDIO "SDL_ANDROID_BLOCK_ON_PAUSE_PAUSEAUDIO"
130 
131 /**
132  * \brief A variable to control whether we trap the Android back button to handle it manually.
133  * This is necessary for the right mouse button to work on some Android devices, or
134  * to be able to trap the back button for use in your code reliably. If set to true,
135  * the back button will show up as an SDL_KEYDOWN / SDL_KEYUP pair with a keycode of
136  * SDL_SCANCODE_AC_BACK.
137  *
138  * The variable can be set to the following values:
139  * "0" - Back button will be handled as usual for system. (default)
140  * "1" - Back button will be trapped, allowing you to handle the key press
141  * manually. (This will also let right mouse click work on systems
142  * where the right mouse button functions as back.)
143  *
144  * The value of this hint is used at runtime, so it can be changed at any time.
145  */
146 #define SDL_HINT_ANDROID_TRAP_BACK_BUTTON "SDL_ANDROID_TRAP_BACK_BUTTON"
147 
148 /**
149  * \brief Specify an application name.
150  *
151  * This hint lets you specify the application name sent to the OS when
152  * required. For example, this will often appear in volume control applets for
153  * audio streams, and in lists of applications which are inhibiting the
154  * screensaver. You should use a string that describes your program ("My Game
155  * 2: The Revenge")
156  *
157  * Setting this to "" or leaving it unset will have SDL use a reasonable
158  * default: probably the application's name or "SDL Application" if SDL
159  * doesn't have any better information.
160  *
161  * Note that, for audio streams, this can be overridden with
162  * SDL_HINT_AUDIO_DEVICE_APP_NAME.
163  *
164  * On targets where this is not supported, this hint does nothing.
165  */
166 #define SDL_HINT_APP_NAME "SDL_APP_NAME"
167 
168 /**
169  * \brief A variable controlling whether controllers used with the Apple TV
170  * generate UI events.
171  *
172  * When UI events are generated by controller input, the app will be
173  * backgrounded when the Apple TV remote's menu button is pressed, and when the
174  * pause or B buttons on gamepads are pressed.
175  *
176  * More information about properly making use of controllers for the Apple TV
177  * can be found here:
178  * https://developer.apple.com/tvos/human-interface-guidelines/remote-and-controllers/
179  *
180  * This variable can be set to the following values:
181  * "0" - Controller input does not generate UI events (the default).
182  * "1" - Controller input generates UI events.
183  */
184 #define SDL_HINT_APPLE_TV_CONTROLLER_UI_EVENTS "SDL_APPLE_TV_CONTROLLER_UI_EVENTS"
185 
186 /**
187  * \brief A variable controlling whether the Apple TV remote's joystick axes
188  * will automatically match the rotation of the remote.
189  *
190  * This variable can be set to the following values:
191  * "0" - Remote orientation does not affect joystick axes (the default).
192  * "1" - Joystick axes are based on the orientation of the remote.
193  */
194 #define SDL_HINT_APPLE_TV_REMOTE_ALLOW_ROTATION "SDL_APPLE_TV_REMOTE_ALLOW_ROTATION"
195 
196 /**
197  * \brief A variable controlling the audio category on iOS and Mac OS X
198  *
199  * This variable can be set to the following values:
200  *
201  * "ambient" - Use the AVAudioSessionCategoryAmbient audio category, will be muted by the phone mute switch (default)
202  * "playback" - Use the AVAudioSessionCategoryPlayback category
203  *
204  * For more information, see Apple's documentation:
205  * https://developer.apple.com/library/content/documentation/Audio/Conceptual/AudioSessionProgrammingGuide/AudioSessionCategoriesandModes/AudioSessionCategoriesandModes.html
206  */
207 #define SDL_HINT_AUDIO_CATEGORY "SDL_AUDIO_CATEGORY"
208 
209 /**
210  * \brief Specify an application name for an audio device.
211  *
212  * Some audio backends (such as PulseAudio) allow you to describe your audio
213  * stream. Among other things, this description might show up in a system
214  * control panel that lets the user adjust the volume on specific audio
215  * streams instead of using one giant master volume slider.
216  *
217  * This hints lets you transmit that information to the OS. The contents of
218  * this hint are used while opening an audio device. You should use a string
219  * that describes your program ("My Game 2: The Revenge")
220  *
221  * Setting this to "" or leaving it unset will have SDL use a reasonable
222  * default: this will be the name set with SDL_HINT_APP_NAME, if that hint is
223  * set. Otherwise, it'll probably the application's name or "SDL Application"
224  * if SDL doesn't have any better information.
225  *
226  * On targets where this is not supported, this hint does nothing.
227  */
228 #define SDL_HINT_AUDIO_DEVICE_APP_NAME "SDL_AUDIO_DEVICE_APP_NAME"
229 
230 /**
231  * \brief Specify an application name for an audio device.
232  *
233  * Some audio backends (such as PulseAudio) allow you to describe your audio
234  * stream. Among other things, this description might show up in a system
235  * control panel that lets the user adjust the volume on specific audio
236  * streams instead of using one giant master volume slider.
237  *
238  * This hints lets you transmit that information to the OS. The contents of
239  * this hint are used while opening an audio device. You should use a string
240  * that describes your what your program is playing ("audio stream" is
241  * probably sufficient in many cases, but this could be useful for something
242  * like "team chat" if you have a headset playing VoIP audio separately).
243  *
244  * Setting this to "" or leaving it unset will have SDL use a reasonable
245  * default: "audio stream" or something similar.
246  *
247  * On targets where this is not supported, this hint does nothing.
248  */
249 #define SDL_HINT_AUDIO_DEVICE_STREAM_NAME "SDL_AUDIO_DEVICE_STREAM_NAME"
250 
251 /**
252  * \brief Specify an application role for an audio device.
253  *
254  * Some audio backends (such as Pipewire) allow you to describe the role of
255  * your audio stream. Among other things, this description might show up in
256  * a system control panel or software for displaying and manipulating media
257  * playback/capture graphs.
258  *
259  * This hints lets you transmit that information to the OS. The contents of
260  * this hint are used while opening an audio device. You should use a string
261  * that describes your what your program is playing (Game, Music, Movie,
262  * etc...).
263  *
264  * Setting this to "" or leaving it unset will have SDL use a reasonable
265  * default: "Game" or something similar.
266  *
267  * On targets where this is not supported, this hint does nothing.
268  */
269 #define SDL_HINT_AUDIO_DEVICE_STREAM_ROLE "SDL_AUDIO_DEVICE_STREAM_ROLE"
270 
271 /**
272  * \brief A variable controlling speed/quality tradeoff of audio resampling.
273  *
274  * If available, SDL can use libsamplerate ( http://www.mega-nerd.com/SRC/ )
275  * to handle audio resampling. There are different resampling modes available
276  * that produce different levels of quality, using more CPU.
277  *
278  * If this hint isn't specified to a valid setting, or libsamplerate isn't
279  * available, SDL will use the default, internal resampling algorithm.
280  *
281  * Note that this is currently only applicable to resampling audio that is
282  * being written to a device for playback or audio being read from a device
283  * for capture. SDL_AudioCVT always uses the default resampler (although this
284  * might change for SDL 2.1).
285  *
286  * This hint is currently only checked at audio subsystem initialization.
287  *
288  * This variable can be set to the following values:
289  *
290  * "0" or "default" - Use SDL's internal resampling (Default when not set - low quality, fast)
291  * "1" or "fast" - Use fast, slightly higher quality resampling, if available
292  * "2" or "medium" - Use medium quality resampling, if available
293  * "3" or "best" - Use high quality resampling, if available
294  */
295 #define SDL_HINT_AUDIO_RESAMPLING_MODE "SDL_AUDIO_RESAMPLING_MODE"
296 
297 /**
298  * \brief A variable controlling whether SDL updates joystick state when getting input events
299  *
300  * This variable can be set to the following values:
301  *
302  * "0" - You'll call SDL_JoystickUpdate() manually
303  * "1" - SDL will automatically call SDL_JoystickUpdate() (default)
304  *
305  * This hint can be toggled on and off at runtime.
306  */
307 #define SDL_HINT_AUTO_UPDATE_JOYSTICKS "SDL_AUTO_UPDATE_JOYSTICKS"
308 
309 /**
310  * \brief A variable controlling whether SDL updates sensor state when getting input events
311  *
312  * This variable can be set to the following values:
313  *
314  * "0" - You'll call SDL_SensorUpdate() manually
315  * "1" - SDL will automatically call SDL_SensorUpdate() (default)
316  *
317  * This hint can be toggled on and off at runtime.
318  */
319 #define SDL_HINT_AUTO_UPDATE_SENSORS "SDL_AUTO_UPDATE_SENSORS"
320 
321 /**
322  * \brief Prevent SDL from using version 4 of the bitmap header when saving BMPs.
323  *
324  * The bitmap header version 4 is required for proper alpha channel support and
325  * SDL will use it when required. Should this not be desired, this hint can
326  * force the use of the 40 byte header version which is supported everywhere.
327  *
328  * The variable can be set to the following values:
329  * "0" - Surfaces with a colorkey or an alpha channel are saved to a
330  * 32-bit BMP file with an alpha mask. SDL will use the bitmap
331  * header version 4 and set the alpha mask accordingly.
332  * "1" - Surfaces with a colorkey or an alpha channel are saved to a
333  * 32-bit BMP file without an alpha mask. The alpha channel data
334  * will be in the file, but applications are going to ignore it.
335  *
336  * The default value is "0".
337  */
338 #define SDL_HINT_BMP_SAVE_LEGACY_FORMAT "SDL_BMP_SAVE_LEGACY_FORMAT"
339 
340 /**
341  * \brief Override for SDL_GetDisplayUsableBounds()
342  *
343  * If set, this hint will override the expected results for
344  * SDL_GetDisplayUsableBounds() for display index 0. Generally you don't want
345  * to do this, but this allows an embedded system to request that some of the
346  * screen be reserved for other uses when paired with a well-behaved
347  * application.
348  *
349  * The contents of this hint must be 4 comma-separated integers, the first
350  * is the bounds x, then y, width and height, in that order.
351  */
352 #define SDL_HINT_DISPLAY_USABLE_BOUNDS "SDL_DISPLAY_USABLE_BOUNDS"
353 
354 /**
355  * \brief Disable giving back control to the browser automatically
356  * when running with asyncify
357  *
358  * With -s ASYNCIFY, SDL2 calls emscripten_sleep during operations
359  * such as refreshing the screen or polling events.
360  *
361  * This hint only applies to the emscripten platform
362  *
363  * The variable can be set to the following values:
364  * "0" - Disable emscripten_sleep calls (if you give back browser control manually or use asyncify for other purposes)
365  * "1" - Enable emscripten_sleep calls (the default)
366  */
367 #define SDL_HINT_EMSCRIPTEN_ASYNCIFY "SDL_EMSCRIPTEN_ASYNCIFY"
368 
369 /**
370  * \brief override the binding element for keyboard inputs for Emscripten builds
371  *
372  * This hint only applies to the emscripten platform
373  *
374  * The variable can be one of
375  * "#window" - The javascript window object (this is the default)
376  * "#document" - The javascript document object
377  * "#screen" - the javascript window.screen object
378  * "#canvas" - the WebGL canvas element
379  * any other string without a leading # sign applies to the element on the page with that ID.
380  */
381 #define SDL_HINT_EMSCRIPTEN_KEYBOARD_ELEMENT "SDL_EMSCRIPTEN_KEYBOARD_ELEMENT"
382 
383 /**
384  * \brief A variable that controls whether Steam Controllers should be exposed using the SDL joystick and game controller APIs
385  *
386  * The variable can be set to the following values:
387  * "0" - Do not scan for Steam Controllers
388  * "1" - Scan for Steam Controllers (the default)
389  *
390  * The default value is "1". This hint must be set before initializing the joystick subsystem.
391  */
392 #define SDL_HINT_ENABLE_STEAM_CONTROLLERS "SDL_ENABLE_STEAM_CONTROLLERS"
393 
394 /**
395  * \brief A variable controlling verbosity of the logging of SDL events pushed onto the internal queue.
396  *
397  * This variable can be set to the following values, from least to most verbose:
398  *
399  * "0" - Don't log any events (default)
400  * "1" - Log most events (other than the really spammy ones).
401  * "2" - Include mouse and finger motion events.
402  * "3" - Include SDL_SysWMEvent events.
403  *
404  * This is generally meant to be used to debug SDL itself, but can be useful
405  * for application developers that need better visibility into what is going
406  * on in the event queue. Logged events are sent through SDL_Log(), which
407  * means by default they appear on stdout on most platforms or maybe
408  * OutputDebugString() on Windows, and can be funneled by the app with
409  * SDL_LogSetOutputFunction(), etc.
410  *
411  * This hint can be toggled on and off at runtime, if you only need to log
412  * events for a small subset of program execution.
413  */
414 #define SDL_HINT_EVENT_LOGGING "SDL_EVENT_LOGGING"
415 
416 /**
417  * \brief A variable controlling whether raising the window should be done more forcefully
418  *
419  * This variable can be set to the following values:
420  * "0" - No forcing (the default)
421  * "1" - Extra level of forcing
422  *
423  * At present, this is only an issue under MS Windows, which makes it nearly impossible to
424  * programmatically move a window to the foreground, for "security" reasons. See
425  * http://stackoverflow.com/a/34414846 for a discussion.
426  */
427 #define SDL_HINT_FORCE_RAISEWINDOW "SDL_HINT_FORCE_RAISEWINDOW"
428 
429 /**
430  * \brief A variable controlling how 3D acceleration is used to accelerate the SDL screen surface.
431  *
432  * SDL can try to accelerate the SDL screen surface by using streaming
433  * textures with a 3D rendering engine. This variable controls whether and
434  * how this is done.
435  *
436  * This variable can be set to the following values:
437  * "0" - Disable 3D acceleration
438  * "1" - Enable 3D acceleration, using the default renderer.
439  * "X" - Enable 3D acceleration, using X where X is one of the valid rendering drivers. (e.g. "direct3d", "opengl", etc.)
440  *
441  * By default SDL tries to make a best guess for each platform whether
442  * to use acceleration or not.
443  */
444 #define SDL_HINT_FRAMEBUFFER_ACCELERATION "SDL_FRAMEBUFFER_ACCELERATION"
445 
446 /**
447  * \brief A variable that lets you manually hint extra gamecontroller db entries.
448  *
449  * The variable should be newline delimited rows of gamecontroller config data, see SDL_gamecontroller.h
450  *
451  * This hint must be set before calling SDL_Init(SDL_INIT_GAMECONTROLLER)
452  * You can update mappings after the system is initialized with SDL_GameControllerMappingForGUID() and SDL_GameControllerAddMapping()
453  */
454 #define SDL_HINT_GAMECONTROLLERCONFIG "SDL_GAMECONTROLLERCONFIG"
455 
456 /**
457  * \brief A variable that lets you provide a file with extra gamecontroller db entries.
458  *
459  * The file should contain lines of gamecontroller config data, see SDL_gamecontroller.h
460  *
461  * This hint must be set before calling SDL_Init(SDL_INIT_GAMECONTROLLER)
462  * You can update mappings after the system is initialized with SDL_GameControllerMappingForGUID() and SDL_GameControllerAddMapping()
463  */
464 #define SDL_HINT_GAMECONTROLLERCONFIG_FILE "SDL_GAMECONTROLLERCONFIG_FILE"
465 
466 /**
467  * \brief A variable that overrides the automatic controller type detection
468  *
469  * The variable should be comma separated entries, in the form: VID/PID=type
470  *
471  * The VID and PID should be hexadecimal with exactly 4 digits, e.g. 0x00fd
472  *
473  * The type should be one of:
474  * Xbox360
475  * XboxOne
476  * PS3
477  * PS4
478  * PS5
479  * SwitchPro
480  *
481  * This hint affects what driver is used, and must be set before calling SDL_Init(SDL_INIT_GAMECONTROLLER)
482  */
483 #define SDL_HINT_GAMECONTROLLERTYPE "SDL_GAMECONTROLLERTYPE"
484 
485 /**
486  * \brief A variable containing a list of devices to skip when scanning for game controllers.
487  *
488  * The format of the string is a comma separated list of USB VID/PID pairs
489  * in hexadecimal form, e.g.
490  *
491  * 0xAAAA/0xBBBB,0xCCCC/0xDDDD
492  *
493  * The variable can also take the form of @file, in which case the named
494  * file will be loaded and interpreted as the value of the variable.
495  */
496 #define SDL_HINT_GAMECONTROLLER_IGNORE_DEVICES "SDL_GAMECONTROLLER_IGNORE_DEVICES"
497 
498 /**
499  * \brief If set, all devices will be skipped when scanning for game controllers except for the ones listed in this variable.
500  *
501  * The format of the string is a comma separated list of USB VID/PID pairs
502  * in hexadecimal form, e.g.
503  *
504  * 0xAAAA/0xBBBB,0xCCCC/0xDDDD
505  *
506  * The variable can also take the form of @file, in which case the named
507  * file will be loaded and interpreted as the value of the variable.
508  */
509 #define SDL_HINT_GAMECONTROLLER_IGNORE_DEVICES_EXCEPT "SDL_GAMECONTROLLER_IGNORE_DEVICES_EXCEPT"
510 
511 /**
512  * \brief If set, game controller face buttons report their values according to their labels instead of their positional layout.
513  *
514  * For example, on Nintendo Switch controllers, normally you'd get:
515  *
516  * (Y)
517  * (X) (B)
518  * (A)
519  *
520  * but if this hint is set, you'll get:
521  *
522  * (X)
523  * (Y) (A)
524  * (B)
525  *
526  * The variable can be set to the following values:
527  * "0" - Report the face buttons by position, as though they were on an Xbox controller.
528  * "1" - Report the face buttons by label instead of position
529  *
530  * The default value is "1". This hint may be set at any time.
531  */
532 #define SDL_HINT_GAMECONTROLLER_USE_BUTTON_LABELS "SDL_GAMECONTROLLER_USE_BUTTON_LABELS"
533 
534 /**
535  * \brief A variable controlling whether grabbing input grabs the keyboard
536  *
537  * This variable can be set to the following values:
538  * "0" - Grab will affect only the mouse
539  * "1" - Grab will affect mouse and keyboard
540  *
541  * By default SDL will not grab the keyboard so system shortcuts still work.
542  */
543 #define SDL_HINT_GRAB_KEYBOARD "SDL_GRAB_KEYBOARD"
544 
545 /**
546  * \brief A variable controlling whether the idle timer is disabled on iOS.
547  *
548  * When an iOS app does not receive touches for some time, the screen is
549  * dimmed automatically. For games where the accelerometer is the only input
550  * this is problematic. This functionality can be disabled by setting this
551  * hint.
552  *
553  * As of SDL 2.0.4, SDL_EnableScreenSaver() and SDL_DisableScreenSaver()
554  * accomplish the same thing on iOS. They should be preferred over this hint.
555  *
556  * This variable can be set to the following values:
557  * "0" - Enable idle timer
558  * "1" - Disable idle timer
559  */
560 #define SDL_HINT_IDLE_TIMER_DISABLED "SDL_IOS_IDLE_TIMER_DISABLED"
561 
562 /**
563  * \brief A variable to control whether certain IMEs should handle text editing internally instead of sending SDL_TEXTEDITING events.
564  *
565  * The variable can be set to the following values:
566  * "0" - SDL_TEXTEDITING events are sent, and it is the application's
567  * responsibility to render the text from these events and
568  * differentiate it somehow from committed text. (default)
569  * "1" - If supported by the IME then SDL_TEXTEDITING events are not sent,
570  * and text that is being composed will be rendered in its own UI.
571  */
572 #define SDL_HINT_IME_INTERNAL_EDITING "SDL_IME_INTERNAL_EDITING"
573 
574 /**
575  * \brief A variable to control whether certain IMEs should show native UI components (such as the Candidate List) instead of suppressing them.
576  *
577  * The variable can be set to the following values:
578  * "0" - Native UI components are not display. (default)
579  * "1" - Native UI components are displayed.
580  */
581 #define SDL_HINT_IME_SHOW_UI "SDL_IME_SHOW_UI"
582 
583 /**
584  * \brief A variable to control if extended IME text support is enabled.
585  * If enabled then SDL_TextEditingExtEvent will be issued if the text would be truncated otherwise.
586  * Additionally SDL_TextInputEvent will be dispatched multiple times so that it is not truncated.
587  *
588  * The variable can be set to the following values:
589  * "0" - Legacy behavior. Text can be truncated, no heap allocations. (default)
590  * "1" - Modern behavior.
591  */
592 #define SDL_HINT_IME_SUPPORT_EXTENDED_TEXT "SDL_IME_SUPPORT_EXTENDED_TEXT"
593 
594 /**
595  * \brief A variable controlling whether the home indicator bar on iPhone X
596  * should be hidden.
597  *
598  * This variable can be set to the following values:
599  * "0" - The indicator bar is not hidden (default for windowed applications)
600  * "1" - The indicator bar is hidden and is shown when the screen is touched (useful for movie playback applications)
601  * "2" - The indicator bar is dim and the first swipe makes it visible and the second swipe performs the "home" action (default for fullscreen applications)
602  */
603 #define SDL_HINT_IOS_HIDE_HOME_INDICATOR "SDL_IOS_HIDE_HOME_INDICATOR"
604 
605 /**
606  * \brief A variable that lets you enable joystick (and gamecontroller) events even when your app is in the background.
607  *
608  * The variable can be set to the following values:
609  * "0" - Disable joystick & gamecontroller input events when the
610  * application is in the background.
611  * "1" - Enable joystick & gamecontroller input events when the
612  * application is in the background.
613  *
614  * The default value is "0". This hint may be set at any time.
615  */
616 #define SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS "SDL_JOYSTICK_ALLOW_BACKGROUND_EVENTS"
617 
618 /**
619  * \brief A variable controlling whether the HIDAPI joystick drivers should be used.
620  *
621  * This variable can be set to the following values:
622  * "0" - HIDAPI drivers are not used
623  * "1" - HIDAPI drivers are used (the default)
624  *
625  * This variable is the default for all drivers, but can be overridden by the hints for specific drivers below.
626  */
627 #define SDL_HINT_JOYSTICK_HIDAPI "SDL_JOYSTICK_HIDAPI"
628 
629 /**
630  * \brief A variable controlling whether the HIDAPI driver for Nintendo GameCube controllers should be used.
631  *
632  * This variable can be set to the following values:
633  * "0" - HIDAPI driver is not used
634  * "1" - HIDAPI driver is used
635  *
636  * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
637  */
638 #define SDL_HINT_JOYSTICK_HIDAPI_GAMECUBE "SDL_JOYSTICK_HIDAPI_GAMECUBE"
639 
640 /**
641  * \brief A variable controlling whether "low_frequency_rumble" and "high_frequency_rumble" is used to implement
642  * the GameCube controller's 3 rumble modes, Stop(0), Rumble(1), and StopHard(2)
643  * this is useful for applications that need full compatibility for things like ADSR envelopes.
644  * Stop is implemented by setting "low_frequency_rumble" to "0" and "high_frequency_rumble" ">0"
645  * Rumble is both at any arbitrary value,
646  * StopHard is implemented by setting both "low_frequency_rumble" and "high_frequency_rumble" to "0"
647  *
648  * This variable can be set to the following values:
649  * "0" - Normal rumble behavior is behavior is used (default)
650  * "1" - Proper GameCube controller rumble behavior is used
651  *
652  */
653 #define SDL_HINT_JOYSTICK_GAMECUBE_RUMBLE_BRAKE "SDL_JOYSTICK_GAMECUBE_RUMBLE_BRAKE"
654 
655  /**
656  * \brief A variable controlling whether Switch Joy-Cons should be treated the same as Switch Pro Controllers when using the HIDAPI driver.
657  *
658  * This variable can be set to the following values:
659  * "0" - basic Joy-Con support with no analog input (the default)
660  * "1" - Joy-Cons treated as half full Pro Controllers with analog inputs and sensors
661  *
662  * This does not combine Joy-Cons into a single controller. That's up to the user.
663  */
664 #define SDL_HINT_JOYSTICK_HIDAPI_JOY_CONS "SDL_JOYSTICK_HIDAPI_JOY_CONS"
665 
666  /**
667  * \brief A variable controlling whether the HIDAPI driver for Amazon Luna controllers connected via Bluetooth should be used.
668  *
669  * This variable can be set to the following values:
670  * "0" - HIDAPI driver is not used
671  * "1" - HIDAPI driver is used
672  *
673  * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
674  */
675 #define SDL_HINT_JOYSTICK_HIDAPI_LUNA "SDL_JOYSTICK_HIDAPI_LUNA"
676 
677 /**
678  * \brief A variable controlling whether the HIDAPI driver for PS4 controllers should be used.
679  *
680  * This variable can be set to the following values:
681  * "0" - HIDAPI driver is not used
682  * "1" - HIDAPI driver is used
683  *
684  * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
685  */
686 #define SDL_HINT_JOYSTICK_HIDAPI_PS4 "SDL_JOYSTICK_HIDAPI_PS4"
687 
688 /**
689  * \brief A variable controlling whether extended input reports should be used for PS4 controllers when using the HIDAPI driver.
690  *
691  * This variable can be set to the following values:
692  * "0" - extended reports are not enabled (the default)
693  * "1" - extended reports
694  *
695  * Extended input reports allow rumble on Bluetooth PS4 controllers, but
696  * break DirectInput handling for applications that don't use SDL.
697  *
698  * Once extended reports are enabled, they can not be disabled without
699  * power cycling the controller.
700  *
701  * For compatibility with applications written for versions of SDL prior
702  * to the introduction of PS5 controller support, this value will also
703  * control the state of extended reports on PS5 controllers when the
704  * SDL_HINT_JOYSTICK_HIDAPI_PS5_RUMBLE hint is not explicitly set.
705  */
706 #define SDL_HINT_JOYSTICK_HIDAPI_PS4_RUMBLE "SDL_JOYSTICK_HIDAPI_PS4_RUMBLE"
707 
708 /**
709  * \brief A variable controlling whether the HIDAPI driver for PS5 controllers should be used.
710  *
711  * This variable can be set to the following values:
712  * "0" - HIDAPI driver is not used
713  * "1" - HIDAPI driver is used
714  *
715  * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
716  */
717 #define SDL_HINT_JOYSTICK_HIDAPI_PS5 "SDL_JOYSTICK_HIDAPI_PS5"
718 
719 /**
720  * \brief A variable controlling whether the player LEDs should be lit to indicate which player is associated with a PS5 controller.
721  *
722  * This variable can be set to the following values:
723  * "0" - player LEDs are not enabled
724  * "1" - player LEDs are enabled (the default)
725  */
726 #define SDL_HINT_JOYSTICK_HIDAPI_PS5_PLAYER_LED "SDL_JOYSTICK_HIDAPI_PS5_PLAYER_LED"
727 
728 /**
729  * \brief A variable controlling whether extended input reports should be used for PS5 controllers when using the HIDAPI driver.
730  *
731  * This variable can be set to the following values:
732  * "0" - extended reports are not enabled (the default)
733  * "1" - extended reports
734  *
735  * Extended input reports allow rumble on Bluetooth PS5 controllers, but
736  * break DirectInput handling for applications that don't use SDL.
737  *
738  * Once extended reports are enabled, they can not be disabled without
739  * power cycling the controller.
740  *
741  * For compatibility with applications written for versions of SDL prior
742  * to the introduction of PS5 controller support, this value defaults to
743  * the value of SDL_HINT_JOYSTICK_HIDAPI_PS4_RUMBLE.
744  */
745 #define SDL_HINT_JOYSTICK_HIDAPI_PS5_RUMBLE "SDL_JOYSTICK_HIDAPI_PS5_RUMBLE"
746 
747 /**
748  * \brief A variable controlling whether the HIDAPI driver for Google Stadia controllers should be used.
749  *
750  * This variable can be set to the following values:
751  * "0" - HIDAPI driver is not used
752  * "1" - HIDAPI driver is used
753  *
754  * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
755  */
756 #define SDL_HINT_JOYSTICK_HIDAPI_STADIA "SDL_JOYSTICK_HIDAPI_STADIA"
757 
758 /**
759  * \brief A variable controlling whether the HIDAPI driver for Steam Controllers should be used.
760  *
761  * This variable can be set to the following values:
762  * "0" - HIDAPI driver is not used
763  * "1" - HIDAPI driver is used for Steam Controllers, which requires Bluetooth access
764  * and may prompt the user for permission on iOS and Android.
765  *
766  * The default is "0"
767  */
768 #define SDL_HINT_JOYSTICK_HIDAPI_STEAM "SDL_JOYSTICK_HIDAPI_STEAM"
769 
770 /**
771  * \brief A variable controlling whether the HIDAPI driver for Nintendo Switch controllers should be used.
772  *
773  * This variable can be set to the following values:
774  * "0" - HIDAPI driver is not used
775  * "1" - HIDAPI driver is used
776  *
777  * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
778  */
779 #define SDL_HINT_JOYSTICK_HIDAPI_SWITCH "SDL_JOYSTICK_HIDAPI_SWITCH"
780 
781 /**
782  * \brief A variable controlling whether the Home button LED should be turned on when a Nintendo Switch controller is opened
783  *
784  * This variable can be set to the following values:
785  * "0" - home button LED is turned off
786  * "1" - home button LED is turned on
787  *
788  * By default the Home button LED state is not changed.
789  */
790 #define SDL_HINT_JOYSTICK_HIDAPI_SWITCH_HOME_LED "SDL_JOYSTICK_HIDAPI_SWITCH_HOME_LED"
791 
792 /**
793  * \brief A variable controlling whether the HIDAPI driver for XBox controllers should be used.
794  *
795  * This variable can be set to the following values:
796  * "0" - HIDAPI driver is not used
797  * "1" - HIDAPI driver is used
798  *
799  * The default is "0" on Windows, otherwise the value of SDL_HINT_JOYSTICK_HIDAPI
800  */
801 #define SDL_HINT_JOYSTICK_HIDAPI_XBOX "SDL_JOYSTICK_HIDAPI_XBOX"
802 
803  /**
804  * \brief A variable controlling whether the RAWINPUT joystick drivers should be used for better handling XInput-capable devices.
805  *
806  * This variable can be set to the following values:
807  * "0" - RAWINPUT drivers are not used
808  * "1" - RAWINPUT drivers are used (the default)
809  */
810 #define SDL_HINT_JOYSTICK_RAWINPUT "SDL_JOYSTICK_RAWINPUT"
811 
812  /**
813  * \brief A variable controlling whether the RAWINPUT driver should pull correlated data from XInput.
814  *
815  * This variable can be set to the following values:
816  * "0" - RAWINPUT driver will only use data from raw input APIs
817  * "1" - RAWINPUT driver will also pull data from XInput, providing
818  * better trigger axes, guide button presses, and rumble support
819  * for Xbox controllers
820  *
821  * The default is "1". This hint applies to any joysticks opened after setting the hint.
822  */
823 #define SDL_HINT_JOYSTICK_RAWINPUT_CORRELATE_XINPUT "SDL_JOYSTICK_RAWINPUT_CORRELATE_XINPUT"
824 
825  /**
826  * \brief A variable controlling whether the ROG Chakram mice should show up as joysticks
827  *
828  * This variable can be set to the following values:
829  * "0" - ROG Chakram mice do not show up as joysticks (the default)
830  * "1" - ROG Chakram mice show up as joysticks
831  */
832 #define SDL_HINT_JOYSTICK_ROG_CHAKRAM "SDL_JOYSTICK_ROG_CHAKRAM"
833 
834  /**
835  * \brief A variable controlling whether a separate thread should be used
836  * for handling joystick detection and raw input messages on Windows
837  *
838  * This variable can be set to the following values:
839  * "0" - A separate thread is not used (the default)
840  * "1" - A separate thread is used for handling raw input messages
841  *
842  */
843 #define SDL_HINT_JOYSTICK_THREAD "SDL_JOYSTICK_THREAD"
844 
845 /**
846  * \brief Determines whether SDL enforces that DRM master is required in order
847  * to initialize the KMSDRM video backend.
848  *
849  * The DRM subsystem has a concept of a "DRM master" which is a DRM client that
850  * has the ability to set planes, set cursor, etc. When SDL is DRM master, it
851  * can draw to the screen using the SDL rendering APIs. Without DRM master, SDL
852  * is still able to process input and query attributes of attached displays,
853  * but it cannot change display state or draw to the screen directly.
854  *
855  * In some cases, it can be useful to have the KMSDRM backend even if it cannot
856  * be used for rendering. An app may want to use SDL for input processing while
857  * using another rendering API (such as an MMAL overlay on Raspberry Pi) or
858  * using its own code to render to DRM overlays that SDL doesn't support.
859  *
860  * This hint must be set before initializing the video subsystem.
861  *
862  * This variable can be set to the following values:
863  * "0" - SDL will allow usage of the KMSDRM backend without DRM master
864  * "1" - SDL Will require DRM master to use the KMSDRM backend (default)
865  */
866 #define SDL_HINT_KMSDRM_REQUIRE_DRM_MASTER "SDL_KMSDRM_REQUIRE_DRM_MASTER"
867 
868  /**
869  * \brief A comma separated list of devices to open as joysticks
870  *
871  * This variable is currently only used by the Linux joystick driver.
872  */
873 #define SDL_HINT_JOYSTICK_DEVICE "SDL_JOYSTICK_DEVICE"
874 
875  /**
876  * \brief A variable controlling whether joysticks on Linux will always treat 'hat' axis inputs (ABS_HAT0X - ABS_HAT3Y) as 8-way digital hats without checking whether they may be analog.
877  *
878  * This variable can be set to the following values:
879  * "0" - Only map hat axis inputs to digital hat outputs if the input axes appear to actually be digital (the default)
880  * "1" - Always handle the input axes numbered ABS_HAT0X to ABS_HAT3Y as digital hats
881  */
882 #define SDL_HINT_LINUX_DIGITAL_HATS "SDL_LINUX_DIGITAL_HATS"
883 
884  /**
885  * \brief A variable controlling whether digital hats on Linux will apply deadzones to their underlying input axes or use unfiltered values.
886  *
887  * This variable can be set to the following values:
888  * "0" - Return digital hat values based on unfiltered input axis values
889  * "1" - Return digital hat values with deadzones on the input axes taken into account (the default)
890  */
891 #define SDL_HINT_LINUX_HAT_DEADZONES "SDL_LINUX_HAT_DEADZONES"
892 
893  /**
894  * \brief A variable controlling whether to use the classic /dev/input/js* joystick interface or the newer /dev/input/event* joystick interface on Linux
895  *
896  * This variable can be set to the following values:
897  * "0" - Use /dev/input/event*
898  * "1" - Use /dev/input/js*
899  *
900  * By default the /dev/input/event* interfaces are used
901  */
902 #define SDL_HINT_LINUX_JOYSTICK_CLASSIC "SDL_LINUX_JOYSTICK_CLASSIC"
903 
904  /**
905  * \brief A variable controlling whether joysticks on Linux adhere to their HID-defined deadzones or return unfiltered values.
906  *
907  * This variable can be set to the following values:
908  * "0" - Return unfiltered joystick axis values (the default)
909  * "1" - Return axis values with deadzones taken into account
910  */
911 #define SDL_HINT_LINUX_JOYSTICK_DEADZONES "SDL_LINUX_JOYSTICK_DEADZONES"
912 
913 /**
914 * \brief When set don't force the SDL app to become a foreground process
915 *
916 * This hint only applies to Mac OS X.
917 *
918 */
919 #define SDL_HINT_MAC_BACKGROUND_APP "SDL_MAC_BACKGROUND_APP"
920 
921 /**
922  * \brief A variable that determines whether ctrl+click should generate a right-click event on Mac
923  *
924  * If present, holding ctrl while left clicking will generate a right click
925  * event when on Mac.
926  */
927 #define SDL_HINT_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK "SDL_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK"
928 
929 /**
930  * \brief A variable setting the double click radius, in pixels.
931  */
932 #define SDL_HINT_MOUSE_DOUBLE_CLICK_RADIUS "SDL_MOUSE_DOUBLE_CLICK_RADIUS"
933 
934 /**
935  * \brief A variable setting the double click time, in milliseconds.
936  */
937 #define SDL_HINT_MOUSE_DOUBLE_CLICK_TIME "SDL_MOUSE_DOUBLE_CLICK_TIME"
938 
939 /**
940  * \brief Allow mouse click events when clicking to focus an SDL window
941  *
942  * This variable can be set to the following values:
943  * "0" - Ignore mouse clicks that activate a window
944  * "1" - Generate events for mouse clicks that activate a window
945  *
946  * By default SDL will ignore mouse clicks that activate a window
947  */
948 #define SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH "SDL_MOUSE_FOCUS_CLICKTHROUGH"
949 
950 /**
951  * \brief A variable setting the speed scale for mouse motion, in floating point, when the mouse is not in relative mode
952  */
953 #define SDL_HINT_MOUSE_NORMAL_SPEED_SCALE "SDL_MOUSE_NORMAL_SPEED_SCALE"
954 
955 /**
956  * \brief A variable controlling whether relative mouse mode constrains the mouse to the center of the window
957  *
958  * This variable can be set to the following values:
959  * "0" - Relative mouse mode constrains the mouse to the window
960  * "1" - Relative mouse mode constrains the mouse to the center of the window
961  *
962  * Constraining to the center of the window works better for FPS games and when the
963  * application is running over RDP. Constraining to the whole window works better
964  * for 2D games and increases the chance that the mouse will be in the correct
965  * position when using high DPI mice.
966  *
967  * By default SDL will constrain the mouse to the center of the window
968  */
969 #define SDL_HINT_MOUSE_RELATIVE_MODE_CENTER "SDL_MOUSE_RELATIVE_MODE_CENTER"
970 
971 /**
972  * \brief A variable controlling whether relative mouse mode is implemented using mouse warping
973  *
974  * This variable can be set to the following values:
975  * "0" - Relative mouse mode uses raw input
976  * "1" - Relative mouse mode uses mouse warping
977  *
978  * By default SDL will use raw input for relative mouse mode
979  */
980 #define SDL_HINT_MOUSE_RELATIVE_MODE_WARP "SDL_MOUSE_RELATIVE_MODE_WARP"
981 
982 /**
983  * \brief A variable controlling whether relative mouse motion is affected by renderer scaling
984  *
985  * This variable can be set to the following values:
986  * "0" - Relative motion is unaffected by DPI or renderer's logical size
987  * "1" - Relative motion is scaled according to DPI scaling and logical size
988  *
989  * By default relative mouse deltas are affected by DPI and renderer scaling
990  */
991 #define SDL_HINT_MOUSE_RELATIVE_SCALING "SDL_MOUSE_RELATIVE_SCALING"
992 
993 /**
994  * \brief A variable setting the scale for mouse motion, in floating point, when the mouse is in relative mode
995  */
996 #define SDL_HINT_MOUSE_RELATIVE_SPEED_SCALE "SDL_MOUSE_RELATIVE_SPEED_SCALE"
997 
998 /**
999  * \brief A variable controlling whether mouse events should generate synthetic touch events
1000  *
1001  * This variable can be set to the following values:
1002  * "0" - Mouse events will not generate touch events (default for desktop platforms)
1003  * "1" - Mouse events will generate touch events (default for mobile platforms, such as Android and iOS)
1004  */
1005 #define SDL_HINT_MOUSE_TOUCH_EVENTS "SDL_MOUSE_TOUCH_EVENTS"
1006 
1007 /**
1008  * \brief A variable controlling whether the mouse is captured while mouse buttons are pressed
1009  *
1010  * This variable can be set to the following values:
1011  * "0" - The mouse is not captured while mouse buttons are pressed
1012  * "1" - The mouse is captured while mouse buttons are pressed
1013  *
1014  * By default the mouse is captured while mouse buttons are pressed so if the mouse is dragged
1015  * outside the window, the application continues to receive mouse events until the button is
1016  * released.
1017  */
1018 #define SDL_HINT_MOUSE_AUTO_CAPTURE "SDL_MOUSE_AUTO_CAPTURE"
1019 
1020 /**
1021  * \brief Tell SDL not to catch the SIGINT or SIGTERM signals.
1022  *
1023  * This hint only applies to Unix-like platforms, and should set before
1024  * any calls to SDL_Init()
1025  *
1026  * The variable can be set to the following values:
1027  * "0" - SDL will install a SIGINT and SIGTERM handler, and when it
1028  * catches a signal, convert it into an SDL_QUIT event.
1029  * "1" - SDL will not install a signal handler at all.
1030  */
1031 #define SDL_HINT_NO_SIGNAL_HANDLERS "SDL_NO_SIGNAL_HANDLERS"
1032 
1033 /**
1034  * \brief A variable controlling what driver to use for OpenGL ES contexts.
1035  *
1036  * On some platforms, currently Windows and X11, OpenGL drivers may support
1037  * creating contexts with an OpenGL ES profile. By default SDL uses these
1038  * profiles, when available, otherwise it attempts to load an OpenGL ES
1039  * library, e.g. that provided by the ANGLE project. This variable controls
1040  * whether SDL follows this default behaviour or will always load an
1041  * OpenGL ES library.
1042  *
1043  * Circumstances where this is useful include
1044  * - Testing an app with a particular OpenGL ES implementation, e.g ANGLE,
1045  * or emulator, e.g. those from ARM, Imagination or Qualcomm.
1046  * - Resolving OpenGL ES function addresses at link time by linking with
1047  * the OpenGL ES library instead of querying them at run time with
1048  * SDL_GL_GetProcAddress().
1049  *
1050  * Caution: for an application to work with the default behaviour across
1051  * different OpenGL drivers it must query the OpenGL ES function
1052  * addresses at run time using SDL_GL_GetProcAddress().
1053  *
1054  * This variable is ignored on most platforms because OpenGL ES is native
1055  * or not supported.
1056  *
1057  * This variable can be set to the following values:
1058  * "0" - Use ES profile of OpenGL, if available. (Default when not set.)
1059  * "1" - Load OpenGL ES library using the default library names.
1060  *
1061  */
1062 #define SDL_HINT_OPENGL_ES_DRIVER "SDL_OPENGL_ES_DRIVER"
1063 
1064 /**
1065  * \brief A variable controlling which orientations are allowed on iOS/Android.
1066  *
1067  * In some circumstances it is necessary to be able to explicitly control
1068  * which UI orientations are allowed.
1069  *
1070  * This variable is a space delimited list of the following values:
1071  * "LandscapeLeft", "LandscapeRight", "Portrait" "PortraitUpsideDown"
1072  */
1073 #define SDL_HINT_ORIENTATIONS "SDL_IOS_ORIENTATIONS"
1074 
1075 /**
1076  * \brief A variable controlling the use of a sentinel event when polling the event queue
1077  *
1078  * This variable can be set to the following values:
1079  * "0" - Disable poll sentinels
1080  * "1" - Enable poll sentinels
1081  *
1082  * When polling for events, SDL_PumpEvents is used to gather new events from devices.
1083  * If a device keeps producing new events between calls to SDL_PumpEvents, a poll loop will
1084  * become stuck until the new events stop.
1085  * This is most noticable when moving a high frequency mouse.
1086  *
1087  * By default, poll sentinels are enabled.
1088  */
1089 #define SDL_HINT_POLL_SENTINEL "SDL_POLL_SENTINEL"
1090 
1091 /**
1092  * \brief Override for SDL_GetPreferredLocales()
1093  *
1094  * If set, this will be favored over anything the OS might report for the
1095  * user's preferred locales. Changing this hint at runtime will not generate
1096  * a SDL_LOCALECHANGED event (but if you can change the hint, you can push
1097  * your own event, if you want).
1098  *
1099  * The format of this hint is a comma-separated list of language and locale,
1100  * combined with an underscore, as is a common format: "en_GB". Locale is
1101  * optional: "en". So you might have a list like this: "en_GB,jp,es_PT"
1102  */
1103 #define SDL_HINT_PREFERRED_LOCALES "SDL_PREFERRED_LOCALES"
1104 
1105 /**
1106  * \brief A variable describing the content orientation on QtWayland-based platforms.
1107  *
1108  * On QtWayland platforms, windows are rotated client-side to allow for custom
1109  * transitions. In order to correctly position overlays (e.g. volume bar) and
1110  * gestures (e.g. events view, close/minimize gestures), the system needs to
1111  * know in which orientation the application is currently drawing its contents.
1112  *
1113  * This does not cause the window to be rotated or resized, the application
1114  * needs to take care of drawing the content in the right orientation (the
1115  * framebuffer is always in portrait mode).
1116  *
1117  * This variable can be one of the following values:
1118  * "primary" (default), "portrait", "landscape", "inverted-portrait", "inverted-landscape"
1119  */
1120 #define SDL_HINT_QTWAYLAND_CONTENT_ORIENTATION "SDL_QTWAYLAND_CONTENT_ORIENTATION"
1121 
1122 /**
1123  * \brief Flags to set on QtWayland windows to integrate with the native window manager.
1124  *
1125  * On QtWayland platforms, this hint controls the flags to set on the windows.
1126  * For example, on Sailfish OS "OverridesSystemGestures" disables swipe gestures.
1127  *
1128  * This variable is a space-separated list of the following values (empty = no flags):
1129  * "OverridesSystemGestures", "StaysOnTop", "BypassWindowManager"
1130  */
1131 #define SDL_HINT_QTWAYLAND_WINDOW_FLAGS "SDL_QTWAYLAND_WINDOW_FLAGS"
1132 
1133 /**
1134  * \brief A variable controlling whether the 2D render API is compatible or efficient.
1135  *
1136  * This variable can be set to the following values:
1137  *
1138  * "0" - Don't use batching to make rendering more efficient.
1139  * "1" - Use batching, but might cause problems if app makes its own direct OpenGL calls.
1140  *
1141  * Up to SDL 2.0.9, the render API would draw immediately when requested. Now
1142  * it batches up draw requests and sends them all to the GPU only when forced
1143  * to (during SDL_RenderPresent, when changing render targets, by updating a
1144  * texture that the batch needs, etc). This is significantly more efficient,
1145  * but it can cause problems for apps that expect to render on top of the
1146  * render API's output. As such, SDL will disable batching if a specific
1147  * render backend is requested (since this might indicate that the app is
1148  * planning to use the underlying graphics API directly). This hint can
1149  * be used to explicitly request batching in this instance. It is a contract
1150  * that you will either never use the underlying graphics API directly, or
1151  * if you do, you will call SDL_RenderFlush() before you do so any current
1152  * batch goes to the GPU before your work begins. Not following this contract
1153  * will result in undefined behavior.
1154  */
1155 #define SDL_HINT_RENDER_BATCHING "SDL_RENDER_BATCHING"
1156 
1157 /**
1158  * \brief A variable controlling how the 2D render API renders lines
1159  *
1160  * This variable can be set to the following values:
1161  * "0" - Use the default line drawing method (Bresenham's line algorithm as of SDL 2.0.20)
1162  * "1" - Use the driver point API using Bresenham's line algorithm (correct, draws many points)
1163  * "2" - Use the driver line API (occasionally misses line endpoints based on hardware driver quirks, was the default before 2.0.20)
1164  * "3" - Use the driver geometry API (correct, draws thicker diagonal lines)
1165  *
1166  * This variable should be set when the renderer is created.
1167  */
1168 #define SDL_HINT_RENDER_LINE_METHOD "SDL_RENDER_LINE_METHOD"
1169 
1170 /**
1171  * \brief A variable controlling whether to enable Direct3D 11+'s Debug Layer.
1172  *
1173  * This variable does not have any effect on the Direct3D 9 based renderer.
1174  *
1175  * This variable can be set to the following values:
1176  * "0" - Disable Debug Layer use
1177  * "1" - Enable Debug Layer use
1178  *
1179  * By default, SDL does not use Direct3D Debug Layer.
1180  */
1181 #define SDL_HINT_RENDER_DIRECT3D11_DEBUG "SDL_RENDER_DIRECT3D11_DEBUG"
1182 
1183 /**
1184  * \brief A variable controlling whether the Direct3D device is initialized for thread-safe operations.
1185  *
1186  * This variable can be set to the following values:
1187  * "0" - Thread-safety is not enabled (faster)
1188  * "1" - Thread-safety is enabled
1189  *
1190  * By default the Direct3D device is created with thread-safety disabled.
1191  */
1192 #define SDL_HINT_RENDER_DIRECT3D_THREADSAFE "SDL_RENDER_DIRECT3D_THREADSAFE"
1193 
1194 /**
1195  * \brief A variable specifying which render driver to use.
1196  *
1197  * If the application doesn't pick a specific renderer to use, this variable
1198  * specifies the name of the preferred renderer. If the preferred renderer
1199  * can't be initialized, the normal default renderer is used.
1200  *
1201  * This variable is case insensitive and can be set to the following values:
1202  * "direct3d"
1203  * "opengl"
1204  * "opengles2"
1205  * "opengles"
1206  * "metal"
1207  * "software"
1208  *
1209  * The default varies by platform, but it's the first one in the list that
1210  * is available on the current platform.
1211  */
1212 #define SDL_HINT_RENDER_DRIVER "SDL_RENDER_DRIVER"
1213 
1214 /**
1215  * \brief A variable controlling the scaling policy for SDL_RenderSetLogicalSize.
1216  *
1217  * This variable can be set to the following values:
1218  * "0" or "letterbox" - Uses letterbox/sidebars to fit the entire rendering on screen
1219  * "1" or "overscan" - Will zoom the rendering so it fills the entire screen, allowing edges to be drawn offscreen
1220  *
1221  * By default letterbox is used
1222  */
1223 #define SDL_HINT_RENDER_LOGICAL_SIZE_MODE "SDL_RENDER_LOGICAL_SIZE_MODE"
1224 
1225 /**
1226  * \brief A variable controlling whether the OpenGL render driver uses shaders if they are available.
1227  *
1228  * This variable can be set to the following values:
1229  * "0" - Disable shaders
1230  * "1" - Enable shaders
1231  *
1232  * By default shaders are used if OpenGL supports them.
1233  */
1234 #define SDL_HINT_RENDER_OPENGL_SHADERS "SDL_RENDER_OPENGL_SHADERS"
1235 
1236 /**
1237  * \brief A variable controlling the scaling quality
1238  *
1239  * This variable can be set to the following values:
1240  * "0" or "nearest" - Nearest pixel sampling
1241  * "1" or "linear" - Linear filtering (supported by OpenGL and Direct3D)
1242  * "2" or "best" - Currently this is the same as "linear"
1243  *
1244  * By default nearest pixel sampling is used
1245  */
1246 #define SDL_HINT_RENDER_SCALE_QUALITY "SDL_RENDER_SCALE_QUALITY"
1247 
1248 /**
1249  * \brief A variable controlling whether updates to the SDL screen surface should be synchronized with the vertical refresh, to avoid tearing.
1250  *
1251  * This variable can be set to the following values:
1252  * "0" - Disable vsync
1253  * "1" - Enable vsync
1254  *
1255  * By default SDL does not sync screen surface updates with vertical refresh.
1256  */
1257 #define SDL_HINT_RENDER_VSYNC "SDL_RENDER_VSYNC"
1258 
1259  /**
1260  * \brief A variable to control whether the return key on the soft keyboard
1261  * should hide the soft keyboard on Android and iOS.
1262  *
1263  * The variable can be set to the following values:
1264  * "0" - The return key will be handled as a key event. This is the behaviour of SDL <= 2.0.3. (default)
1265  * "1" - The return key will hide the keyboard.
1266  *
1267  * The value of this hint is used at runtime, so it can be changed at any time.
1268  */
1269 #define SDL_HINT_RETURN_KEY_HIDES_IME "SDL_RETURN_KEY_HIDES_IME"
1270 
1271 /**
1272  * \brief Tell SDL which Dispmanx layer to use on a Raspberry PI
1273  *
1274  * Also known as Z-order. The variable can take a negative or positive value.
1275  * The default is 10000.
1276  */
1277 #define SDL_HINT_RPI_VIDEO_LAYER "SDL_RPI_VIDEO_LAYER"
1278 
1279 /**
1280  * \brief Specify an "activity name" for screensaver inhibition.
1281  *
1282  * Some platforms, notably Linux desktops, list the applications which are
1283  * inhibiting the screensaver or other power-saving features.
1284  *
1285  * This hint lets you specify the "activity name" sent to the OS when
1286  * SDL_DisableScreenSaver() is used (or the screensaver is automatically
1287  * disabled). The contents of this hint are used when the screensaver is
1288  * disabled. You should use a string that describes what your program is doing
1289  * (and, therefore, why the screensaver is disabled). For example, "Playing a
1290  * game" or "Watching a video".
1291  *
1292  * Setting this to "" or leaving it unset will have SDL use a reasonable
1293  * default: "Playing a game" or something similar.
1294  *
1295  * On targets where this is not supported, this hint does nothing.
1296  */
1297 #define SDL_HINT_SCREENSAVER_INHIBIT_ACTIVITY_NAME "SDL_SCREENSAVER_INHIBIT_ACTIVITY_NAME"
1298 
1299 /**
1300  * \brief Specifies whether SDL_THREAD_PRIORITY_TIME_CRITICAL should be treated as realtime.
1301  *
1302  * On some platforms, like Linux, a realtime priority thread may be subject to restrictions
1303  * that require special handling by the application. This hint exists to let SDL know that
1304  * the app is prepared to handle said restrictions.
1305  *
1306  * On Linux, SDL will apply the following configuration to any thread that becomes realtime:
1307  * * The SCHED_RESET_ON_FORK bit will be set on the scheduling policy,
1308  * * An RLIMIT_RTTIME budget will be configured to the rtkit specified limit.
1309  * * Exceeding this limit will result in the kernel sending SIGKILL to the app,
1310  * * Refer to the man pages for more information.
1311  *
1312  * This variable can be set to the following values:
1313  * "0" - default platform specific behaviour
1314  * "1" - Force SDL_THREAD_PRIORITY_TIME_CRITICAL to a realtime scheduling policy
1315  */
1316 #define SDL_HINT_THREAD_FORCE_REALTIME_TIME_CRITICAL "SDL_THREAD_FORCE_REALTIME_TIME_CRITICAL"
1317 
1318 /**
1319 * \brief A string specifying additional information to use with SDL_SetThreadPriority.
1320 *
1321 * By default SDL_SetThreadPriority will make appropriate system changes in order to
1322 * apply a thread priority. For example on systems using pthreads the scheduler policy
1323 * is changed automatically to a policy that works well with a given priority.
1324 * Code which has specific requirements can override SDL's default behavior with this hint.
1325 *
1326 * pthread hint values are "current", "other", "fifo" and "rr".
1327 * Currently no other platform hint values are defined but may be in the future.
1328 *
1329 * \note On Linux, the kernel may send SIGKILL to realtime tasks which exceed the distro
1330 * configured execution budget for rtkit. This budget can be queried through RLIMIT_RTTIME
1331 * after calling SDL_SetThreadPriority().
1332 */
1333 #define SDL_HINT_THREAD_PRIORITY_POLICY "SDL_THREAD_PRIORITY_POLICY"
1334 
1335 /**
1336 * \brief A string specifying SDL's threads stack size in bytes or "0" for the backend's default size
1337 *
1338 * Use this hint in case you need to set SDL's threads stack size to other than the default.
1339 * This is specially useful if you build SDL against a non glibc libc library (such as musl) which
1340 * provides a relatively small default thread stack size (a few kilobytes versus the default 8MB glibc uses).
1341 * Support for this hint is currently available only in the pthread, Windows, and PSP backend.
1342 *
1343 * Instead of this hint, in 2.0.9 and later, you can use
1344 * SDL_CreateThreadWithStackSize(). This hint only works with the classic
1345 * SDL_CreateThread().
1346 */
1347 #define SDL_HINT_THREAD_STACK_SIZE "SDL_THREAD_STACK_SIZE"
1348 
1349 /**
1350  * \brief A variable that controls the timer resolution, in milliseconds.
1351  *
1352  * The higher resolution the timer, the more frequently the CPU services
1353  * timer interrupts, and the more precise delays are, but this takes up
1354  * power and CPU time. This hint is only used on Windows.
1355  *
1356  * See this blog post for more information:
1357  * http://randomascii.wordpress.com/2013/07/08/windows-timer-resolution-megawatts-wasted/
1358  *
1359  * If this variable is set to "0", the system timer resolution is not set.
1360  *
1361  * The default value is "1". This hint may be set at any time.
1362  */
1363 #define SDL_HINT_TIMER_RESOLUTION "SDL_TIMER_RESOLUTION"
1364 
1365 /**
1366  * \brief A variable controlling whether touch events should generate synthetic mouse events
1367  *
1368  * This variable can be set to the following values:
1369  * "0" - Touch events will not generate mouse events
1370  * "1" - Touch events will generate mouse events
1371  *
1372  * By default SDL will generate mouse events for touch events
1373  */
1374 #define SDL_HINT_TOUCH_MOUSE_EVENTS "SDL_TOUCH_MOUSE_EVENTS"
1375 
1376 /**
1377  * \brief A variable controlling which touchpad should generate synthetic mouse events
1378  *
1379  * This variable can be set to the following values:
1380  * "0" - Only front touchpad should generate mouse events. Default
1381  * "1" - Only back touchpad should generate mouse events.
1382  * "2" - Both touchpads should generate mouse events.
1383  *
1384  * By default SDL will generate mouse events for all touch devices
1385  */
1386 #define SDL_HINT_VITA_TOUCH_MOUSE_DEVICE "SDL_HINT_VITA_TOUCH_MOUSE_DEVICE"
1387 
1388 /**
1389  * \brief A variable controlling whether the Android / tvOS remotes
1390  * should be listed as joystick devices, instead of sending keyboard events.
1391  *
1392  * This variable can be set to the following values:
1393  * "0" - Remotes send enter/escape/arrow key events
1394  * "1" - Remotes are available as 2 axis, 2 button joysticks (the default).
1395  */
1396 #define SDL_HINT_TV_REMOTE_AS_JOYSTICK "SDL_TV_REMOTE_AS_JOYSTICK"
1397 
1398 /**
1399  * \brief A variable controlling whether the screensaver is enabled.
1400  *
1401  * This variable can be set to the following values:
1402  * "0" - Disable screensaver
1403  * "1" - Enable screensaver
1404  *
1405  * By default SDL will disable the screensaver.
1406  */
1407 #define SDL_HINT_VIDEO_ALLOW_SCREENSAVER "SDL_VIDEO_ALLOW_SCREENSAVER"
1408 
1409 /**
1410  * \brief Tell the video driver that we only want a double buffer.
1411  *
1412  * By default, most lowlevel 2D APIs will use a triple buffer scheme that
1413  * wastes no CPU time on waiting for vsync after issuing a flip, but
1414  * introduces a frame of latency. On the other hand, using a double buffer
1415  * scheme instead is recommended for cases where low latency is an important
1416  * factor because we save a whole frame of latency.
1417  * We do so by waiting for vsync immediately after issuing a flip, usually just
1418  * after eglSwapBuffers call in the backend's *_SwapWindow function.
1419  *
1420  * Since it's driver-specific, it's only supported where possible and
1421  * implemented. Currently supported the following drivers:
1422  *
1423  * - KMSDRM (kmsdrm)
1424  * - Raspberry Pi (raspberrypi)
1425  */
1426 #define SDL_HINT_VIDEO_DOUBLE_BUFFER "SDL_VIDEO_DOUBLE_BUFFER"
1427 
1428 /**
1429  * \brief A variable controlling whether the EGL window is allowed to be
1430  * composited as transparent, rather than opaque.
1431  *
1432  * Most window systems will always render windows opaque, even if the surface
1433  * format has an alpha channel. This is not always true, however, so by default
1434  * SDL will try to enforce opaque composition. To override this behavior, you
1435  * can set this hint to "1".
1436  */
1437 #define SDL_HINT_VIDEO_EGL_ALLOW_TRANSPARENCY "SDL_VIDEO_EGL_ALLOW_TRANSPARENCY"
1438 
1439 /**
1440  * \brief A variable controlling whether the graphics context is externally managed.
1441  *
1442  * This variable can be set to the following values:
1443  * "0" - SDL will manage graphics contexts that are attached to windows.
1444  * "1" - Disable graphics context management on windows.
1445  *
1446  * By default SDL will manage OpenGL contexts in certain situations. For example, on Android the
1447  * context will be automatically saved and restored when pausing the application. Additionally, some
1448  * platforms will assume usage of OpenGL if Vulkan isn't used. Setting this to "1" will prevent this
1449  * behavior, which is desireable when the application manages the graphics context, such as
1450  * an externally managed OpenGL context or attaching a Vulkan surface to the window.
1451  */
1452 #define SDL_HINT_VIDEO_EXTERNAL_CONTEXT "SDL_VIDEO_EXTERNAL_CONTEXT"
1453 
1454 /**
1455  * \brief If set to 1, then do not allow high-DPI windows. ("Retina" on Mac and iOS)
1456  */
1457 #define SDL_HINT_VIDEO_HIGHDPI_DISABLED "SDL_VIDEO_HIGHDPI_DISABLED"
1458 
1459 /**
1460  * \brief A variable that dictates policy for fullscreen Spaces on Mac OS X.
1461  *
1462  * This hint only applies to Mac OS X.
1463  *
1464  * The variable can be set to the following values:
1465  * "0" - Disable Spaces support (FULLSCREEN_DESKTOP won't use them and
1466  * SDL_WINDOW_RESIZABLE windows won't offer the "fullscreen"
1467  * button on their titlebars).
1468  * "1" - Enable Spaces support (FULLSCREEN_DESKTOP will use them and
1469  * SDL_WINDOW_RESIZABLE windows will offer the "fullscreen"
1470  * button on their titlebars).
1471  *
1472  * The default value is "1". Spaces are disabled regardless of this hint if
1473  * the OS isn't at least Mac OS X Lion (10.7). This hint must be set before
1474  * any windows are created.
1475  */
1476 #define SDL_HINT_VIDEO_MAC_FULLSCREEN_SPACES "SDL_VIDEO_MAC_FULLSCREEN_SPACES"
1477 
1478 /**
1479  * \brief Minimize your SDL_Window if it loses key focus when in fullscreen mode. Defaults to false.
1480  * \warning Before SDL 2.0.14, this defaulted to true! In 2.0.14, we're
1481  * seeing if "true" causes more problems than it solves in modern times.
1482  *
1483  */
1484 #define SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS "SDL_VIDEO_MINIMIZE_ON_FOCUS_LOSS"
1485 
1486 /**
1487  * \brief A variable controlling whether the libdecor Wayland backend is allowed to be used.
1488  *
1489  * This variable can be set to the following values:
1490  * "0" - libdecor use is disabled.
1491  * "1" - libdecor use is enabled (default).
1492  *
1493  * libdecor is used over xdg-shell when xdg-decoration protocol is unavailable.
1494  */
1495 #define SDL_HINT_VIDEO_WAYLAND_ALLOW_LIBDECOR "SDL_VIDEO_WAYLAND_ALLOW_LIBDECOR"
1496 
1497 /**
1498  * \brief A variable controlling whether the libdecor Wayland backend is preferred over native decrations.
1499  *
1500  * When this hint is set, libdecor will be used to provide window decorations, even if xdg-decoration is
1501  * available. (Note that, by default, libdecor will use xdg-decoration itself if available).
1502  *
1503  * This variable can be set to the following values:
1504  * "0" - libdecor is enabled only if server-side decorations are unavailable.
1505  * "1" - libdecor is always enabled if available.
1506  *
1507  * libdecor is used over xdg-shell when xdg-decoration protocol is unavailable.
1508  */
1509 #define SDL_HINT_VIDEO_WAYLAND_PREFER_LIBDECOR "SDL_VIDEO_WAYLAND_PREFER_LIBDECOR"
1510 
1511 /**
1512 * \brief A variable that is the address of another SDL_Window* (as a hex string formatted with "%p").
1513 *
1514 * If this hint is set before SDL_CreateWindowFrom() and the SDL_Window* it is set to has
1515 * SDL_WINDOW_OPENGL set (and running on WGL only, currently), then two things will occur on the newly
1516 * created SDL_Window:
1517 *
1518 * 1. Its pixel format will be set to the same pixel format as this SDL_Window. This is
1519 * needed for example when sharing an OpenGL context across multiple windows.
1520 *
1521 * 2. The flag SDL_WINDOW_OPENGL will be set on the new window so it can be used for
1522 * OpenGL rendering.
1523 *
1524 * This variable can be set to the following values:
1525 * The address (as a string "%p") of the SDL_Window* that new windows created with SDL_CreateWindowFrom() should
1526 * share a pixel format with.
1527 */
1528 #define SDL_HINT_VIDEO_WINDOW_SHARE_PIXEL_FORMAT "SDL_VIDEO_WINDOW_SHARE_PIXEL_FORMAT"
1529 
1530 /**
1531  * \brief When calling SDL_CreateWindowFrom(), make the window compatible with OpenGL.
1532  *
1533  * This variable can be set to the following values:
1534  * "0" - Don't add any graphics flags to the SDL_WindowFlags
1535  * "1" - Add SDL_WINDOW_OPENGL to the SDL_WindowFlags
1536  *
1537  * By default SDL will not make the foreign window compatible with OpenGL.
1538  */
1539 #define SDL_HINT_VIDEO_FOREIGN_WINDOW_OPENGL "SDL_VIDEO_FOREIGN_WINDOW_OPENGL"
1540 
1541 /**
1542  * \brief When calling SDL_CreateWindowFrom(), make the window compatible with Vulkan.
1543  *
1544  * This variable can be set to the following values:
1545  * "0" - Don't add any graphics flags to the SDL_WindowFlags
1546  * "1" - Add SDL_WINDOW_VULKAN to the SDL_WindowFlags
1547  *
1548  * By default SDL will not make the foreign window compatible with Vulkan.
1549  */
1550 #define SDL_HINT_VIDEO_FOREIGN_WINDOW_VULKAN "SDL_VIDEO_FOREIGN_WINDOW_VULKAN"
1551 
1552 /**
1553 * \brief A variable specifying which shader compiler to preload when using the Chrome ANGLE binaries
1554 *
1555 * SDL has EGL and OpenGL ES2 support on Windows via the ANGLE project. It
1556 * can use two different sets of binaries, those compiled by the user from source
1557 * or those provided by the Chrome browser. In the later case, these binaries require
1558 * that SDL loads a DLL providing the shader compiler.
1559 *
1560 * This variable can be set to the following values:
1561 * "d3dcompiler_46.dll" - default, best for Vista or later.
1562 * "d3dcompiler_43.dll" - for XP support.
1563 * "none" - do not load any library, useful if you compiled ANGLE from source and included the compiler in your binaries.
1564 *
1565 */
1566 #define SDL_HINT_VIDEO_WIN_D3DCOMPILER "SDL_VIDEO_WIN_D3DCOMPILER"
1567 
1568 /**
1569  * \brief A variable controlling whether X11 should use GLX or EGL by default
1570  *
1571  * This variable can be set to the following values:
1572  * "0" - Use GLX
1573  * "1" - Use EGL
1574  *
1575  * By default SDL will use GLX when both are present.
1576  */
1577 #define SDL_HINT_VIDEO_X11_FORCE_EGL "SDL_VIDEO_X11_FORCE_EGL"
1578 
1579 /**
1580  * \brief A variable controlling whether the X11 _NET_WM_BYPASS_COMPOSITOR hint should be used.
1581  *
1582  * This variable can be set to the following values:
1583  * "0" - Disable _NET_WM_BYPASS_COMPOSITOR
1584  * "1" - Enable _NET_WM_BYPASS_COMPOSITOR
1585  *
1586  * By default SDL will use _NET_WM_BYPASS_COMPOSITOR
1587  *
1588  */
1589 #define SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR "SDL_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR"
1590 
1591 /**
1592  * \brief A variable controlling whether the X11 _NET_WM_PING protocol should be supported.
1593  *
1594  * This variable can be set to the following values:
1595  * "0" - Disable _NET_WM_PING
1596  * "1" - Enable _NET_WM_PING
1597  *
1598  * By default SDL will use _NET_WM_PING, but for applications that know they
1599  * will not always be able to respond to ping requests in a timely manner they can
1600  * turn it off to avoid the window manager thinking the app is hung.
1601  * The hint is checked in CreateWindow.
1602  */
1603 #define SDL_HINT_VIDEO_X11_NET_WM_PING "SDL_VIDEO_X11_NET_WM_PING"
1604 
1605 /**
1606  * \brief A variable forcing the visual ID chosen for new X11 windows
1607  *
1608  */
1609 #define SDL_HINT_VIDEO_X11_WINDOW_VISUALID "SDL_VIDEO_X11_WINDOW_VISUALID"
1610 
1611 /**
1612  * \brief A no-longer-used variable controlling whether the X11 Xinerama extension should be used.
1613  *
1614  * Before SDL 2.0.24, this would let apps and users disable Xinerama support on X11.
1615  * Now SDL never uses Xinerama, and does not check for this hint at all.
1616  * The preprocessor define is left here for source compatibility.
1617  */
1618 #define SDL_HINT_VIDEO_X11_XINERAMA "SDL_VIDEO_X11_XINERAMA"
1619 
1620 /**
1621  * \brief A variable controlling whether the X11 XRandR extension should be used.
1622  *
1623  * This variable can be set to the following values:
1624  * "0" - Disable XRandR
1625  * "1" - Enable XRandR
1626  *
1627  * By default SDL will use XRandR.
1628  */
1629 #define SDL_HINT_VIDEO_X11_XRANDR "SDL_VIDEO_X11_XRANDR"
1630 
1631 /**
1632  * \brief A no-longer-used variable controlling whether the X11 VidMode extension should be used.
1633  *
1634  * Before SDL 2.0.24, this would let apps and users disable XVidMode support on X11.
1635  * Now SDL never uses XVidMode, and does not check for this hint at all.
1636  * The preprocessor define is left here for source compatibility.
1637  */
1638 #define SDL_HINT_VIDEO_X11_XVIDMODE "SDL_VIDEO_X11_XVIDMODE"
1639 
1640 /**
1641  * \brief Controls how the fact chunk affects the loading of a WAVE file.
1642  *
1643  * The fact chunk stores information about the number of samples of a WAVE
1644  * file. The Standards Update from Microsoft notes that this value can be used
1645  * to 'determine the length of the data in seconds'. This is especially useful
1646  * for compressed formats (for which this is a mandatory chunk) if they produce
1647  * multiple sample frames per block and truncating the block is not allowed.
1648  * The fact chunk can exactly specify how many sample frames there should be
1649  * in this case.
1650  *
1651  * Unfortunately, most application seem to ignore the fact chunk and so SDL
1652  * ignores it by default as well.
1653  *
1654  * This variable can be set to the following values:
1655  *
1656  * "truncate" - Use the number of samples to truncate the wave data if
1657  * the fact chunk is present and valid
1658  * "strict" - Like "truncate", but raise an error if the fact chunk
1659  * is invalid, not present for non-PCM formats, or if the
1660  * data chunk doesn't have that many samples
1661  * "ignorezero" - Like "truncate", but ignore fact chunk if the number of
1662  * samples is zero
1663  * "ignore" - Ignore fact chunk entirely (default)
1664  */
1665 #define SDL_HINT_WAVE_FACT_CHUNK "SDL_WAVE_FACT_CHUNK"
1666 
1667 /**
1668  * \brief Controls how the size of the RIFF chunk affects the loading of a WAVE file.
1669  *
1670  * The size of the RIFF chunk (which includes all the sub-chunks of the WAVE
1671  * file) is not always reliable. In case the size is wrong, it's possible to
1672  * just ignore it and step through the chunks until a fixed limit is reached.
1673  *
1674  * Note that files that have trailing data unrelated to the WAVE file or
1675  * corrupt files may slow down the loading process without a reliable boundary.
1676  * By default, SDL stops after 10000 chunks to prevent wasting time. Use the
1677  * environment variable SDL_WAVE_CHUNK_LIMIT to adjust this value.
1678  *
1679  * This variable can be set to the following values:
1680  *
1681  * "force" - Always use the RIFF chunk size as a boundary for the chunk search
1682  * "ignorezero" - Like "force", but a zero size searches up to 4 GiB (default)
1683  * "ignore" - Ignore the RIFF chunk size and always search up to 4 GiB
1684  * "maximum" - Search for chunks until the end of file (not recommended)
1685  */
1686 #define SDL_HINT_WAVE_RIFF_CHUNK_SIZE "SDL_WAVE_RIFF_CHUNK_SIZE"
1687 
1688 /**
1689  * \brief Controls how a truncated WAVE file is handled.
1690  *
1691  * A WAVE file is considered truncated if any of the chunks are incomplete or
1692  * the data chunk size is not a multiple of the block size. By default, SDL
1693  * decodes until the first incomplete block, as most applications seem to do.
1694  *
1695  * This variable can be set to the following values:
1696  *
1697  * "verystrict" - Raise an error if the file is truncated
1698  * "strict" - Like "verystrict", but the size of the RIFF chunk is ignored
1699  * "dropframe" - Decode until the first incomplete sample frame
1700  * "dropblock" - Decode until the first incomplete block (default)
1701  */
1702 #define SDL_HINT_WAVE_TRUNCATION "SDL_WAVE_TRUNCATION"
1703 
1704 /**
1705  * \brief Tell SDL not to name threads on Windows with the 0x406D1388 Exception.
1706  * The 0x406D1388 Exception is a trick used to inform Visual Studio of a
1707  * thread's name, but it tends to cause problems with other debuggers,
1708  * and the .NET runtime. Note that SDL 2.0.6 and later will still use
1709  * the (safer) SetThreadDescription API, introduced in the Windows 10
1710  * Creators Update, if available.
1711  *
1712  * The variable can be set to the following values:
1713  * "0" - SDL will raise the 0x406D1388 Exception to name threads.
1714  * This is the default behavior of SDL <= 2.0.4.
1715  * "1" - SDL will not raise this exception, and threads will be unnamed. (default)
1716  * This is necessary with .NET languages or debuggers that aren't Visual Studio.
1717  */
1718 #define SDL_HINT_WINDOWS_DISABLE_THREAD_NAMING "SDL_WINDOWS_DISABLE_THREAD_NAMING"
1719 
1720 /**
1721  * \brief A variable controlling whether the windows message loop is processed by SDL
1722  *
1723  * This variable can be set to the following values:
1724  * "0" - The window message loop is not run
1725  * "1" - The window message loop is processed in SDL_PumpEvents()
1726  *
1727  * By default SDL will process the windows message loop
1728  */
1729 #define SDL_HINT_WINDOWS_ENABLE_MESSAGELOOP "SDL_WINDOWS_ENABLE_MESSAGELOOP"
1730 
1731 /**
1732  * \brief Force SDL to use Critical Sections for mutexes on Windows.
1733  * On Windows 7 and newer, Slim Reader/Writer Locks are available.
1734  * They offer better performance, allocate no kernel ressources and
1735  * use less memory. SDL will fall back to Critical Sections on older
1736  * OS versions or if forced to by this hint.
1737  *
1738  * This variable can be set to the following values:
1739  * "0" - Use SRW Locks when available. If not, fall back to Critical Sections. (default)
1740  * "1" - Force the use of Critical Sections in all cases.
1741  *
1742  */
1743 #define SDL_HINT_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS "SDL_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS"
1744 
1745 /**
1746  * \brief Force SDL to use Kernel Semaphores on Windows.
1747  * Kernel Semaphores are inter-process and require a context
1748  * switch on every interaction. On Windows 8 and newer, the
1749  * WaitOnAddress API is available. Using that and atomics to
1750  * implement semaphores increases performance.
1751  * SDL will fall back to Kernel Objects on older OS versions
1752  * or if forced to by this hint.
1753  *
1754  * This variable can be set to the following values:
1755  * "0" - Use Atomics and WaitOnAddress API when available. If not, fall back to Kernel Objects. (default)
1756  * "1" - Force the use of Kernel Objects in all cases.
1757  *
1758  */
1759 #define SDL_HINT_WINDOWS_FORCE_SEMAPHORE_KERNEL "SDL_WINDOWS_FORCE_SEMAPHORE_KERNEL"
1760 
1761 /**
1762  * \brief A variable to specify custom icon resource id from RC file on Windows platform
1763  */
1764 #define SDL_HINT_WINDOWS_INTRESOURCE_ICON "SDL_WINDOWS_INTRESOURCE_ICON"
1765 #define SDL_HINT_WINDOWS_INTRESOURCE_ICON_SMALL "SDL_WINDOWS_INTRESOURCE_ICON_SMALL"
1766 
1767 /**
1768  * \brief Tell SDL not to generate window-close events for Alt+F4 on Windows.
1769  *
1770  * The variable can be set to the following values:
1771  * "0" - SDL will generate a window-close event when it sees Alt+F4.
1772  * "1" - SDL will only do normal key handling for Alt+F4.
1773  */
1774 #define SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4 "SDL_WINDOWS_NO_CLOSE_ON_ALT_F4"
1775 
1776 /**
1777  * \brief Use the D3D9Ex API introduced in Windows Vista, instead of normal D3D9.
1778  * Direct3D 9Ex contains changes to state management that can eliminate device
1779  * loss errors during scenarios like Alt+Tab or UAC prompts. D3D9Ex may require
1780  * some changes to your application to cope with the new behavior, so this
1781  * is disabled by default.
1782  *
1783  * This hint must be set before initializing the video subsystem.
1784  *
1785  * For more information on Direct3D 9Ex, see:
1786  * - https://docs.microsoft.com/en-us/windows/win32/direct3darticles/graphics-apis-in-windows-vista#direct3d-9ex
1787  * - https://docs.microsoft.com/en-us/windows/win32/direct3darticles/direct3d-9ex-improvements
1788  *
1789  * This variable can be set to the following values:
1790  * "0" - Use the original Direct3D 9 API (default)
1791  * "1" - Use the Direct3D 9Ex API on Vista and later (and fall back if D3D9Ex is unavailable)
1792  *
1793  */
1794 #define SDL_HINT_WINDOWS_USE_D3D9EX "SDL_WINDOWS_USE_D3D9EX"
1795 
1796 /**
1797  * \brief A variable controlling whether the window frame and title bar are interactive when the cursor is hidden
1798  *
1799  * This variable can be set to the following values:
1800  * "0" - The window frame is not interactive when the cursor is hidden (no move, resize, etc)
1801  * "1" - The window frame is interactive when the cursor is hidden
1802  *
1803  * By default SDL will allow interaction with the window frame when the cursor is hidden
1804  */
1805 #define SDL_HINT_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN "SDL_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN"
1806 
1807 /**
1808 * \brief A variable controlling whether the window is activated when the SDL_ShowWindow function is called
1809 *
1810 * This variable can be set to the following values:
1811 * "0" - The window is activated when the SDL_ShowWindow function is called
1812 * "1" - The window is not activated when the SDL_ShowWindow function is called
1813 *
1814 * By default SDL will activate the window when the SDL_ShowWindow function is called
1815 */
1816 #define SDL_HINT_WINDOW_NO_ACTIVATION_WHEN_SHOWN "SDL_WINDOW_NO_ACTIVATION_WHEN_SHOWN"
1817 
1818 /** \brief Allows back-button-press events on Windows Phone to be marked as handled
1819  *
1820  * Windows Phone devices typically feature a Back button. When pressed,
1821  * the OS will emit back-button-press events, which apps are expected to
1822  * handle in an appropriate manner. If apps do not explicitly mark these
1823  * events as 'Handled', then the OS will invoke its default behavior for
1824  * unhandled back-button-press events, which on Windows Phone 8 and 8.1 is to
1825  * terminate the app (and attempt to switch to the previous app, or to the
1826  * device's home screen).
1827  *
1828  * Setting the SDL_HINT_WINRT_HANDLE_BACK_BUTTON hint to "1" will cause SDL
1829  * to mark back-button-press events as Handled, if and when one is sent to
1830  * the app.
1831  *
1832  * Internally, Windows Phone sends back button events as parameters to
1833  * special back-button-press callback functions. Apps that need to respond
1834  * to back-button-press events are expected to register one or more
1835  * callback functions for such, shortly after being launched (during the
1836  * app's initialization phase). After the back button is pressed, the OS
1837  * will invoke these callbacks. If the app's callback(s) do not explicitly
1838  * mark the event as handled by the time they return, or if the app never
1839  * registers one of these callback, the OS will consider the event
1840  * un-handled, and it will apply its default back button behavior (terminate
1841  * the app).
1842  *
1843  * SDL registers its own back-button-press callback with the Windows Phone
1844  * OS. This callback will emit a pair of SDL key-press events (SDL_KEYDOWN
1845  * and SDL_KEYUP), each with a scancode of SDL_SCANCODE_AC_BACK, after which
1846  * it will check the contents of the hint, SDL_HINT_WINRT_HANDLE_BACK_BUTTON.
1847  * If the hint's value is set to "1", the back button event's Handled
1848  * property will get set to 'true'. If the hint's value is set to something
1849  * else, or if it is unset, SDL will leave the event's Handled property
1850  * alone. (By default, the OS sets this property to 'false', to note.)
1851  *
1852  * SDL apps can either set SDL_HINT_WINRT_HANDLE_BACK_BUTTON well before a
1853  * back button is pressed, or can set it in direct-response to a back button
1854  * being pressed.
1855  *
1856  * In order to get notified when a back button is pressed, SDL apps should
1857  * register a callback function with SDL_AddEventWatch(), and have it listen
1858  * for SDL_KEYDOWN events that have a scancode of SDL_SCANCODE_AC_BACK.
1859  * (Alternatively, SDL_KEYUP events can be listened-for. Listening for
1860  * either event type is suitable.) Any value of SDL_HINT_WINRT_HANDLE_BACK_BUTTON
1861  * set by such a callback, will be applied to the OS' current
1862  * back-button-press event.
1863  *
1864  * More details on back button behavior in Windows Phone apps can be found
1865  * at the following page, on Microsoft's developer site:
1866  * http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj247550(v=vs.105).aspx
1867  */
1868 #define SDL_HINT_WINRT_HANDLE_BACK_BUTTON "SDL_WINRT_HANDLE_BACK_BUTTON"
1869 
1870 /** \brief Label text for a WinRT app's privacy policy link
1871  *
1872  * Network-enabled WinRT apps must include a privacy policy. On Windows 8, 8.1, and RT,
1873  * Microsoft mandates that this policy be available via the Windows Settings charm.
1874  * SDL provides code to add a link there, with its label text being set via the
1875  * optional hint, SDL_HINT_WINRT_PRIVACY_POLICY_LABEL.
1876  *
1877  * Please note that a privacy policy's contents are not set via this hint. A separate
1878  * hint, SDL_HINT_WINRT_PRIVACY_POLICY_URL, is used to link to the actual text of the
1879  * policy.
1880  *
1881  * The contents of this hint should be encoded as a UTF8 string.
1882  *
1883  * The default value is "Privacy Policy". This hint should only be set during app
1884  * initialization, preferably before any calls to SDL_Init().
1885  *
1886  * For additional information on linking to a privacy policy, see the documentation for
1887  * SDL_HINT_WINRT_PRIVACY_POLICY_URL.
1888  */
1889 #define SDL_HINT_WINRT_PRIVACY_POLICY_LABEL "SDL_WINRT_PRIVACY_POLICY_LABEL"
1890 
1891 /**
1892  * \brief A URL to a WinRT app's privacy policy
1893  *
1894  * All network-enabled WinRT apps must make a privacy policy available to its
1895  * users. On Windows 8, 8.1, and RT, Microsoft mandates that this policy be
1896  * be available in the Windows Settings charm, as accessed from within the app.
1897  * SDL provides code to add a URL-based link there, which can point to the app's
1898  * privacy policy.
1899  *
1900  * To setup a URL to an app's privacy policy, set SDL_HINT_WINRT_PRIVACY_POLICY_URL
1901  * before calling any SDL_Init() functions. The contents of the hint should
1902  * be a valid URL. For example, "http://www.example.com".
1903  *
1904  * The default value is "", which will prevent SDL from adding a privacy policy
1905  * link to the Settings charm. This hint should only be set during app init.
1906  *
1907  * The label text of an app's "Privacy Policy" link may be customized via another
1908  * hint, SDL_HINT_WINRT_PRIVACY_POLICY_LABEL.
1909  *
1910  * Please note that on Windows Phone, Microsoft does not provide standard UI
1911  * for displaying a privacy policy link, and as such, SDL_HINT_WINRT_PRIVACY_POLICY_URL
1912  * will not get used on that platform. Network-enabled phone apps should display
1913  * their privacy policy through some other, in-app means.
1914  */
1915 #define SDL_HINT_WINRT_PRIVACY_POLICY_URL "SDL_WINRT_PRIVACY_POLICY_URL"
1916 
1917 /**
1918  * \brief Mark X11 windows as override-redirect.
1919  *
1920  * If set, this _might_ increase framerate at the expense of the desktop
1921  * not working as expected. Override-redirect windows aren't noticed by the
1922  * window manager at all.
1923  *
1924  * You should probably only use this for fullscreen windows, and you probably
1925  * shouldn't even use it for that. But it's here if you want to try!
1926  */
1927 #define SDL_HINT_X11_FORCE_OVERRIDE_REDIRECT "SDL_X11_FORCE_OVERRIDE_REDIRECT"
1928 
1929 /**
1930  * \brief A variable that lets you disable the detection and use of Xinput gamepad devices
1931  *
1932  * The variable can be set to the following values:
1933  * "0" - Disable XInput detection (only uses direct input)
1934  * "1" - Enable XInput detection (the default)
1935  */
1936 #define SDL_HINT_XINPUT_ENABLED "SDL_XINPUT_ENABLED"
1937 
1938 /**
1939  * \brief A variable that causes SDL to use the old axis and button mapping for XInput devices.
1940  *
1941  * This hint is for backwards compatibility only and will be removed in SDL 2.1
1942  *
1943  * The default value is "0". This hint must be set before SDL_Init()
1944  */
1945 #define SDL_HINT_XINPUT_USE_OLD_JOYSTICK_MAPPING "SDL_XINPUT_USE_OLD_JOYSTICK_MAPPING"
1946 
1947 /**
1948  * \brief A variable that causes SDL to not ignore audio "monitors"
1949  *
1950  * This is currently only used for PulseAudio and ignored elsewhere.
1951  *
1952  * By default, SDL ignores audio devices that aren't associated with physical
1953  * hardware. Changing this hint to "1" will expose anything SDL sees that
1954  * appears to be an audio source or sink. This will add "devices" to the list
1955  * that the user probably doesn't want or need, but it can be useful in
1956  * scenarios where you want to hook up SDL to some sort of virtual device,
1957  * etc.
1958  *
1959  * The default value is "0". This hint must be set before SDL_Init().
1960  *
1961  * This hint is available since SDL 2.0.16. Before then, virtual devices are
1962  * always ignored.
1963  */
1964 #define SDL_HINT_AUDIO_INCLUDE_MONITORS "SDL_AUDIO_INCLUDE_MONITORS"
1965 
1966 /**
1967  * \brief A variable that forces X11 windows to create as a custom type.
1968  *
1969  * This is currently only used for X11 and ignored elsewhere.
1970  *
1971  * During SDL_CreateWindow, SDL uses the _NET_WM_WINDOW_TYPE X11 property
1972  * to report to the window manager the type of window it wants to create.
1973  * This might be set to various things if SDL_WINDOW_TOOLTIP or
1974  * SDL_WINDOW_POPUP_MENU, etc, were specified. For "normal" windows that
1975  * haven't set a specific type, this hint can be used to specify a custom
1976  * type. For example, a dock window might set this to
1977  * "_NET_WM_WINDOW_TYPE_DOCK".
1978  *
1979  * If not set or set to "", this hint is ignored. This hint must be set
1980  * before the SDL_CreateWindow() call that it is intended to affect.
1981  *
1982  * This hint is available since SDL 2.0.22.
1983  */
1984 #define SDL_HINT_X11_WINDOW_TYPE "SDL_X11_WINDOW_TYPE"
1985 
1986 /**
1987  * \brief A variable that decides whether to send SDL_QUIT when closing the final window.
1988  *
1989  * By default, SDL sends an SDL_QUIT event when there is only one window
1990  * and it receives an SDL_WINDOWEVENT_CLOSE event, under the assumption most
1991  * apps would also take the loss of this window as a signal to terminate the
1992  * program.
1993  *
1994  * However, it's not unreasonable in some cases to have the program continue
1995  * to live on, perhaps to create new windows later.
1996  *
1997  * Changing this hint to "0" will cause SDL to not send an SDL_QUIT event
1998  * when the final window is requesting to close. Note that in this case,
1999  * there are still other legitimate reasons one might get an SDL_QUIT
2000  * event: choosing "Quit" from the macOS menu bar, sending a SIGINT (ctrl-c)
2001  * on Unix, etc.
2002  *
2003  * The default value is "1". This hint can be changed at any time.
2004  *
2005  * This hint is available since SDL 2.0.22. Before then, you always get
2006  * an SDL_QUIT event when closing the final window.
2007  */
2008 #define SDL_HINT_QUIT_ON_LAST_WINDOW_CLOSE "SDL_QUIT_ON_LAST_WINDOW_CLOSE"
2009 
2010 
2011 /**
2012  * \brief A variable that decides what video backend to use.
2013  *
2014  * By default, SDL will try all available video backends in a reasonable
2015  * order until it finds one that can work, but this hint allows the app
2016  * or user to force a specific target, such as "x11" if, say, you are
2017  * on Wayland but want to try talking to the X server instead.
2018  *
2019  * This functionality has existed since SDL 2.0.0 (indeed, before that)
2020  * but before 2.0.22 this was an environment variable only. In 2.0.22,
2021  * it was upgraded to a full SDL hint, so you can set the environment
2022  * variable as usual or programatically set the hint with SDL_SetHint,
2023  * which won't propagate to child processes.
2024  *
2025  * The default value is unset, in which case SDL will try to figure out
2026  * the best video backend on your behalf. This hint needs to be set
2027  * before SDL_Init() is called to be useful.
2028  *
2029  * This hint is available since SDL 2.0.22. Before then, you could set
2030  * the environment variable to get the same effect.
2031  */
2032 #define SDL_HINT_VIDEODRIVER "SDL_VIDEODRIVER"
2033 
2034 /**
2035  * \brief A variable that decides what audio backend to use.
2036  *
2037  * By default, SDL will try all available audio backends in a reasonable
2038  * order until it finds one that can work, but this hint allows the app
2039  * or user to force a specific target, such as "alsa" if, say, you are
2040  * on PulseAudio but want to try talking to the lower level instead.
2041  *
2042  * This functionality has existed since SDL 2.0.0 (indeed, before that)
2043  * but before 2.0.22 this was an environment variable only. In 2.0.22,
2044  * it was upgraded to a full SDL hint, so you can set the environment
2045  * variable as usual or programatically set the hint with SDL_SetHint,
2046  * which won't propagate to child processes.
2047  *
2048  * The default value is unset, in which case SDL will try to figure out
2049  * the best audio backend on your behalf. This hint needs to be set
2050  * before SDL_Init() is called to be useful.
2051  *
2052  * This hint is available since SDL 2.0.22. Before then, you could set
2053  * the environment variable to get the same effect.
2054  */
2055 #define SDL_HINT_AUDIODRIVER "SDL_AUDIODRIVER"
2056 
2057 
2058 /**
2059  * \brief An enumeration of hint priorities
2060  */
2061 typedef enum
2062 {
2067 
2068 
2069 /**
2070  * Set a hint with a specific priority.
2071  *
2072  * The priority controls the behavior when setting a hint that already has a
2073  * value. Hints will replace existing hints of their priority and lower.
2074  * Environment variables are considered to have override priority.
2075  *
2076  * \param name the hint to set
2077  * \param value the value of the hint variable
2078  * \param priority the SDL_HintPriority level for the hint
2079  * \returns SDL_TRUE if the hint was set, SDL_FALSE otherwise.
2080  *
2081  * \since This function is available since SDL 2.0.0.
2082  *
2083  * \sa SDL_GetHint
2084  * \sa SDL_SetHint
2085  */
2086 extern DECLSPEC SDL_bool SDLCALL SDL_SetHintWithPriority(const char *name,
2087  const char *value,
2088  SDL_HintPriority priority);
2089 
2090 /**
2091  * Set a hint with normal priority.
2092  *
2093  * Hints will not be set if there is an existing override hint or environment
2094  * variable that takes precedence. You can use SDL_SetHintWithPriority() to
2095  * set the hint with override priority instead.
2096  *
2097  * \param name the hint to set
2098  * \param value the value of the hint variable
2099  * \returns SDL_TRUE if the hint was set, SDL_FALSE otherwise.
2100  *
2101  * \since This function is available since SDL 2.0.0.
2102  *
2103  * \sa SDL_GetHint
2104  * \sa SDL_SetHintWithPriority
2105  */
2106 extern DECLSPEC SDL_bool SDLCALL SDL_SetHint(const char *name,
2107  const char *value);
2108 
2109 /**
2110  * Get the value of a hint.
2111  *
2112  * \param name the hint to query
2113  * \returns the string value of a hint or NULL if the hint isn't set.
2114  *
2115  * \since This function is available since SDL 2.0.0.
2116  *
2117  * \sa SDL_SetHint
2118  * \sa SDL_SetHintWithPriority
2119  */
2120 extern DECLSPEC const char * SDLCALL SDL_GetHint(const char *name);
2121 
2122 /**
2123  * Get the boolean value of a hint variable.
2124  *
2125  * \param name the name of the hint to get the boolean value from
2126  * \param default_value the value to return if the hint does not exist
2127  * \returns the boolean value of a hint or the provided default value if the
2128  * hint does not exist.
2129  *
2130  * \since This function is available since SDL 2.0.5.
2131  *
2132  * \sa SDL_GetHint
2133  * \sa SDL_SetHint
2134  */
2135 extern DECLSPEC SDL_bool SDLCALL SDL_GetHintBoolean(const char *name, SDL_bool default_value);
2136 
2137 /**
2138  * Type definition of the hint callback function.
2139  *
2140  * \param userdata what was passed as `userdata` to SDL_AddHintCallback()
2141  * \param name what was passed as `name` to SDL_AddHintCallback()
2142  * \param oldValue the previous hint value
2143  * \param newValue the new value hint is to be set to
2144  */
2145 typedef void (SDLCALL *SDL_HintCallback)(void *userdata, const char *name, const char *oldValue, const char *newValue);
2146 
2147 /**
2148  * Add a function to watch a particular hint.
2149  *
2150  * \param name the hint to watch
2151  * \param callback An SDL_HintCallback function that will be called when the
2152  * hint value changes
2153  * \param userdata a pointer to pass to the callback function
2154  *
2155  * \since This function is available since SDL 2.0.0.
2156  *
2157  * \sa SDL_DelHintCallback
2158  */
2159 extern DECLSPEC void SDLCALL SDL_AddHintCallback(const char *name,
2160  SDL_HintCallback callback,
2161  void *userdata);
2162 
2163 /**
2164  * Remove a function watching a particular hint.
2165  *
2166  * \param name the hint being watched
2167  * \param callback An SDL_HintCallback function that will be called when the
2168  * hint value changes
2169  * \param userdata a pointer being passed to the callback function
2170  *
2171  * \since This function is available since SDL 2.0.0.
2172  *
2173  * \sa SDL_AddHintCallback
2174  */
2175 extern DECLSPEC void SDLCALL SDL_DelHintCallback(const char *name,
2176  SDL_HintCallback callback,
2177  void *userdata);
2178 
2179 /**
2180  * Clear all hints.
2181  *
2182  * This function is automatically called during SDL_Quit().
2183  *
2184  * \since This function is available since SDL 2.0.0.
2185  */
2186 extern DECLSPEC void SDLCALL SDL_ClearHints(void);
2187 
2188 
2189 /* Ends C function definitions when using C++ */
2190 #ifdef __cplusplus
2191 }
2192 #endif
2193 #include "close_code.h"
2194 
2195 #endif /* SDL_hints_h_ */
2196 
2197 /* vi: set ts=4 sw=4 expandtab: */
SDL_bool SDL_GetHintBoolean(const char *name, SDL_bool default_value)
void(* SDL_HintCallback)(void *userdata, const char *name, const char *oldValue, const char *newValue)
Definition: SDL_hints.h:2145
void SDL_DelHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
void SDL_ClearHints(void)
SDL_bool SDL_SetHintWithPriority(const char *name, const char *value, SDL_HintPriority priority)
SDL_bool SDL_SetHint(const char *name, const char *value)
SDL_HintPriority
An enumeration of hint priorities.
Definition: SDL_hints.h:2062
@ SDL_HINT_DEFAULT
Definition: SDL_hints.h:2063
@ SDL_HINT_OVERRIDE
Definition: SDL_hints.h:2065
@ SDL_HINT_NORMAL
Definition: SDL_hints.h:2064
const char * SDL_GetHint(const char *name)
void SDL_AddHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
SDL_bool
Definition: SDL_stdinc.h:179