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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/**
+ * # CategoryInit
+ *
+ * All SDL programs need to initialize the library before starting to work
+ * with it.
+ *
+ * Almost everything can simply call SDL_Init() near startup, with a handful
+ * of flags to specify subsystems to touch. These are here to make sure SDL
+ * does not even attempt to touch low-level pieces of the operating system
+ * that you don't intend to use. For example, you might be using SDL for video
+ * and input but chose an external library for audio, and in this case you
+ * would just need to leave off the `SDL_INIT_AUDIO` flag to make sure that
+ * external library has complete control.
+ *
+ * Most apps, when terminating, should call SDL_Quit(). This will clean up
+ * (nearly) everything that SDL might have allocated, and crucially, it'll
+ * make sure that the display's resolution is back to what the user expects if
+ * you had previously changed it for your game.
+ *
+ * SDL3 apps are strongly encouraged to call SDL_SetAppMetadata() at startup
+ * to fill in details about the program. This is completely optional, but it
+ * helps in small ways (we can provide an About dialog box for the macOS menu,
+ * we can name the app in the system's audio mixer, etc). Those that want to
+ * provide a _lot_ of information should look at the more-detailed
+ * SDL_SetAppMetadataProperty().
+ */
+
+#ifndef SDL_init_h_
+#define SDL_init_h_
+
+#include <SDL3/SDL_stdinc.h>
+#include <SDL3/SDL_error.h>
+#include <SDL3/SDL_events.h>
+
+#include <SDL3/SDL_begin_code.h>
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* As of version 0.5, SDL is loaded dynamically into the application */
+
+/**
+ * Initialization flags for SDL_Init and/or SDL_InitSubSystem
+ *
+ * These are the flags which may be passed to SDL_Init(). You should specify
+ * the subsystems which you will be using in your application.
+ *
+ * \since This datatype is available since SDL 3.2.0.
+ *
+ * \sa SDL_Init
+ * \sa SDL_Quit
+ * \sa SDL_InitSubSystem
+ * \sa SDL_QuitSubSystem
+ * \sa SDL_WasInit
+ */
+typedef Uint32 SDL_InitFlags;
+
+#define SDL_INIT_AUDIO      0x00000010u /**< `SDL_INIT_AUDIO` implies `SDL_INIT_EVENTS` */
+#define SDL_INIT_VIDEO      0x00000020u /**< `SDL_INIT_VIDEO` implies `SDL_INIT_EVENTS`, should be initialized on the main thread */
+#define SDL_INIT_JOYSTICK   0x00000200u /**< `SDL_INIT_JOYSTICK` implies `SDL_INIT_EVENTS`, should be initialized on the same thread as SDL_INIT_VIDEO on Windows if you don't set SDL_HINT_JOYSTICK_THREAD */
+#define SDL_INIT_HAPTIC     0x00001000u
+#define SDL_INIT_GAMEPAD    0x00002000u /**< `SDL_INIT_GAMEPAD` implies `SDL_INIT_JOYSTICK` */
+#define SDL_INIT_EVENTS     0x00004000u
+#define SDL_INIT_SENSOR     0x00008000u /**< `SDL_INIT_SENSOR` implies `SDL_INIT_EVENTS` */
+#define SDL_INIT_CAMERA     0x00010000u /**< `SDL_INIT_CAMERA` implies `SDL_INIT_EVENTS` */
+
+/**
+ * Return values for optional main callbacks.
+ *
+ * Returning SDL_APP_SUCCESS or SDL_APP_FAILURE from SDL_AppInit,
+ * SDL_AppEvent, or SDL_AppIterate will terminate the program and report
+ * success/failure to the operating system. What that means is
+ * platform-dependent. On Unix, for example, on success, the process error
+ * code will be zero, and on failure it will be 1. This interface doesn't
+ * allow you to return specific exit codes, just whether there was an error
+ * generally or not.
+ *
+ * Returning SDL_APP_CONTINUE from these functions will let the app continue
+ * to run.
+ *
+ * See
+ * [Main callbacks in SDL3](https://wiki.libsdl.org/SDL3/README/main-functions#main-callbacks-in-sdl3)
+ * for complete details.
+ *
+ * \since This enum is available since SDL 3.2.0.
+ */
+typedef enum SDL_AppResult
+{
+    SDL_APP_CONTINUE,   /**< Value that requests that the app continue from the main callbacks. */
+    SDL_APP_SUCCESS,    /**< Value that requests termination with success from the main callbacks. */
+    SDL_APP_FAILURE     /**< Value that requests termination with error from the main callbacks. */
+} SDL_AppResult;
+
+/**
+ * Function pointer typedef for SDL_AppInit.
+ *
+ * These are used by SDL_EnterAppMainCallbacks. This mechanism operates behind
+ * the scenes for apps using the optional main callbacks. Apps that want to
+ * use this should just implement SDL_AppInit directly.
+ *
+ * \param appstate a place where the app can optionally store a pointer for
+ *                 future use.
+ * \param argc the standard ANSI C main's argc; number of elements in `argv`.
+ * \param argv the standard ANSI C main's argv; array of command line
+ *             arguments.
+ * \returns SDL_APP_FAILURE to terminate with an error, SDL_APP_SUCCESS to
+ *          terminate with success, SDL_APP_CONTINUE to continue.
+ *
+ * \since This datatype is available since SDL 3.2.0.
+ */
+typedef SDL_AppResult (SDLCALL *SDL_AppInit_func)(void **appstate, int argc, char *argv[]);
+
+/**
+ * Function pointer typedef for SDL_AppIterate.
+ *
+ * These are used by SDL_EnterAppMainCallbacks. This mechanism operates behind
+ * the scenes for apps using the optional main callbacks. Apps that want to
+ * use this should just implement SDL_AppIterate directly.
+ *
+ * \param appstate an optional pointer, provided by the app in SDL_AppInit.
+ * \returns SDL_APP_FAILURE to terminate with an error, SDL_APP_SUCCESS to
+ *          terminate with success, SDL_APP_CONTINUE to continue.
+ *
+ * \since This datatype is available since SDL 3.2.0.
+ */
+typedef SDL_AppResult (SDLCALL *SDL_AppIterate_func)(void *appstate);
+
+/**
+ * Function pointer typedef for SDL_AppEvent.
+ *
+ * These are used by SDL_EnterAppMainCallbacks. This mechanism operates behind
+ * the scenes for apps using the optional main callbacks. Apps that want to
+ * use this should just implement SDL_AppEvent directly.
+ *
+ * \param appstate an optional pointer, provided by the app in SDL_AppInit.
+ * \param event the new event for the app to examine.
+ * \returns SDL_APP_FAILURE to terminate with an error, SDL_APP_SUCCESS to
+ *          terminate with success, SDL_APP_CONTINUE to continue.
+ *
+ * \since This datatype is available since SDL 3.2.0.
+ */
+typedef SDL_AppResult (SDLCALL *SDL_AppEvent_func)(void *appstate, SDL_Event *event);
+
+/**
+ * Function pointer typedef for SDL_AppQuit.
+ *
+ * These are used by SDL_EnterAppMainCallbacks. This mechanism operates behind
+ * the scenes for apps using the optional main callbacks. Apps that want to
+ * use this should just implement SDL_AppEvent directly.
+ *
+ * \param appstate an optional pointer, provided by the app in SDL_AppInit.
+ * \param result the result code that terminated the app (success or failure).
+ *
+ * \since This datatype is available since SDL 3.2.0.
+ */
+typedef void (SDLCALL *SDL_AppQuit_func)(void *appstate, SDL_AppResult result);
+
+
+/**
+ * Initialize the SDL library.
+ *
+ * SDL_Init() simply forwards to calling SDL_InitSubSystem(). Therefore, the
+ * two may be used interchangeably. Though for readability of your code
+ * SDL_InitSubSystem() might be preferred.
+ *
+ * The file I/O (for example: SDL_IOFromFile) and threading (SDL_CreateThread)
+ * subsystems are initialized by default. Message boxes
+ * (SDL_ShowSimpleMessageBox) also attempt to work without initializing the
+ * video subsystem, in hopes of being useful in showing an error dialog when
+ * SDL_Init fails. You must specifically initialize other subsystems if you
+ * use them in your application.
+ *
+ * Logging (such as SDL_Log) works without initialization, too.
+ *
+ * `flags` may be any of the following OR'd together:
+ *
+ * - `SDL_INIT_AUDIO`: audio subsystem; automatically initializes the events
+ *   subsystem
+ * - `SDL_INIT_VIDEO`: video subsystem; automatically initializes the events
+ *   subsystem, should be initialized on the main thread.
+ * - `SDL_INIT_JOYSTICK`: joystick subsystem; automatically initializes the
+ *   events subsystem
+ * - `SDL_INIT_HAPTIC`: haptic (force feedback) subsystem
+ * - `SDL_INIT_GAMEPAD`: gamepad subsystem; automatically initializes the
+ *   joystick subsystem
+ * - `SDL_INIT_EVENTS`: events subsystem
+ * - `SDL_INIT_SENSOR`: sensor subsystem; automatically initializes the events
+ *   subsystem
+ * - `SDL_INIT_CAMERA`: camera subsystem; automatically initializes the events
+ *   subsystem
+ *
+ * Subsystem initialization is ref-counted, you must call SDL_QuitSubSystem()
+ * for each SDL_InitSubSystem() to correctly shutdown a subsystem manually (or
+ * call SDL_Quit() to force shutdown). If a subsystem is already loaded then
+ * this call will increase the ref-count and return.
+ *
+ * Consider reporting some basic metadata about your application before
+ * calling SDL_Init, using either SDL_SetAppMetadata() or
+ * SDL_SetAppMetadataProperty().
+ *
+ * \param flags subsystem initialization flags.
+ * \returns true on success or false on failure; call SDL_GetError() for more
+ *          information.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_SetAppMetadata
+ * \sa SDL_SetAppMetadataProperty
+ * \sa SDL_InitSubSystem
+ * \sa SDL_Quit
+ * \sa SDL_SetMainReady
+ * \sa SDL_WasInit
+ */
+extern SDL_DECLSPEC bool SDLCALL SDL_Init(SDL_InitFlags flags);
+
+/**
+ * Compatibility function to initialize the SDL library.
+ *
+ * This function and SDL_Init() are interchangeable.
+ *
+ * \param flags any of the flags used by SDL_Init(); see SDL_Init for details.
+ * \returns true on success or false on failure; call SDL_GetError() for more
+ *          information.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_Init
+ * \sa SDL_Quit
+ * \sa SDL_QuitSubSystem
+ */
+extern SDL_DECLSPEC bool SDLCALL SDL_InitSubSystem(SDL_InitFlags flags);
+
+/**
+ * Shut down specific SDL subsystems.
+ *
+ * You still need to call SDL_Quit() even if you close all open subsystems
+ * with SDL_QuitSubSystem().
+ *
+ * \param flags any of the flags used by SDL_Init(); see SDL_Init for details.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_InitSubSystem
+ * \sa SDL_Quit
+ */
+extern SDL_DECLSPEC void SDLCALL SDL_QuitSubSystem(SDL_InitFlags flags);
+
+/**
+ * Get a mask of the specified subsystems which are currently initialized.
+ *
+ * \param flags any of the flags used by SDL_Init(); see SDL_Init for details.
+ * \returns a mask of all initialized subsystems if `flags` is 0, otherwise it
+ *          returns the initialization status of the specified subsystems.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_Init
+ * \sa SDL_InitSubSystem
+ */
+extern SDL_DECLSPEC SDL_InitFlags SDLCALL SDL_WasInit(SDL_InitFlags flags);
+
+/**
+ * Clean up all initialized subsystems.
+ *
+ * You should call this function even if you have already shutdown each
+ * initialized subsystem with SDL_QuitSubSystem(). It is safe to call this
+ * function even in the case of errors in initialization.
+ *
+ * You can use this function with atexit() to ensure that it is run when your
+ * application is shutdown, but it is not wise to do this from a library or
+ * other dynamically loaded code.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_Init
+ * \sa SDL_QuitSubSystem
+ */
+extern SDL_DECLSPEC void SDLCALL SDL_Quit(void);
+
+/**
+ * Return whether this is the main thread.
+ *
+ * On Apple platforms, the main thread is the thread that runs your program's
+ * main() entry point. On other platforms, the main thread is the one that
+ * calls SDL_Init(SDL_INIT_VIDEO), which should usually be the one that runs
+ * your program's main() entry point. If you are using the main callbacks,
+ * SDL_AppInit(), SDL_AppIterate(), and SDL_AppQuit() are all called on the
+ * main thread.
+ *
+ * \returns true if this thread is the main thread, or false otherwise.
+ *
+ * \threadsafety It is safe to call this function from any thread.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_RunOnMainThread
+ */
+extern SDL_DECLSPEC bool SDLCALL SDL_IsMainThread(void);
+
+/**
+ * Callback run on the main thread.
+ *
+ * \param userdata an app-controlled pointer that is passed to the callback.
+ *
+ * \since This datatype is available since SDL 3.2.0.
+ *
+ * \sa SDL_RunOnMainThread
+ */
+typedef void (SDLCALL *SDL_MainThreadCallback)(void *userdata);
+
+/**
+ * Call a function on the main thread during event processing.
+ *
+ * If this is called on the main thread, the callback is executed immediately.
+ * If this is called on another thread, this callback is queued for execution
+ * on the main thread during event processing.
+ *
+ * Be careful of deadlocks when using this functionality. You should not have
+ * the main thread wait for the current thread while this function is being
+ * called with `wait_complete` true.
+ *
+ * \param callback the callback to call on the main thread.
+ * \param userdata a pointer that is passed to `callback`.
+ * \param wait_complete true to wait for the callback to complete, false to
+ *                      return immediately.
+ * \returns true on success or false on failure; call SDL_GetError() for more
+ *          information.
+ *
+ * \threadsafety It is safe to call this function from any thread.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_IsMainThread
+ */
+extern SDL_DECLSPEC bool SDLCALL SDL_RunOnMainThread(SDL_MainThreadCallback callback, void *userdata, bool wait_complete);
+
+/**
+ * Specify basic metadata about your app.
+ *
+ * You can optionally provide metadata about your app to SDL. This is not
+ * required, but strongly encouraged.
+ *
+ * There are several locations where SDL can make use of metadata (an "About"
+ * box in the macOS menu bar, the name of the app can be shown on some audio
+ * mixers, etc). Any piece of metadata can be left as NULL, if a specific
+ * detail doesn't make sense for the app.
+ *
+ * This function should be called as early as possible, before SDL_Init.
+ * Multiple calls to this function are allowed, but various state might not
+ * change once it has been set up with a previous call to this function.
+ *
+ * Passing a NULL removes any previous metadata.
+ *
+ * This is a simplified interface for the most important information. You can
+ * supply significantly more detailed metadata with
+ * SDL_SetAppMetadataProperty().
+ *
+ * \param appname The name of the application ("My Game 2: Bad Guy's
+ *                Revenge!").
+ * \param appversion The version of the application ("1.0.0beta5" or a git
+ *                   hash, or whatever makes sense).
+ * \param appidentifier A unique string in reverse-domain format that
+ *                      identifies this app ("com.example.mygame2").
+ * \returns true on success or false on failure; call SDL_GetError() for more
+ *          information.
+ *
+ * \threadsafety It is safe to call this function from any thread.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_SetAppMetadataProperty
+ */
+extern SDL_DECLSPEC bool SDLCALL SDL_SetAppMetadata(const char *appname, const char *appversion, const char *appidentifier);
+
+/**
+ * Specify metadata about your app through a set of properties.
+ *
+ * You can optionally provide metadata about your app to SDL. This is not
+ * required, but strongly encouraged.
+ *
+ * There are several locations where SDL can make use of metadata (an "About"
+ * box in the macOS menu bar, the name of the app can be shown on some audio
+ * mixers, etc). Any piece of metadata can be left out, if a specific detail
+ * doesn't make sense for the app.
+ *
+ * This function should be called as early as possible, before SDL_Init.
+ * Multiple calls to this function are allowed, but various state might not
+ * change once it has been set up with a previous call to this function.
+ *
+ * Once set, this metadata can be read using SDL_GetAppMetadataProperty().
+ *
+ * These are the supported properties:
+ *
+ * - `SDL_PROP_APP_METADATA_NAME_STRING`: The human-readable name of the
+ *   application, like "My Game 2: Bad Guy's Revenge!". This will show up
+ *   anywhere the OS shows the name of the application separately from window
+ *   titles, such as volume control applets, etc. This defaults to "SDL
+ *   Application".
+ * - `SDL_PROP_APP_METADATA_VERSION_STRING`: The version of the app that is
+ *   running; there are no rules on format, so "1.0.3beta2" and "April 22nd,
+ *   2024" and a git hash are all valid options. This has no default.
+ * - `SDL_PROP_APP_METADATA_IDENTIFIER_STRING`: A unique string that
+ *   identifies this app. This must be in reverse-domain format, like
+ *   "com.example.mygame2". This string is used by desktop compositors to
+ *   identify and group windows together, as well as match applications with
+ *   associated desktop settings and icons. If you plan to package your
+ *   application in a container such as Flatpak, the app ID should match the
+ *   name of your Flatpak container as well. This has no default.
+ * - `SDL_PROP_APP_METADATA_CREATOR_STRING`: The human-readable name of the
+ *   creator/developer/maker of this app, like "MojoWorkshop, LLC"
+ * - `SDL_PROP_APP_METADATA_COPYRIGHT_STRING`: The human-readable copyright
+ *   notice, like "Copyright (c) 2024 MojoWorkshop, LLC" or whatnot. Keep this
+ *   to one line, don't paste a copy of a whole software license in here. This
+ *   has no default.
+ * - `SDL_PROP_APP_METADATA_URL_STRING`: A URL to the app on the web. Maybe a
+ *   product page, or a storefront, or even a GitHub repository, for user's
+ *   further information This has no default.
+ * - `SDL_PROP_APP_METADATA_TYPE_STRING`: The type of application this is.
+ *   Currently this string can be "game" for a video game, "mediaplayer" for a
+ *   media player, or generically "application" if nothing else applies.
+ *   Future versions of SDL might add new types. This defaults to
+ *   "application".
+ *
+ * \param name the name of the metadata property to set.
+ * \param value the value of the property, or NULL to remove that property.
+ * \returns true on success or false on failure; call SDL_GetError() for more
+ *          information.
+ *
+ * \threadsafety It is safe to call this function from any thread.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_GetAppMetadataProperty
+ * \sa SDL_SetAppMetadata
+ */
+extern SDL_DECLSPEC bool SDLCALL SDL_SetAppMetadataProperty(const char *name, const char *value);
+
+#define SDL_PROP_APP_METADATA_NAME_STRING         "SDL.app.metadata.name"
+#define SDL_PROP_APP_METADATA_VERSION_STRING      "SDL.app.metadata.version"
+#define SDL_PROP_APP_METADATA_IDENTIFIER_STRING   "SDL.app.metadata.identifier"
+#define SDL_PROP_APP_METADATA_CREATOR_STRING      "SDL.app.metadata.creator"
+#define SDL_PROP_APP_METADATA_COPYRIGHT_STRING    "SDL.app.metadata.copyright"
+#define SDL_PROP_APP_METADATA_URL_STRING          "SDL.app.metadata.url"
+#define SDL_PROP_APP_METADATA_TYPE_STRING         "SDL.app.metadata.type"
+
+/**
+ * Get metadata about your app.
+ *
+ * This returns metadata previously set using SDL_SetAppMetadata() or
+ * SDL_SetAppMetadataProperty(). See SDL_SetAppMetadataProperty() for the list
+ * of available properties and their meanings.
+ *
+ * \param name the name of the metadata property to get.
+ * \returns the current value of the metadata property, or the default if it
+ *          is not set, NULL for properties with no default.
+ *
+ * \threadsafety It is safe to call this function from any thread, although
+ *               the string returned is not protected and could potentially be
+ *               freed if you call SDL_SetAppMetadataProperty() to set that
+ *               property from another thread.
+ *
+ * \since This function is available since SDL 3.2.0.
+ *
+ * \sa SDL_SetAppMetadata
+ * \sa SDL_SetAppMetadataProperty
+ */
+extern SDL_DECLSPEC const char * SDLCALL SDL_GetAppMetadataProperty(const char *name);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include <SDL3/SDL_close_code.h>
+
+#endif /* SDL_init_h_ */