--- /dev/null
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2019 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.
+*/
+
+/**
+ * \file SDL_hints.h
+ *
+ * Official documentation for SDL configuration variables
+ *
+ * This file contains functions to set and get configuration hints,
+ * as well as listing each of them alphabetically.
+ *
+ * The convention for naming hints is SDL_HINT_X, where "SDL_X" is
+ * the environment variable that can be used to override the default.
+ *
+ * In general these hints are just that - they may or may not be
+ * supported or applicable on any given platform, but they provide
+ * a way for an application or user to give the library a hint as
+ * to how they would like the library to work.
+ */
+
+#ifndef SDL_hints_h_
+#define SDL_hints_h_
+
+#include "SDL_stdinc.h"
+
+#include "begin_code.h"
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief A variable controlling how 3D acceleration is used to accelerate the SDL screen surface.
+ *
+ * SDL can try to accelerate the SDL screen surface by using streaming
+ * textures with a 3D rendering engine. This variable controls whether and
+ * how this is done.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable 3D acceleration
+ * "1" - Enable 3D acceleration, using the default renderer.
+ * "X" - Enable 3D acceleration, using X where X is one of the valid rendering drivers. (e.g. "direct3d", "opengl", etc.)
+ *
+ * By default SDL tries to make a best guess for each platform whether
+ * to use acceleration or not.
+ */
+#define SDL_HINT_FRAMEBUFFER_ACCELERATION "SDL_FRAMEBUFFER_ACCELERATION"
+
+/**
+ * \brief A variable specifying which render driver to use.
+ *
+ * If the application doesn't pick a specific renderer to use, this variable
+ * specifies the name of the preferred renderer. If the preferred renderer
+ * can't be initialized, the normal default renderer is used.
+ *
+ * This variable is case insensitive and can be set to the following values:
+ * "direct3d"
+ * "opengl"
+ * "opengles2"
+ * "opengles"
+ * "metal"
+ * "software"
+ *
+ * The default varies by platform, but it's the first one in the list that
+ * is available on the current platform.
+ */
+#define SDL_HINT_RENDER_DRIVER "SDL_RENDER_DRIVER"
+
+/**
+ * \brief A variable controlling whether the OpenGL render driver uses shaders if they are available.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable shaders
+ * "1" - Enable shaders
+ *
+ * By default shaders are used if OpenGL supports them.
+ */
+#define SDL_HINT_RENDER_OPENGL_SHADERS "SDL_RENDER_OPENGL_SHADERS"
+
+/**
+ * \brief A variable controlling whether the Direct3D device is initialized for thread-safe operations.
+ *
+ * This variable can be set to the following values:
+ * "0" - Thread-safety is not enabled (faster)
+ * "1" - Thread-safety is enabled
+ *
+ * By default the Direct3D device is created with thread-safety disabled.
+ */
+#define SDL_HINT_RENDER_DIRECT3D_THREADSAFE "SDL_RENDER_DIRECT3D_THREADSAFE"
+
+/**
+ * \brief A variable controlling whether to enable Direct3D 11+'s Debug Layer.
+ *
+ * This variable does not have any effect on the Direct3D 9 based renderer.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable Debug Layer use
+ * "1" - Enable Debug Layer use
+ *
+ * By default, SDL does not use Direct3D Debug Layer.
+ */
+#define SDL_HINT_RENDER_DIRECT3D11_DEBUG "SDL_RENDER_DIRECT3D11_DEBUG"
+
+/**
+ * \brief A variable controlling the scaling policy for SDL_RenderSetLogicalSize.
+ *
+ * This variable can be set to the following values:
+ * "0" or "letterbox" - Uses letterbox/sidebars to fit the entire rendering on screen
+ * "1" or "overscan" - Will zoom the rendering so it fills the entire screen, allowing edges to be drawn offscreen
+ *
+ * By default letterbox is used
+ */
+#define SDL_HINT_RENDER_LOGICAL_SIZE_MODE "SDL_RENDER_LOGICAL_SIZE_MODE"
+
+/**
+ * \brief A variable controlling the scaling quality
+ *
+ * This variable can be set to the following values:
+ * "0" or "nearest" - Nearest pixel sampling
+ * "1" or "linear" - Linear filtering (supported by OpenGL and Direct3D)
+ * "2" or "best" - Currently this is the same as "linear"
+ *
+ * By default nearest pixel sampling is used
+ */
+#define SDL_HINT_RENDER_SCALE_QUALITY "SDL_RENDER_SCALE_QUALITY"
+
+/**
+ * \brief A variable controlling whether updates to the SDL screen surface should be synchronized with the vertical refresh, to avoid tearing.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable vsync
+ * "1" - Enable vsync
+ *
+ * By default SDL does not sync screen surface updates with vertical refresh.
+ */
+#define SDL_HINT_RENDER_VSYNC "SDL_RENDER_VSYNC"
+
+/**
+ * \brief A variable controlling whether the screensaver is enabled.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable screensaver
+ * "1" - Enable screensaver
+ *
+ * By default SDL will disable the screensaver.
+ */
+#define SDL_HINT_VIDEO_ALLOW_SCREENSAVER "SDL_VIDEO_ALLOW_SCREENSAVER"
+
+/**
+ * \brief A variable controlling whether the X11 VidMode extension should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable XVidMode
+ * "1" - Enable XVidMode
+ *
+ * By default SDL will use XVidMode if it is available.
+ */
+#define SDL_HINT_VIDEO_X11_XVIDMODE "SDL_VIDEO_X11_XVIDMODE"
+
+/**
+ * \brief A variable controlling whether the X11 Xinerama extension should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable Xinerama
+ * "1" - Enable Xinerama
+ *
+ * By default SDL will use Xinerama if it is available.
+ */
+#define SDL_HINT_VIDEO_X11_XINERAMA "SDL_VIDEO_X11_XINERAMA"
+
+/**
+ * \brief A variable controlling whether the X11 XRandR extension should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable XRandR
+ * "1" - Enable XRandR
+ *
+ * By default SDL will not use XRandR because of window manager issues.
+ */
+#define SDL_HINT_VIDEO_X11_XRANDR "SDL_VIDEO_X11_XRANDR"
+
+/**
+ * \brief A variable controlling whether the X11 _NET_WM_PING protocol should be supported.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable _NET_WM_PING
+ * "1" - Enable _NET_WM_PING
+ *
+ * By default SDL will use _NET_WM_PING, but for applications that know they
+ * will not always be able to respond to ping requests in a timely manner they can
+ * turn it off to avoid the window manager thinking the app is hung.
+ * The hint is checked in CreateWindow.
+ */
+#define SDL_HINT_VIDEO_X11_NET_WM_PING "SDL_VIDEO_X11_NET_WM_PING"
+
+/**
+ * \brief A variable controlling whether the X11 _NET_WM_BYPASS_COMPOSITOR hint should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - Disable _NET_WM_BYPASS_COMPOSITOR
+ * "1" - Enable _NET_WM_BYPASS_COMPOSITOR
+ *
+ * By default SDL will use _NET_WM_BYPASS_COMPOSITOR
+ *
+ */
+#define SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR "SDL_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR"
+
+/**
+ * \brief A variable controlling whether the window frame and title bar are interactive when the cursor is hidden
+ *
+ * This variable can be set to the following values:
+ * "0" - The window frame is not interactive when the cursor is hidden (no move, resize, etc)
+ * "1" - The window frame is interactive when the cursor is hidden
+ *
+ * By default SDL will allow interaction with the window frame when the cursor is hidden
+ */
+#define SDL_HINT_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN "SDL_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN"
+
+/**
+ * \brief A variable to specify custom icon resource id from RC file on Windows platform
+ */
+#define SDL_HINT_WINDOWS_INTRESOURCE_ICON "SDL_WINDOWS_INTRESOURCE_ICON"
+#define SDL_HINT_WINDOWS_INTRESOURCE_ICON_SMALL "SDL_WINDOWS_INTRESOURCE_ICON_SMALL"
+
+/**
+ * \brief A variable controlling whether the windows message loop is processed by SDL
+ *
+ * This variable can be set to the following values:
+ * "0" - The window message loop is not run
+ * "1" - The window message loop is processed in SDL_PumpEvents()
+ *
+ * By default SDL will process the windows message loop
+ */
+#define SDL_HINT_WINDOWS_ENABLE_MESSAGELOOP "SDL_WINDOWS_ENABLE_MESSAGELOOP"
+
+/**
+ * \brief A variable controlling whether grabbing input grabs the keyboard
+ *
+ * This variable can be set to the following values:
+ * "0" - Grab will affect only the mouse
+ * "1" - Grab will affect mouse and keyboard
+ *
+ * By default SDL will not grab the keyboard so system shortcuts still work.
+ */
+#define SDL_HINT_GRAB_KEYBOARD "SDL_GRAB_KEYBOARD"
+
+/**
+ * \brief A variable setting the double click time, in milliseconds.
+ */
+#define SDL_HINT_MOUSE_DOUBLE_CLICK_TIME "SDL_MOUSE_DOUBLE_CLICK_TIME"
+
+/**
+ * \brief A variable setting the double click radius, in pixels.
+ */
+#define SDL_HINT_MOUSE_DOUBLE_CLICK_RADIUS "SDL_MOUSE_DOUBLE_CLICK_RADIUS"
+
+/**
+ * \brief A variable setting the speed scale for mouse motion, in floating point, when the mouse is not in relative mode
+ */
+#define SDL_HINT_MOUSE_NORMAL_SPEED_SCALE "SDL_MOUSE_NORMAL_SPEED_SCALE"
+
+/**
+ * \brief A variable setting the scale for mouse motion, in floating point, when the mouse is in relative mode
+ */
+#define SDL_HINT_MOUSE_RELATIVE_SPEED_SCALE "SDL_MOUSE_RELATIVE_SPEED_SCALE"
+
+/**
+ * \brief A variable controlling whether relative mouse mode is implemented using mouse warping
+ *
+ * This variable can be set to the following values:
+ * "0" - Relative mouse mode uses raw input
+ * "1" - Relative mouse mode uses mouse warping
+ *
+ * By default SDL will use raw input for relative mouse mode
+ */
+#define SDL_HINT_MOUSE_RELATIVE_MODE_WARP "SDL_MOUSE_RELATIVE_MODE_WARP"
+
+/**
+ * \brief Allow mouse click events when clicking to focus an SDL window
+ *
+ * This variable can be set to the following values:
+ * "0" - Ignore mouse clicks that activate a window
+ * "1" - Generate events for mouse clicks that activate a window
+ *
+ * By default SDL will ignore mouse clicks that activate a window
+ */
+#define SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH "SDL_MOUSE_FOCUS_CLICKTHROUGH"
+
+/**
+ * \brief A variable controlling whether touch events should generate synthetic mouse events
+ *
+ * This variable can be set to the following values:
+ * "0" - Touch events will not generate mouse events
+ * "1" - Touch events will generate mouse events
+ *
+ * By default SDL will generate mouse events for touch events
+ */
+#define SDL_HINT_TOUCH_MOUSE_EVENTS "SDL_TOUCH_MOUSE_EVENTS"
+
+/**
+ * \brief A variable controlling whether mouse events should generate synthetic touch events
+ *
+ * This variable can be set to the following values:
+ * "0" - Mouse events will not generate touch events (default for desktop platforms)
+ * "1" - Mouse events will generate touch events (default for mobile platforms, such as Android and iOS)
+ */
+
+#define SDL_HINT_MOUSE_TOUCH_EVENTS "SDL_MOUSE_TOUCH_EVENTS"
+
+/**
+ * \brief Minimize your SDL_Window if it loses key focus when in fullscreen mode. Defaults to true.
+ *
+ */
+#define SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS "SDL_VIDEO_MINIMIZE_ON_FOCUS_LOSS"
+
+/**
+ * \brief A variable controlling whether the idle timer is disabled on iOS.
+ *
+ * When an iOS app does not receive touches for some time, the screen is
+ * dimmed automatically. For games where the accelerometer is the only input
+ * this is problematic. This functionality can be disabled by setting this
+ * hint.
+ *
+ * As of SDL 2.0.4, SDL_EnableScreenSaver() and SDL_DisableScreenSaver()
+ * accomplish the same thing on iOS. They should be preferred over this hint.
+ *
+ * This variable can be set to the following values:
+ * "0" - Enable idle timer
+ * "1" - Disable idle timer
+ */
+#define SDL_HINT_IDLE_TIMER_DISABLED "SDL_IOS_IDLE_TIMER_DISABLED"
+
+/**
+ * \brief A variable controlling which orientations are allowed on iOS/Android.
+ *
+ * In some circumstances it is necessary to be able to explicitly control
+ * which UI orientations are allowed.
+ *
+ * This variable is a space delimited list of the following values:
+ * "LandscapeLeft", "LandscapeRight", "Portrait" "PortraitUpsideDown"
+ */
+#define SDL_HINT_ORIENTATIONS "SDL_IOS_ORIENTATIONS"
+
+/**
+ * \brief A variable controlling whether controllers used with the Apple TV
+ * generate UI events.
+ *
+ * When UI events are generated by controller input, the app will be
+ * backgrounded when the Apple TV remote's menu button is pressed, and when the
+ * pause or B buttons on gamepads are pressed.
+ *
+ * More information about properly making use of controllers for the Apple TV
+ * can be found here:
+ * https://developer.apple.com/tvos/human-interface-guidelines/remote-and-controllers/
+ *
+ * This variable can be set to the following values:
+ * "0" - Controller input does not generate UI events (the default).
+ * "1" - Controller input generates UI events.
+ */
+#define SDL_HINT_APPLE_TV_CONTROLLER_UI_EVENTS "SDL_APPLE_TV_CONTROLLER_UI_EVENTS"
+
+/**
+ * \brief A variable controlling whether the Apple TV remote's joystick axes
+ * will automatically match the rotation of the remote.
+ *
+ * This variable can be set to the following values:
+ * "0" - Remote orientation does not affect joystick axes (the default).
+ * "1" - Joystick axes are based on the orientation of the remote.
+ */
+#define SDL_HINT_APPLE_TV_REMOTE_ALLOW_ROTATION "SDL_APPLE_TV_REMOTE_ALLOW_ROTATION"
+
+/**
+ * \brief A variable controlling whether the home indicator bar on iPhone X
+ * should be hidden.
+ *
+ * This variable can be set to the following values:
+ * "0" - The indicator bar is not hidden (default for windowed applications)
+ * "1" - The indicator bar is hidden and is shown when the screen is touched (useful for movie playback applications)
+ * "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)
+ */
+#define SDL_HINT_IOS_HIDE_HOME_INDICATOR "SDL_IOS_HIDE_HOME_INDICATOR"
+
+/**
+ * \brief A variable controlling whether the Android / iOS built-in
+ * accelerometer should be listed as a joystick device.
+ *
+ * This variable can be set to the following values:
+ * "0" - The accelerometer is not listed as a joystick
+ * "1" - The accelerometer is available as a 3 axis joystick (the default).
+ */
+#define SDL_HINT_ACCELEROMETER_AS_JOYSTICK "SDL_ACCELEROMETER_AS_JOYSTICK"
+
+/**
+ * \brief A variable controlling whether the Android / tvOS remotes
+ * should be listed as joystick devices, instead of sending keyboard events.
+ *
+ * This variable can be set to the following values:
+ * "0" - Remotes send enter/escape/arrow key events
+ * "1" - Remotes are available as 2 axis, 2 button joysticks (the default).
+ */
+#define SDL_HINT_TV_REMOTE_AS_JOYSTICK "SDL_TV_REMOTE_AS_JOYSTICK"
+
+/**
+ * \brief A variable that lets you disable the detection and use of Xinput gamepad devices
+ *
+ * The variable can be set to the following values:
+ * "0" - Disable XInput detection (only uses direct input)
+ * "1" - Enable XInput detection (the default)
+ */
+#define SDL_HINT_XINPUT_ENABLED "SDL_XINPUT_ENABLED"
+
+/**
+ * \brief A variable that causes SDL to use the old axis and button mapping for XInput devices.
+ *
+ * This hint is for backwards compatibility only and will be removed in SDL 2.1
+ *
+ * The default value is "0". This hint must be set before SDL_Init()
+ */
+#define SDL_HINT_XINPUT_USE_OLD_JOYSTICK_MAPPING "SDL_XINPUT_USE_OLD_JOYSTICK_MAPPING"
+
+/**
+ * \brief A variable that lets you manually hint extra gamecontroller db entries.
+ *
+ * The variable should be newline delimited rows of gamecontroller config data, see SDL_gamecontroller.h
+ *
+ * This hint must be set before calling SDL_Init(SDL_INIT_GAMECONTROLLER)
+ * You can update mappings after the system is initialized with SDL_GameControllerMappingForGUID() and SDL_GameControllerAddMapping()
+ */
+#define SDL_HINT_GAMECONTROLLERCONFIG "SDL_GAMECONTROLLERCONFIG"
+
+/**
+ * \brief A variable that lets you provide a file with extra gamecontroller db entries.
+ *
+ * The file should contain lines of gamecontroller config data, see SDL_gamecontroller.h
+ *
+ * This hint must be set before calling SDL_Init(SDL_INIT_GAMECONTROLLER)
+ * You can update mappings after the system is initialized with SDL_GameControllerMappingForGUID() and SDL_GameControllerAddMapping()
+ */
+#define SDL_HINT_GAMECONTROLLERCONFIG_FILE "SDL_GAMECONTROLLERCONFIG_FILE"
+
+/**
+ * \brief A variable containing a list of devices to skip when scanning for game controllers.
+ *
+ * The format of the string is a comma separated list of USB VID/PID pairs
+ * in hexadecimal form, e.g.
+ *
+ * 0xAAAA/0xBBBB,0xCCCC/0xDDDD
+ *
+ * The variable can also take the form of @file, in which case the named
+ * file will be loaded and interpreted as the value of the variable.
+ */
+#define SDL_HINT_GAMECONTROLLER_IGNORE_DEVICES "SDL_GAMECONTROLLER_IGNORE_DEVICES"
+
+/**
+ * \brief If set, all devices will be skipped when scanning for game controllers except for the ones listed in this variable.
+ *
+ * The format of the string is a comma separated list of USB VID/PID pairs
+ * in hexadecimal form, e.g.
+ *
+ * 0xAAAA/0xBBBB,0xCCCC/0xDDDD
+ *
+ * The variable can also take the form of @file, in which case the named
+ * file will be loaded and interpreted as the value of the variable.
+ */
+#define SDL_HINT_GAMECONTROLLER_IGNORE_DEVICES_EXCEPT "SDL_GAMECONTROLLER_IGNORE_DEVICES_EXCEPT"
+
+/**
+ * \brief A variable that lets you enable joystick (and gamecontroller) events even when your app is in the background.
+ *
+ * The variable can be set to the following values:
+ * "0" - Disable joystick & gamecontroller input events when the
+ * application is in the background.
+ * "1" - Enable joystick & gamecontroller input events when the
+ * application is in the background.
+ *
+ * The default value is "0". This hint may be set at any time.
+ */
+#define SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS "SDL_JOYSTICK_ALLOW_BACKGROUND_EVENTS"
+
+/**
+ * \brief A variable controlling whether the HIDAPI joystick drivers should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - HIDAPI drivers are not used
+ * "1" - HIDAPI drivers are used (the default)
+ *
+ * This variable is the default for all drivers, but can be overridden by the hints for specific drivers below.
+ */
+#define SDL_HINT_JOYSTICK_HIDAPI "SDL_JOYSTICK_HIDAPI"
+
+/**
+ * \brief A variable controlling whether the HIDAPI driver for PS4 controllers should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - HIDAPI driver is not used
+ * "1" - HIDAPI driver is used
+ *
+ * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
+ */
+#define SDL_HINT_JOYSTICK_HIDAPI_PS4 "SDL_JOYSTICK_HIDAPI_PS4"
+
+/**
+ * \brief A variable controlling whether extended input reports should be used for PS4 controllers when using the HIDAPI driver.
+ *
+ * This variable can be set to the following values:
+ * "0" - extended reports are not enabled (the default)
+ * "1" - extended reports
+ *
+ * Extended input reports allow rumble on Bluetooth PS4 controllers, but
+ * break DirectInput handling for applications that don't use SDL.
+ *
+ * Once extended reports are enabled, they can not be disabled without
+ * power cycling the controller.
+ */
+#define SDL_HINT_JOYSTICK_HIDAPI_PS4_RUMBLE "SDL_JOYSTICK_HIDAPI_PS4_RUMBLE"
+
+/**
+ * \brief A variable controlling whether the HIDAPI driver for Steam Controllers should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - HIDAPI driver is not used
+ * "1" - HIDAPI driver is used
+ *
+ * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
+ */
+#define SDL_HINT_JOYSTICK_HIDAPI_STEAM "SDL_JOYSTICK_HIDAPI_STEAM"
+
+/**
+ * \brief A variable controlling whether the HIDAPI driver for Nintendo Switch controllers should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - HIDAPI driver is not used
+ * "1" - HIDAPI driver is used
+ *
+ * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
+ */
+#define SDL_HINT_JOYSTICK_HIDAPI_SWITCH "SDL_JOYSTICK_HIDAPI_SWITCH"
+
+/**
+ * \brief A variable controlling whether the HIDAPI driver for XBox controllers should be used.
+ *
+ * This variable can be set to the following values:
+ * "0" - HIDAPI driver is not used
+ * "1" - HIDAPI driver is used
+ *
+ * The default is the value of SDL_HINT_JOYSTICK_HIDAPI
+ */
+#define SDL_HINT_JOYSTICK_HIDAPI_XBOX "SDL_JOYSTICK_HIDAPI_XBOX"
+
+/**
+ * \brief A variable that controls whether Steam Controllers should be exposed using the SDL joystick and game controller APIs
+ *
+ * The variable can be set to the following values:
+ * "0" - Do not scan for Steam Controllers
+ * "1" - Scan for Steam Controllers (the default)
+ *
+ * The default value is "1". This hint must be set before initializing the joystick subsystem.
+ */
+#define SDL_HINT_ENABLE_STEAM_CONTROLLERS "SDL_ENABLE_STEAM_CONTROLLERS"
+
+
+/**
+ * \brief If set to "0" then never set the top most bit on a SDL Window, even if the video mode expects it.
+ * This is a debugging aid for developers and not expected to be used by end users. The default is "1"
+ *
+ * This variable can be set to the following values:
+ * "0" - don't allow topmost
+ * "1" - allow topmost
+ */
+#define SDL_HINT_ALLOW_TOPMOST "SDL_ALLOW_TOPMOST"
+
+/**
+ * \brief A variable that controls the timer resolution, in milliseconds.
+ *
+ * The higher resolution the timer, the more frequently the CPU services
+ * timer interrupts, and the more precise delays are, but this takes up
+ * power and CPU time. This hint is only used on Windows 7 and earlier.
+ *
+ * See this blog post for more information:
+ * http://randomascii.wordpress.com/2013/07/08/windows-timer-resolution-megawatts-wasted/
+ *
+ * If this variable is set to "0", the system timer resolution is not set.
+ *
+ * The default value is "1". This hint may be set at any time.
+ */
+#define SDL_HINT_TIMER_RESOLUTION "SDL_TIMER_RESOLUTION"
+
+
+/**
+ * \brief A variable describing the content orientation on QtWayland-based platforms.
+ *
+ * On QtWayland platforms, windows are rotated client-side to allow for custom
+ * transitions. In order to correctly position overlays (e.g. volume bar) and
+ * gestures (e.g. events view, close/minimize gestures), the system needs to
+ * know in which orientation the application is currently drawing its contents.
+ *
+ * This does not cause the window to be rotated or resized, the application
+ * needs to take care of drawing the content in the right orientation (the
+ * framebuffer is always in portrait mode).
+ *
+ * This variable can be one of the following values:
+ * "primary" (default), "portrait", "landscape", "inverted-portrait", "inverted-landscape"
+ */
+#define SDL_HINT_QTWAYLAND_CONTENT_ORIENTATION "SDL_QTWAYLAND_CONTENT_ORIENTATION"
+
+/**
+ * \brief Flags to set on QtWayland windows to integrate with the native window manager.
+ *
+ * On QtWayland platforms, this hint controls the flags to set on the windows.
+ * For example, on Sailfish OS "OverridesSystemGestures" disables swipe gestures.
+ *
+ * This variable is a space-separated list of the following values (empty = no flags):
+ * "OverridesSystemGestures", "StaysOnTop", "BypassWindowManager"
+ */
+#define SDL_HINT_QTWAYLAND_WINDOW_FLAGS "SDL_QTWAYLAND_WINDOW_FLAGS"
+
+/**
+* \brief A string specifying SDL's threads stack size in bytes or "0" for the backend's default size
+*
+* Use this hint in case you need to set SDL's threads stack size to other than the default.
+* This is specially useful if you build SDL against a non glibc libc library (such as musl) which
+* provides a relatively small default thread stack size (a few kilobytes versus the default 8MB glibc uses).
+* Support for this hint is currently available only in the pthread, Windows, and PSP backend.
+*
+* Instead of this hint, in 2.0.9 and later, you can use
+* SDL_CreateThreadWithStackSize(). This hint only works with the classic
+* SDL_CreateThread().
+*/
+#define SDL_HINT_THREAD_STACK_SIZE "SDL_THREAD_STACK_SIZE"
+
+/**
+ * \brief If set to 1, then do not allow high-DPI windows. ("Retina" on Mac and iOS)
+ */
+#define SDL_HINT_VIDEO_HIGHDPI_DISABLED "SDL_VIDEO_HIGHDPI_DISABLED"
+
+/**
+ * \brief A variable that determines whether ctrl+click should generate a right-click event on Mac
+ *
+ * If present, holding ctrl while left clicking will generate a right click
+ * event when on Mac.
+ */
+#define SDL_HINT_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK "SDL_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK"
+
+/**
+* \brief A variable specifying which shader compiler to preload when using the Chrome ANGLE binaries
+*
+* SDL has EGL and OpenGL ES2 support on Windows via the ANGLE project. It
+* can use two different sets of binaries, those compiled by the user from source
+* or those provided by the Chrome browser. In the later case, these binaries require
+* that SDL loads a DLL providing the shader compiler.
+*
+* This variable can be set to the following values:
+* "d3dcompiler_46.dll" - default, best for Vista or later.
+* "d3dcompiler_43.dll" - for XP support.
+* "none" - do not load any library, useful if you compiled ANGLE from source and included the compiler in your binaries.
+*
+*/
+#define SDL_HINT_VIDEO_WIN_D3DCOMPILER "SDL_VIDEO_WIN_D3DCOMPILER"
+
+/**
+* \brief A variable that is the address of another SDL_Window* (as a hex string formatted with "%p").
+*
+* If this hint is set before SDL_CreateWindowFrom() and the SDL_Window* it is set to has
+* SDL_WINDOW_OPENGL set (and running on WGL only, currently), then two things will occur on the newly
+* created SDL_Window:
+*
+* 1. Its pixel format will be set to the same pixel format as this SDL_Window. This is
+* needed for example when sharing an OpenGL context across multiple windows.
+*
+* 2. The flag SDL_WINDOW_OPENGL will be set on the new window so it can be used for
+* OpenGL rendering.
+*
+* This variable can be set to the following values:
+* The address (as a string "%p") of the SDL_Window* that new windows created with SDL_CreateWindowFrom() should
+* share a pixel format with.
+*/
+#define SDL_HINT_VIDEO_WINDOW_SHARE_PIXEL_FORMAT "SDL_VIDEO_WINDOW_SHARE_PIXEL_FORMAT"
+
+/**
+ * \brief A URL to a WinRT app's privacy policy
+ *
+ * All network-enabled WinRT apps must make a privacy policy available to its
+ * users. On Windows 8, 8.1, and RT, Microsoft mandates that this policy be
+ * be available in the Windows Settings charm, as accessed from within the app.
+ * SDL provides code to add a URL-based link there, which can point to the app's
+ * privacy policy.
+ *
+ * To setup a URL to an app's privacy policy, set SDL_HINT_WINRT_PRIVACY_POLICY_URL
+ * before calling any SDL_Init() functions. The contents of the hint should
+ * be a valid URL. For example, "http://www.example.com".
+ *
+ * The default value is "", which will prevent SDL from adding a privacy policy
+ * link to the Settings charm. This hint should only be set during app init.
+ *
+ * The label text of an app's "Privacy Policy" link may be customized via another
+ * hint, SDL_HINT_WINRT_PRIVACY_POLICY_LABEL.
+ *
+ * Please note that on Windows Phone, Microsoft does not provide standard UI
+ * for displaying a privacy policy link, and as such, SDL_HINT_WINRT_PRIVACY_POLICY_URL
+ * will not get used on that platform. Network-enabled phone apps should display
+ * their privacy policy through some other, in-app means.
+ */
+#define SDL_HINT_WINRT_PRIVACY_POLICY_URL "SDL_WINRT_PRIVACY_POLICY_URL"
+
+/** \brief Label text for a WinRT app's privacy policy link
+ *
+ * Network-enabled WinRT apps must include a privacy policy. On Windows 8, 8.1, and RT,
+ * Microsoft mandates that this policy be available via the Windows Settings charm.
+ * SDL provides code to add a link there, with its label text being set via the
+ * optional hint, SDL_HINT_WINRT_PRIVACY_POLICY_LABEL.
+ *
+ * Please note that a privacy policy's contents are not set via this hint. A separate
+ * hint, SDL_HINT_WINRT_PRIVACY_POLICY_URL, is used to link to the actual text of the
+ * policy.
+ *
+ * The contents of this hint should be encoded as a UTF8 string.
+ *
+ * The default value is "Privacy Policy". This hint should only be set during app
+ * initialization, preferably before any calls to SDL_Init().
+ *
+ * For additional information on linking to a privacy policy, see the documentation for
+ * SDL_HINT_WINRT_PRIVACY_POLICY_URL.
+ */
+#define SDL_HINT_WINRT_PRIVACY_POLICY_LABEL "SDL_WINRT_PRIVACY_POLICY_LABEL"
+
+/** \brief Allows back-button-press events on Windows Phone to be marked as handled
+ *
+ * Windows Phone devices typically feature a Back button. When pressed,
+ * the OS will emit back-button-press events, which apps are expected to
+ * handle in an appropriate manner. If apps do not explicitly mark these
+ * events as 'Handled', then the OS will invoke its default behavior for
+ * unhandled back-button-press events, which on Windows Phone 8 and 8.1 is to
+ * terminate the app (and attempt to switch to the previous app, or to the
+ * device's home screen).
+ *
+ * Setting the SDL_HINT_WINRT_HANDLE_BACK_BUTTON hint to "1" will cause SDL
+ * to mark back-button-press events as Handled, if and when one is sent to
+ * the app.
+ *
+ * Internally, Windows Phone sends back button events as parameters to
+ * special back-button-press callback functions. Apps that need to respond
+ * to back-button-press events are expected to register one or more
+ * callback functions for such, shortly after being launched (during the
+ * app's initialization phase). After the back button is pressed, the OS
+ * will invoke these callbacks. If the app's callback(s) do not explicitly
+ * mark the event as handled by the time they return, or if the app never
+ * registers one of these callback, the OS will consider the event
+ * un-handled, and it will apply its default back button behavior (terminate
+ * the app).
+ *
+ * SDL registers its own back-button-press callback with the Windows Phone
+ * OS. This callback will emit a pair of SDL key-press events (SDL_KEYDOWN
+ * and SDL_KEYUP), each with a scancode of SDL_SCANCODE_AC_BACK, after which
+ * it will check the contents of the hint, SDL_HINT_WINRT_HANDLE_BACK_BUTTON.
+ * If the hint's value is set to "1", the back button event's Handled
+ * property will get set to 'true'. If the hint's value is set to something
+ * else, or if it is unset, SDL will leave the event's Handled property
+ * alone. (By default, the OS sets this property to 'false', to note.)
+ *
+ * SDL apps can either set SDL_HINT_WINRT_HANDLE_BACK_BUTTON well before a
+ * back button is pressed, or can set it in direct-response to a back button
+ * being pressed.
+ *
+ * In order to get notified when a back button is pressed, SDL apps should
+ * register a callback function with SDL_AddEventWatch(), and have it listen
+ * for SDL_KEYDOWN events that have a scancode of SDL_SCANCODE_AC_BACK.
+ * (Alternatively, SDL_KEYUP events can be listened-for. Listening for
+ * either event type is suitable.) Any value of SDL_HINT_WINRT_HANDLE_BACK_BUTTON
+ * set by such a callback, will be applied to the OS' current
+ * back-button-press event.
+ *
+ * More details on back button behavior in Windows Phone apps can be found
+ * at the following page, on Microsoft's developer site:
+ * http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj247550(v=vs.105).aspx
+ */
+#define SDL_HINT_WINRT_HANDLE_BACK_BUTTON "SDL_WINRT_HANDLE_BACK_BUTTON"
+
+/**
+ * \brief A variable that dictates policy for fullscreen Spaces on Mac OS X.
+ *
+ * This hint only applies to Mac OS X.
+ *
+ * The variable can be set to the following values:
+ * "0" - Disable Spaces support (FULLSCREEN_DESKTOP won't use them and
+ * SDL_WINDOW_RESIZABLE windows won't offer the "fullscreen"
+ * button on their titlebars).
+ * "1" - Enable Spaces support (FULLSCREEN_DESKTOP will use them and
+ * SDL_WINDOW_RESIZABLE windows will offer the "fullscreen"
+ * button on their titlebars).
+ *
+ * The default value is "1". Spaces are disabled regardless of this hint if
+ * the OS isn't at least Mac OS X Lion (10.7). This hint must be set before
+ * any windows are created.
+ */
+#define SDL_HINT_VIDEO_MAC_FULLSCREEN_SPACES "SDL_VIDEO_MAC_FULLSCREEN_SPACES"
+
+/**
+* \brief When set don't force the SDL app to become a foreground process
+*
+* This hint only applies to Mac OS X.
+*
+*/
+#define SDL_HINT_MAC_BACKGROUND_APP "SDL_MAC_BACKGROUND_APP"
+
+/**
+ * \brief Android APK expansion main file version. Should be a string number like "1", "2" etc.
+ *
+ * Must be set together with SDL_HINT_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION.
+ *
+ * If both hints were set then SDL_RWFromFile() will look into expansion files
+ * after a given relative path was not found in the internal storage and assets.
+ *
+ * By default this hint is not set and the APK expansion files are not searched.
+ */
+#define SDL_HINT_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION "SDL_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION"
+
+/**
+ * \brief Android APK expansion patch file version. Should be a string number like "1", "2" etc.
+ *
+ * Must be set together with SDL_HINT_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION.
+ *
+ * If both hints were set then SDL_RWFromFile() will look into expansion files
+ * after a given relative path was not found in the internal storage and assets.
+ *
+ * By default this hint is not set and the APK expansion files are not searched.
+ */
+#define SDL_HINT_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION "SDL_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION"
+
+/**
+ * \brief A variable to control whether certain IMEs should handle text editing internally instead of sending SDL_TEXTEDITING events.
+ *
+ * The variable can be set to the following values:
+ * "0" - SDL_TEXTEDITING events are sent, and it is the application's
+ * responsibility to render the text from these events and
+ * differentiate it somehow from committed text. (default)
+ * "1" - If supported by the IME then SDL_TEXTEDITING events are not sent,
+ * and text that is being composed will be rendered in its own UI.
+ */
+#define SDL_HINT_IME_INTERNAL_EDITING "SDL_IME_INTERNAL_EDITING"
+
+/**
+ * \brief A variable to control whether we trap the Android back button to handle it manually.
+ * This is necessary for the right mouse button to work on some Android devices, or
+ * to be able to trap the back button for use in your code reliably. If set to true,
+ * the back button will show up as an SDL_KEYDOWN / SDL_KEYUP pair with a keycode of
+ * SDL_SCANCODE_AC_BACK.
+ *
+ * The variable can be set to the following values:
+ * "0" - Back button will be handled as usual for system. (default)
+ * "1" - Back button will be trapped, allowing you to handle the key press
+ * manually. (This will also let right mouse click work on systems
+ * where the right mouse button functions as back.)
+ *
+ * The value of this hint is used at runtime, so it can be changed at any time.
+ */
+#define SDL_HINT_ANDROID_TRAP_BACK_BUTTON "SDL_ANDROID_TRAP_BACK_BUTTON"
+
+/**
+ * \brief A variable to control whether the event loop will block itself when the app is paused.
+ *
+ * The variable can be set to the following values:
+ * "0" - Non blocking.
+ * "1" - Blocking. (default)
+ *
+ * The value should be set before SDL is initialized.
+ */
+#define SDL_HINT_ANDROID_BLOCK_ON_PAUSE "SDL_ANDROID_BLOCK_ON_PAUSE"
+
+ /**
+ * \brief A variable to control whether the return key on the soft keyboard
+ * should hide the soft keyboard on Android and iOS.
+ *
+ * The variable can be set to the following values:
+ * "0" - The return key will be handled as a key event. This is the behaviour of SDL <= 2.0.3. (default)
+ * "1" - The return key will hide the keyboard.
+ *
+ * The value of this hint is used at runtime, so it can be changed at any time.
+ */
+#define SDL_HINT_RETURN_KEY_HIDES_IME "SDL_RETURN_KEY_HIDES_IME"
+
+/**
+ * \brief override the binding element for keyboard inputs for Emscripten builds
+ *
+ * This hint only applies to the emscripten platform
+ *
+ * The variable can be one of
+ * "#window" - The javascript window object (this is the default)
+ * "#document" - The javascript document object
+ * "#screen" - the javascript window.screen object
+ * "#canvas" - the WebGL canvas element
+ * any other string without a leading # sign applies to the element on the page with that ID.
+ */
+#define SDL_HINT_EMSCRIPTEN_KEYBOARD_ELEMENT "SDL_EMSCRIPTEN_KEYBOARD_ELEMENT"
+
+/**
+ * \brief Tell SDL not to catch the SIGINT or SIGTERM signals.
+ *
+ * This hint only applies to Unix-like platforms.
+ *
+ * The variable can be set to the following values:
+ * "0" - SDL will install a SIGINT and SIGTERM handler, and when it
+ * catches a signal, convert it into an SDL_QUIT event.
+ * "1" - SDL will not install a signal handler at all.
+ */
+#define SDL_HINT_NO_SIGNAL_HANDLERS "SDL_NO_SIGNAL_HANDLERS"
+
+/**
+ * \brief Tell SDL not to generate window-close events for Alt+F4 on Windows.
+ *
+ * The variable can be set to the following values:
+ * "0" - SDL will generate a window-close event when it sees Alt+F4.
+ * "1" - SDL will only do normal key handling for Alt+F4.
+ */
+#define SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4 "SDL_WINDOWS_NO_CLOSE_ON_ALT_F4"
+
+/**
+ * \brief Prevent SDL from using version 4 of the bitmap header when saving BMPs.
+ *
+ * The bitmap header version 4 is required for proper alpha channel support and
+ * SDL will use it when required. Should this not be desired, this hint can
+ * force the use of the 40 byte header version which is supported everywhere.
+ *
+ * The variable can be set to the following values:
+ * "0" - Surfaces with a colorkey or an alpha channel are saved to a
+ * 32-bit BMP file with an alpha mask. SDL will use the bitmap
+ * header version 4 and set the alpha mask accordingly.
+ * "1" - Surfaces with a colorkey or an alpha channel are saved to a
+ * 32-bit BMP file without an alpha mask. The alpha channel data
+ * will be in the file, but applications are going to ignore it.
+ *
+ * The default value is "0".
+ */
+#define SDL_HINT_BMP_SAVE_LEGACY_FORMAT "SDL_BMP_SAVE_LEGACY_FORMAT"
+
+/**
+ * \brief Tell SDL not to name threads on Windows with the 0x406D1388 Exception.
+ * The 0x406D1388 Exception is a trick used to inform Visual Studio of a
+ * thread's name, but it tends to cause problems with other debuggers,
+ * and the .NET runtime. Note that SDL 2.0.6 and later will still use
+ * the (safer) SetThreadDescription API, introduced in the Windows 10
+ * Creators Update, if available.
+ *
+ * The variable can be set to the following values:
+ * "0" - SDL will raise the 0x406D1388 Exception to name threads.
+ * This is the default behavior of SDL <= 2.0.4.
+ * "1" - SDL will not raise this exception, and threads will be unnamed. (default)
+ * This is necessary with .NET languages or debuggers that aren't Visual Studio.
+ */
+#define SDL_HINT_WINDOWS_DISABLE_THREAD_NAMING "SDL_WINDOWS_DISABLE_THREAD_NAMING"
+
+/**
+ * \brief Tell SDL which Dispmanx layer to use on a Raspberry PI
+ *
+ * Also known as Z-order. The variable can take a negative or positive value.
+ * The default is 10000.
+ */
+#define SDL_HINT_RPI_VIDEO_LAYER "SDL_RPI_VIDEO_LAYER"
+
+/**
+ * \brief Tell the video driver that we only want a double buffer.
+ *
+ * By default, most lowlevel 2D APIs will use a triple buffer scheme that
+ * wastes no CPU time on waiting for vsync after issuing a flip, but
+ * introduces a frame of latency. On the other hand, using a double buffer
+ * scheme instead is recommended for cases where low latency is an important
+ * factor because we save a whole frame of latency.
+ * We do so by waiting for vsync immediately after issuing a flip, usually just
+ * after eglSwapBuffers call in the backend's *_SwapWindow function.
+ *
+ * Since it's driver-specific, it's only supported where possible and
+ * implemented. Currently supported the following drivers:
+ * - KMSDRM (kmsdrm)
+ * - Raspberry Pi (raspberrypi)
+ */
+#define SDL_HINT_VIDEO_DOUBLE_BUFFER "SDL_VIDEO_DOUBLE_BUFFER"
+
+/**
+ * \brief A variable controlling what driver to use for OpenGL ES contexts.
+ *
+ * On some platforms, currently Windows and X11, OpenGL drivers may support
+ * creating contexts with an OpenGL ES profile. By default SDL uses these
+ * profiles, when available, otherwise it attempts to load an OpenGL ES
+ * library, e.g. that provided by the ANGLE project. This variable controls
+ * whether SDL follows this default behaviour or will always load an
+ * OpenGL ES library.
+ *
+ * Circumstances where this is useful include
+ * - Testing an app with a particular OpenGL ES implementation, e.g ANGLE,
+ * or emulator, e.g. those from ARM, Imagination or Qualcomm.
+ * - Resolving OpenGL ES function addresses at link time by linking with
+ * the OpenGL ES library instead of querying them at run time with
+ * SDL_GL_GetProcAddress().
+ *
+ * Caution: for an application to work with the default behaviour across
+ * different OpenGL drivers it must query the OpenGL ES function
+ * addresses at run time using SDL_GL_GetProcAddress().
+ *
+ * This variable is ignored on most platforms because OpenGL ES is native
+ * or not supported.
+ *
+ * This variable can be set to the following values:
+ * "0" - Use ES profile of OpenGL, if available. (Default when not set.)
+ * "1" - Load OpenGL ES library using the default library names.
+ *
+ */
+#define SDL_HINT_OPENGL_ES_DRIVER "SDL_OPENGL_ES_DRIVER"
+
+/**
+ * \brief A variable controlling speed/quality tradeoff of audio resampling.
+ *
+ * If available, SDL can use libsamplerate ( http://www.mega-nerd.com/SRC/ )
+ * to handle audio resampling. There are different resampling modes available
+ * that produce different levels of quality, using more CPU.
+ *
+ * If this hint isn't specified to a valid setting, or libsamplerate isn't
+ * available, SDL will use the default, internal resampling algorithm.
+ *
+ * Note that this is currently only applicable to resampling audio that is
+ * being written to a device for playback or audio being read from a device
+ * for capture. SDL_AudioCVT always uses the default resampler (although this
+ * might change for SDL 2.1).
+ *
+ * This hint is currently only checked at audio subsystem initialization.
+ *
+ * This variable can be set to the following values:
+ *
+ * "0" or "default" - Use SDL's internal resampling (Default when not set - low quality, fast)
+ * "1" or "fast" - Use fast, slightly higher quality resampling, if available
+ * "2" or "medium" - Use medium quality resampling, if available
+ * "3" or "best" - Use high quality resampling, if available
+ */
+#define SDL_HINT_AUDIO_RESAMPLING_MODE "SDL_AUDIO_RESAMPLING_MODE"
+
+/**
+ * \brief A variable controlling the audio category on iOS and Mac OS X
+ *
+ * This variable can be set to the following values:
+ *
+ * "ambient" - Use the AVAudioSessionCategoryAmbient audio category, will be muted by the phone mute switch (default)
+ * "playback" - Use the AVAudioSessionCategoryPlayback category
+ *
+ * For more information, see Apple's documentation:
+ * https://developer.apple.com/library/content/documentation/Audio/Conceptual/AudioSessionProgrammingGuide/AudioSessionCategoriesandModes/AudioSessionCategoriesandModes.html
+ */
+#define SDL_HINT_AUDIO_CATEGORY "SDL_AUDIO_CATEGORY"
+
+/**
+ * \brief A variable controlling whether the 2D render API is compatible or efficient.
+ *
+ * This variable can be set to the following values:
+ *
+ * "0" - Don't use batching to make rendering more efficient.
+ * "1" - Use batching, but might cause problems if app makes its own direct OpenGL calls.
+ *
+ * Up to SDL 2.0.9, the render API would draw immediately when requested. Now
+ * it batches up draw requests and sends them all to the GPU only when forced
+ * to (during SDL_RenderPresent, when changing render targets, by updating a
+ * texture that the batch needs, etc). This is significantly more efficient,
+ * but it can cause problems for apps that expect to render on top of the
+ * render API's output. As such, SDL will disable batching if a specific
+ * render backend is requested (since this might indicate that the app is
+ * planning to use the underlying graphics API directly). This hint can
+ * be used to explicitly request batching in this instance. It is a contract
+ * that you will either never use the underlying graphics API directly, or
+ * if you do, you will call SDL_RenderFlush() before you do so any current
+ * batch goes to the GPU before your work begins. Not following this contract
+ * will result in undefined behavior.
+ */
+#define SDL_HINT_RENDER_BATCHING "SDL_RENDER_BATCHING"
+
+
+/**
+ * \brief A variable controlling whether SDL logs all events pushed onto its internal queue.
+ *
+ * This variable can be set to the following values:
+ *
+ * "0" - Don't log any events (default)
+ * "1" - Log all events except mouse and finger motion, which are pretty spammy.
+ * "2" - Log all events.
+ *
+ * This is generally meant to be used to debug SDL itself, but can be useful
+ * for application developers that need better visibility into what is going
+ * on in the event queue. Logged events are sent through SDL_Log(), which
+ * means by default they appear on stdout on most platforms or maybe
+ * OutputDebugString() on Windows, and can be funneled by the app with
+ * SDL_LogSetOutputFunction(), etc.
+ *
+ * This hint can be toggled on and off at runtime, if you only need to log
+ * events for a small subset of program execution.
+ */
+#define SDL_HINT_EVENT_LOGGING "SDL_EVENT_LOGGING"
+
+
+
+/**
+ * \brief Controls how the size of the RIFF chunk affects the loading of a WAVE file.
+ *
+ * The size of the RIFF chunk (which includes all the sub-chunks of the WAVE
+ * file) is not always reliable. In case the size is wrong, it's possible to
+ * just ignore it and step through the chunks until a fixed limit is reached.
+ *
+ * Note that files that have trailing data unrelated to the WAVE file or
+ * corrupt files may slow down the loading process without a reliable boundary.
+ * By default, SDL stops after 10000 chunks to prevent wasting time. Use the
+ * environment variable SDL_WAVE_CHUNK_LIMIT to adjust this value.
+ *
+ * This variable can be set to the following values:
+ *
+ * "force" - Always use the RIFF chunk size as a boundary for the chunk search
+ * "ignorezero" - Like "force", but a zero size searches up to 4 GiB (default)
+ * "ignore" - Ignore the RIFF chunk size and always search up to 4 GiB
+ * "maximum" - Search for chunks until the end of file (not recommended)
+ */
+#define SDL_HINT_WAVE_RIFF_CHUNK_SIZE "SDL_WAVE_RIFF_CHUNK_SIZE"
+
+/**
+ * \brief Controls how a truncated WAVE file is handled.
+ *
+ * A WAVE file is considered truncated if any of the chunks are incomplete or
+ * the data chunk size is not a multiple of the block size. By default, SDL
+ * decodes until the first incomplete block, as most applications seem to do.
+ *
+ * This variable can be set to the following values:
+ *
+ * "verystrict" - Raise an error if the file is truncated
+ * "strict" - Like "verystrict", but the size of the RIFF chunk is ignored
+ * "dropframe" - Decode until the first incomplete sample frame
+ * "dropblock" - Decode until the first incomplete block (default)
+ */
+#define SDL_HINT_WAVE_TRUNCATION "SDL_WAVE_TRUNCATION"
+
+/**
+ * \brief Controls how the fact chunk affects the loading of a WAVE file.
+ *
+ * The fact chunk stores information about the number of samples of a WAVE
+ * file. The Standards Update from Microsoft notes that this value can be used
+ * to 'determine the length of the data in seconds'. This is especially useful
+ * for compressed formats (for which this is a mandatory chunk) if they produce
+ * multiple sample frames per block and truncating the block is not allowed.
+ * The fact chunk can exactly specify how many sample frames there should be
+ * in this case.
+ *
+ * Unfortunately, most application seem to ignore the fact chunk and so SDL
+ * ignores it by default as well.
+ *
+ * This variable can be set to the following values:
+ *
+ * "truncate" - Use the number of samples to truncate the wave data if
+ * the fact chunk is present and valid
+ * "strict" - Like "truncate", but raise an error if the fact chunk
+ * is invalid, not present for non-PCM formats, or if the
+ * data chunk doesn't have that many samples
+ * "ignorezero" - Like "truncate", but ignore fact chunk if the number of
+ * samples is zero
+ * "ignore" - Ignore fact chunk entirely (default)
+ */
+#define SDL_HINT_WAVE_FACT_CHUNK "SDL_WAVE_FACT_CHUNK"
+
+/**
+ * \brief An enumeration of hint priorities
+ */
+typedef enum
+{
+ SDL_HINT_DEFAULT,
+ SDL_HINT_NORMAL,
+ SDL_HINT_OVERRIDE
+} SDL_HintPriority;
+
+
+/**
+ * \brief Set a hint with a specific priority
+ *
+ * The priority controls the behavior when setting a hint that already
+ * has a value. Hints will replace existing hints of their priority and
+ * lower. Environment variables are considered to have override priority.
+ *
+ * \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_SetHintWithPriority(const char *name,
+ const char *value,
+ SDL_HintPriority priority);
+
+/**
+ * \brief Set a hint with normal priority
+ *
+ * \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_SetHint(const char *name,
+ const char *value);
+
+/**
+ * \brief Get a hint
+ *
+ * \return The string value of a hint variable.
+ */
+extern DECLSPEC const char * SDLCALL SDL_GetHint(const char *name);
+
+/**
+ * \brief Get a hint
+ *
+ * \return The boolean value of a hint variable.
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_GetHintBoolean(const char *name, SDL_bool default_value);
+
+/**
+ * \brief type definition of the hint callback function.
+ */
+typedef void (SDLCALL *SDL_HintCallback)(void *userdata, const char *name, const char *oldValue, const char *newValue);
+
+/**
+ * \brief Add a function to watch a particular hint
+ *
+ * \param name The hint to watch
+ * \param callback The function to call when the hint value changes
+ * \param userdata A pointer to pass to the callback function
+ */
+extern DECLSPEC void SDLCALL SDL_AddHintCallback(const char *name,
+ SDL_HintCallback callback,
+ void *userdata);
+
+/**
+ * \brief Remove a function watching a particular hint
+ *
+ * \param name The hint being watched
+ * \param callback The function being called when the hint value changes
+ * \param userdata A pointer being passed to the callback function
+ */
+extern DECLSPEC void SDLCALL SDL_DelHintCallback(const char *name,
+ SDL_HintCallback callback,
+ void *userdata);
+
+/**
+ * \brief Clear all hints
+ *
+ * This function is called during SDL_Quit() to free stored hints.
+ */
+extern DECLSPEC void SDLCALL SDL_ClearHints(void);
+
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include "close_code.h"
+
+#endif /* SDL_hints_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
projects / xonotic / xonotic.git / blobdiff