/*************************************************************************
 * GLFW 3.4 - www.glfw.org
 * A library for OpenGL, window and input
 *------------------------------------------------------------------------
 * Copyright (c) 2002-2006 Marcus Geelnard
 * Copyright (c) 2006-2019 Camilla Löwy <elmindreda@glfw.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.
 *
 *************************************************************************/

#ifndef _glfw3_h_
#define _glfw3_h_

#ifdef __cplusplus
extern "C" {
#endif


/*************************************************************************
 * Doxygen documentation
 *************************************************************************/

/*! @file glfw3.h
 *  @brief The header of the GLFW 3 API.
 *
 *  This is the header file of the GLFW 3 API.  It defines all its types and
 *  declares all its functions.
 *
 *  For more information about how to use this file, see @ref build_include.
 */
/*! @defgroup context Context reference
 *  @brief Functions and types related to OpenGL and OpenGL ES contexts.
 *
 *  This is the reference documentation for OpenGL and OpenGL ES context related
 *  functions.  For more task-oriented information, see the @ref context_guide.
 */
/*! @defgroup vulkan Vulkan support reference
 *  @brief Functions and types related to Vulkan.
 *
 *  This is the reference documentation for Vulkan related functions and types.
 *  For more task-oriented information, see the @ref vulkan_guide.
 */
/*! @defgroup init Initialization, version and error reference
 *  @brief Functions and types related to initialization and error handling.
 *
 *  This is the reference documentation for initialization and termination of
 *  the library, version management and error handling.  For more task-oriented
 *  information, see the @ref intro_guide.
 */
/*! @defgroup input Input reference
 *  @brief Functions and types related to input handling.
 *
 *  This is the reference documentation for input related functions and types.
 *  For more task-oriented information, see the @ref input_guide.
 */
/*! @defgroup monitor Monitor reference
 *  @brief Functions and types related to monitors.
 *
 *  This is the reference documentation for monitor related functions and types.
 *  For more task-oriented information, see the @ref monitor_guide.
 */
/*! @defgroup window Window reference
 *  @brief Functions and types related to windows.
 *
 *  This is the reference documentation for window related functions and types,
 *  including creation, deletion and event polling.  For more task-oriented
 *  information, see the @ref window_guide.
 */


/*************************************************************************
 * Compiler- and platform-specific preprocessor work
 *************************************************************************/

/* If we are we on Windows, we want a single define for it.
 */
#if !defined(_WIN32) && (defined(__WIN32__) || defined(WIN32) || defined(__MINGW32__))
 #define _WIN32
#endif /* _WIN32 */

/* Include because most Windows GLU headers need wchar_t and
 * the macOS OpenGL header blocks the definition of ptrdiff_t by glext.h.
 * Include it unconditionally to avoid surprising side-effects.
 */
#include <stddef.h>

/* Include because it is needed by Vulkan and related functions.
 * Include it unconditionally to avoid surprising side-effects.
 */
#include <stdint.h>

#if defined(GLFW_INCLUDE_VULKAN)
  #include <vulkan/vulkan.h>
#endif /* Vulkan header */

/* The Vulkan header may have indirectly included windows.h (because of
 * VK_USE_PLATFORM_WIN32_KHR) so we offer our replacement symbols after it.
 */

/* It is customary to use APIENTRY for OpenGL function pointer declarations on
 * all platforms.  Additionally, the Windows OpenGL header needs APIENTRY.
 */
#if !defined(APIENTRY)
 #if defined(_WIN32)
  #define APIENTRY __stdcall
 #else
  #define APIENTRY
 #endif
 #define GLFW_APIENTRY_DEFINED
#endif /* APIENTRY */

/* Some Windows OpenGL headers need this.
 */
#if !defined(WINGDIAPI) && defined(_WIN32)
 #define WINGDIAPI __declspec(dllimport)
 #define GLFW_WINGDIAPI_DEFINED
#endif /* WINGDIAPI */

/* Some Windows GLU headers need this.
 */
#if !defined(CALLBACK) && defined(_WIN32)
 #define CALLBACK __stdcall
 #define GLFW_CALLBACK_DEFINED
#endif /* CALLBACK */

/* Include the chosen OpenGL or OpenGL ES headers.
 */
#if defined(GLFW_INCLUDE_ES1)

 #include <GLES/gl.h>
 #if defined(GLFW_INCLUDE_GLEXT)
  #include <GLES/glext.h>
 #endif

#elif defined(GLFW_INCLUDE_ES2)

 #include <GLES2/gl2.h>
 #if defined(GLFW_INCLUDE_GLEXT)
  #include <GLES2/gl2ext.h>
 #endif

#elif defined(GLFW_INCLUDE_ES3)

 #include <GLES3/gl3.h>
 #if defined(GLFW_INCLUDE_GLEXT)
  #include <GLES2/gl2ext.h>
 #endif

#elif defined(GLFW_INCLUDE_ES31)

 #include <GLES3/gl31.h>
 #if defined(GLFW_INCLUDE_GLEXT)
  #include <GLES2/gl2ext.h>
 #endif

#elif defined(GLFW_INCLUDE_ES32)

 #include <GLES3/gl32.h>
 #if defined(GLFW_INCLUDE_GLEXT)
  #include <GLES2/gl2ext.h>
 #endif

#elif defined(GLFW_INCLUDE_GLCOREARB)

 #if defined(__APPLE__)

  #include <OpenGL/gl3.h>
  #if defined(GLFW_INCLUDE_GLEXT)
   #include <OpenGL/gl3ext.h>
  #endif /*GLFW_INCLUDE_GLEXT*/

 #else /*__APPLE__*/

  #include <GL/glcorearb.h>

 #endif /*__APPLE__*/

#elif !defined(GLFW_INCLUDE_NONE)

 #if defined(__APPLE__)

  #if !defined(GLFW_INCLUDE_GLEXT)
   #define GL_GLEXT_LEGACY
  #endif
  #include <OpenGL/gl.h>
  #if defined(GLFW_INCLUDE_GLU)
   #include <OpenGL/glu.h>
  #endif

 #else /*__APPLE__*/

  #include <GL/gl.h>
  #if defined(GLFW_INCLUDE_GLEXT)
   #include <GL/glext.h>
  #endif
  #if defined(GLFW_INCLUDE_GLU)
   #include <GL/glu.h>
  #endif

 #endif /*__APPLE__*/

#endif /* OpenGL and OpenGL ES headers */

#if defined(GLFW_DLL) && defined(_GLFW_BUILD_DLL)
 /* GLFW_DLL must be defined by applications that are linking against the DLL
  * version of the GLFW library.  _GLFW_BUILD_DLL is defined by the GLFW
  * configuration header when compiling the DLL version of the library.
  */
 #error "You must not have both GLFW_DLL and _GLFW_BUILD_DLL defined"
#endif

/* GLFWAPI is used to declare public API functions for export
 * from the DLL / shared library / dynamic library.
 */
#if defined(_WIN32) && defined(_GLFW_BUILD_DLL)
 /* We are building GLFW as a Win32 DLL */
 #define GLFWAPI __declspec(dllexport)
#elif defined(_WIN32) && defined(GLFW_DLL)
 /* We are calling GLFW as a Win32 DLL */
 #define GLFWAPI __declspec(dllimport)
#elif defined(__GNUC__) && defined(_GLFW_BUILD_DLL)
 /* We are building GLFW as a shared / dynamic library */
 #define GLFWAPI __attribute__((visibility("default")))
#else
 /* We are building or calling GLFW as a static library */
 #define GLFWAPI
#endif


/*************************************************************************
 * GLFW API tokens
 *************************************************************************/

/*! @name GLFW version macros
 *  @{ */
/*! @brief The major version number of the GLFW library.
 *
 *  This is incremented when the API is changed in non-compatible ways.
 *  @ingroup init
 */
#define GLFW_VERSION_MAJOR          3
/*! @brief The minor version number of the GLFW library.
 *
 *  This is incremented when features are added to the API but it remains
 *  backward-compatible.
 *  @ingroup init
 */
#define GLFW_VERSION_MINOR          4
/*! @brief The revision number of the GLFW library.
 *
 *  This is incremented when a bug fix release is made that does not contain any
 *  API changes.
 *  @ingroup init
 */
#define GLFW_VERSION_REVISION       0
/*! @} */

/*! @brief One.
 *
 *  This is only semantic sugar for the number 1.  You can instead use `1` or
 *  `true` or `_True` or `GL_TRUE` or `VK_TRUE` or anything else that is equal
 *  to one.
 *
 *  @ingroup init
 */
#define GLFW_TRUE                   1
/*! @brief Zero.
 *
 *  This is only semantic sugar for the number 0.  You can instead use `0` or
 *  `false` or `_False` or `GL_FALSE` or `VK_FALSE` or anything else that is
 *  equal to zero.
 *
 *  @ingroup init
 */
#define GLFW_FALSE                  0

/*! @name Key and button actions
 *  @{ */
/*! @brief The key or mouse button was released.
 *
 *  The key or mouse button was released.
 *
 *  @ingroup input
 */
#define GLFW_RELEASE                0
/*! @brief The key or mouse button was pressed.
 *
 *  The key or mouse button was pressed.
 *
 *  @ingroup input
 */
#define GLFW_PRESS                  1
/*! @brief The key was held down until it repeated.
 *
 *  The key was held down until it repeated.
 *
 *  @ingroup input
 */
#define GLFW_REPEAT                 2
/*! @} */

/*! @defgroup hat_state Joystick hat states
 *  @brief Joystick hat states.
 *
 *  See [joystick hat input](@ref joystick_hat) for how these are used.
 *
 *  @ingroup input
 *  @{ */
#define GLFW_HAT_CENTERED           0
#define GLFW_HAT_UP                 1
#define GLFW_HAT_RIGHT              2
#define GLFW_HAT_DOWN               4
#define GLFW_HAT_LEFT               8
#define GLFW_HAT_RIGHT_UP           (GLFW_HAT_RIGHT | GLFW_HAT_UP)
#define GLFW_HAT_RIGHT_DOWN         (GLFW_HAT_RIGHT | GLFW_HAT_DOWN)
#define GLFW_HAT_LEFT_UP            (GLFW_HAT_LEFT  | GLFW_HAT_UP)
#define GLFW_HAT_LEFT_DOWN          (GLFW_HAT_LEFT  | GLFW_HAT_DOWN)
/*! @} */

/*! @defgroup keys Keyboard keys
 *  @brief Keyboard key IDs.
 *
 *  See [key input](@ref input_key) for how these are used.
 *
 *  These key codes are inspired by the _USB HID Usage Tables v1.12_ (p. 53-60),
 *  but re-arranged to map to 7-bit ASCII for printable keys (function keys are
 *  put in the 256+ range).
 *
 *  The naming of the key codes follow these rules:
 *   - The US keyboard layout is used
 *   - Names of printable alpha-numeric characters are used (e.g. "A", "R",
 *     "3", etc.)
 *   - For non-alphanumeric characters, Unicode:ish names are used (e.g.
 *     "COMMA", "LEFT_SQUARE_BRACKET", etc.). Note that some names do not
 *     correspond to the Unicode standard (usually for brevity)
 *   - Keys that lack a clear US mapping are named "WORLD_x"
 *   - For non-printable keys, custom names are used (e.g. "F4",
 *     "BACKSPACE", etc.)
 *
 *  @ingroup input
 *  @{
 */

/* The unknown key */
#define GLFW_KEY_UNKNOWN            -1

/* Printable keys */
#define GLFW_KEY_SPACE              32
#define GLFW_KEY_APOSTROPHE         39  /* ' */
#define GLFW_KEY_COMMA              44  /* , */
#define GLFW_KEY_MINUS              45  /* - */
#define GLFW_KEY_PERIOD             46  /* . */
#define GLFW_KEY_SLASH              47  /* / */
#define GLFW_KEY_0                  48
#define GLFW_KEY_1                  49
#define GLFW_KEY_2                  50
#define GLFW_KEY_3                  51
#define GLFW_KEY_4                  52
#define GLFW_KEY_5                  53
#define GLFW_KEY_6                  54
#define GLFW_KEY_7                  55
#define GLFW_KEY_8                  56
#define GLFW_KEY_9                  57
#define GLFW_KEY_SEMICOLON          59  /* ; */
#define GLFW_KEY_EQUAL              61  /* = */
#define GLFW_KEY_A                  65
#define GLFW_KEY_B                  66
#define GLFW_KEY_C                  67
#define GLFW_KEY_D                  68
#define GLFW_KEY_E                  69
#define GLFW_KEY_F                  70
#define GLFW_KEY_G                  71
#define GLFW_KEY_H                  72
#define GLFW_KEY_I                  73
#define GLFW_KEY_J                  74
#define GLFW_KEY_K                  75
#define GLFW_KEY_L                  76
#define GLFW_KEY_M                  77
#define GLFW_KEY_N                  78
#define GLFW_KEY_O                  79
#define GLFW_KEY_P                  80
#define GLFW_KEY_Q                  81
#define GLFW_KEY_R                  82
#define GLFW_KEY_S                  83
#define GLFW_KEY_T                  84
#define GLFW_KEY_U                  85
#define GLFW_KEY_V                  86
#define GLFW_KEY_W                  87
#define GLFW_KEY_X                  88
#define GLFW_KEY_Y                  89
#define GLFW_KEY_Z                  90
#define GLFW_KEY_LEFT_BRACKET       91  /* [ */
#define GLFW_KEY_BACKSLASH          92  /* \ */
#define GLFW_KEY_RIGHT_BRACKET      93  /* ] */
#define GLFW_KEY_GRAVE_ACCENT       96  /* ` */
#define GLFW_KEY_WORLD_1            161 /* non-US #1 */
#define GLFW_KEY_WORLD_2            162 /* non-US #2 */

/* Function keys */
#define GLFW_KEY_ESCAPE             256
#define GLFW_KEY_ENTER              257
#define GLFW_KEY_TAB                258
#define GLFW_KEY_BACKSPACE          259
#define GLFW_KEY_INSERT             260
#define GLFW_KEY_DELETE             261
#define GLFW_KEY_RIGHT              262
#define GLFW_KEY_LEFT               263
#define GLFW_KEY_DOWN               264
#define GLFW_KEY_UP                 265
#define GLFW_KEY_PAGE_UP            266
#define GLFW_KEY_PAGE_DOWN          267
#define GLFW_KEY_HOME               268
#define GLFW_KEY_END                269
#define GLFW_KEY_CAPS_LOCK          280
#define GLFW_KEY_SCROLL_LOCK        281
#define GLFW_KEY_NUM_LOCK           282
#define GLFW_KEY_PRINT_SCREEN       283
#define GLFW_KEY_PAUSE              284
#define GLFW_KEY_F1                 290
#define GLFW_KEY_F2                 291
#define GLFW_KEY_F3                 292
#define GLFW_KEY_F4                 293
#define GLFW_KEY_F5                 294
#define GLFW_KEY_F6                 295
#define GLFW_KEY_F7                 296
#define GLFW_KEY_F8                 297
#define GLFW_KEY_F9                 298
#define GLFW_KEY_F10                299
#define GLFW_KEY_F11                300
#define GLFW_KEY_F12                301
#define GLFW_KEY_F13                302
#define GLFW_KEY_F14                303
#define GLFW_KEY_F15                304
#define GLFW_KEY_F16                305
#define GLFW_KEY_F17                306
#define GLFW_KEY_F18                307
#define GLFW_KEY_F19                308
#define GLFW_KEY_F20                309
#define GLFW_KEY_F21                310
#define GLFW_KEY_F22                311
#define GLFW_KEY_F23                312
#define GLFW_KEY_F24                313
#define GLFW_KEY_F25                314
#define GLFW_KEY_KP_0               320
#define GLFW_KEY_KP_1               321
#define GLFW_KEY_KP_2               322
#define GLFW_KEY_KP_3               323
#define GLFW_KEY_KP_4               324
#define GLFW_KEY_KP_5               325
#define GLFW_KEY_KP_6               326
#define GLFW_KEY_KP_7               327
#define GLFW_KEY_KP_8               328
#define GLFW_KEY_KP_9               329
#define GLFW_KEY_KP_DECIMAL         330
#define GLFW_KEY_KP_DIVIDE          331
#define GLFW_KEY_KP_MULTIPLY        332
#define GLFW_KEY_KP_SUBTRACT        333
#define GLFW_KEY_KP_ADD             334
#define GLFW_KEY_KP_ENTER           335
#define GLFW_KEY_KP_EQUAL           336
#define GLFW_KEY_LEFT_SHIFT         340
#define GLFW_KEY_LEFT_CONTROL       341
#define GLFW_KEY_LEFT_ALT           342
#define GLFW_KEY_LEFT_SUPER         343
#define GLFW_KEY_RIGHT_SHIFT        344
#define GLFW_KEY_RIGHT_CONTROL      345
#define GLFW_KEY_RIGHT_ALT          346
#define GLFW_KEY_RIGHT_SUPER        347
#define GLFW_KEY_MENU               348

#define GLFW_KEY_LAST               GLFW_KEY_MENU

/*! @} */

/*! @defgroup mods Modifier key flags
 *  @brief Modifier key flags.
 *
 *  See [key input](@ref input_key) for how these are used.
 *
 *  @ingroup input
 *  @{ */

/*! @brief If this bit is set one or more Shift keys were held down.
 *
 *  If this bit is set one or more Shift keys were held down.
 */
#define GLFW_MOD_SHIFT           0x0001
/*! @brief If this bit is set one or more Control keys were held down.
 *
 *  If this bit is set one or more Control keys were held down.
 */
#define GLFW_MOD_CONTROL         0x0002
/*! @brief If this bit is set one or more Alt keys were held down.
 *
 *  If this bit is set one or more Alt keys were held down.
 */
#define GLFW_MOD_ALT             0x0004
/*! @brief If this bit is set one or more Super keys were held down.
 *
 *  If this bit is set one or more Super keys were held down.
 */
#define GLFW_MOD_SUPER           0x0008
/*! @brief If this bit is set the Caps Lock key is enabled.
 *
 *  If this bit is set the Caps Lock key is enabled and the @ref
 *  GLFW_LOCK_KEY_MODS input mode is set.
 */
#define GLFW_MOD_CAPS_LOCK       0x0010
/*! @brief If this bit is set the Num Lock key is enabled.
 *
 *  If this bit is set the Num Lock key is enabled and the @ref
 *  GLFW_LOCK_KEY_MODS input mode is set.
 */
#define GLFW_MOD_NUM_LOCK        0x0020

/*! @} */

/*! @defgroup buttons Mouse buttons
 *  @brief Mouse button IDs.
 *
 *  See [mouse button input](@ref input_mouse_button) for how these are used.
 *
 *  @ingroup input
 *  @{ */
#define GLFW_MOUSE_BUTTON_1         0
#define GLFW_MOUSE_BUTTON_2         1
#define GLFW_MOUSE_BUTTON_3         2
#define GLFW_MOUSE_BUTTON_4         3
#define GLFW_MOUSE_BUTTON_5         4
#define GLFW_MOUSE_BUTTON_6         5
#define GLFW_MOUSE_BUTTON_7         6
#define GLFW_MOUSE_BUTTON_8         7
#define GLFW_MOUSE_BUTTON_LAST      GLFW_MOUSE_BUTTON_8
#define GLFW_MOUSE_BUTTON_LEFT      GLFW_MOUSE_BUTTON_1
#define GLFW_MOUSE_BUTTON_RIGHT     GLFW_MOUSE_BUTTON_2
#define GLFW_MOUSE_BUTTON_MIDDLE    GLFW_MOUSE_BUTTON_3
/*! @} */

/*! @defgroup joysticks Joysticks
 *  @brief Joystick IDs.
 *
 *  See [joystick input](@ref joystick) for how these are used.
 *
 *  @ingroup input
 *  @{ */
#define GLFW_JOYSTICK_1             0
#define GLFW_JOYSTICK_2             1
#define GLFW_JOYSTICK_3             2
#define GLFW_JOYSTICK_4             3
#define GLFW_JOYSTICK_5             4
#define GLFW_JOYSTICK_6             5
#define GLFW_JOYSTICK_7             6
#define GLFW_JOYSTICK_8             7
#define GLFW_JOYSTICK_9             8
#define GLFW_JOYSTICK_10            9
#define GLFW_JOYSTICK_11            10
#define GLFW_JOYSTICK_12            11
#define GLFW_JOYSTICK_13            12
#define GLFW_JOYSTICK_14            13
#define GLFW_JOYSTICK_15            14
#define GLFW_JOYSTICK_16            15
#define GLFW_JOYSTICK_LAST          GLFW_JOYSTICK_16
/*! @} */

/*! @defgroup gamepad_buttons Gamepad buttons
 *  @brief Gamepad buttons.
 *
 *  See @ref gamepad for how these are used.
 *
 *  @ingroup input
 *  @{ */
#define GLFW_GAMEPAD_BUTTON_A               0
#define GLFW_GAMEPAD_BUTTON_B               1
#define GLFW_GAMEPAD_BUTTON_X               2
#define GLFW_GAMEPAD_BUTTON_Y               3
#define GLFW_GAMEPAD_BUTTON_LEFT_BUMPER     4
#define GLFW_GAMEPAD_BUTTON_RIGHT_BUMPER    5
#define GLFW_GAMEPAD_BUTTON_BACK            6
#define GLFW_GAMEPAD_BUTTON_START           7
#define GLFW_GAMEPAD_BUTTON_GUIDE           8
#define GLFW_GAMEPAD_BUTTON_LEFT_THUMB      9
#define GLFW_GAMEPAD_BUTTON_RIGHT_THUMB     10
#define GLFW_GAMEPAD_BUTTON_DPAD_UP         11
#define GLFW_GAMEPAD_BUTTON_DPAD_RIGHT      12
#define GLFW_GAMEPAD_BUTTON_DPAD_DOWN       13
#define GLFW_GAMEPAD_BUTTON_DPAD_LEFT       14
#define GLFW_GAMEPAD_BUTTON_LAST            GLFW_GAMEPAD_BUTTON_DPAD_LEFT

#define GLFW_GAMEPAD_BUTTON_CROSS       GLFW_GAMEPAD_BUTTON_A
#define GLFW_GAMEPAD_BUTTON_CIRCLE      GLFW_GAMEPAD_BUTTON_B
#define GLFW_GAMEPAD_BUTTON_SQUARE      GLFW_GAMEPAD_BUTTON_X
#define GLFW_GAMEPAD_BUTTON_TRIANGLE    GLFW_GAMEPAD_BUTTON_Y
/*! @} */

/*! @defgroup gamepad_axes Gamepad axes
 *  @brief Gamepad axes.
 *
 *  See @ref gamepad for how these are used.
 *
 *  @ingroup input
 *  @{ */
#define GLFW_GAMEPAD_AXIS_LEFT_X        0
#define GLFW_GAMEPAD_AXIS_LEFT_Y        1
#define GLFW_GAMEPAD_AXIS_RIGHT_X       2
#define GLFW_GAMEPAD_AXIS_RIGHT_Y       3
#define GLFW_GAMEPAD_AXIS_LEFT_TRIGGER  4
#define GLFW_GAMEPAD_AXIS_RIGHT_TRIGGER 5
#define GLFW_GAMEPAD_AXIS_LAST          GLFW_GAMEPAD_AXIS_RIGHT_TRIGGER
/*! @} */

/*! @defgroup errors Error codes
 *  @brief Error codes.
 *
 *  See [error handling](@ref error_handling) for how these are used.
 *
 *  @ingroup init
 *  @{ */
/*! @brief No error has occurred.
 *
 *  No error has occurred.
 *
 *  @analysis Yay.
 */
#define GLFW_NO_ERROR               0
/*! @brief GLFW has not been initialized.
 *
 *  This occurs if a GLFW function was called that must not be called unless the
 *  library is [initialized](@ref intro_init).
 *
 *  @analysis Application programmer error.  Initialize GLFW before calling any
 *  function that requires initialization.
 */
#define GLFW_NOT_INITIALIZED        0x00010001
/*! @brief No context is current for this thread.
 *
 *  This occurs if a GLFW function was called that needs and operates on the
 *  current OpenGL or OpenGL ES context but no context is current on the calling
 *  thread.  One such function is @ref glfwSwapInterval.
 *
 *  @analysis Application programmer error.  Ensure a context is current before
 *  calling functions that require a current context.
 */
#define GLFW_NO_CURRENT_CONTEXT     0x00010002
/*! @brief One of the arguments to the function was an invalid enum value.
 *
 *  One of the arguments to the function was an invalid enum value, for example
 *  requesting @ref GLFW_RED_BITS with @ref glfwGetWindowAttrib.
 *
 *  @analysis Application programmer error.  Fix the offending call.
 */
#define GLFW_INVALID_ENUM           0x00010003
/*! @brief One of the arguments to the function was an invalid value.
 *
 *  One of the arguments to the function was an invalid value, for example
 *  requesting a non-existent OpenGL or OpenGL ES version like 2.7.
 *
 *  Requesting a valid but unavailable OpenGL or OpenGL ES version will instead
 *  result in a @ref GLFW_VERSION_UNAVAILABLE error.
 *
 *  @analysis Application programmer error.  Fix the offending call.
 */
#define GLFW_INVALID_VALUE          0x00010004
/*! @brief A memory allocation failed.
 *
 *  A memory allocation failed.
 *
 *  @analysis A bug in GLFW or the underlying operating system.  Report the bug
 *  to our [issue tracker](https://github.com/glfw/glfw/issues).
 */
#define GLFW_OUT_OF_MEMORY          0x00010005
/*! @brief GLFW could not find support for the requested API on the system.
 *
 *  GLFW could not find support for the requested API on the system.
 *
 *  @analysis The installed graphics driver does not support the requested
 *  API, or does not support it via the chosen context creation backend.
 *  Below are a few examples.
 *
 *  @par
 *  Some pre-installed Windows graphics drivers do not support OpenGL.  AMD only
 *  supports OpenGL ES via EGL, while Nvidia and Intel only support it via
 *  a WGL or GLX extension.  macOS does not provide OpenGL ES at all.  The Mesa
 *  EGL, OpenGL and OpenGL ES libraries do not interface with the Nvidia binary
 *  driver.  Older graphics drivers do not support Vulkan.
 */
#define GLFW_API_UNAVAILABLE        0x00010006
/*! @brief The requested OpenGL or OpenGL ES version is not available.
 *
 *  The requested OpenGL or OpenGL ES version (including any requested context
 *  or framebuffer hints) is not available on this machine.
 *
 *  @analysis The machine does not support your requirements.  If your
 *  application is sufficiently flexible, downgrade your requirements and try
 *  again.  Otherwise, inform the user that their machine does not match your
 *  requirements.
 *
 *  @par
 *  Future invalid OpenGL and OpenGL ES versions, for example OpenGL 4.8 if 5.0
 *  comes out before the 4.x series gets that far, also fail with this error and
 *  not @ref GLFW_INVALID_VALUE, because GLFW cannot know what future versions
 *  will exist.
 */
#define GLFW_VERSION_UNAVAILABLE    0x00010007
/*! @brief A platform-specific error occurred that does not match any of the
 *  more specific categories.
 *
 *  A platform-specific error occurred that does not match any of the more
 *  specific categories.
 *
 *  @analysis A bug or configuration error in GLFW, the underlying operating
 *  system or its drivers, or a lack of required resources.  Report the issue to
 *  our [issue tracker](https://github.com/glfw/glfw/issues).
 */
#define GLFW_PLATFORM_ERROR         0x00010008
/*! @brief The requested format is not supported or available.
 *
 *  If emitted during window creation, the requested pixel format is not
 *  supported.
 *
 *  If emitted when querying the clipboard, the contents of the clipboard could
 *  not be converted to the requested format.
 *
 *  @analysis If emitted during window creation, one or more
 *  [hard constraints](@ref window_hints_hard) did not match any of the
 *  available pixel formats.  If your application is sufficiently flexible,
 *  downgrade your requirements and try again.  Otherwise, inform the user that
 *  their machine does not match your requirements.
 *
 *  @par
 *  If emitted when querying the clipboard, ignore the error or report it to
 *  the user, as appropriate.
 */
#define GLFW_FORMAT_UNAVAILABLE     0x00010009
/*! @brief The specified window does not have an OpenGL or OpenGL ES context.
 *
 *  A window that does not have an OpenGL or OpenGL ES context was passed to
 *  a function that requires it to have one.
 *
 *  @analysis Application programmer error.  Fix the offending call.
 */
#define GLFW_NO_WINDOW_CONTEXT      0x0001000A
/*! @brief The specified cursor shape is not available.
 *
 *  The specified standard cursor shape is not available, either because the
 *  current system cursor theme does not provide it or because it is not
 *  available on the platform.
 *
 *  @analysis Platform or system settings limitation.  Pick another
 *  [standard cursor shape](@ref shapes) or create a
 *  [custom cursor](@ref cursor_custom).
 */
#define GLFW_CURSOR_UNAVAILABLE     0x0001000B
/*! @} */

/*! @addtogroup window
 *  @{ */
/*! @brief Input focus window hint and attribute
 *
 *  Input focus [window hint](@ref GLFW_FOCUSED_hint) or
 *  [window attribute](@ref GLFW_FOCUSED_attrib).
 */
#define GLFW_FOCUSED                0x00020001
/*! @brief Window iconification window attribute
 *
 *  Window iconification [window attribute](@ref GLFW_ICONIFIED_attrib).
 */
#define GLFW_ICONIFIED              0x00020002
/*! @brief Window resize-ability window hint and attribute
 *
 *  Window resize-ability [window hint](@ref GLFW_RESIZABLE_hint) and
 *  [window attribute](@ref GLFW_RESIZABLE_attrib).
 */
#define GLFW_RESIZABLE              0x00020003
/*! @brief Window visibility window hint and attribute
 *
 *  Window visibility [window hint](@ref GLFW_VISIBLE_hint) and
 *  [window attribute](@ref GLFW_VISIBLE_attrib).
 */
#define GLFW_VISIBLE                0x00020004
/*! @brief Window decoration window hint and attribute
 *
 *  Window decoration [window hint](@ref GLFW_DECORATED_hint) and
 *  [window attribute](@ref GLFW_DECORATED_attrib).
 */
#define GLFW_DECORATED              0x00020005
/*! @brief Window auto-iconification window hint and attribute
 *
 *  Window auto-iconification [window hint](@ref GLFW_AUTO_ICONIFY_hint) and
 *  [window attribute](@ref GLFW_AUTO_ICONIFY_attrib).
 */
#define GLFW_AUTO_ICONIFY           0x00020006
/*! @brief Window decoration window hint and attribute
 *
 *  Window decoration [window hint](@ref GLFW_FLOATING_hint) and
 *  [window attribute](@ref GLFW_FLOATING_attrib).
 */
#define GLFW_FLOATING               0x00020007
/*! @brief Window maximization window hint and attribute
 *
 *  Window maximization [window hint](@ref GLFW_MAXIMIZED_hint) and
 *  [window attribute](@ref GLFW_MAXIMIZED_attrib).
 */
#define GLFW_MAXIMIZED              0x00020008
/*! @brief Cursor centering window hint
 *
 *  Cursor centering [window hint](@ref GLFW_CENTER_CURSOR_hint).
 */
#define GLFW_CENTER_CURSOR          0x00020009
/*! @brief Window framebuffer transparency hint and attribute
 *
 *  Window framebuffer transparency
 *  [window hint](@ref GLFW_TRANSPARENT_FRAMEBUFFER_hint) and
 *  [window attribute](@ref GLFW_TRANSPARENT_FRAMEBUFFER_attrib).
 */
#define GLFW_TRANSPARENT_FRAMEBUFFER 0x0002000A
/*! @brief Mouse cursor hover window attribute.
 *
 *  Mouse cursor hover [window attribute](@ref GLFW_HOVERED_attrib).
 */
#define GLFW_HOVERED                0x0002000B
/*! @brief Input focus on calling show window hint and attribute
 *
 *  Input focus [window hint](@ref GLFW_FOCUS_ON_SHOW_hint) or
 *  [window attribute](@ref GLFW_FOCUS_ON_SHOW_attrib).
 */
#define GLFW_FOCUS_ON_SHOW          0x0002000C

/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_RED_BITS).
 */
#define GLFW_RED_BITS               0x00021001
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_GREEN_BITS).
 */
#define GLFW_GREEN_BITS             0x00021002
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_BLUE_BITS).
 */
#define GLFW_BLUE_BITS              0x00021003
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_ALPHA_BITS).
 */
#define GLFW_ALPHA_BITS             0x00021004
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_DEPTH_BITS).
 */
#define GLFW_DEPTH_BITS             0x00021005
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_STENCIL_BITS).
 */
#define GLFW_STENCIL_BITS           0x00021006
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_ACCUM_RED_BITS).
 */
#define GLFW_ACCUM_RED_BITS         0x00021007
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_ACCUM_GREEN_BITS).
 */
#define GLFW_ACCUM_GREEN_BITS       0x00021008
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_ACCUM_BLUE_BITS).
 */
#define GLFW_ACCUM_BLUE_BITS        0x00021009
/*! @brief Framebuffer bit depth hint.
 *
 *  Framebuffer bit depth [hint](@ref GLFW_ACCUM_ALPHA_BITS).
 */
#define GLFW_ACCUM_ALPHA_BITS       0x0002100A
/*! @brief Framebuffer auxiliary buffer hint.
 *
 *  Framebuffer auxiliary buffer [hint](@ref GLFW_AUX_BUFFERS).
 */
#define GLFW_AUX_BUFFERS            0x0002100B
/*! @brief OpenGL stereoscopic rendering hint.
 *
 *  OpenGL stereoscopic rendering [hint](@ref GLFW_STEREO).
 */
#define GLFW_STEREO                 0x0002100C
/*! @brief Framebuffer MSAA samples hint.
 *
 *  Framebuffer MSAA samples [hint](@ref GLFW_SAMPLES).
 */
#define GLFW_SAMPLES                0x0002100D
/*! @brief Framebuffer sRGB hint.
 *
 *  Framebuffer sRGB [hint](@ref GLFW_SRGB_CAPABLE).
 */
#define GLFW_SRGB_CAPABLE           0x0002100E
/*! @brief Monitor refresh rate hint.
 *
 *  Monitor refresh rate [hint](@ref GLFW_REFRESH_RATE).
 */
#define GLFW_REFRESH_RATE           0x0002100F
/*! @brief Framebuffer double buffering hint.
 *
 *  Framebuffer double buffering [hint](@ref GLFW_DOUBLEBUFFER).
 */
#define GLFW_DOUBLEBUFFER           0x00021010

/*! @brief Context client API hint and attribute.
 *
 *  Context client API [hint](@ref GLFW_CLIENT_API_hint) and
 *  [attribute](@ref GLFW_CLIENT_API_attrib).
 */
#define GLFW_CLIENT_API             0x00022001
/*! @brief Context client API major version hint and attribute.
 *
 *  Context client API major version [hint](@ref GLFW_CONTEXT_VERSION_MAJOR_hint)
 *  and [attribute](@ref GLFW_CONTEXT_VERSION_MAJOR_attrib).
 */
#define GLFW_CONTEXT_VERSION_MAJOR  0x00022002
/*! @brief Context client API minor version hint and attribute.
 *
 *  Context client API minor version [hint](@ref GLFW_CONTEXT_VERSION_MINOR_hint)
 *  and [attribute](@ref GLFW_CONTEXT_VERSION_MINOR_attrib).
 */
#define GLFW_CONTEXT_VERSION_MINOR  0x00022003
/*! @brief Context client API revision number hint and attribute.
 *
 *  Context client API revision number
 *  [attribute](@ref GLFW_CONTEXT_REVISION_attrib).
 */
#define GLFW_CONTEXT_REVISION       0x00022004
/*! @brief Context robustness hint and attribute.
 *
 *  Context client API revision number [hint](@ref GLFW_CONTEXT_ROBUSTNESS_hint)
 *  and [attribute](@ref GLFW_CONTEXT_ROBUSTNESS_attrib).
 */
#define GLFW_CONTEXT_ROBUSTNESS     0x00022005
/*! @brief OpenGL forward-compatibility hint and attribute.
 *
 *  OpenGL forward-compatibility [hint](@ref GLFW_OPENGL_FORWARD_COMPAT_hint)
 *  and [attribute](@ref GLFW_OPENGL_FORWARD_COMPAT_attrib).
 */
#define GLFW_OPENGL_FORWARD_COMPAT  0x00022006
/*! @brief OpenGL debug context hint and attribute.
 *
 *  OpenGL debug context [hint](@ref GLFW_OPENGL_DEBUG_CONTEXT_hint) and
 *  [attribute](@ref GLFW_OPENGL_DEBUG_CONTEXT_attrib).
 */
#define GLFW_OPENGL_DEBUG_CONTEXT   0x00022007
/*! @brief OpenGL profile hint and attribute.
 *
 *  OpenGL profile [hint](@ref GLFW_OPENGL_PROFILE_hint) and
 *  [attribute](@ref GLFW_OPENGL_PROFILE_attrib).
 */
#define GLFW_OPENGL_PROFILE         0x00022008
/*! @brief Context flush-on-release hint and attribute.
 *
 *  Context flush-on-release [hint](@ref GLFW_CONTEXT_RELEASE_BEHAVIOR_hint) and
 *  [attribute](@ref GLFW_CONTEXT_RELEASE_BEHAVIOR_attrib).
 */
#define GLFW_CONTEXT_RELEASE_BEHAVIOR 0x00022009
/*! @brief Context error suppression hint and attribute.
 *
 *  Context error suppression [hint](@ref GLFW_CONTEXT_NO_ERROR_hint) and
 *  [attribute](@ref GLFW_CONTEXT_NO_ERROR_attrib).
 */
#define GLFW_CONTEXT_NO_ERROR       0x0002200A
/*! @brief Context creation API hint and attribute.
 *
 *  Context creation API [hint](@ref GLFW_CONTEXT_CREATION_API_hint) and
 *  [attribute](@ref GLFW_CONTEXT_CREATION_API_attrib).
 */
#define GLFW_CONTEXT_CREATION_API   0x0002200B
/*! @brief Window content area scaling window
 *  [window hint](@ref GLFW_SCALE_TO_MONITOR).
 */
#define GLFW_SCALE_TO_MONITOR       0x0002200C
/*! @brief macOS specific
 *  [window hint](@ref GLFW_COCOA_RETINA_FRAMEBUFFER_hint).
 */
#define GLFW_COCOA_RETINA_FRAMEBUFFER 0x00023001
/*! @brief macOS specific
 *  [window hint](@ref GLFW_COCOA_FRAME_NAME_hint).
 */
#define GLFW_COCOA_FRAME_NAME         0x00023002
/*! @brief macOS specific
 *  [window hint](@ref GLFW_COCOA_GRAPHICS_SWITCHING_hint).
 */
#define GLFW_COCOA_GRAPHICS_SWITCHING 0x00023003
/*! @brief X11 specific
 *  [window hint](@ref GLFW_X11_CLASS_NAME_hint).
 */
#define GLFW_X11_CLASS_NAME         0x00024001
/*! @brief X11 specific
 *  [window hint](@ref GLFW_X11_CLASS_NAME_hint).
 */
#define GLFW_X11_INSTANCE_NAME      0x00024002
#define GLFW_WIN32_KEYBOARD_MENU    0x00025001
/*! @} */

#define GLFW_NO_API                          0
#define GLFW_OPENGL_API             0x00030001
#define GLFW_OPENGL_ES_API          0x00030002

#define GLFW_NO_ROBUSTNESS                   0
#define GLFW_NO_RESET_NOTIFICATION  0x00031001
#define GLFW_LOSE_CONTEXT_ON_RESET  0x00031002

#define GLFW_OPENGL_ANY_PROFILE              0
#define GLFW_OPENGL_CORE_PROFILE    0x00032001
#define GLFW_OPENGL_COMPAT_PROFILE  0x00032002

#define GLFW_CURSOR                 0x00033001
#define GLFW_STICKY_KEYS            0x00033002
#define GLFW_STICKY_MOUSE_BUTTONS   0x00033003
#define GLFW_LOCK_KEY_MODS          0x00033004
#define GLFW_RAW_MOUSE_MOTION       0x00033005

#define GLFW_CURSOR_NORMAL          0x00034001
#define GLFW_CURSOR_HIDDEN          0x00034002
#define GLFW_CURSOR_DISABLED        0x00034003

#define GLFW_ANY_RELEASE_BEHAVIOR            0
#define GLFW_RELEASE_BEHAVIOR_FLUSH 0x00035001
#define GLFW_RELEASE_BEHAVIOR_NONE  0x00035002

#define GLFW_NATIVE_CONTEXT_API     0x00036001
#define GLFW_EGL_CONTEXT_API        0x00036002
#define GLFW_OSMESA_CONTEXT_API     0x00036003

/*! @defgroup shapes Standard cursor shapes
 *  @brief Standard system cursor shapes.
 *
 *  These are the [standard cursor shapes](@ref cursor_standard) that can be
 *  requested from the window system.
 *
 *  @ingroup input
 *  @{ */

/*! @brief The regular arrow cursor shape.
 *
 *  The regular arrow cursor shape.
 */
#define GLFW_ARROW_CURSOR           0x00036001
/*! @brief The text input I-beam cursor shape.
 *
 *  The text input I-beam cursor shape.
 */
#define GLFW_IBEAM_CURSOR           0x00036002
/*! @brief The crosshair cursor shape.
 *
 *  The crosshair cursor shape.
 */
#define GLFW_CROSSHAIR_CURSOR       0x00036003
/*! @brief The pointing hand cursor shape.
 *
 *  The pointing hand cursor shape.
 */
#define GLFW_POINTING_HAND_CURSOR   0x00036004
/*! @brief The horizontal resize/move arrow shape.
 *
 *  The horizontal resize/move arrow shape.  This is usually a horizontal
 *  double-headed arrow.
 */
#define GLFW_RESIZE_EW_CURSOR       0x00036005
/*! @brief The vertical resize/move arrow shape.
 *
 *  The vertical resize/move shape.  This is usually a vertical double-headed
 *  arrow.
 */
#define GLFW_RESIZE_NS_CURSOR       0x00036006
/*! @brief The top-left to bottom-right diagonal resize/move arrow shape.
 *
 *  The top-left to bottom-right diagonal resize/move shape.  This is usually
 *  a diagonal double-headed arrow.
 *
 *  @note @macos This shape is provided by a private system API and may fail
 *  with @ref GLFW_CURSOR_UNAVAILABLE in the future.
 *
 *  @note @x11 This shape is provided by a newer standard not supported by all
 *  cursor themes.
 *
 *  @note @wayland This shape is provided by a newer standard not supported by
 *  all cursor themes.
 */
#define GLFW_RESIZE_NWSE_CURSOR     0x00036007
/*! @brief The top-right to bottom-left diagonal resize/move arrow shape.
 *
 *  The top-right to bottom-left diagonal resize/move shape.  This is usually
 *  a diagonal double-headed arrow.
 *
 *  @note @macos This shape is provided by a private system API and may fail
 *  with @ref GLFW_CURSOR_UNAVAILABLE in the future.
 *
 *  @note @x11 This shape is provided by a newer standard not supported by all
 *  cursor themes.
 *
 *  @note @wayland This shape is provided by a newer standard not supported by
 *  all cursor themes.
 */
#define GLFW_RESIZE_NESW_CURSOR     0x00036008
/*! @brief The omni-directional resize/move cursor shape.
 *
 *  The omni-directional resize cursor/move shape.  This is usually either
 *  a combined horizontal and vertical double-headed arrow or a grabbing hand.
 */
#define GLFW_RESIZE_ALL_CURSOR      0x00036009
/*! @brief The operation-not-allowed shape.
 *
 *  The operation-not-allowed shape.  This is usually a circle with a diagonal
 *  line through it.
 *
 *  @note @x11 This shape is provided by a newer standard not supported by all
 *  cursor themes.
 *
 *  @note @wayland This shape is provided by a newer standard not supported by
 *  all cursor themes.
 */
#define GLFW_NOT_ALLOWED_CURSOR     0x0003600A
/*! @brief Legacy name for compatibility.
 *
 *  This is an alias for compatibility with earlier versions.
 */
#define GLFW_HRESIZE_CURSOR         GLFW_RESIZE_EW_CURSOR
/*! @brief Legacy name for compatibility.
 *
 *  This is an alias for compatibility with earlier versions.
 */
#define GLFW_VRESIZE_CURSOR         GLFW_RESIZE_NS_CURSOR
/*! @brief Legacy name for compatibility.
 *
 *  This is an alias for compatibility with earlier versions.
 */
#define GLFW_HAND_CURSOR            GLFW_POINTING_HAND_CURSOR
/*! @} */

#define GLFW_CONNECTED              0x00040001
#define GLFW_DISCONNECTED           0x00040002

/*! @addtogroup init
 *  @{ */
/*! @brief Joystick hat buttons init hint.
 *
 *  Joystick hat buttons [init hint](@ref GLFW_JOYSTICK_HAT_BUTTONS).
 */
#define GLFW_JOYSTICK_HAT_BUTTONS   0x00050001
/*! @brief macOS specific init hint.
 *
 *  macOS specific [init hint](@ref GLFW_COCOA_CHDIR_RESOURCES_hint).
 */
#define GLFW_COCOA_CHDIR_RESOURCES  0x00051001
/*! @brief macOS specific init hint.
 *
 *  macOS specific [init hint](@ref GLFW_COCOA_MENUBAR_hint).
 */
#define GLFW_COCOA_MENUBAR          0x00051002
/*! @} */

#define GLFW_DONT_CARE              -1


/*************************************************************************
 * GLFW API types
 *************************************************************************/

/*! @brief Client API function pointer type.
 *
 *  Generic function pointer used for returning client API function pointers
 *  without forcing a cast from a regular pointer.
 *
 *  @sa @ref context_glext
 *  @sa @ref glfwGetProcAddress
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup context
 */
typedef void (*GLFWglproc)(void);

/*! @brief Vulkan API function pointer type.
 *
 *  Generic function pointer used for returning Vulkan API function pointers
 *  without forcing a cast from a regular pointer.
 *
 *  @sa @ref vulkan_proc
 *  @sa @ref glfwGetInstanceProcAddress
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup vulkan
 */
typedef void (*GLFWvkproc)(void);

/*! @brief Opaque monitor object.
 *
 *  Opaque monitor object.
 *
 *  @see @ref monitor_object
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
typedef struct GLFWmonitor GLFWmonitor;

/*! @brief Opaque window object.
 *
 *  Opaque window object.
 *
 *  @see @ref window_object
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
typedef struct GLFWwindow GLFWwindow;

/*! @brief Opaque cursor object.
 *
 *  Opaque cursor object.
 *
 *  @see @ref cursor_object
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
typedef struct GLFWcursor GLFWcursor;

/*! @brief The function pointer type for error callbacks.
 *
 *  This is the function pointer type for error callbacks.  An error callback
 *  function has the following signature:
 *  @code
 *  void callback_name(int error_code, const char* description)
 *  @endcode
 *
 *  @param[in] error_code An [error code](@ref errors).  Future releases may add
 *  more error codes.
 *  @param[in] description A UTF-8 encoded string describing the error.
 *
 *  @pointer_lifetime The error description string is valid until the callback
 *  function returns.
 *
 *  @sa @ref error_handling
 *  @sa @ref glfwSetErrorCallback
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup init
 */
typedef void (* GLFWerrorfun)(int,const char*);

/*! @brief The function pointer type for keyboard layout callbacks.
 *
 *  This is the function pointer type for keyboard layout callbacks.  A keyboard
 *  layout callback function has the following signature:
 *  @code
 *  void callback_name(void);
 *  @endcode
 *
 *  @sa @ref keyboard_layout
 *  @sa @ref glfwSetKeyboardLayoutCallback
 *
 *  @since Added in version 3.4.
 *
 *  @ingroup input
 */
typedef void (* GLFWkeyboardlayoutfun)(void);

/*! @brief The function pointer type for window position callbacks.
 *
 *  This is the function pointer type for window position callbacks.  A window
 *  position callback function has the following signature:
 *  @code
 *  void callback_name(GLFWwindow* window, int xpos, int ypos)
 *  @endcode
 *
 *  @param[in] window The window that was moved.
 *  @param[in] xpos The new x-coordinate, in screen coordinates, of the
 *  upper-left corner of the content area of the window.
 *  @param[in] ypos The new y-coordinate, in screen coordinates, of the
 *  upper-left corner of the content area of the window.
 *
 *  @sa @ref window_pos
 *  @sa @ref glfwSetWindowPosCallback
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
typedef void (* GLFWwindowposfun)(GLFWwindow*,int,int);

/*! @brief The function pointer type for window size callbacks.
 *
 *  This is the function pointer type for window size callbacks.  A window size
 *  callback function has the following signature:
 *  @code
 *  void callback_name(GLFWwindow* window, int width, int height)
 *  @endcode
 *
 *  @param[in] window The window that was resized.
 *  @param[in] width The new width, in screen coordinates, of the window.
 *  @param[in] height The new height, in screen coordinates, of the window.
 *
 *  @sa @ref window_size
 *  @sa @ref glfwSetWindowSizeCallback
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
typedef void (* GLFWwindowsizefun)(GLFWwindow*,int,int);

/*! @brief The function pointer type for window close callbacks.
 *
 *  This is the function pointer type for window close callbacks.  A window
 *  close callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window)
 *  @endcode
 *
 *  @param[in] window The window that the user attempted to close.
 *
 *  @sa @ref window_close
 *  @sa @ref glfwSetWindowCloseCallback
 *
 *  @since Added in version 2.5.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
typedef void (* GLFWwindowclosefun)(GLFWwindow*);

/*! @brief The function pointer type for window content refresh callbacks.
 *
 *  This is the function pointer type for window content refresh callbacks.
 *  A window content refresh callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window);
 *  @endcode
 *
 *  @param[in] window The window whose content needs to be refreshed.
 *
 *  @sa @ref window_refresh
 *  @sa @ref glfwSetWindowRefreshCallback
 *
 *  @since Added in version 2.5.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
typedef void (* GLFWwindowrefreshfun)(GLFWwindow*);

/*! @brief The function pointer type for window focus callbacks.
 *
 *  This is the function pointer type for window focus callbacks.  A window
 *  focus callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, int focused)
 *  @endcode
 *
 *  @param[in] window The window that gained or lost input focus.
 *  @param[in] focused `GLFW_TRUE` if the window was given input focus, or
 *  `GLFW_FALSE` if it lost it.
 *
 *  @sa @ref window_focus
 *  @sa @ref glfwSetWindowFocusCallback
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
typedef void (* GLFWwindowfocusfun)(GLFWwindow*,int);

/*! @brief The function pointer type for window iconify callbacks.
 *
 *  This is the function pointer type for window iconify callbacks.  A window
 *  iconify callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, int iconified)
 *  @endcode
 *
 *  @param[in] window The window that was iconified or restored.
 *  @param[in] iconified `GLFW_TRUE` if the window was iconified, or
 *  `GLFW_FALSE` if it was restored.
 *
 *  @sa @ref window_iconify
 *  @sa @ref glfwSetWindowIconifyCallback
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
typedef void (* GLFWwindowiconifyfun)(GLFWwindow*,int);

/*! @brief The function pointer type for window maximize callbacks.
 *
 *  This is the function pointer type for window maximize callbacks.  A window
 *  maximize callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, int maximized)
 *  @endcode
 *
 *  @param[in] window The window that was maximized or restored.
 *  @param[in] iconified `GLFW_TRUE` if the window was maximized, or
 *  `GLFW_FALSE` if it was restored.
 *
 *  @sa @ref window_maximize
 *  @sa glfwSetWindowMaximizeCallback
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
typedef void (* GLFWwindowmaximizefun)(GLFWwindow*,int);

/*! @brief The function pointer type for framebuffer size callbacks.
 *
 *  This is the function pointer type for framebuffer size callbacks.
 *  A framebuffer size callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, int width, int height)
 *  @endcode
 *
 *  @param[in] window The window whose framebuffer was resized.
 *  @param[in] width The new width, in pixels, of the framebuffer.
 *  @param[in] height The new height, in pixels, of the framebuffer.
 *
 *  @sa @ref window_fbsize
 *  @sa @ref glfwSetFramebufferSizeCallback
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
typedef void (* GLFWframebuffersizefun)(GLFWwindow*,int,int);

/*! @brief The function pointer type for window content scale callbacks.
 *
 *  This is the function pointer type for window content scale callbacks.
 *  A window content scale callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, float xscale, float yscale)
 *  @endcode
 *
 *  @param[in] window The window whose content scale changed.
 *  @param[in] xscale The new x-axis content scale of the window.
 *  @param[in] yscale The new y-axis content scale of the window.
 *
 *  @sa @ref window_scale
 *  @sa @ref glfwSetWindowContentScaleCallback
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
typedef void (* GLFWwindowcontentscalefun)(GLFWwindow*,float,float);

/*! @brief The function pointer type for mouse button callbacks.
 *
 *  This is the function pointer type for mouse button callback functions.
 *  A mouse button callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, int button, int action, int mods)
 *  @endcode
 *
 *  @param[in] window The window that received the event.
 *  @param[in] button The [mouse button](@ref buttons) that was pressed or
 *  released.
 *  @param[in] action One of `GLFW_PRESS` or `GLFW_RELEASE`.  Future releases
 *  may add more actions.
 *  @param[in] mods Bit field describing which [modifier keys](@ref mods) were
 *  held down.
 *
 *  @sa @ref input_mouse_button
 *  @sa @ref glfwSetMouseButtonCallback
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle and modifier mask parameters.
 *
 *  @ingroup input
 */
typedef void (* GLFWmousebuttonfun)(GLFWwindow*,int,int,int);

/*! @brief The function pointer type for cursor position callbacks.
 *
 *  This is the function pointer type for cursor position callbacks.  A cursor
 *  position callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, double xpos, double ypos);
 *  @endcode
 *
 *  @param[in] window The window that received the event.
 *  @param[in] xpos The new cursor x-coordinate, relative to the left edge of
 *  the content area.
 *  @param[in] ypos The new cursor y-coordinate, relative to the top edge of the
 *  content area.
 *
 *  @sa @ref cursor_pos
 *  @sa @ref glfwSetCursorPosCallback
 *
 *  @since Added in version 3.0.  Replaces `GLFWmouseposfun`.
 *
 *  @ingroup input
 */
typedef void (* GLFWcursorposfun)(GLFWwindow*,double,double);

/*! @brief The function pointer type for cursor enter/leave callbacks.
 *
 *  This is the function pointer type for cursor enter/leave callbacks.
 *  A cursor enter/leave callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, int entered)
 *  @endcode
 *
 *  @param[in] window The window that received the event.
 *  @param[in] entered `GLFW_TRUE` if the cursor entered the window's content
 *  area, or `GLFW_FALSE` if it left it.
 *
 *  @sa @ref cursor_enter
 *  @sa @ref glfwSetCursorEnterCallback
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup input
 */
typedef void (* GLFWcursorenterfun)(GLFWwindow*,int);

/*! @brief The function pointer type for scroll callbacks.
 *
 *  This is the function pointer type for scroll callbacks.  A scroll callback
 *  function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, double xoffset, double yoffset)
 *  @endcode
 *
 *  @param[in] window The window that received the event.
 *  @param[in] xoffset The scroll offset along the x-axis.
 *  @param[in] yoffset The scroll offset along the y-axis.
 *
 *  @sa @ref scrolling
 *  @sa @ref glfwSetScrollCallback
 *
 *  @since Added in version 3.0.  Replaces `GLFWmousewheelfun`.
 *
 *  @ingroup input
 */
typedef void (* GLFWscrollfun)(GLFWwindow*,double,double);

/*! @brief The function pointer type for keyboard key callbacks.
 *
 *  This is the function pointer type for keyboard key callbacks.  A keyboard
 *  key callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, int key, int scancode, int action, int mods)
 *  @endcode
 *
 *  @param[in] window The window that received the event.
 *  @param[in] key The [keyboard key](@ref keys) that was pressed or released.
 *  @param[in] scancode The system-specific scancode of the key.
 *  @param[in] action `GLFW_PRESS`, `GLFW_RELEASE` or `GLFW_REPEAT`.  Future
 *  releases may add more actions.
 *  @param[in] mods Bit field describing which [modifier keys](@ref mods) were
 *  held down.
 *
 *  @sa @ref input_key
 *  @sa @ref glfwSetKeyCallback
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle, scancode and modifier mask parameters.
 *
 *  @ingroup input
 */
typedef void (* GLFWkeyfun)(GLFWwindow*,int,int,int,int);

/*! @brief The function pointer type for Unicode character callbacks.
 *
 *  This is the function pointer type for Unicode character callbacks.
 *  A Unicode character callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, unsigned int codepoint)
 *  @endcode
 *
 *  @param[in] window The window that received the event.
 *  @param[in] codepoint The Unicode code point of the character.
 *
 *  @sa @ref input_char
 *  @sa @ref glfwSetCharCallback
 *
 *  @since Added in version 2.4.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup input
 */
typedef void (* GLFWcharfun)(GLFWwindow*,unsigned int);

/*! @brief The function pointer type for Unicode character with modifiers
 *  callbacks.
 *
 *  This is the function pointer type for Unicode character with modifiers
 *  callbacks.  It is called for each input character, regardless of what
 *  modifier keys are held down.  A Unicode character with modifiers callback
 *  function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, unsigned int codepoint, int mods)
 *  @endcode
 *
 *  @param[in] window The window that received the event.
 *  @param[in] codepoint The Unicode code point of the character.
 *  @param[in] mods Bit field describing which [modifier keys](@ref mods) were
 *  held down.
 *
 *  @sa @ref input_char
 *  @sa @ref glfwSetCharModsCallback
 *
 *  @deprecated Scheduled for removal in version 4.0.
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
typedef void (* GLFWcharmodsfun)(GLFWwindow*,unsigned int,int);

/*! @brief The function pointer type for path drop callbacks.
 *
 *  This is the function pointer type for path drop callbacks.  A path drop
 *  callback function has the following signature:
 *  @code
 *  void function_name(GLFWwindow* window, int path_count, const char* paths[])
 *  @endcode
 *
 *  @param[in] window The window that received the event.
 *  @param[in] path_count The number of dropped paths.
 *  @param[in] paths The UTF-8 encoded file and/or directory path names.
 *
 *  @pointer_lifetime The path array and its strings are valid until the
 *  callback function returns.
 *
 *  @sa @ref path_drop
 *  @sa @ref glfwSetDropCallback
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
typedef void (* GLFWdropfun)(GLFWwindow*,int,const char*[]);

/*! @brief The function pointer type for monitor configuration callbacks.
 *
 *  This is the function pointer type for monitor configuration callbacks.
 *  A monitor callback function has the following signature:
 *  @code
 *  void function_name(GLFWmonitor* monitor, int event)
 *  @endcode
 *
 *  @param[in] monitor The monitor that was connected or disconnected.
 *  @param[in] event One of `GLFW_CONNECTED` or `GLFW_DISCONNECTED`.  Future
 *  releases may add more events.
 *
 *  @sa @ref monitor_event
 *  @sa @ref glfwSetMonitorCallback
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
typedef void (* GLFWmonitorfun)(GLFWmonitor*,int);

/*! @brief The function pointer type for joystick configuration callbacks.
 *
 *  This is the function pointer type for joystick configuration callbacks.
 *  A joystick configuration callback function has the following signature:
 *  @code
 *  void function_name(int jid, int event)
 *  @endcode
 *
 *  @param[in] jid The joystick that was connected or disconnected.
 *  @param[in] event One of `GLFW_CONNECTED` or `GLFW_DISCONNECTED`.  Future
 *  releases may add more events.
 *
 *  @sa @ref joystick_event
 *  @sa @ref glfwSetJoystickCallback
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup input
 */
typedef void (* GLFWjoystickfun)(int,int);

/*! @brief Video mode type.
 *
 *  This describes a single video mode.
 *
 *  @sa @ref monitor_modes
 *  @sa @ref glfwGetVideoMode
 *  @sa @ref glfwGetVideoModes
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added refresh rate member.
 *
 *  @ingroup monitor
 */
typedef struct GLFWvidmode
{
    /*! The width, in screen coordinates, of the video mode.
     */
    int width;
    /*! The height, in screen coordinates, of the video mode.
     */
    int height;
    /*! The bit depth of the red channel of the video mode.
     */
    int redBits;
    /*! The bit depth of the green channel of the video mode.
     */
    int greenBits;
    /*! The bit depth of the blue channel of the video mode.
     */
    int blueBits;
    /*! The refresh rate, in Hz, of the video mode.
     */
    int refreshRate;
} GLFWvidmode;

/*! @brief Gamma ramp.
 *
 *  This describes the gamma ramp for a monitor.
 *
 *  @sa @ref monitor_gamma
 *  @sa @ref glfwGetGammaRamp
 *  @sa @ref glfwSetGammaRamp
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
typedef struct GLFWgammaramp
{
    /*! An array of value describing the response of the red channel.
     */
    unsigned short* red;
    /*! An array of value describing the response of the green channel.
     */
    unsigned short* green;
    /*! An array of value describing the response of the blue channel.
     */
    unsigned short* blue;
    /*! The number of elements in each array.
     */
    unsigned int size;
} GLFWgammaramp;

/*! @brief Image data.
 *
 *  This describes a single 2D image.  See the documentation for each related
 *  function what the expected pixel format is.
 *
 *  @sa @ref cursor_custom
 *  @sa @ref window_icon
 *
 *  @since Added in version 2.1.
 *  @glfw3 Removed format and bytes-per-pixel members.
 *
 *  @ingroup window
 */
typedef struct GLFWimage
{
    /*! The width, in pixels, of this image.
     */
    int width;
    /*! The height, in pixels, of this image.
     */
    int height;
    /*! The pixel data of this image, arranged left-to-right, top-to-bottom.
     */
    unsigned char* pixels;
} GLFWimage;

/*! @brief Gamepad input state
 *
 *  This describes the input state of a gamepad.
 *
 *  @sa @ref gamepad
 *  @sa @ref glfwGetGamepadState
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
typedef struct GLFWgamepadstate
{
    /*! The states of each [gamepad button](@ref gamepad_buttons), `GLFW_PRESS`
     *  or `GLFW_RELEASE`.
     */
    unsigned char buttons[15];
    /*! The states of each [gamepad axis](@ref gamepad_axes), in the range -1.0
     *  to 1.0 inclusive.
     */
    float axes[6];
} GLFWgamepadstate;


/*************************************************************************
 * GLFW API functions
 *************************************************************************/

/*! @brief Initializes the GLFW library.
 *
 *  This function initializes the GLFW library.  Before most GLFW functions can
 *  be used, GLFW must be initialized, and before an application terminates GLFW
 *  should be terminated in order to free any resources allocated during or
 *  after initialization.
 *
 *  If this function fails, it calls @ref glfwTerminate before returning.  If it
 *  succeeds, you should call @ref glfwTerminate before the application exits.
 *
 *  Additional calls to this function after successful initialization but before
 *  termination will return `GLFW_TRUE` immediately.
 *
 *  @return `GLFW_TRUE` if successful, or `GLFW_FALSE` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark @macos This function will change the current directory of the
 *  application to the `Contents/Resources` subdirectory of the application's
 *  bundle, if present.  This can be disabled with the @ref
 *  GLFW_COCOA_CHDIR_RESOURCES init hint.
 *
 *  @remark @macos This function will create the main menu and dock icon for the
 *  application.  If GLFW finds a `MainMenu.nib` it is loaded and assumed to
 *  contain a menu bar.  Otherwise a minimal menu bar is created manually with
 *  common commands like Hide, Quit and About.  The About entry opens a minimal
 *  about dialog with information from the application's bundle.  The menu bar
 *  and dock icon can be disabled entirely with the @ref GLFW_COCOA_MENUBAR init
 *  hint.
 *
 *  @remark @x11 This function will set the `LC_CTYPE` category of the
 *  application locale according to the current environment if that category is
 *  still "C".  This is because the "C" locale breaks Unicode text input.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref intro_init
 *  @sa @ref glfwTerminate
 *
 *  @since Added in version 1.0.
 *
 *  @ingroup init
 */
GLFWAPI int glfwInit(void);

/*! @brief Terminates the GLFW library.
 *
 *  This function destroys all remaining windows and cursors, restores any
 *  modified gamma ramps and frees any other allocated resources.  Once this
 *  function is called, you must again call @ref glfwInit successfully before
 *  you will be able to use most GLFW functions.
 *
 *  If GLFW has been successfully initialized, this function should be called
 *  before the application exits.  If initialization fails, there is no need to
 *  call this function, as it is called by @ref glfwInit before it returns
 *  failure.
 *
 *  @errors Possible errors include @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark This function may be called before @ref glfwInit.
 *
 *  @warning The contexts of any remaining windows must not be current on any
 *  other thread when this function is called.
 *
 *  @reentrancy This function must not be called from a callback.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref intro_init
 *  @sa @ref glfwInit
 *
 *  @since Added in version 1.0.
 *
 *  @ingroup init
 */
GLFWAPI void glfwTerminate(void);

/*! @brief Sets the specified init hint to the desired value.
 *
 *  This function sets hints for the next initialization of GLFW.
 *
 *  The values you set hints to are never reset by GLFW, but they only take
 *  effect during initialization.  Once GLFW has been initialized, any values
 *  you set will be ignored until the library is terminated and initialized
 *  again.
 *
 *  Some hints are platform specific.  These may be set on any platform but they
 *  will only affect their specific platform.  Other platforms will ignore them.
 *  Setting these hints requires no platform specific headers or functions.
 *
 *  @param[in] hint The [init hint](@ref init_hints) to set.
 *  @param[in] value The new value of the init hint.
 *
 *  @errors Possible errors include @ref GLFW_INVALID_ENUM and @ref
 *  GLFW_INVALID_VALUE.
 *
 *  @remarks This function may be called before @ref glfwInit.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa init_hints
 *  @sa glfwInit
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup init
 */
GLFWAPI void glfwInitHint(int hint, int value);

/*! @brief Retrieves the version of the GLFW library.
 *
 *  This function retrieves the major, minor and revision numbers of the GLFW
 *  library.  It is intended for when you are using GLFW as a shared library and
 *  want to ensure that you are using the minimum required version.
 *
 *  Any or all of the version arguments may be `NULL`.
 *
 *  @param[out] major Where to store the major version number, or `NULL`.
 *  @param[out] minor Where to store the minor version number, or `NULL`.
 *  @param[out] rev Where to store the revision number, or `NULL`.
 *
 *  @errors None.
 *
 *  @remark This function may be called before @ref glfwInit.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref intro_version
 *  @sa @ref glfwGetVersionString
 *
 *  @since Added in version 1.0.
 *
 *  @ingroup init
 */
GLFWAPI void glfwGetVersion(int* major, int* minor, int* rev);

/*! @brief Returns a string describing the compile-time configuration.
 *
 *  This function returns the compile-time generated
 *  [version string](@ref intro_version_string) of the GLFW library binary.  It
 *  describes the version, platform, compiler and any platform-specific
 *  compile-time options.  It should not be confused with the OpenGL or OpenGL
 *  ES version string, queried with `glGetString`.
 *
 *  __Do not use the version string__ to parse the GLFW library version.  The
 *  @ref glfwGetVersion function provides the version of the running library
 *  binary in numerical format.
 *
 *  @return The ASCII encoded GLFW version string.
 *
 *  @errors None.
 *
 *  @remark This function may be called before @ref glfwInit.
 *
 *  @pointer_lifetime The returned string is static and compile-time generated.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref intro_version
 *  @sa @ref glfwGetVersion
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup init
 */
GLFWAPI const char* glfwGetVersionString(void);

/*! @brief Returns and clears the last error for the calling thread.
 *
 *  This function returns and clears the [error code](@ref errors) of the last
 *  error that occurred on the calling thread, and optionally a UTF-8 encoded
 *  human-readable description of it.  If no error has occurred since the last
 *  call, it returns @ref GLFW_NO_ERROR (zero) and the description pointer is
 *  set to `NULL`.
 *
 *  @param[in] description Where to store the error description pointer, or `NULL`.
 *  @return The last error code for the calling thread, or @ref GLFW_NO_ERROR
 *  (zero).
 *
 *  @errors None.
 *
 *  @pointer_lifetime The returned string is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is guaranteed to be valid only until the
 *  next error occurs or the library is terminated.
 *
 *  @remark This function may be called before @ref glfwInit.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref error_handling
 *  @sa @ref glfwSetErrorCallback
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup init
 */
GLFWAPI int glfwGetError(const char** description);

/*! @brief Sets the error callback.
 *
 *  This function sets the error callback, which is called with an error code
 *  and a human-readable description each time a GLFW error occurs.
 *
 *  The error code is set before the callback is called.  Calling @ref
 *  glfwGetError from the error callback will return the same value as the error
 *  code argument.
 *
 *  The error callback is called on the thread where the error occurred.  If you
 *  are using GLFW from multiple threads, your error callback needs to be
 *  written accordingly.
 *
 *  Because the description string may have been generated specifically for that
 *  error, it is not guaranteed to be valid after the callback has returned.  If
 *  you wish to use it after the callback returns, you need to make a copy.
 *
 *  Once set, the error callback remains set even after the library has been
 *  terminated.
 *
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set.
 *
 *  @callback_signature
 *  @code
 *  void callback_name(int error_code, const char* description)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [callback pointer type](@ref GLFWerrorfun).
 *
 *  @errors None.
 *
 *  @remark This function may be called before @ref glfwInit.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref error_handling
 *  @sa @ref glfwGetError
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup init
 */
GLFWAPI GLFWerrorfun glfwSetErrorCallback(GLFWerrorfun callback);

/*! @brief Returns the currently connected monitors.
 *
 *  This function returns an array of handles for all currently connected
 *  monitors.  The primary monitor is always first in the returned array.  If no
 *  monitors were found, this function returns `NULL`.
 *
 *  @param[out] count Where to store the number of monitors in the returned
 *  array.  This is set to zero if an error occurred.
 *  @return An array of monitor handles, or `NULL` if no monitors were found or
 *  if an [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @pointer_lifetime The returned array is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is guaranteed to be valid only until the
 *  monitor configuration changes or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_monitors
 *  @sa @ref monitor_event
 *  @sa @ref glfwGetPrimaryMonitor
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI GLFWmonitor** glfwGetMonitors(int* count);

/*! @brief Returns the primary monitor.
 *
 *  This function returns the primary monitor.  This is usually the monitor
 *  where elements like the task bar or global menu bar are located.
 *
 *  @return The primary monitor, or `NULL` if no monitors were found or if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @remark The primary monitor is always first in the array returned by @ref
 *  glfwGetMonitors.
 *
 *  @sa @ref monitor_monitors
 *  @sa @ref glfwGetMonitors
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI GLFWmonitor* glfwGetPrimaryMonitor(void);

/*! @brief Returns the position of the monitor's viewport on the virtual screen.
 *
 *  This function returns the position, in screen coordinates, of the upper-left
 *  corner of the specified monitor.
 *
 *  Any or all of the position arguments may be `NULL`.  If an error occurs, all
 *  non-`NULL` position arguments will be set to zero.
 *
 *  @param[in] monitor The monitor to query.
 *  @param[out] xpos Where to store the monitor x-coordinate, or `NULL`.
 *  @param[out] ypos Where to store the monitor y-coordinate, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_properties
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI void glfwGetMonitorPos(GLFWmonitor* monitor, int* xpos, int* ypos);

/*! @brief Retrieves the work area of the monitor.
 *
 *  This function returns the position, in screen coordinates, of the upper-left
 *  corner of the work area of the specified monitor along with the work area
 *  size in screen coordinates. The work area is defined as the area of the
 *  monitor not occluded by the operating system task bar where present. If no
 *  task bar exists then the work area is the monitor resolution in screen
 *  coordinates.
 *
 *  Any or all of the position and size arguments may be `NULL`.  If an error
 *  occurs, all non-`NULL` position and size arguments will be set to zero.
 *
 *  @param[in] monitor The monitor to query.
 *  @param[out] xpos Where to store the monitor x-coordinate, or `NULL`.
 *  @param[out] ypos Where to store the monitor y-coordinate, or `NULL`.
 *  @param[out] width Where to store the monitor width, or `NULL`.
 *  @param[out] height Where to store the monitor height, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_workarea
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup monitor
 */
GLFWAPI void glfwGetMonitorWorkarea(GLFWmonitor* monitor, int* xpos, int* ypos, int* width, int* height);

/*! @brief Returns the physical size of the monitor.
 *
 *  This function returns the size, in millimetres, of the display area of the
 *  specified monitor.
 *
 *  Some systems do not provide accurate monitor size information, either
 *  because the monitor
 *  [EDID](https://en.wikipedia.org/wiki/Extended_display_identification_data)
 *  data is incorrect or because the driver does not report it accurately.
 *
 *  Any or all of the size arguments may be `NULL`.  If an error occurs, all
 *  non-`NULL` size arguments will be set to zero.
 *
 *  @param[in] monitor The monitor to query.
 *  @param[out] widthMM Where to store the width, in millimetres, of the
 *  monitor's display area, or `NULL`.
 *  @param[out] heightMM Where to store the height, in millimetres, of the
 *  monitor's display area, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @remark @win32 calculates the returned physical size from the
 *  current resolution and system DPI instead of querying the monitor EDID data.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_properties
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI void glfwGetMonitorPhysicalSize(GLFWmonitor* monitor, int* widthMM, int* heightMM);

/*! @brief Retrieves the content scale for the specified monitor.
 *
 *  This function retrieves the content scale for the specified monitor.  The
 *  content scale is the ratio between the current DPI and the platform's
 *  default DPI.  This is especially important for text and any UI elements.  If
 *  the pixel dimensions of your UI scaled by this look appropriate on your
 *  machine then it should appear at a reasonable size on other machines
 *  regardless of their DPI and scaling settings.  This relies on the system DPI
 *  and scaling settings being somewhat correct.
 *
 *  The content scale may depend on both the monitor resolution and pixel
 *  density and on user settings.  It may be very different from the raw DPI
 *  calculated from the physical size and current resolution.
 *
 *  @param[in] monitor The monitor to query.
 *  @param[out] xscale Where to store the x-axis content scale, or `NULL`.
 *  @param[out] yscale Where to store the y-axis content scale, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_scale
 *  @sa @ref glfwGetWindowContentScale
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup monitor
 */
GLFWAPI void glfwGetMonitorContentScale(GLFWmonitor* monitor, float* xscale, float* yscale);

/*! @brief Returns the name of the specified monitor.
 *
 *  This function returns a human-readable name, encoded as UTF-8, of the
 *  specified monitor.  The name typically reflects the make and model of the
 *  monitor and is not guaranteed to be unique among the connected monitors.
 *
 *  @param[in] monitor The monitor to query.
 *  @return The UTF-8 encoded name of the monitor, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @pointer_lifetime The returned string is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified monitor is
 *  disconnected or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_properties
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI const char* glfwGetMonitorName(GLFWmonitor* monitor);

/*! @brief Sets the user pointer of the specified monitor.
 *
 *  This function sets the user-defined pointer of the specified monitor.  The
 *  current value is retained until the monitor is disconnected.  The initial
 *  value is `NULL`.
 *
 *  This function may be called from the monitor callback, even for a monitor
 *  that is being disconnected.
 *
 *  @param[in] monitor The monitor whose pointer to set.
 *  @param[in] pointer The new value.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Access is not
 *  synchronized.
 *
 *  @sa @ref monitor_userptr
 *  @sa @ref glfwGetMonitorUserPointer
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup monitor
 */
GLFWAPI void glfwSetMonitorUserPointer(GLFWmonitor* monitor, void* pointer);

/*! @brief Returns the user pointer of the specified monitor.
 *
 *  This function returns the current value of the user-defined pointer of the
 *  specified monitor.  The initial value is `NULL`.
 *
 *  This function may be called from the monitor callback, even for a monitor
 *  that is being disconnected.
 *
 *  @param[in] monitor The monitor whose pointer to return.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Access is not
 *  synchronized.
 *
 *  @sa @ref monitor_userptr
 *  @sa @ref glfwSetMonitorUserPointer
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup monitor
 */
GLFWAPI void* glfwGetMonitorUserPointer(GLFWmonitor* monitor);

/*! @brief Sets the monitor configuration callback.
 *
 *  This function sets the monitor configuration callback, or removes the
 *  currently set callback.  This is called when a monitor is connected to or
 *  disconnected from the system.
 *
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWmonitor* monitor, int event)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWmonitorfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_event
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI GLFWmonitorfun glfwSetMonitorCallback(GLFWmonitorfun callback);

/*! @brief Returns the available video modes for the specified monitor.
 *
 *  This function returns an array of all video modes supported by the specified
 *  monitor.  The returned array is sorted in ascending order, first by color
 *  bit depth (the sum of all channel depths) and then by resolution area (the
 *  product of width and height).
 *
 *  @param[in] monitor The monitor to query.
 *  @param[out] count Where to store the number of video modes in the returned
 *  array.  This is set to zero if an error occurred.
 *  @return An array of video modes, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned array is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified monitor is
 *  disconnected, this function is called again for that monitor or the library
 *  is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_modes
 *  @sa @ref glfwGetVideoMode
 *
 *  @since Added in version 1.0.
 *  @glfw3 Changed to return an array of modes for a specific monitor.
 *
 *  @ingroup monitor
 */
GLFWAPI const GLFWvidmode* glfwGetVideoModes(GLFWmonitor* monitor, int* count);

/*! @brief Returns the current mode of the specified monitor.
 *
 *  This function returns the current video mode of the specified monitor.  If
 *  you have created a full screen window for that monitor, the return value
 *  will depend on whether that window is iconified.
 *
 *  @param[in] monitor The monitor to query.
 *  @return The current mode of the monitor, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned array is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified monitor is
 *  disconnected or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_modes
 *  @sa @ref glfwGetVideoModes
 *
 *  @since Added in version 3.0.  Replaces `glfwGetDesktopMode`.
 *
 *  @ingroup monitor
 */
GLFWAPI const GLFWvidmode* glfwGetVideoMode(GLFWmonitor* monitor);

/*! @brief Generates a gamma ramp and sets it for the specified monitor.
 *
 *  This function generates an appropriately sized gamma ramp from the specified
 *  exponent and then calls @ref glfwSetGammaRamp with it.  The value must be
 *  a finite number greater than zero.
 *
 *  The software controlled gamma ramp is applied _in addition_ to the hardware
 *  gamma correction, which today is usually an approximation of sRGB gamma.
 *  This means that setting a perfectly linear ramp, or gamma 1.0, will produce
 *  the default (usually sRGB-like) behavior.
 *
 *  For gamma correct rendering with OpenGL or OpenGL ES, see the @ref
 *  GLFW_SRGB_CAPABLE hint.
 *
 *  @param[in] monitor The monitor whose gamma ramp to set.
 *  @param[in] gamma The desired exponent.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_VALUE and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark @wayland Gamma handling is a privileged protocol, this function
 *  will thus never be implemented and emits @ref GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_gamma
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI void glfwSetGamma(GLFWmonitor* monitor, float gamma);

/*! @brief Returns the current gamma ramp for the specified monitor.
 *
 *  This function returns the current gamma ramp of the specified monitor.
 *
 *  @param[in] monitor The monitor to query.
 *  @return The current gamma ramp, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @wayland Gamma handling is a privileged protocol, this function
 *  will thus never be implemented and emits @ref GLFW_PLATFORM_ERROR while
 *  returning `NULL`.
 *
 *  @pointer_lifetime The returned structure and its arrays are allocated and
 *  freed by GLFW.  You should not free them yourself.  They are valid until the
 *  specified monitor is disconnected, this function is called again for that
 *  monitor or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_gamma
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI const GLFWgammaramp* glfwGetGammaRamp(GLFWmonitor* monitor);

/*! @brief Sets the current gamma ramp for the specified monitor.
 *
 *  This function sets the current gamma ramp for the specified monitor.  The
 *  original gamma ramp for that monitor is saved by GLFW the first time this
 *  function is called and is restored by @ref glfwTerminate.
 *
 *  The software controlled gamma ramp is applied _in addition_ to the hardware
 *  gamma correction, which today is usually an approximation of sRGB gamma.
 *  This means that setting a perfectly linear ramp, or gamma 1.0, will produce
 *  the default (usually sRGB-like) behavior.
 *
 *  For gamma correct rendering with OpenGL or OpenGL ES, see the @ref
 *  GLFW_SRGB_CAPABLE hint.
 *
 *  @param[in] monitor The monitor whose gamma ramp to set.
 *  @param[in] ramp The gamma ramp to use.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark The size of the specified gamma ramp should match the size of the
 *  current ramp for that monitor.
 *
 *  @remark @win32 The gamma ramp size must be 256.
 *
 *  @remark @wayland Gamma handling is a privileged protocol, this function
 *  will thus never be implemented and emits @ref GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The specified gamma ramp is copied before this function
 *  returns.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref monitor_gamma
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup monitor
 */
GLFWAPI void glfwSetGammaRamp(GLFWmonitor* monitor, const GLFWgammaramp* ramp);

/*! @brief Resets all window hints to their default values.
 *
 *  This function resets all window hints to their
 *  [default values](@ref window_hints_values).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_hints
 *  @sa @ref glfwWindowHint
 *  @sa @ref glfwWindowHintString
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI void glfwDefaultWindowHints(void);

/*! @brief Sets the specified window hint to the desired value.
 *
 *  This function sets hints for the next call to @ref glfwCreateWindow.  The
 *  hints, once set, retain their values until changed by a call to this
 *  function or @ref glfwDefaultWindowHints, or until the library is terminated.
 *
 *  Only integer value hints can be set with this function.  String value hints
 *  are set with @ref glfwWindowHintString.
 *
 *  This function does not check whether the specified hint values are valid.
 *  If you set hints to invalid values this will instead be reported by the next
 *  call to @ref glfwCreateWindow.
 *
 *  Some hints are platform specific.  These may be set on any platform but they
 *  will only affect their specific platform.  Other platforms will ignore them.
 *  Setting these hints requires no platform specific headers or functions.
 *
 *  @param[in] hint The [window hint](@ref window_hints) to set.
 *  @param[in] value The new value of the window hint.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_ENUM.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_hints
 *  @sa @ref glfwWindowHintString
 *  @sa @ref glfwDefaultWindowHints
 *
 *  @since Added in version 3.0.  Replaces `glfwOpenWindowHint`.
 *
 *  @ingroup window
 */
GLFWAPI void glfwWindowHint(int hint, int value);

/*! @brief Sets the specified window hint to the desired value.
 *
 *  This function sets hints for the next call to @ref glfwCreateWindow.  The
 *  hints, once set, retain their values until changed by a call to this
 *  function or @ref glfwDefaultWindowHints, or until the library is terminated.
 *
 *  Only string type hints can be set with this function.  Integer value hints
 *  are set with @ref glfwWindowHint.
 *
 *  This function does not check whether the specified hint values are valid.
 *  If you set hints to invalid values this will instead be reported by the next
 *  call to @ref glfwCreateWindow.
 *
 *  Some hints are platform specific.  These may be set on any platform but they
 *  will only affect their specific platform.  Other platforms will ignore them.
 *  Setting these hints requires no platform specific headers or functions.
 *
 *  @param[in] hint The [window hint](@ref window_hints) to set.
 *  @param[in] value The new value of the window hint.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_ENUM.
 *
 *  @pointer_lifetime The specified string is copied before this function
 *  returns.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_hints
 *  @sa @ref glfwWindowHint
 *  @sa @ref glfwDefaultWindowHints
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
GLFWAPI void glfwWindowHintString(int hint, const char* value);

/*! @brief Creates a window and its associated context.
 *
 *  This function creates a window and its associated OpenGL or OpenGL ES
 *  context.  Most of the options controlling how the window and its context
 *  should be created are specified with [window hints](@ref window_hints).
 *
 *  Successful creation does not change which context is current.  Before you
 *  can use the newly created context, you need to
 *  [make it current](@ref context_current).  For information about the `share`
 *  parameter, see @ref context_sharing.
 *
 *  The created window, framebuffer and context may differ from what you
 *  requested, as not all parameters and hints are
 *  [hard constraints](@ref window_hints_hard).  This includes the size of the
 *  window, especially for full screen windows.  To query the actual attributes
 *  of the created window, framebuffer and context, see @ref
 *  glfwGetWindowAttrib, @ref glfwGetWindowSize and @ref glfwGetFramebufferSize.
 *
 *  To create a full screen window, you need to specify the monitor the window
 *  will cover.  If no monitor is specified, the window will be windowed mode.
 *  Unless you have a way for the user to choose a specific monitor, it is
 *  recommended that you pick the primary monitor.  For more information on how
 *  to query connected monitors, see @ref monitor_monitors.
 *
 *  For full screen windows, the specified size becomes the resolution of the
 *  window's _desired video mode_.  As long as a full screen window is not
 *  iconified, the supported video mode most closely matching the desired video
 *  mode is set for the specified monitor.  For more information about full
 *  screen windows, including the creation of so called _windowed full screen_
 *  or _borderless full screen_ windows, see @ref window_windowed_full_screen.
 *
 *  Once you have created the window, you can switch it between windowed and
 *  full screen mode with @ref glfwSetWindowMonitor.  This will not affect its
 *  OpenGL or OpenGL ES context.
 *
 *  By default, newly created windows use the placement recommended by the
 *  window system.  To create the window at a specific position, make it
 *  initially invisible using the [GLFW_VISIBLE](@ref GLFW_VISIBLE_hint) window
 *  hint, set its [position](@ref window_pos) and then [show](@ref window_hide)
 *  it.
 *
 *  As long as at least one full screen window is not iconified, the screensaver
 *  is prohibited from starting.
 *
 *  Window systems put limits on window sizes.  Very large or very small window
 *  dimensions may be overridden by the window system on creation.  Check the
 *  actual [size](@ref window_size) after creation.
 *
 *  The [swap interval](@ref buffer_swap) is not set during window creation and
 *  the initial value may vary depending on driver settings and defaults.
 *
 *  @param[in] width The desired width, in screen coordinates, of the window.
 *  This must be greater than zero.
 *  @param[in] height The desired height, in screen coordinates, of the window.
 *  This must be greater than zero.
 *  @param[in] title The initial, UTF-8 encoded window title.
 *  @param[in] monitor The monitor to use for full screen mode, or `NULL` for
 *  windowed mode.
 *  @param[in] share The window whose context to share resources with, or `NULL`
 *  to not share resources.
 *  @return The handle of the created window, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM, @ref GLFW_INVALID_VALUE, @ref GLFW_API_UNAVAILABLE, @ref
 *  GLFW_VERSION_UNAVAILABLE, @ref GLFW_FORMAT_UNAVAILABLE and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @win32 Window creation will fail if the Microsoft GDI software
 *  OpenGL implementation is the only one available.
 *
 *  @remark @win32 If the executable has an icon resource named `GLFW_ICON,` it
 *  will be set as the initial icon for the window.  If no such icon is present,
 *  the `IDI_APPLICATION` icon will be used instead.  To set a different icon,
 *  see @ref glfwSetWindowIcon.
 *
 *  @remark @win32 The context to share resources with must not be current on
 *  any other thread.
 *
 *  @remark @macos The OS only supports core profile contexts for OpenGL
 *  versions 3.2 and later.  Before creating an OpenGL context of version 3.2 or
 *  later you must set the [GLFW_OPENGL_PROFILE](@ref GLFW_OPENGL_PROFILE_hint)
 *  hint accordingly.  OpenGL 3.0 and 3.1 contexts are not supported at all
 *  on macOS.
 *
 *  @remark @macos The GLFW window has no icon, as it is not a document
 *  window, but the dock icon will be the same as the application bundle's icon.
 *  For more information on bundles, see the
 *  [Bundle Programming Guide](https://developer.apple.com/library/mac/documentation/CoreFoundation/Conceptual/CFBundles/)
 *  in the Mac Developer Library.
 *
 *  @remark @macos On OS X 10.10 and later the window frame will not be rendered
 *  at full resolution on Retina displays unless the
 *  [GLFW_COCOA_RETINA_FRAMEBUFFER](@ref GLFW_COCOA_RETINA_FRAMEBUFFER_hint)
 *  hint is `GLFW_TRUE` and the `NSHighResolutionCapable` key is enabled in the
 *  application bundle's `Info.plist`.  For more information, see
 *  [High Resolution Guidelines for OS X](https://developer.apple.com/library/mac/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Explained/Explained.html)
 *  in the Mac Developer Library.  The GLFW test and example programs use
 *  a custom `Info.plist` template for this, which can be found as
 *  `CMake/Info.plist.in` in the source tree.
 *
 *  @remark @macos When activating frame autosaving with
 *  [GLFW_COCOA_FRAME_NAME](@ref GLFW_COCOA_FRAME_NAME_hint), the specified
 *  window size and position may be overridden by previously saved values.
 *
 *  @remark @x11 Some window managers will not respect the placement of
 *  initially hidden windows.
 *
 *  @remark @x11 Due to the asynchronous nature of X11, it may take a moment for
 *  a window to reach its requested state.  This means you may not be able to
 *  query the final size, position or other attributes directly after window
 *  creation.
 *
 *  @remark @x11 The class part of the `WM_CLASS` window property will by
 *  default be set to the window title passed to this function.  The instance
 *  part will use the contents of the `RESOURCE_NAME` environment variable, if
 *  present and not empty, or fall back to the window title.  Set the
 *  [GLFW_X11_CLASS_NAME](@ref GLFW_X11_CLASS_NAME_hint) and
 *  [GLFW_X11_INSTANCE_NAME](@ref GLFW_X11_INSTANCE_NAME_hint) window hints to
 *  override this.
 *
 *  @remark @wayland Compositors should implement the xdg-decoration protocol
 *  for GLFW to decorate the window properly.  If this protocol isn't
 *  supported, or if the compositor prefers client-side decorations, a very
 *  simple fallback frame will be drawn using the wp_viewporter protocol.  A
 *  compositor can still emit close, maximize or fullscreen events, using for
 *  instance a keybind mechanism.  If neither of these protocols is supported,
 *  the window won't be decorated.
 *
 *  @remark @wayland A full screen window will not attempt to change the mode,
 *  no matter what the requested size or refresh rate.
 *
 *  @remark @wayland Screensaver inhibition requires the idle-inhibit protocol
 *  to be implemented in the user's compositor.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_creation
 *  @sa @ref glfwDestroyWindow
 *
 *  @since Added in version 3.0.  Replaces `glfwOpenWindow`.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindow* glfwCreateWindow(int width, int height, const char* title, GLFWmonitor* monitor, GLFWwindow* share);

/*! @brief Destroys the specified window and its context.
 *
 *  This function destroys the specified window and its context.  On calling
 *  this function, no further callbacks will be called for that window.
 *
 *  If the context of the specified window is current on the main thread, it is
 *  detached before being destroyed.
 *
 *  @param[in] window The window to destroy.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @note The context of the specified window must not be current on any other
 *  thread when this function is called.
 *
 *  @reentrancy This function must not be called from a callback.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_creation
 *  @sa @ref glfwCreateWindow
 *
 *  @since Added in version 3.0.  Replaces `glfwCloseWindow`.
 *
 *  @ingroup window
 */
GLFWAPI void glfwDestroyWindow(GLFWwindow* window);

/*! @brief Checks the close flag of the specified window.
 *
 *  This function returns the value of the close flag of the specified window.
 *
 *  @param[in] window The window to query.
 *  @return The value of the close flag.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Access is not
 *  synchronized.
 *
 *  @sa @ref window_close
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI int glfwWindowShouldClose(GLFWwindow* window);

/*! @brief Sets the close flag of the specified window.
 *
 *  This function sets the value of the close flag of the specified window.
 *  This can be used to override the user's attempt to close the window, or
 *  to signal that it should be closed.
 *
 *  @param[in] window The window whose flag to change.
 *  @param[in] value The new value.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Access is not
 *  synchronized.
 *
 *  @sa @ref window_close
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowShouldClose(GLFWwindow* window, int value);

/*! @brief Sets the title of the specified window.
 *
 *  This function sets the window title, encoded as UTF-8, of the specified
 *  window.
 *
 *  @param[in] window The window whose title to change.
 *  @param[in] title The UTF-8 encoded window title.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @macos The window title will not be updated until the next time you
 *  process events.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_title
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowTitle(GLFWwindow* window, const char* title);

/*! @brief Sets the icon for the specified window.
 *
 *  This function sets the icon of the specified window.  If passed an array of
 *  candidate images, those of or closest to the sizes desired by the system are
 *  selected.  If no images are specified, the window reverts to its default
 *  icon.
 *
 *  The pixels are 32-bit, little-endian, non-premultiplied RGBA, i.e. eight
 *  bits per channel with the red channel first.  They are arranged canonically
 *  as packed sequential rows, starting from the top-left corner.
 *
 *  The desired image sizes varies depending on platform and system settings.
 *  The selected images will be rescaled as needed.  Good sizes include 16x16,
 *  32x32 and 48x48.
 *
 *  @param[in] window The window whose icon to set.
 *  @param[in] count The number of images in the specified array, or zero to
 *  revert to the default window icon.
 *  @param[in] images The images to create the icon from.  This is ignored if
 *  count is zero.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The specified image data is copied before this function
 *  returns.
 *
 *  @remark @macos The GLFW window has no icon, as it is not a document
 *  window, so this function does nothing.  The dock icon will be the same as
 *  the application bundle's icon.  For more information on bundles, see the
 *  [Bundle Programming Guide](https://developer.apple.com/library/mac/documentation/CoreFoundation/Conceptual/CFBundles/)
 *  in the Mac Developer Library.
 *
 *  @remark @wayland There is no existing protocol to change an icon, the
 *  window will thus inherit the one defined in the application's desktop file.
 *  This function always emits @ref GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_icon
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowIcon(GLFWwindow* window, int count, const GLFWimage* images);

/*! @brief Retrieves the position of the content area of the specified window.
 *
 *  This function retrieves the position, in screen coordinates, of the
 *  upper-left corner of the content area of the specified window.
 *
 *  Any or all of the position arguments may be `NULL`.  If an error occurs, all
 *  non-`NULL` position arguments will be set to zero.
 *
 *  @param[in] window The window to query.
 *  @param[out] xpos Where to store the x-coordinate of the upper-left corner of
 *  the content area, or `NULL`.
 *  @param[out] ypos Where to store the y-coordinate of the upper-left corner of
 *  the content area, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @wayland There is no way for an application to retrieve the global
 *  position of its windows, this function will always emit @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_pos
 *  @sa @ref glfwSetWindowPos
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI void glfwGetWindowPos(GLFWwindow* window, int* xpos, int* ypos);

/*! @brief Sets the position of the content area of the specified window.
 *
 *  This function sets the position, in screen coordinates, of the upper-left
 *  corner of the content area of the specified windowed mode window.  If the
 *  window is a full screen window, this function does nothing.
 *
 *  __Do not use this function__ to move an already visible window unless you
 *  have very good reasons for doing so, as it will confuse and annoy the user.
 *
 *  The window manager may put limits on what positions are allowed.  GLFW
 *  cannot and should not override these limits.
 *
 *  @param[in] window The window to query.
 *  @param[in] xpos The x-coordinate of the upper-left corner of the content area.
 *  @param[in] ypos The y-coordinate of the upper-left corner of the content area.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @wayland There is no way for an application to set the global
 *  position of its windows, this function will always emit @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_pos
 *  @sa @ref glfwGetWindowPos
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowPos(GLFWwindow* window, int xpos, int ypos);

/*! @brief Retrieves the size of the content area of the specified window.
 *
 *  This function retrieves the size, in screen coordinates, of the content area
 *  of the specified window.  If you wish to retrieve the size of the
 *  framebuffer of the window in pixels, see @ref glfwGetFramebufferSize.
 *
 *  Any or all of the size arguments may be `NULL`.  If an error occurs, all
 *  non-`NULL` size arguments will be set to zero.
 *
 *  @param[in] window The window whose size to retrieve.
 *  @param[out] width Where to store the width, in screen coordinates, of the
 *  content area, or `NULL`.
 *  @param[out] height Where to store the height, in screen coordinates, of the
 *  content area, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_size
 *  @sa @ref glfwSetWindowSize
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
GLFWAPI void glfwGetWindowSize(GLFWwindow* window, int* width, int* height);

/*! @brief Sets the size limits of the specified window.
 *
 *  This function sets the size limits of the content area of the specified
 *  window.  If the window is full screen, the size limits only take effect
 *  once it is made windowed.  If the window is not resizable, this function
 *  does nothing.
 *
 *  The size limits are applied immediately to a windowed mode window and may
 *  cause it to be resized.
 *
 *  The maximum dimensions must be greater than or equal to the minimum
 *  dimensions and all must be greater than or equal to zero.
 *
 *  @param[in] window The window to set limits for.
 *  @param[in] minwidth The minimum width, in screen coordinates, of the content
 *  area, or `GLFW_DONT_CARE`.
 *  @param[in] minheight The minimum height, in screen coordinates, of the
 *  content area, or `GLFW_DONT_CARE`.
 *  @param[in] maxwidth The maximum width, in screen coordinates, of the content
 *  area, or `GLFW_DONT_CARE`.
 *  @param[in] maxheight The maximum height, in screen coordinates, of the
 *  content area, or `GLFW_DONT_CARE`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_VALUE and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark If you set size limits and an aspect ratio that conflict, the
 *  results are undefined.
 *
 *  @remark @wayland The size limits will not be applied until the window is
 *  actually resized, either by the user or by the compositor.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_sizelimits
 *  @sa @ref glfwSetWindowAspectRatio
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowSizeLimits(GLFWwindow* window, int minwidth, int minheight, int maxwidth, int maxheight);

/*! @brief Sets the aspect ratio of the specified window.
 *
 *  This function sets the required aspect ratio of the content area of the
 *  specified window.  If the window is full screen, the aspect ratio only takes
 *  effect once it is made windowed.  If the window is not resizable, this
 *  function does nothing.
 *
 *  The aspect ratio is specified as a numerator and a denominator and both
 *  values must be greater than zero.  For example, the common 16:9 aspect ratio
 *  is specified as 16 and 9, respectively.
 *
 *  If the numerator and denominator is set to `GLFW_DONT_CARE` then the aspect
 *  ratio limit is disabled.
 *
 *  The aspect ratio is applied immediately to a windowed mode window and may
 *  cause it to be resized.
 *
 *  @param[in] window The window to set limits for.
 *  @param[in] numer The numerator of the desired aspect ratio, or
 *  `GLFW_DONT_CARE`.
 *  @param[in] denom The denominator of the desired aspect ratio, or
 *  `GLFW_DONT_CARE`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_VALUE and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark If you set size limits and an aspect ratio that conflict, the
 *  results are undefined.
 *
 *  @remark @wayland The aspect ratio will not be applied until the window is
 *  actually resized, either by the user or by the compositor.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_sizelimits
 *  @sa @ref glfwSetWindowSizeLimits
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowAspectRatio(GLFWwindow* window, int numer, int denom);

/*! @brief Sets the size of the content area of the specified window.
 *
 *  This function sets the size, in screen coordinates, of the content area of
 *  the specified window.
 *
 *  For full screen windows, this function updates the resolution of its desired
 *  video mode and switches to the video mode closest to it, without affecting
 *  the window's context.  As the context is unaffected, the bit depths of the
 *  framebuffer remain unchanged.
 *
 *  If you wish to update the refresh rate of the desired video mode in addition
 *  to its resolution, see @ref glfwSetWindowMonitor.
 *
 *  The window manager may put limits on what sizes are allowed.  GLFW cannot
 *  and should not override these limits.
 *
 *  @param[in] window The window to resize.
 *  @param[in] width The desired width, in screen coordinates, of the window
 *  content area.
 *  @param[in] height The desired height, in screen coordinates, of the window
 *  content area.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @wayland A full screen window will not attempt to change the mode,
 *  no matter what the requested size.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_size
 *  @sa @ref glfwGetWindowSize
 *  @sa @ref glfwSetWindowMonitor
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowSize(GLFWwindow* window, int width, int height);

/*! @brief Retrieves the size of the framebuffer of the specified window.
 *
 *  This function retrieves the size, in pixels, of the framebuffer of the
 *  specified window.  If you wish to retrieve the size of the window in screen
 *  coordinates, see @ref glfwGetWindowSize.
 *
 *  Any or all of the size arguments may be `NULL`.  If an error occurs, all
 *  non-`NULL` size arguments will be set to zero.
 *
 *  @param[in] window The window whose framebuffer to query.
 *  @param[out] width Where to store the width, in pixels, of the framebuffer,
 *  or `NULL`.
 *  @param[out] height Where to store the height, in pixels, of the framebuffer,
 *  or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_fbsize
 *  @sa @ref glfwSetFramebufferSizeCallback
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI void glfwGetFramebufferSize(GLFWwindow* window, int* width, int* height);

/*! @brief Retrieves the size of the frame of the window.
 *
 *  This function retrieves the size, in screen coordinates, of each edge of the
 *  frame of the specified window.  This size includes the title bar, if the
 *  window has one.  The size of the frame may vary depending on the
 *  [window-related hints](@ref window_hints_wnd) used to create it.
 *
 *  Because this function retrieves the size of each window frame edge and not
 *  the offset along a particular coordinate axis, the retrieved values will
 *  always be zero or positive.
 *
 *  Any or all of the size arguments may be `NULL`.  If an error occurs, all
 *  non-`NULL` size arguments will be set to zero.
 *
 *  @param[in] window The window whose frame size to query.
 *  @param[out] left Where to store the size, in screen coordinates, of the left
 *  edge of the window frame, or `NULL`.
 *  @param[out] top Where to store the size, in screen coordinates, of the top
 *  edge of the window frame, or `NULL`.
 *  @param[out] right Where to store the size, in screen coordinates, of the
 *  right edge of the window frame, or `NULL`.
 *  @param[out] bottom Where to store the size, in screen coordinates, of the
 *  bottom edge of the window frame, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_size
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup window
 */
GLFWAPI void glfwGetWindowFrameSize(GLFWwindow* window, int* left, int* top, int* right, int* bottom);

/*! @brief Retrieves the content scale for the specified window.
 *
 *  This function retrieves the content scale for the specified window.  The
 *  content scale is the ratio between the current DPI and the platform's
 *  default DPI.  This is especially important for text and any UI elements.  If
 *  the pixel dimensions of your UI scaled by this look appropriate on your
 *  machine then it should appear at a reasonable size on other machines
 *  regardless of their DPI and scaling settings.  This relies on the system DPI
 *  and scaling settings being somewhat correct.
 *
 *  On systems where each monitors can have its own content scale, the window
 *  content scale will depend on which monitor the system considers the window
 *  to be on.
 *
 *  @param[in] window The window to query.
 *  @param[out] xscale Where to store the x-axis content scale, or `NULL`.
 *  @param[out] yscale Where to store the y-axis content scale, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_scale
 *  @sa @ref glfwSetWindowContentScaleCallback
 *  @sa @ref glfwGetMonitorContentScale
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
GLFWAPI void glfwGetWindowContentScale(GLFWwindow* window, float* xscale, float* yscale);

/*! @brief Returns the opacity of the whole window.
 *
 *  This function returns the opacity of the window, including any decorations.
 *
 *  The opacity (or alpha) value is a positive finite number between zero and
 *  one, where zero is fully transparent and one is fully opaque.  If the system
 *  does not support whole window transparency, this function always returns one.
 *
 *  The initial opacity value for newly created windows is one.
 *
 *  @param[in] window The window to query.
 *  @return The opacity value of the specified window.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_transparency
 *  @sa @ref glfwSetWindowOpacity
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
GLFWAPI float glfwGetWindowOpacity(GLFWwindow* window);

/*! @brief Sets the opacity of the whole window.
 *
 *  This function sets the opacity of the window, including any decorations.
 *
 *  The opacity (or alpha) value is a positive finite number between zero and
 *  one, where zero is fully transparent and one is fully opaque.
 *
 *  The initial opacity value for newly created windows is one.
 *
 *  A window created with framebuffer transparency may not use whole window
 *  transparency.  The results of doing this are undefined.
 *
 *  @param[in] window The window to set the opacity for.
 *  @param[in] opacity The desired opacity of the specified window.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_transparency
 *  @sa @ref glfwGetWindowOpacity
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowOpacity(GLFWwindow* window, float opacity);

/*! @brief Iconifies the specified window.
 *
 *  This function iconifies (minimizes) the specified window if it was
 *  previously restored.  If the window is already iconified, this function does
 *  nothing.
 *
 *  If the specified window is a full screen window, the original monitor
 *  resolution is restored until the window is restored.
 *
 *  @param[in] window The window to iconify.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @wayland Once a window is iconified, @ref glfwRestoreWindow won’t
 *  be able to restore it.  This is a design decision of the xdg-shell
 *  protocol.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_iconify
 *  @sa @ref glfwRestoreWindow
 *  @sa @ref glfwMaximizeWindow
 *
 *  @since Added in version 2.1.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
GLFWAPI void glfwIconifyWindow(GLFWwindow* window);

/*! @brief Restores the specified window.
 *
 *  This function restores the specified window if it was previously iconified
 *  (minimized) or maximized.  If the window is already restored, this function
 *  does nothing.
 *
 *  If the specified window is a full screen window, the resolution chosen for
 *  the window is restored on the selected monitor.
 *
 *  @param[in] window The window to restore.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_iconify
 *  @sa @ref glfwIconifyWindow
 *  @sa @ref glfwMaximizeWindow
 *
 *  @since Added in version 2.1.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
GLFWAPI void glfwRestoreWindow(GLFWwindow* window);

/*! @brief Maximizes the specified window.
 *
 *  This function maximizes the specified window if it was previously not
 *  maximized.  If the window is already maximized, this function does nothing.
 *
 *  If the specified window is a full screen window, this function does nothing.
 *
 *  @param[in] window The window to maximize.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @par Thread Safety
 *  This function may only be called from the main thread.
 *
 *  @sa @ref window_iconify
 *  @sa @ref glfwIconifyWindow
 *  @sa @ref glfwRestoreWindow
 *
 *  @since Added in GLFW 3.2.
 *
 *  @ingroup window
 */
GLFWAPI void glfwMaximizeWindow(GLFWwindow* window);

/*! @brief Makes the specified window visible.
 *
 *  This function makes the specified window visible if it was previously
 *  hidden.  If the window is already visible or is in full screen mode, this
 *  function does nothing.
 *
 *  By default, windowed mode windows are focused when shown
 *  Set the [GLFW_FOCUS_ON_SHOW](@ref GLFW_FOCUS_ON_SHOW_hint) window hint
 *  to change this behavior for all newly created windows, or change the
 *  behavior for an existing window with @ref glfwSetWindowAttrib.
 *
 *  @param[in] window The window to make visible.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_hide
 *  @sa @ref glfwHideWindow
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI void glfwShowWindow(GLFWwindow* window);

/*! @brief Hides the specified window.
 *
 *  This function hides the specified window if it was previously visible.  If
 *  the window is already hidden or is in full screen mode, this function does
 *  nothing.
 *
 *  @param[in] window The window to hide.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_hide
 *  @sa @ref glfwShowWindow
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI void glfwHideWindow(GLFWwindow* window);

/*! @brief Brings the specified window to front and sets input focus.
 *
 *  This function brings the specified window to front and sets input focus.
 *  The window should already be visible and not iconified.
 *
 *  By default, both windowed and full screen mode windows are focused when
 *  initially created.  Set the [GLFW_FOCUSED](@ref GLFW_FOCUSED_hint) to
 *  disable this behavior.
 *
 *  Also by default, windowed mode windows are focused when shown
 *  with @ref glfwShowWindow. Set the
 *  [GLFW_FOCUS_ON_SHOW](@ref GLFW_FOCUS_ON_SHOW_hint) to disable this behavior.
 *
 *  __Do not use this function__ to steal focus from other applications unless
 *  you are certain that is what the user wants.  Focus stealing can be
 *  extremely disruptive.
 *
 *  For a less disruptive way of getting the user's attention, see
 *  [attention requests](@ref window_attention).
 *
 *  @param[in] window The window to give input focus.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @wayland It is not possible for an application to bring its windows
 *  to front, this function will always emit @ref GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_focus
 *  @sa @ref window_attention
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup window
 */
GLFWAPI void glfwFocusWindow(GLFWwindow* window);

/*! @brief Requests user attention to the specified window.
 *
 *  This function requests user attention to the specified window.  On
 *  platforms where this is not supported, attention is requested to the
 *  application as a whole.
 *
 *  Once the user has given attention, usually by focusing the window or
 *  application, the system will end the request automatically.
 *
 *  @param[in] window The window to request attention to.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @macos Attention is requested to the application as a whole, not the
 *  specific window.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_attention
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
GLFWAPI void glfwRequestWindowAttention(GLFWwindow* window);

/*! @brief Returns the monitor that the window uses for full screen mode.
 *
 *  This function returns the handle of the monitor that the specified window is
 *  in full screen on.
 *
 *  @param[in] window The window to query.
 *  @return The monitor, or `NULL` if the window is in windowed mode or an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_monitor
 *  @sa @ref glfwSetWindowMonitor
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI GLFWmonitor* glfwGetWindowMonitor(GLFWwindow* window);

/*! @brief Sets the mode, monitor, video mode and placement of a window.
 *
 *  This function sets the monitor that the window uses for full screen mode or,
 *  if the monitor is `NULL`, makes it windowed mode.
 *
 *  When setting a monitor, this function updates the width, height and refresh
 *  rate of the desired video mode and switches to the video mode closest to it.
 *  The window position is ignored when setting a monitor.
 *
 *  When the monitor is `NULL`, the position, width and height are used to
 *  place the window content area.  The refresh rate is ignored when no monitor
 *  is specified.
 *
 *  If you only wish to update the resolution of a full screen window or the
 *  size of a windowed mode window, see @ref glfwSetWindowSize.
 *
 *  When a window transitions from full screen to windowed mode, this function
 *  restores any previous window settings such as whether it is decorated,
 *  floating, resizable, has size or aspect ratio limits, etc.
 *
 *  @param[in] window The window whose monitor, size or video mode to set.
 *  @param[in] monitor The desired monitor, or `NULL` to set windowed mode.
 *  @param[in] xpos The desired x-coordinate of the upper-left corner of the
 *  content area.
 *  @param[in] ypos The desired y-coordinate of the upper-left corner of the
 *  content area.
 *  @param[in] width The desired with, in screen coordinates, of the content
 *  area or video mode.
 *  @param[in] height The desired height, in screen coordinates, of the content
 *  area or video mode.
 *  @param[in] refreshRate The desired refresh rate, in Hz, of the video mode,
 *  or `GLFW_DONT_CARE`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark The OpenGL or OpenGL ES context will not be destroyed or otherwise
 *  affected by any resizing or mode switching, although you may need to update
 *  your viewport if the framebuffer size has changed.
 *
 *  @remark @wayland The desired window position is ignored, as there is no way
 *  for an application to set this property.
 *
 *  @remark @wayland Setting the window to full screen will not attempt to
 *  change the mode, no matter what the requested size or refresh rate.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_monitor
 *  @sa @ref window_full_screen
 *  @sa @ref glfwGetWindowMonitor
 *  @sa @ref glfwSetWindowSize
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowMonitor(GLFWwindow* window, GLFWmonitor* monitor, int xpos, int ypos, int width, int height, int refreshRate);

/*! @brief Returns an attribute of the specified window.
 *
 *  This function returns the value of an attribute of the specified window or
 *  its OpenGL or OpenGL ES context.
 *
 *  @param[in] window The window to query.
 *  @param[in] attrib The [window attribute](@ref window_attribs) whose value to
 *  return.
 *  @return The value of the attribute, or zero if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark Framebuffer related hints are not window attributes.  See @ref
 *  window_attribs_fb for more information.
 *
 *  @remark Zero is a valid value for many window and context related
 *  attributes so you cannot use a return value of zero as an indication of
 *  errors.  However, this function should not fail as long as it is passed
 *  valid arguments and the library has been [initialized](@ref intro_init).
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_attribs
 *  @sa @ref glfwSetWindowAttrib
 *
 *  @since Added in version 3.0.  Replaces `glfwGetWindowParam` and
 *  `glfwGetGLVersion`.
 *
 *  @ingroup window
 */
GLFWAPI int glfwGetWindowAttrib(GLFWwindow* window, int attrib);

/*! @brief Sets an attribute of the specified window.
 *
 *  This function sets the value of an attribute of the specified window.
 *
 *  The supported attributes are [GLFW_DECORATED](@ref GLFW_DECORATED_attrib),
 *  [GLFW_RESIZABLE](@ref GLFW_RESIZABLE_attrib),
 *  [GLFW_FLOATING](@ref GLFW_FLOATING_attrib),
 *  [GLFW_AUTO_ICONIFY](@ref GLFW_AUTO_ICONIFY_attrib) and
 *  [GLFW_FOCUS_ON_SHOW](@ref GLFW_FOCUS_ON_SHOW_attrib).
 *
 *  Some of these attributes are ignored for full screen windows.  The new
 *  value will take effect if the window is later made windowed.
 *
 *  Some of these attributes are ignored for windowed mode windows.  The new
 *  value will take effect if the window is later made full screen.
 *
 *  @param[in] window The window to set the attribute for.
 *  @param[in] attrib A supported window attribute.
 *  @param[in] value `GLFW_TRUE` or `GLFW_FALSE`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM, @ref GLFW_INVALID_VALUE and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark Calling @ref glfwGetWindowAttrib will always return the latest
 *  value, even if that value is ignored by the current mode of the window.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_attribs
 *  @sa @ref glfwGetWindowAttrib
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowAttrib(GLFWwindow* window, int attrib, int value);

/*! @brief Sets the user pointer of the specified window.
 *
 *  This function sets the user-defined pointer of the specified window.  The
 *  current value is retained until the window is destroyed.  The initial value
 *  is `NULL`.
 *
 *  @param[in] window The window whose pointer to set.
 *  @param[in] pointer The new value.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Access is not
 *  synchronized.
 *
 *  @sa @ref window_userptr
 *  @sa @ref glfwGetWindowUserPointer
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSetWindowUserPointer(GLFWwindow* window, void* pointer);

/*! @brief Returns the user pointer of the specified window.
 *
 *  This function returns the current value of the user-defined pointer of the
 *  specified window.  The initial value is `NULL`.
 *
 *  @param[in] window The window whose pointer to return.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Access is not
 *  synchronized.
 *
 *  @sa @ref window_userptr
 *  @sa @ref glfwSetWindowUserPointer
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI void* glfwGetWindowUserPointer(GLFWwindow* window);

/*! @brief Sets the position callback for the specified window.
 *
 *  This function sets the position callback of the specified window, which is
 *  called when the window is moved.  The callback is provided with the
 *  position, in screen coordinates, of the upper-left corner of the content
 *  area of the window.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int xpos, int ypos)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWwindowposfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @remark @wayland This callback will never be called, as there is no way for
 *  an application to know its global position.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_pos
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindowposfun glfwSetWindowPosCallback(GLFWwindow* window, GLFWwindowposfun callback);

/*! @brief Sets the size callback for the specified window.
 *
 *  This function sets the size callback of the specified window, which is
 *  called when the window is resized.  The callback is provided with the size,
 *  in screen coordinates, of the content area of the window.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int width, int height)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWwindowsizefun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_size
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter and return value.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindowsizefun glfwSetWindowSizeCallback(GLFWwindow* window, GLFWwindowsizefun callback);

/*! @brief Sets the close callback for the specified window.
 *
 *  This function sets the close callback of the specified window, which is
 *  called when the user attempts to close the window, for example by clicking
 *  the close widget in the title bar.
 *
 *  The close flag is set before this callback is called, but you can modify it
 *  at any time with @ref glfwSetWindowShouldClose.
 *
 *  The close callback is not triggered by @ref glfwDestroyWindow.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWwindowclosefun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @remark @macos Selecting Quit from the application menu will trigger the
 *  close callback for all windows.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_close
 *
 *  @since Added in version 2.5.
 *  @glfw3 Added window handle parameter and return value.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindowclosefun glfwSetWindowCloseCallback(GLFWwindow* window, GLFWwindowclosefun callback);

/*! @brief Sets the refresh callback for the specified window.
 *
 *  This function sets the refresh callback of the specified window, which is
 *  called when the content area of the window needs to be redrawn, for example
 *  if the window has been exposed after having been covered by another window.
 *
 *  On compositing window systems such as Aero, Compiz, Aqua or Wayland, where
 *  the window contents are saved off-screen, this callback may be called only
 *  very infrequently or never at all.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window);
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWwindowrefreshfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_refresh
 *
 *  @since Added in version 2.5.
 *  @glfw3 Added window handle parameter and return value.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindowrefreshfun glfwSetWindowRefreshCallback(GLFWwindow* window, GLFWwindowrefreshfun callback);

/*! @brief Sets the focus callback for the specified window.
 *
 *  This function sets the focus callback of the specified window, which is
 *  called when the window gains or loses input focus.
 *
 *  After the focus callback is called for a window that lost input focus,
 *  synthetic key and mouse button release events will be generated for all such
 *  that had been pressed.  For more information, see @ref glfwSetKeyCallback
 *  and @ref glfwSetMouseButtonCallback.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int focused)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWwindowfocusfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_focus
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindowfocusfun glfwSetWindowFocusCallback(GLFWwindow* window, GLFWwindowfocusfun callback);

/*! @brief Sets the iconify callback for the specified window.
 *
 *  This function sets the iconification callback of the specified window, which
 *  is called when the window is iconified or restored.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int iconified)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWwindowiconifyfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_iconify
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindowiconifyfun glfwSetWindowIconifyCallback(GLFWwindow* window, GLFWwindowiconifyfun callback);

/*! @brief Sets the maximize callback for the specified window.
 *
 *  This function sets the maximization callback of the specified window, which
 *  is called when the window is maximized or restored.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int maximized)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWwindowmaximizefun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_maximize
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindowmaximizefun glfwSetWindowMaximizeCallback(GLFWwindow* window, GLFWwindowmaximizefun callback);

/*! @brief Sets the framebuffer resize callback for the specified window.
 *
 *  This function sets the framebuffer resize callback of the specified window,
 *  which is called when the framebuffer of the specified window is resized.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int width, int height)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWframebuffersizefun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_fbsize
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup window
 */
GLFWAPI GLFWframebuffersizefun glfwSetFramebufferSizeCallback(GLFWwindow* window, GLFWframebuffersizefun callback);

/*! @brief Sets the window content scale callback for the specified window.
 *
 *  This function sets the window content scale callback of the specified window,
 *  which is called when the content scale of the specified window changes.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, float xscale, float yscale)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWwindowcontentscalefun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref window_scale
 *  @sa @ref glfwGetWindowContentScale
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup window
 */
GLFWAPI GLFWwindowcontentscalefun glfwSetWindowContentScaleCallback(GLFWwindow* window, GLFWwindowcontentscalefun callback);

/*! @brief Processes all pending events.
 *
 *  This function processes only those events that are already in the event
 *  queue and then returns immediately.  Processing events will cause the window
 *  and input callbacks associated with those events to be called.
 *
 *  On some platforms, a window move, resize or menu operation will cause event
 *  processing to block.  This is due to how event processing is designed on
 *  those platforms.  You can use the
 *  [window refresh callback](@ref window_refresh) to redraw the contents of
 *  your window when necessary during such operations.
 *
 *  Do not assume that callbacks you set will _only_ be called in response to
 *  event processing functions like this one.  While it is necessary to poll for
 *  events, window systems that require GLFW to register callbacks of its own
 *  can pass events to GLFW in response to many window system function calls.
 *  GLFW will pass those events on to the application callbacks before
 *  returning.
 *
 *  Event processing is not required for joystick input to work.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @reentrancy This function must not be called from a callback.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref events
 *  @sa @ref glfwWaitEvents
 *  @sa @ref glfwWaitEventsTimeout
 *
 *  @since Added in version 1.0.
 *
 *  @ingroup window
 */
GLFWAPI void glfwPollEvents(void);

/*! @brief Waits until events are queued and processes them.
 *
 *  This function puts the calling thread to sleep until at least one event is
 *  available in the event queue.  Once one or more events are available,
 *  it behaves exactly like @ref glfwPollEvents, i.e. the events in the queue
 *  are processed and the function then returns immediately.  Processing events
 *  will cause the window and input callbacks associated with those events to be
 *  called.
 *
 *  Since not all events are associated with callbacks, this function may return
 *  without a callback having been called even if you are monitoring all
 *  callbacks.
 *
 *  On some platforms, a window move, resize or menu operation will cause event
 *  processing to block.  This is due to how event processing is designed on
 *  those platforms.  You can use the
 *  [window refresh callback](@ref window_refresh) to redraw the contents of
 *  your window when necessary during such operations.
 *
 *  Do not assume that callbacks you set will _only_ be called in response to
 *  event processing functions like this one.  While it is necessary to poll for
 *  events, window systems that require GLFW to register callbacks of its own
 *  can pass events to GLFW in response to many window system function calls.
 *  GLFW will pass those events on to the application callbacks before
 *  returning.
 *
 *  Event processing is not required for joystick input to work.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @reentrancy This function must not be called from a callback.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref events
 *  @sa @ref glfwPollEvents
 *  @sa @ref glfwWaitEventsTimeout
 *
 *  @since Added in version 2.5.
 *
 *  @ingroup window
 */
GLFWAPI void glfwWaitEvents(void);

/*! @brief Waits with timeout until events are queued and processes them.
 *
 *  This function puts the calling thread to sleep until at least one event is
 *  available in the event queue, or until the specified timeout is reached.  If
 *  one or more events are available, it behaves exactly like @ref
 *  glfwPollEvents, i.e. the events in the queue are processed and the function
 *  then returns immediately.  Processing events will cause the window and input
 *  callbacks associated with those events to be called.
 *
 *  The timeout value must be a positive finite number.
 *
 *  Since not all events are associated with callbacks, this function may return
 *  without a callback having been called even if you are monitoring all
 *  callbacks.
 *
 *  On some platforms, a window move, resize or menu operation will cause event
 *  processing to block.  This is due to how event processing is designed on
 *  those platforms.  You can use the
 *  [window refresh callback](@ref window_refresh) to redraw the contents of
 *  your window when necessary during such operations.
 *
 *  Do not assume that callbacks you set will _only_ be called in response to
 *  event processing functions like this one.  While it is necessary to poll for
 *  events, window systems that require GLFW to register callbacks of its own
 *  can pass events to GLFW in response to many window system function calls.
 *  GLFW will pass those events on to the application callbacks before
 *  returning.
 *
 *  Event processing is not required for joystick input to work.
 *
 *  @param[in] timeout The maximum amount of time, in seconds, to wait.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_VALUE and @ref GLFW_PLATFORM_ERROR.
 *
 *  @reentrancy This function must not be called from a callback.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref events
 *  @sa @ref glfwPollEvents
 *  @sa @ref glfwWaitEvents
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup window
 */
GLFWAPI void glfwWaitEventsTimeout(double timeout);

/*! @brief Posts an empty event to the event queue.
 *
 *  This function posts an empty event from the current thread to the event
 *  queue, causing @ref glfwWaitEvents or @ref glfwWaitEventsTimeout to return.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref events
 *  @sa @ref glfwWaitEvents
 *  @sa @ref glfwWaitEventsTimeout
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup window
 */
GLFWAPI void glfwPostEmptyEvent(void);

/*! @brief Returns the value of an input option for the specified window.
 *
 *  This function returns the value of an input option for the specified window.
 *  The mode must be one of @ref GLFW_CURSOR, @ref GLFW_STICKY_KEYS,
 *  @ref GLFW_STICKY_MOUSE_BUTTONS, @ref GLFW_LOCK_KEY_MODS or
 *  @ref GLFW_RAW_MOUSE_MOTION.
 *
 *  @param[in] window The window to query.
 *  @param[in] mode One of `GLFW_CURSOR`, `GLFW_STICKY_KEYS`,
 *  `GLFW_STICKY_MOUSE_BUTTONS`, `GLFW_LOCK_KEY_MODS` or
 *  `GLFW_RAW_MOUSE_MOTION`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_ENUM.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref glfwSetInputMode
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup input
 */
GLFWAPI int glfwGetInputMode(GLFWwindow* window, int mode);

/*! @brief Sets an input option for the specified window.
 *
 *  This function sets an input mode option for the specified window.  The mode
 *  must be one of @ref GLFW_CURSOR, @ref GLFW_STICKY_KEYS,
 *  @ref GLFW_STICKY_MOUSE_BUTTONS, @ref GLFW_LOCK_KEY_MODS or
 *  @ref GLFW_RAW_MOUSE_MOTION.
 *
 *  If the mode is `GLFW_CURSOR`, the value must be one of the following cursor
 *  modes:
 *  - `GLFW_CURSOR_NORMAL` makes the cursor visible and behaving normally.
 *  - `GLFW_CURSOR_HIDDEN` makes the cursor invisible when it is over the
 *    content area of the window but does not restrict the cursor from leaving.
 *  - `GLFW_CURSOR_DISABLED` hides and grabs the cursor, providing virtual
 *    and unlimited cursor movement.  This is useful for implementing for
 *    example 3D camera controls.
 *
 *  If the mode is `GLFW_STICKY_KEYS`, the value must be either `GLFW_TRUE` to
 *  enable sticky keys, or `GLFW_FALSE` to disable it.  If sticky keys are
 *  enabled, a key press will ensure that @ref glfwGetKey returns `GLFW_PRESS`
 *  the next time it is called even if the key had been released before the
 *  call.  This is useful when you are only interested in whether keys have been
 *  pressed but not when or in which order.
 *
 *  If the mode is `GLFW_STICKY_MOUSE_BUTTONS`, the value must be either
 *  `GLFW_TRUE` to enable sticky mouse buttons, or `GLFW_FALSE` to disable it.
 *  If sticky mouse buttons are enabled, a mouse button press will ensure that
 *  @ref glfwGetMouseButton returns `GLFW_PRESS` the next time it is called even
 *  if the mouse button had been released before the call.  This is useful when
 *  you are only interested in whether mouse buttons have been pressed but not
 *  when or in which order.
 *
 *  If the mode is `GLFW_LOCK_KEY_MODS`, the value must be either `GLFW_TRUE` to
 *  enable lock key modifier bits, or `GLFW_FALSE` to disable them.  If enabled,
 *  callbacks that receive modifier bits will also have the @ref
 *  GLFW_MOD_CAPS_LOCK bit set when the event was generated with Caps Lock on,
 *  and the @ref GLFW_MOD_NUM_LOCK bit when Num Lock was on.
 *
 *  If the mode is `GLFW_RAW_MOUSE_MOTION`, the value must be either `GLFW_TRUE`
 *  to enable raw (unscaled and unaccelerated) mouse motion when the cursor is
 *  disabled, or `GLFW_FALSE` to disable it.  If raw motion is not supported,
 *  attempting to set this will emit @ref GLFW_PLATFORM_ERROR.  Call @ref
 *  glfwRawMouseMotionSupported to check for support.
 *
 *  @param[in] window The window whose input mode to set.
 *  @param[in] mode One of `GLFW_CURSOR`, `GLFW_STICKY_KEYS`,
 *  `GLFW_STICKY_MOUSE_BUTTONS`, `GLFW_LOCK_KEY_MODS` or
 *  `GLFW_RAW_MOUSE_MOTION`.
 *  @param[in] value The new value of the specified input mode.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref glfwGetInputMode
 *
 *  @since Added in version 3.0.  Replaces `glfwEnable` and `glfwDisable`.
 *
 *  @ingroup input
 */
GLFWAPI void glfwSetInputMode(GLFWwindow* window, int mode, int value);

/*! @brief Returns whether raw mouse motion is supported.
 *
 *  This function returns whether raw mouse motion is supported on the current
 *  system.  This status does not change after GLFW has been initialized so you
 *  only need to check this once.  If you attempt to enable raw motion on
 *  a system that does not support it, @ref GLFW_PLATFORM_ERROR will be emitted.
 *
 *  Raw mouse motion is closer to the actual motion of the mouse across
 *  a surface.  It is not affected by the scaling and acceleration applied to
 *  the motion of the desktop cursor.  That processing is suitable for a cursor
 *  while raw motion is better for controlling for example a 3D camera.  Because
 *  of this, raw mouse motion is only provided when the cursor is disabled.
 *
 *  @return `GLFW_TRUE` if raw mouse motion is supported on the current machine,
 *  or `GLFW_FALSE` otherwise.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref raw_mouse_motion
 *  @sa @ref glfwSetInputMode
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI int glfwRawMouseMotionSupported(void);

/*! @brief Returns the layout-specific name of the specified printable key.
 *
 *  This function returns the name of the specified printable key, encoded as
 *  UTF-8.  This is typically the character that key would produce without any
 *  modifier keys, intended for displaying key bindings to the user.  For dead
 *  keys, it is typically the diacritic it would add to a character.
 *
 *  __Do not use this function__ for [text input](@ref input_char).  You will
 *  break text input for many languages even if it happens to work for yours.
 *
 *  If the key is `GLFW_KEY_UNKNOWN`, the scancode is used to identify the key,
 *  otherwise the scancode is ignored.  If you specify a non-printable key, or
 *  `GLFW_KEY_UNKNOWN` and a scancode that maps to a non-printable key, this
 *  function returns `NULL` but does not emit an error.
 *
 *  This behavior allows you to always pass in the arguments in the
 *  [key callback](@ref input_key) without modification.
 *
 *  The printable keys are:
 *  - `GLFW_KEY_APOSTROPHE`
 *  - `GLFW_KEY_COMMA`
 *  - `GLFW_KEY_MINUS`
 *  - `GLFW_KEY_PERIOD`
 *  - `GLFW_KEY_SLASH`
 *  - `GLFW_KEY_SEMICOLON`
 *  - `GLFW_KEY_EQUAL`
 *  - `GLFW_KEY_LEFT_BRACKET`
 *  - `GLFW_KEY_RIGHT_BRACKET`
 *  - `GLFW_KEY_BACKSLASH`
 *  - `GLFW_KEY_WORLD_1`
 *  - `GLFW_KEY_WORLD_2`
 *  - `GLFW_KEY_0` to `GLFW_KEY_9`
 *  - `GLFW_KEY_A` to `GLFW_KEY_Z`
 *  - `GLFW_KEY_KP_0` to `GLFW_KEY_KP_9`
 *  - `GLFW_KEY_KP_DECIMAL`
 *  - `GLFW_KEY_KP_DIVIDE`
 *  - `GLFW_KEY_KP_MULTIPLY`
 *  - `GLFW_KEY_KP_SUBTRACT`
 *  - `GLFW_KEY_KP_ADD`
 *  - `GLFW_KEY_KP_EQUAL`
 *
 *  Names for printable keys depend on keyboard layout, while names for
 *  non-printable keys are the same across layouts but depend on the application
 *  language and should be localized along with other user interface text.
 *
 *  The contents of the returned string may change when a keyboard
 *  layout change event is received.  Set a
 *  [keyboard layout](@ref keyboard_layout) callback to be notified when the
 *  layout changes.
 *
 *  @param[in] key The key to query, or `GLFW_KEY_UNKNOWN`.
 *  @param[in] scancode The scancode of the key to query.
 *  @return The UTF-8 encoded, layout-specific name of the key, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned string is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref input_key_name
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup input
 */
GLFWAPI const char* glfwGetKeyName(int key, int scancode);

/*! @brief Returns the platform-specific scancode of the specified key.
 *
 *  This function returns the platform-specific scancode of the specified key.
 *
 *  If the key is `GLFW_KEY_UNKNOWN` or does not exist on the keyboard this
 *  method will return `-1`.
 *
 *  @param[in] key Any [named key](@ref keys).
 *  @return The platform-specific scancode for the key, or `-1` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref input_key
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI int glfwGetKeyScancode(int key);

/*! @brief Returns the human-readable name of the current keyboard layout.
 *
 *  This function returns the human-readable name, encoded as UTF-8, of the
 *  current keyboard layout.  On some platforms this may not be updated until
 *  one of the application's windows gets input focus.
 *
 *  The keyboard layout name is intended to be shown to the user during text
 *  input, especially in full screen applications.
 *
 *  The name may be localized into the current operating system UI language.  It
 *  is provided by the operating system and may not be identical for a given
 *  layout across platforms.
 *
 *  @return The UTF-8 encoded name of the current keyboard layout, or `NULL` if
 *  an [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_PLATFORM_ERROR and @ref
 *  GLFW_NOT_INITIALIZED.
 *
 *  @pointer_lifetime The returned string is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the next call to this
 *  function or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref keyboard_layout
 *  @sa @ref glfwSetKeyboardLayoutCallback
 *
 *  @since Added in version 3.4.
 *
 *  @ingroup input
 */
GLFWAPI const char* glfwGetKeyboardLayoutName(void);

/*! @brief Sets the keyboard layout callback.
 *
 *  This function sets the keyboard layout callback, which is called when the
 *  keyboard layout is changed.  The name of the current layout is returned by
 *  @ref glfwGetKeyboardLayoutName.
 *
 *  On some platforms the keyboard layout event may not arrive until one of the
 *  application's windows get input focus.  Layout changes may not be reported
 *  while other applications have input focus.
 *
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(void)
 *  @endcode
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref keyboard_layout
 *  @sa @ref glfwGetKeyboardLayoutName
 *
 *  @since Added in version 3.4.
 *
 *  @ingroup input
 */
GLFWAPI GLFWkeyboardlayoutfun glfwSetKeyboardLayoutCallback(GLFWkeyboardlayoutfun callback);

/*! @brief Returns the last reported state of a keyboard key for the specified
 *  window.
 *
 *  This function returns the last state reported for the specified key to the
 *  specified window.  The returned state is one of `GLFW_PRESS` or
 *  `GLFW_RELEASE`.  The higher-level action `GLFW_REPEAT` is only reported to
 *  the key callback.
 *
 *  If the @ref GLFW_STICKY_KEYS input mode is enabled, this function returns
 *  `GLFW_PRESS` the first time you call it for a key that was pressed, even if
 *  that key has already been released.
 *
 *  The key functions deal with physical keys, with [key tokens](@ref keys)
 *  named after their use on the standard US keyboard layout.  If you want to
 *  input text, use the Unicode character callback instead.
 *
 *  The [modifier key bit masks](@ref mods) are not key tokens and cannot be
 *  used with this function.
 *
 *  __Do not use this function__ to implement [text input](@ref input_char).
 *
 *  @param[in] window The desired window.
 *  @param[in] key The desired [keyboard key](@ref keys).  `GLFW_KEY_UNKNOWN` is
 *  not a valid key for this function.
 *  @return One of `GLFW_PRESS` or `GLFW_RELEASE`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_ENUM.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref input_key
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup input
 */
GLFWAPI int glfwGetKey(GLFWwindow* window, int key);

/*! @brief Returns the last reported state of a mouse button for the specified
 *  window.
 *
 *  This function returns the last state reported for the specified mouse button
 *  to the specified window.  The returned state is one of `GLFW_PRESS` or
 *  `GLFW_RELEASE`.
 *
 *  If the @ref GLFW_STICKY_MOUSE_BUTTONS input mode is enabled, this function
 *  returns `GLFW_PRESS` the first time you call it for a mouse button that was
 *  pressed, even if that mouse button has already been released.
 *
 *  @param[in] window The desired window.
 *  @param[in] button The desired [mouse button](@ref buttons).
 *  @return One of `GLFW_PRESS` or `GLFW_RELEASE`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_ENUM.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref input_mouse_button
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup input
 */
GLFWAPI int glfwGetMouseButton(GLFWwindow* window, int button);

/*! @brief Retrieves the position of the cursor relative to the content area of
 *  the window.
 *
 *  This function returns the position of the cursor, in screen coordinates,
 *  relative to the upper-left corner of the content area of the specified
 *  window.
 *
 *  If the cursor is disabled (with `GLFW_CURSOR_DISABLED`) then the cursor
 *  position is unbounded and limited only by the minimum and maximum values of
 *  a `double`.
 *
 *  The coordinate can be converted to their integer equivalents with the
 *  `floor` function.  Casting directly to an integer type works for positive
 *  coordinates, but fails for negative ones.
 *
 *  Any or all of the position arguments may be `NULL`.  If an error occurs, all
 *  non-`NULL` position arguments will be set to zero.
 *
 *  @param[in] window The desired window.
 *  @param[out] xpos Where to store the cursor x-coordinate, relative to the
 *  left edge of the content area, or `NULL`.
 *  @param[out] ypos Where to store the cursor y-coordinate, relative to the to
 *  top edge of the content area, or `NULL`.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref cursor_pos
 *  @sa @ref glfwSetCursorPos
 *
 *  @since Added in version 3.0.  Replaces `glfwGetMousePos`.
 *
 *  @ingroup input
 */
GLFWAPI void glfwGetCursorPos(GLFWwindow* window, double* xpos, double* ypos);

/*! @brief Sets the position of the cursor, relative to the content area of the
 *  window.
 *
 *  This function sets the position, in screen coordinates, of the cursor
 *  relative to the upper-left corner of the content area of the specified
 *  window.  The window must have input focus.  If the window does not have
 *  input focus when this function is called, it fails silently.
 *
 *  __Do not use this function__ to implement things like camera controls.  GLFW
 *  already provides the `GLFW_CURSOR_DISABLED` cursor mode that hides the
 *  cursor, transparently re-centers it and provides unconstrained cursor
 *  motion.  See @ref glfwSetInputMode for more information.
 *
 *  If the cursor mode is `GLFW_CURSOR_DISABLED` then the cursor position is
 *  unconstrained and limited only by the minimum and maximum values of
 *  a `double`.
 *
 *  @param[in] window The desired window.
 *  @param[in] xpos The desired x-coordinate, relative to the left edge of the
 *  content area.
 *  @param[in] ypos The desired y-coordinate, relative to the top edge of the
 *  content area.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @remark @wayland This function will only work when the cursor mode is
 *  `GLFW_CURSOR_DISABLED`, otherwise it will do nothing.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref cursor_pos
 *  @sa @ref glfwGetCursorPos
 *
 *  @since Added in version 3.0.  Replaces `glfwSetMousePos`.
 *
 *  @ingroup input
 */
GLFWAPI void glfwSetCursorPos(GLFWwindow* window, double xpos, double ypos);

/*! @brief Creates a custom cursor.
 *
 *  Creates a new custom cursor image that can be set for a window with @ref
 *  glfwSetCursor.  The cursor can be destroyed with @ref glfwDestroyCursor.
 *  Any remaining cursors are destroyed by @ref glfwTerminate.
 *
 *  The pixels are 32-bit, little-endian, non-premultiplied RGBA, i.e. eight
 *  bits per channel with the red channel first.  They are arranged canonically
 *  as packed sequential rows, starting from the top-left corner.
 *
 *  The cursor hotspot is specified in pixels, relative to the upper-left corner
 *  of the cursor image.  Like all other coordinate systems in GLFW, the X-axis
 *  points to the right and the Y-axis points down.
 *
 *  @param[in] image The desired cursor image.
 *  @param[in] xhot The desired x-coordinate, in pixels, of the cursor hotspot.
 *  @param[in] yhot The desired y-coordinate, in pixels, of the cursor hotspot.
 *  @return The handle of the created cursor, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The specified image data is copied before this function
 *  returns.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref cursor_object
 *  @sa @ref glfwDestroyCursor
 *  @sa @ref glfwCreateStandardCursor
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
GLFWAPI GLFWcursor* glfwCreateCursor(const GLFWimage* image, int xhot, int yhot);

/*! @brief Creates a cursor with a standard shape.
 *
 *  Returns a cursor with a standard shape, that can be set for a window with
 *  @ref glfwSetCursor.  The images for these cursors come from the system
 *  cursor theme and their exact appearance will vary between platforms.
 *
 *  Most of these shapes are guaranteed to exist on every supported platform but
 *  a few may not be present.  See the table below for details.
 *
 *  Cursor shape                   | Windows | macOS | X11    | Wayland
 *  ------------------------------ | ------- | ----- | ------ | -------
 *  @ref GLFW_ARROW_CURSOR         | Yes     | Yes   | Yes    | Yes
 *  @ref GLFW_IBEAM_CURSOR         | Yes     | Yes   | Yes    | Yes
 *  @ref GLFW_CROSSHAIR_CURSOR     | Yes     | Yes   | Yes    | Yes
 *  @ref GLFW_POINTING_HAND_CURSOR | Yes     | Yes   | Yes    | Yes
 *  @ref GLFW_RESIZE_EW_CURSOR     | Yes     | Yes   | Yes    | Yes
 *  @ref GLFW_RESIZE_NS_CURSOR     | Yes     | Yes   | Yes    | Yes
 *  @ref GLFW_RESIZE_NWSE_CURSOR   | Yes     | Yes<sup>1</sup> | Maybe<sup>2</sup> | Maybe<sup>2</sup>
 *  @ref GLFW_RESIZE_NESW_CURSOR   | Yes     | Yes<sup>1</sup> | Maybe<sup>2</sup> | Maybe<sup>2</sup>
 *  @ref GLFW_RESIZE_ALL_CURSOR    | Yes     | Yes   | Yes    | Yes
 *  @ref GLFW_NOT_ALLOWED_CURSOR   | Yes     | Yes   | Maybe<sup>2</sup> | Maybe<sup>2</sup>
 *
 *  1) This uses a private system API and may fail in the future.
 *
 *  2) This uses a newer standard that not all cursor themes support.
 *
 *  If the requested shape is not available, this function emits a @ref
 *  GLFW_CURSOR_UNAVAILABLE error and returns `NULL`.
 *
 *  @param[in] shape One of the [standard shapes](@ref shapes).
 *  @return A new cursor ready to use or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM, @ref GLFW_CURSOR_UNAVAILABLE and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref cursor_standard
 *  @sa @ref glfwCreateCursor
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
GLFWAPI GLFWcursor* glfwCreateStandardCursor(int shape);

/*! @brief Destroys a cursor.
 *
 *  This function destroys a cursor previously created with @ref
 *  glfwCreateCursor.  Any remaining cursors will be destroyed by @ref
 *  glfwTerminate.
 *
 *  If the specified cursor is current for any window, that window will be
 *  reverted to the default cursor.  This does not affect the cursor mode.
 *
 *  @param[in] cursor The cursor object to destroy.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @reentrancy This function must not be called from a callback.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref cursor_object
 *  @sa @ref glfwCreateCursor
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
GLFWAPI void glfwDestroyCursor(GLFWcursor* cursor);

/*! @brief Sets the cursor for the window.
 *
 *  This function sets the cursor image to be used when the cursor is over the
 *  content area of the specified window.  The set cursor will only be visible
 *  when the [cursor mode](@ref cursor_mode) of the window is
 *  `GLFW_CURSOR_NORMAL`.
 *
 *  On some platforms, the set cursor may not be visible unless the window also
 *  has input focus.
 *
 *  @param[in] window The window to set the cursor for.
 *  @param[in] cursor The cursor to set, or `NULL` to switch back to the default
 *  arrow cursor.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref cursor_object
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
GLFWAPI void glfwSetCursor(GLFWwindow* window, GLFWcursor* cursor);

/*! @brief Sets the key callback.
 *
 *  This function sets the key callback of the specified window, which is called
 *  when a key is pressed, repeated or released.
 *
 *  The key functions deal with physical keys, with layout independent
 *  [key tokens](@ref keys) named after their values in the standard US keyboard
 *  layout.  If you want to input text, use the
 *  [character callback](@ref glfwSetCharCallback) instead.
 *
 *  When a window loses input focus, it will generate synthetic key release
 *  events for all pressed keys.  You can tell these events from user-generated
 *  events by the fact that the synthetic ones are generated after the focus
 *  loss event has been processed, i.e. after the
 *  [window focus callback](@ref glfwSetWindowFocusCallback) has been called.
 *
 *  The scancode of a key is specific to that platform or sometimes even to that
 *  machine.  Scancodes are intended to allow users to bind keys that don't have
 *  a GLFW key token.  Such keys have `key` set to `GLFW_KEY_UNKNOWN`, their
 *  state is not saved and so it cannot be queried with @ref glfwGetKey.
 *
 *  Sometimes GLFW needs to generate synthetic key events, in which case the
 *  scancode may be zero.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new key callback, or `NULL` to remove the currently
 *  set callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int key, int scancode, int action, int mods)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWkeyfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref input_key
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter and return value.
 *
 *  @ingroup input
 */
GLFWAPI GLFWkeyfun glfwSetKeyCallback(GLFWwindow* window, GLFWkeyfun callback);

/*! @brief Sets the Unicode character callback.
 *
 *  This function sets the character callback of the specified window, which is
 *  called when a Unicode character is input.
 *
 *  The character callback is intended for Unicode text input.  As it deals with
 *  characters, it is keyboard layout dependent, whereas the
 *  [key callback](@ref glfwSetKeyCallback) is not.  Characters do not map 1:1
 *  to physical keys, as a key may produce zero, one or more characters.  If you
 *  want to know whether a specific physical key was pressed or released, see
 *  the key callback instead.
 *
 *  The character callback behaves as system text input normally does and will
 *  not be called if modifier keys are held down that would prevent normal text
 *  input on that platform, for example a Super (Command) key on macOS or Alt key
 *  on Windows.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, unsigned int codepoint)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWcharfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref input_char
 *
 *  @since Added in version 2.4.
 *  @glfw3 Added window handle parameter and return value.
 *
 *  @ingroup input
 */
GLFWAPI GLFWcharfun glfwSetCharCallback(GLFWwindow* window, GLFWcharfun callback);

/*! @brief Sets the Unicode character with modifiers callback.
 *
 *  This function sets the character with modifiers callback of the specified
 *  window, which is called when a Unicode character is input regardless of what
 *  modifier keys are used.
 *
 *  The character with modifiers callback is intended for implementing custom
 *  Unicode character input.  For regular Unicode text input, see the
 *  [character callback](@ref glfwSetCharCallback).  Like the character
 *  callback, the character with modifiers callback deals with characters and is
 *  keyboard layout dependent.  Characters do not map 1:1 to physical keys, as
 *  a key may produce zero, one or more characters.  If you want to know whether
 *  a specific physical key was pressed or released, see the
 *  [key callback](@ref glfwSetKeyCallback) instead.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or an
 *  [error](@ref error_handling) occurred.
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, unsigned int codepoint, int mods)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWcharmodsfun).
 *
 *  @deprecated Scheduled for removal in version 4.0.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref input_char
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
GLFWAPI GLFWcharmodsfun glfwSetCharModsCallback(GLFWwindow* window, GLFWcharmodsfun callback);

/*! @brief Sets the mouse button callback.
 *
 *  This function sets the mouse button callback of the specified window, which
 *  is called when a mouse button is pressed or released.
 *
 *  When a window loses input focus, it will generate synthetic mouse button
 *  release events for all pressed mouse buttons.  You can tell these events
 *  from user-generated events by the fact that the synthetic ones are generated
 *  after the focus loss event has been processed, i.e. after the
 *  [window focus callback](@ref glfwSetWindowFocusCallback) has been called.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int button, int action, int mods)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWmousebuttonfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref input_mouse_button
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter and return value.
 *
 *  @ingroup input
 */
GLFWAPI GLFWmousebuttonfun glfwSetMouseButtonCallback(GLFWwindow* window, GLFWmousebuttonfun callback);

/*! @brief Sets the cursor position callback.
 *
 *  This function sets the cursor position callback of the specified window,
 *  which is called when the cursor is moved.  The callback is provided with the
 *  position, in screen coordinates, relative to the upper-left corner of the
 *  content area of the window.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, double xpos, double ypos);
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWcursorposfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref cursor_pos
 *
 *  @since Added in version 3.0.  Replaces `glfwSetMousePosCallback`.
 *
 *  @ingroup input
 */
GLFWAPI GLFWcursorposfun glfwSetCursorPosCallback(GLFWwindow* window, GLFWcursorposfun callback);

/*! @brief Sets the cursor enter/leave callback.
 *
 *  This function sets the cursor boundary crossing callback of the specified
 *  window, which is called when the cursor enters or leaves the content area of
 *  the window.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int entered)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWcursorenterfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref cursor_enter
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup input
 */
GLFWAPI GLFWcursorenterfun glfwSetCursorEnterCallback(GLFWwindow* window, GLFWcursorenterfun callback);

/*! @brief Sets the scroll callback.
 *
 *  This function sets the scroll callback of the specified window, which is
 *  called when a scrolling device is used, such as a mouse wheel or scrolling
 *  area of a touchpad.
 *
 *  The scroll callback receives all scrolling input, like that from a mouse
 *  wheel or a touchpad scrolling area.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new scroll callback, or `NULL` to remove the
 *  currently set callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, double xoffset, double yoffset)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWscrollfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref scrolling
 *
 *  @since Added in version 3.0.  Replaces `glfwSetMouseWheelCallback`.
 *
 *  @ingroup input
 */
GLFWAPI GLFWscrollfun glfwSetScrollCallback(GLFWwindow* window, GLFWscrollfun callback);

/*! @brief Sets the path drop callback.
 *
 *  This function sets the path drop callback of the specified window, which is
 *  called when one or more dragged paths are dropped on the window.
 *
 *  Because the path array and its strings may have been generated specifically
 *  for that event, they are not guaranteed to be valid after the callback has
 *  returned.  If you wish to use them after the callback returns, you need to
 *  make a deep copy.
 *
 *  @param[in] window The window whose callback to set.
 *  @param[in] callback The new file drop callback, or `NULL` to remove the
 *  currently set callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(GLFWwindow* window, int path_count, const char* paths[])
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWdropfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @remark @wayland File drop is currently unimplemented.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref path_drop
 *
 *  @since Added in version 3.1.
 *
 *  @ingroup input
 */
GLFWAPI GLFWdropfun glfwSetDropCallback(GLFWwindow* window, GLFWdropfun callback);

/*! @brief Returns whether the specified joystick is present.
 *
 *  This function returns whether the specified joystick is present.
 *
 *  There is no need to call this function before other functions that accept
 *  a joystick ID, as they all check for presence before performing any other
 *  work.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @return `GLFW_TRUE` if the joystick is present, or `GLFW_FALSE` otherwise.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref joystick
 *
 *  @since Added in version 3.0.  Replaces `glfwGetJoystickParam`.
 *
 *  @ingroup input
 */
GLFWAPI int glfwJoystickPresent(int jid);

/*! @brief Returns the values of all axes of the specified joystick.
 *
 *  This function returns the values of all axes of the specified joystick.
 *  Each element in the array is a value between -1.0 and 1.0.
 *
 *  If the specified joystick is not present this function will return `NULL`
 *  but will not generate an error.  This can be used instead of first calling
 *  @ref glfwJoystickPresent.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @param[out] count Where to store the number of axis values in the returned
 *  array.  This is set to zero if the joystick is not present or an error
 *  occurred.
 *  @return An array of axis values, or `NULL` if the joystick is not present or
 *  an [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned array is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified joystick is
 *  disconnected or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref joystick_axis
 *
 *  @since Added in version 3.0.  Replaces `glfwGetJoystickPos`.
 *
 *  @ingroup input
 */
GLFWAPI const float* glfwGetJoystickAxes(int jid, int* count);

/*! @brief Returns the state of all buttons of the specified joystick.
 *
 *  This function returns the state of all buttons of the specified joystick.
 *  Each element in the array is either `GLFW_PRESS` or `GLFW_RELEASE`.
 *
 *  For backward compatibility with earlier versions that did not have @ref
 *  glfwGetJoystickHats, the button array also includes all hats, each
 *  represented as four buttons.  The hats are in the same order as returned by
 *  __glfwGetJoystickHats__ and are in the order _up_, _right_, _down_ and
 *  _left_.  To disable these extra buttons, set the @ref
 *  GLFW_JOYSTICK_HAT_BUTTONS init hint before initialization.
 *
 *  If the specified joystick is not present this function will return `NULL`
 *  but will not generate an error.  This can be used instead of first calling
 *  @ref glfwJoystickPresent.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @param[out] count Where to store the number of button states in the returned
 *  array.  This is set to zero if the joystick is not present or an error
 *  occurred.
 *  @return An array of button states, or `NULL` if the joystick is not present
 *  or an [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned array is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified joystick is
 *  disconnected or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref joystick_button
 *
 *  @since Added in version 2.2.
 *  @glfw3 Changed to return a dynamic array.
 *
 *  @ingroup input
 */
GLFWAPI const unsigned char* glfwGetJoystickButtons(int jid, int* count);

/*! @brief Returns the state of all hats of the specified joystick.
 *
 *  This function returns the state of all hats of the specified joystick.
 *  Each element in the array is one of the following values:
 *
 *  Name                  | Value
 *  ----                  | -----
 *  `GLFW_HAT_CENTERED`   | 0
 *  `GLFW_HAT_UP`         | 1
 *  `GLFW_HAT_RIGHT`      | 2
 *  `GLFW_HAT_DOWN`       | 4
 *  `GLFW_HAT_LEFT`       | 8
 *  `GLFW_HAT_RIGHT_UP`   | `GLFW_HAT_RIGHT` \| `GLFW_HAT_UP`
 *  `GLFW_HAT_RIGHT_DOWN` | `GLFW_HAT_RIGHT` \| `GLFW_HAT_DOWN`
 *  `GLFW_HAT_LEFT_UP`    | `GLFW_HAT_LEFT` \| `GLFW_HAT_UP`
 *  `GLFW_HAT_LEFT_DOWN`  | `GLFW_HAT_LEFT` \| `GLFW_HAT_DOWN`
 *
 *  The diagonal directions are bitwise combinations of the primary (up, right,
 *  down and left) directions and you can test for these individually by ANDing
 *  it with the corresponding direction.
 *
 *  @code
 *  if (hats[2] & GLFW_HAT_RIGHT)
 *  {
 *      // State of hat 2 could be right-up, right or right-down
 *  }
 *  @endcode
 *
 *  If the specified joystick is not present this function will return `NULL`
 *  but will not generate an error.  This can be used instead of first calling
 *  @ref glfwJoystickPresent.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @param[out] count Where to store the number of hat states in the returned
 *  array.  This is set to zero if the joystick is not present or an error
 *  occurred.
 *  @return An array of hat states, or `NULL` if the joystick is not present
 *  or an [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned array is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified joystick is
 *  disconnected, this function is called again for that joystick or the library
 *  is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref joystick_hat
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI const unsigned char* glfwGetJoystickHats(int jid, int* count);

/*! @brief Returns the name of the specified joystick.
 *
 *  This function returns the name, encoded as UTF-8, of the specified joystick.
 *  The returned string is allocated and freed by GLFW.  You should not free it
 *  yourself.
 *
 *  If the specified joystick is not present this function will return `NULL`
 *  but will not generate an error.  This can be used instead of first calling
 *  @ref glfwJoystickPresent.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @return The UTF-8 encoded name of the joystick, or `NULL` if the joystick
 *  is not present or an [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned string is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified joystick is
 *  disconnected or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref joystick_name
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup input
 */
GLFWAPI const char* glfwGetJoystickName(int jid);

/*! @brief Returns the SDL compatible GUID of the specified joystick.
 *
 *  This function returns the SDL compatible GUID, as a UTF-8 encoded
 *  hexadecimal string, of the specified joystick.  The returned string is
 *  allocated and freed by GLFW.  You should not free it yourself.
 *
 *  The GUID is what connects a joystick to a gamepad mapping.  A connected
 *  joystick will always have a GUID even if there is no gamepad mapping
 *  assigned to it.
 *
 *  If the specified joystick is not present this function will return `NULL`
 *  but will not generate an error.  This can be used instead of first calling
 *  @ref glfwJoystickPresent.
 *
 *  The GUID uses the format introduced in SDL 2.0.5.  This GUID tries to
 *  uniquely identify the make and model of a joystick but does not identify
 *  a specific unit, e.g. all wired Xbox 360 controllers will have the same
 *  GUID on that platform.  The GUID for a unit may vary between platforms
 *  depending on what hardware information the platform specific APIs provide.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @return The UTF-8 encoded GUID of the joystick, or `NULL` if the joystick
 *  is not present or an [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_INVALID_ENUM and @ref GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned string is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified joystick is
 *  disconnected or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref gamepad
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI const char* glfwGetJoystickGUID(int jid);

/*! @brief Sets the user pointer of the specified joystick.
 *
 *  This function sets the user-defined pointer of the specified joystick.  The
 *  current value is retained until the joystick is disconnected.  The initial
 *  value is `NULL`.
 *
 *  This function may be called from the joystick callback, even for a joystick
 *  that is being disconnected.
 *
 *  @param[in] jid The joystick whose pointer to set.
 *  @param[in] pointer The new value.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Access is not
 *  synchronized.
 *
 *  @sa @ref joystick_userptr
 *  @sa @ref glfwGetJoystickUserPointer
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI void glfwSetJoystickUserPointer(int jid, void* pointer);

/*! @brief Returns the user pointer of the specified joystick.
 *
 *  This function returns the current value of the user-defined pointer of the
 *  specified joystick.  The initial value is `NULL`.
 *
 *  This function may be called from the joystick callback, even for a joystick
 *  that is being disconnected.
 *
 *  @param[in] jid The joystick whose pointer to return.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Access is not
 *  synchronized.
 *
 *  @sa @ref joystick_userptr
 *  @sa @ref glfwSetJoystickUserPointer
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI void* glfwGetJoystickUserPointer(int jid);

/*! @brief Returns whether the specified joystick has a gamepad mapping.
 *
 *  This function returns whether the specified joystick is both present and has
 *  a gamepad mapping.
 *
 *  If the specified joystick is present but does not have a gamepad mapping
 *  this function will return `GLFW_FALSE` but will not generate an error.  Call
 *  @ref glfwJoystickPresent to check if a joystick is present regardless of
 *  whether it has a mapping.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @return `GLFW_TRUE` if a joystick is both present and has a gamepad mapping,
 *  or `GLFW_FALSE` otherwise.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_ENUM.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref gamepad
 *  @sa @ref glfwGetGamepadState
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI int glfwJoystickIsGamepad(int jid);

/*! @brief Sets the joystick configuration callback.
 *
 *  This function sets the joystick configuration callback, or removes the
 *  currently set callback.  This is called when a joystick is connected to or
 *  disconnected from the system.
 *
 *  For joystick connection and disconnection events to be delivered on all
 *  platforms, you need to call one of the [event processing](@ref events)
 *  functions.  Joystick disconnection may also be detected and the callback
 *  called by joystick functions.  The function will then return whatever it
 *  returns if the joystick is not present.
 *
 *  @param[in] callback The new callback, or `NULL` to remove the currently set
 *  callback.
 *  @return The previously set callback, or `NULL` if no callback was set or the
 *  library had not been [initialized](@ref intro_init).
 *
 *  @callback_signature
 *  @code
 *  void function_name(int jid, int event)
 *  @endcode
 *  For more information about the callback parameters, see the
 *  [function pointer type](@ref GLFWjoystickfun).
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref joystick_event
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup input
 */
GLFWAPI GLFWjoystickfun glfwSetJoystickCallback(GLFWjoystickfun callback);

/*! @brief Adds the specified SDL_GameControllerDB gamepad mappings.
 *
 *  This function parses the specified ASCII encoded string and updates the
 *  internal list with any gamepad mappings it finds.  This string may
 *  contain either a single gamepad mapping or many mappings separated by
 *  newlines.  The parser supports the full format of the `gamecontrollerdb.txt`
 *  source file including empty lines and comments.
 *
 *  See @ref gamepad_mapping for a description of the format.
 *
 *  If there is already a gamepad mapping for a given GUID in the internal list,
 *  it will be replaced by the one passed to this function.  If the library is
 *  terminated and re-initialized the internal list will revert to the built-in
 *  default.
 *
 *  @param[in] string The string containing the gamepad mappings.
 *  @return `GLFW_TRUE` if successful, or `GLFW_FALSE` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_VALUE.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref gamepad
 *  @sa @ref glfwJoystickIsGamepad
 *  @sa @ref glfwGetGamepadName
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI int glfwUpdateGamepadMappings(const char* string);

/*! @brief Returns the human-readable gamepad name for the specified joystick.
 *
 *  This function returns the human-readable name of the gamepad from the
 *  gamepad mapping assigned to the specified joystick.
 *
 *  If the specified joystick is not present or does not have a gamepad mapping
 *  this function will return `NULL` but will not generate an error.  Call
 *  @ref glfwJoystickPresent to check whether it is present regardless of
 *  whether it has a mapping.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @return The UTF-8 encoded name of the gamepad, or `NULL` if the
 *  joystick is not present, does not have a mapping or an
 *  [error](@ref error_handling) occurred.
 *
 *  @pointer_lifetime The returned string is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the specified joystick is
 *  disconnected, the gamepad mappings are updated or the library is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref gamepad
 *  @sa @ref glfwJoystickIsGamepad
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI const char* glfwGetGamepadName(int jid);

/*! @brief Retrieves the state of the specified joystick remapped as a gamepad.
 *
 *  This function retrieves the state of the specified joystick remapped to
 *  an Xbox-like gamepad.
 *
 *  If the specified joystick is not present or does not have a gamepad mapping
 *  this function will return `GLFW_FALSE` but will not generate an error.  Call
 *  @ref glfwJoystickPresent to check whether it is present regardless of
 *  whether it has a mapping.
 *
 *  The Guide button may not be available for input as it is often hooked by the
 *  system or the Steam client.
 *
 *  Not all devices have all the buttons or axes provided by @ref
 *  GLFWgamepadstate.  Unavailable buttons and axes will always report
 *  `GLFW_RELEASE` and 0.0 respectively.
 *
 *  @param[in] jid The [joystick](@ref joysticks) to query.
 *  @param[out] state The gamepad input state of the joystick.
 *  @return `GLFW_TRUE` if successful, or `GLFW_FALSE` if no joystick is
 *  connected, it has no gamepad mapping or an [error](@ref error_handling)
 *  occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_ENUM.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref gamepad
 *  @sa @ref glfwUpdateGamepadMappings
 *  @sa @ref glfwJoystickIsGamepad
 *
 *  @since Added in version 3.3.
 *
 *  @ingroup input
 */
GLFWAPI int glfwGetGamepadState(int jid, GLFWgamepadstate* state);

/*! @brief Sets the clipboard to the specified string.
 *
 *  This function sets the system clipboard to the specified, UTF-8 encoded
 *  string.
 *
 *  @param[in] window Deprecated.  Any valid window or `NULL`.
 *  @param[in] string A UTF-8 encoded string.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The specified string is copied before this function
 *  returns.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref clipboard
 *  @sa @ref glfwGetClipboardString
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup input
 */
GLFWAPI void glfwSetClipboardString(GLFWwindow* window, const char* string);

/*! @brief Returns the contents of the clipboard as a string.
 *
 *  This function returns the contents of the system clipboard, if it contains
 *  or is convertible to a UTF-8 encoded string.  If the clipboard is empty or
 *  if its contents cannot be converted, `NULL` is returned and a @ref
 *  GLFW_FORMAT_UNAVAILABLE error is generated.
 *
 *  @param[in] window Deprecated.  Any valid window or `NULL`.
 *  @return The contents of the clipboard as a UTF-8 encoded string, or `NULL`
 *  if an [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @pointer_lifetime The returned string is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is valid until the next call to @ref
 *  glfwGetClipboardString or @ref glfwSetClipboardString, or until the library
 *  is terminated.
 *
 *  @thread_safety This function must only be called from the main thread.
 *
 *  @sa @ref clipboard
 *  @sa @ref glfwSetClipboardString
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup input
 */
GLFWAPI const char* glfwGetClipboardString(GLFWwindow* window);

/*! @brief Returns the GLFW time.
 *
 *  This function returns the current GLFW time, in seconds.  Unless the time
 *  has been set using @ref glfwSetTime it measures time elapsed since GLFW was
 *  initialized.
 *
 *  This function and @ref glfwSetTime are helper functions on top of @ref
 *  glfwGetTimerFrequency and @ref glfwGetTimerValue.
 *
 *  The resolution of the timer is system dependent, but is usually on the order
 *  of a few micro- or nanoseconds.  It uses the highest-resolution monotonic
 *  time source on each supported platform.
 *
 *  @return The current time, in seconds, or zero if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.  Reading and
 *  writing of the internal base time is not atomic, so it needs to be
 *  externally synchronized with calls to @ref glfwSetTime.
 *
 *  @sa @ref time
 *
 *  @since Added in version 1.0.
 *
 *  @ingroup input
 */
GLFWAPI double glfwGetTime(void);

/*! @brief Sets the GLFW time.
 *
 *  This function sets the current GLFW time, in seconds.  The value must be
 *  a positive finite number less than or equal to 18446744073.0, which is
 *  approximately 584.5 years.
 *
 *  This function and @ref glfwGetTime are helper functions on top of @ref
 *  glfwGetTimerFrequency and @ref glfwGetTimerValue.
 *
 *  @param[in] time The new value, in seconds.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_INVALID_VALUE.
 *
 *  @remark The upper limit of GLFW time is calculated as
 *  floor((2<sup>64</sup> - 1) / 10<sup>9</sup>) and is due to implementations
 *  storing nanoseconds in 64 bits.  The limit may be increased in the future.
 *
 *  @thread_safety This function may be called from any thread.  Reading and
 *  writing of the internal base time is not atomic, so it needs to be
 *  externally synchronized with calls to @ref glfwGetTime.
 *
 *  @sa @ref time
 *
 *  @since Added in version 2.2.
 *
 *  @ingroup input
 */
GLFWAPI void glfwSetTime(double time);

/*! @brief Returns the current value of the raw timer.
 *
 *  This function returns the current value of the raw timer, measured in
 *  1&nbsp;/&nbsp;frequency seconds.  To get the frequency, call @ref
 *  glfwGetTimerFrequency.
 *
 *  @return The value of the timer, or zero if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref time
 *  @sa @ref glfwGetTimerFrequency
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup input
 */
GLFWAPI uint64_t glfwGetTimerValue(void);

/*! @brief Returns the frequency, in Hz, of the raw timer.
 *
 *  This function returns the frequency, in Hz, of the raw timer.
 *
 *  @return The frequency of the timer, in Hz, or zero if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref time
 *  @sa @ref glfwGetTimerValue
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup input
 */
GLFWAPI uint64_t glfwGetTimerFrequency(void);

/*! @brief Makes the context of the specified window current for the calling
 *  thread.
 *
 *  This function makes the OpenGL or OpenGL ES context of the specified window
 *  current on the calling thread.  A context must only be made current on
 *  a single thread at a time and each thread can have only a single current
 *  context at a time.
 *
 *  When moving a context between threads, you must make it non-current on the
 *  old thread before making it current on the new one.
 *
 *  By default, making a context non-current implicitly forces a pipeline flush.
 *  On machines that support `GL_KHR_context_flush_control`, you can control
 *  whether a context performs this flush by setting the
 *  [GLFW_CONTEXT_RELEASE_BEHAVIOR](@ref GLFW_CONTEXT_RELEASE_BEHAVIOR_hint)
 *  hint.
 *
 *  The specified window must have an OpenGL or OpenGL ES context.  Specifying
 *  a window without a context will generate a @ref GLFW_NO_WINDOW_CONTEXT
 *  error.
 *
 *  @param[in] window The window whose context to make current, or `NULL` to
 *  detach the current context.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_NO_WINDOW_CONTEXT and @ref GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref context_current
 *  @sa @ref glfwGetCurrentContext
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup context
 */
GLFWAPI void glfwMakeContextCurrent(GLFWwindow* window);

/*! @brief Returns the window whose context is current on the calling thread.
 *
 *  This function returns the window whose OpenGL or OpenGL ES context is
 *  current on the calling thread.
 *
 *  @return The window whose context is current, or `NULL` if no window's
 *  context is current.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref context_current
 *  @sa @ref glfwMakeContextCurrent
 *
 *  @since Added in version 3.0.
 *
 *  @ingroup context
 */
GLFWAPI GLFWwindow* glfwGetCurrentContext(void);

/*! @brief Swaps the front and back buffers of the specified window.
 *
 *  This function swaps the front and back buffers of the specified window when
 *  rendering with OpenGL or OpenGL ES.  If the swap interval is greater than
 *  zero, the GPU driver waits the specified number of screen updates before
 *  swapping the buffers.
 *
 *  The specified window must have an OpenGL or OpenGL ES context.  Specifying
 *  a window without a context will generate a @ref GLFW_NO_WINDOW_CONTEXT
 *  error.
 *
 *  This function does not apply to Vulkan.  If you are rendering with Vulkan,
 *  see `vkQueuePresentKHR` instead.
 *
 *  @param[in] window The window whose buffers to swap.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_NO_WINDOW_CONTEXT and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark __EGL:__ The context of the specified window must be current on the
 *  calling thread.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref buffer_swap
 *  @sa @ref glfwSwapInterval
 *
 *  @since Added in version 1.0.
 *  @glfw3 Added window handle parameter.
 *
 *  @ingroup window
 */
GLFWAPI void glfwSwapBuffers(GLFWwindow* window);

/*! @brief Sets the swap interval for the current context.
 *
 *  This function sets the swap interval for the current OpenGL or OpenGL ES
 *  context, i.e. the number of screen updates to wait from the time @ref
 *  glfwSwapBuffers was called before swapping the buffers and returning.  This
 *  is sometimes called _vertical synchronization_, _vertical retrace
 *  synchronization_ or just _vsync_.
 *
 *  A context that supports either of the `WGL_EXT_swap_control_tear` and
 *  `GLX_EXT_swap_control_tear` extensions also accepts _negative_ swap
 *  intervals, which allows the driver to swap immediately even if a frame
 *  arrives a little bit late.  You can check for these extensions with @ref
 *  glfwExtensionSupported.
 *
 *  A context must be current on the calling thread.  Calling this function
 *  without a current context will cause a @ref GLFW_NO_CURRENT_CONTEXT error.
 *
 *  This function does not apply to Vulkan.  If you are rendering with Vulkan,
 *  see the present mode of your swapchain instead.
 *
 *  @param[in] interval The minimum number of screen updates to wait for
 *  until the buffers are swapped by @ref glfwSwapBuffers.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_NO_CURRENT_CONTEXT and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark This function is not called during context creation, leaving the
 *  swap interval set to whatever is the default on that platform.  This is done
 *  because some swap interval extensions used by GLFW do not allow the swap
 *  interval to be reset to zero once it has been set to a non-zero value.
 *
 *  @remark Some GPU drivers do not honor the requested swap interval, either
 *  because of a user setting that overrides the application's request or due to
 *  bugs in the driver.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref buffer_swap
 *  @sa @ref glfwSwapBuffers
 *
 *  @since Added in version 1.0.
 *
 *  @ingroup context
 */
GLFWAPI void glfwSwapInterval(int interval);

/*! @brief Returns whether the specified extension is available.
 *
 *  This function returns whether the specified
 *  [API extension](@ref context_glext) is supported by the current OpenGL or
 *  OpenGL ES context.  It searches both for client API extension and context
 *  creation API extensions.
 *
 *  A context must be current on the calling thread.  Calling this function
 *  without a current context will cause a @ref GLFW_NO_CURRENT_CONTEXT error.
 *
 *  As this functions retrieves and searches one or more extension strings each
 *  call, it is recommended that you cache its results if it is going to be used
 *  frequently.  The extension strings will not change during the lifetime of
 *  a context, so there is no danger in doing this.
 *
 *  This function does not apply to Vulkan.  If you are using Vulkan, see @ref
 *  glfwGetRequiredInstanceExtensions, `vkEnumerateInstanceExtensionProperties`
 *  and `vkEnumerateDeviceExtensionProperties` instead.
 *
 *  @param[in] extension The ASCII encoded name of the extension.
 *  @return `GLFW_TRUE` if the extension is available, or `GLFW_FALSE`
 *  otherwise.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_NO_CURRENT_CONTEXT, @ref GLFW_INVALID_VALUE and @ref
 *  GLFW_PLATFORM_ERROR.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref context_glext
 *  @sa @ref glfwGetProcAddress
 *
 *  @since Added in version 1.0.
 *
 *  @ingroup context
 */
GLFWAPI int glfwExtensionSupported(const char* extension);

/*! @brief Returns the address of the specified function for the current
 *  context.
 *
 *  This function returns the address of the specified OpenGL or OpenGL ES
 *  [core or extension function](@ref context_glext), if it is supported
 *  by the current context.
 *
 *  A context must be current on the calling thread.  Calling this function
 *  without a current context will cause a @ref GLFW_NO_CURRENT_CONTEXT error.
 *
 *  This function does not apply to Vulkan.  If you are rendering with Vulkan,
 *  see @ref glfwGetInstanceProcAddress, `vkGetInstanceProcAddr` and
 *  `vkGetDeviceProcAddr` instead.
 *
 *  @param[in] procname The ASCII encoded name of the function.
 *  @return The address of the function, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_NO_CURRENT_CONTEXT and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark The address of a given function is not guaranteed to be the same
 *  between contexts.
 *
 *  @remark This function may return a non-`NULL` address despite the
 *  associated version or extension not being available.  Always check the
 *  context version or extension string first.
 *
 *  @pointer_lifetime The returned function pointer is valid until the context
 *  is destroyed or the library is terminated.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref context_glext
 *  @sa @ref glfwExtensionSupported
 *
 *  @since Added in version 1.0.
 *
 *  @ingroup context
 */
GLFWAPI GLFWglproc glfwGetProcAddress(const char* procname);

/*! @brief Returns whether the Vulkan loader and an ICD have been found.
 *
 *  This function returns whether the Vulkan loader and any minimally functional
 *  ICD have been found.
 *
 *  The availability of a Vulkan loader and even an ICD does not by itself
 *  guarantee that surface creation or even instance creation is possible.
 *  For example, on Fermi systems Nvidia will install an ICD that provides no
 *  actual Vulkan support.  Call @ref glfwGetRequiredInstanceExtensions to check
 *  whether the extensions necessary for Vulkan surface creation are available
 *  and @ref glfwGetPhysicalDevicePresentationSupport to check whether a queue
 *  family of a physical device supports image presentation.
 *
 *  @return `GLFW_TRUE` if Vulkan is minimally available, or `GLFW_FALSE`
 *  otherwise.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref vulkan_support
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup vulkan
 */
GLFWAPI int glfwVulkanSupported(void);

/*! @brief Returns the Vulkan instance extensions required by GLFW.
 *
 *  This function returns an array of names of Vulkan instance extensions required
 *  by GLFW for creating Vulkan surfaces for GLFW windows.  If successful, the
 *  list will always contain `VK_KHR_surface`, so if you don't require any
 *  additional extensions you can pass this list directly to the
 *  `VkInstanceCreateInfo` struct.
 *
 *  If Vulkan is not available on the machine, this function returns `NULL` and
 *  generates a @ref GLFW_API_UNAVAILABLE error.  Call @ref glfwVulkanSupported
 *  to check whether Vulkan is at least minimally available.
 *
 *  If Vulkan is available but no set of extensions allowing window surface
 *  creation was found, this function returns `NULL`.  You may still use Vulkan
 *  for off-screen rendering and compute work.
 *
 *  @param[out] count Where to store the number of extensions in the returned
 *  array.  This is set to zero if an error occurred.
 *  @return An array of ASCII encoded extension names, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_API_UNAVAILABLE.
 *
 *  @remark Additional extensions may be required by future versions of GLFW.
 *  You should check if any extensions you wish to enable are already in the
 *  returned array, as it is an error to specify an extension more than once in
 *  the `VkInstanceCreateInfo` struct.
 *
 *  @remark @macos This function currently supports either the
 *  `VK_MVK_macos_surface` extension from MoltenVK or `VK_EXT_metal_surface`
 *  extension.
 *
 *  @pointer_lifetime The returned array is allocated and freed by GLFW.  You
 *  should not free it yourself.  It is guaranteed to be valid only until the
 *  library is terminated.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref vulkan_ext
 *  @sa @ref glfwCreateWindowSurface
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup vulkan
 */
GLFWAPI const char** glfwGetRequiredInstanceExtensions(uint32_t* count);

#if defined(VK_VERSION_1_0)

/*! @brief Returns the address of the specified Vulkan instance function.
 *
 *  This function returns the address of the specified Vulkan core or extension
 *  function for the specified instance.  If instance is set to `NULL` it can
 *  return any function exported from the Vulkan loader, including at least the
 *  following functions:
 *
 *  - `vkEnumerateInstanceExtensionProperties`
 *  - `vkEnumerateInstanceLayerProperties`
 *  - `vkCreateInstance`
 *  - `vkGetInstanceProcAddr`
 *
 *  If Vulkan is not available on the machine, this function returns `NULL` and
 *  generates a @ref GLFW_API_UNAVAILABLE error.  Call @ref glfwVulkanSupported
 *  to check whether Vulkan is at least minimally available.
 *
 *  This function is equivalent to calling `vkGetInstanceProcAddr` with
 *  a platform-specific query of the Vulkan loader as a fallback.
 *
 *  @param[in] instance The Vulkan instance to query, or `NULL` to retrieve
 *  functions related to instance creation.
 *  @param[in] procname The ASCII encoded name of the function.
 *  @return The address of the function, or `NULL` if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
 *  GLFW_API_UNAVAILABLE.
 *
 *  @pointer_lifetime The returned function pointer is valid until the library
 *  is terminated.
 *
 *  @thread_safety This function may be called from any thread.
 *
 *  @sa @ref vulkan_proc
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup vulkan
 */
GLFWAPI GLFWvkproc glfwGetInstanceProcAddress(VkInstance instance, const char* procname);

/*! @brief Returns whether the specified queue family can present images.
 *
 *  This function returns whether the specified queue family of the specified
 *  physical device supports presentation to the platform GLFW was built for.
 *
 *  If Vulkan or the required window surface creation instance extensions are
 *  not available on the machine, or if the specified instance was not created
 *  with the required extensions, this function returns `GLFW_FALSE` and
 *  generates a @ref GLFW_API_UNAVAILABLE error.  Call @ref glfwVulkanSupported
 *  to check whether Vulkan is at least minimally available and @ref
 *  glfwGetRequiredInstanceExtensions to check what instance extensions are
 *  required.
 *
 *  @param[in] instance The instance that the physical device belongs to.
 *  @param[in] device The physical device that the queue family belongs to.
 *  @param[in] queuefamily The index of the queue family to query.
 *  @return `GLFW_TRUE` if the queue family supports presentation, or
 *  `GLFW_FALSE` otherwise.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_API_UNAVAILABLE and @ref GLFW_PLATFORM_ERROR.
 *
 *  @remark @macos This function currently always returns `GLFW_TRUE`, as the
 *  `VK_MVK_macos_surface` extension does not provide
 *  a `vkGetPhysicalDevice*PresentationSupport` type function.
 *
 *  @thread_safety This function may be called from any thread.  For
 *  synchronization details of Vulkan objects, see the Vulkan specification.
 *
 *  @sa @ref vulkan_present
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup vulkan
 */
GLFWAPI int glfwGetPhysicalDevicePresentationSupport(VkInstance instance, VkPhysicalDevice device, uint32_t queuefamily);

/*! @brief Creates a Vulkan surface for the specified window.
 *
 *  This function creates a Vulkan surface for the specified window.
 *
 *  If the Vulkan loader or at least one minimally functional ICD were not found,
 *  this function returns `VK_ERROR_INITIALIZATION_FAILED` and generates a @ref
 *  GLFW_API_UNAVAILABLE error.  Call @ref glfwVulkanSupported to check whether
 *  Vulkan is at least minimally available.
 *
 *  If the required window surface creation instance extensions are not
 *  available or if the specified instance was not created with these extensions
 *  enabled, this function returns `VK_ERROR_EXTENSION_NOT_PRESENT` and
 *  generates a @ref GLFW_API_UNAVAILABLE error.  Call @ref
 *  glfwGetRequiredInstanceExtensions to check what instance extensions are
 *  required.
 *
 *  The window surface cannot be shared with another API so the window must
 *  have been created with the [client api hint](@ref GLFW_CLIENT_API_attrib)
 *  set to `GLFW_NO_API` otherwise it generates a @ref GLFW_INVALID_VALUE error
 *  and returns `VK_ERROR_NATIVE_WINDOW_IN_USE_KHR`.
 *
 *  The window surface must be destroyed before the specified Vulkan instance.
 *  It is the responsibility of the caller to destroy the window surface.  GLFW
 *  does not destroy it for you.  Call `vkDestroySurfaceKHR` to destroy the
 *  surface.
 *
 *  @param[in] instance The Vulkan instance to create the surface in.
 *  @param[in] window The window to create the surface for.
 *  @param[in] allocator The allocator to use, or `NULL` to use the default
 *  allocator.
 *  @param[out] surface Where to store the handle of the surface.  This is set
 *  to `VK_NULL_HANDLE` if an error occurred.
 *  @return `VK_SUCCESS` if successful, or a Vulkan error code if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_API_UNAVAILABLE, @ref GLFW_PLATFORM_ERROR and @ref GLFW_INVALID_VALUE
 *
 *  @remark If an error occurs before the creation call is made, GLFW returns
 *  the Vulkan error code most appropriate for the error.  Appropriate use of
 *  @ref glfwVulkanSupported and @ref glfwGetRequiredInstanceExtensions should
 *  eliminate almost all occurrences of these errors.
 *
 *  @remark @macos This function currently only supports the
 *  `VK_MVK_macos_surface` extension from MoltenVK.
 *
 *  @remark @macos This function creates and sets a `CAMetalLayer` instance for
 *  the window content view, which is required for MoltenVK to function.
 *
 *  @thread_safety This function may be called from any thread.  For
 *  synchronization details of Vulkan objects, see the Vulkan specification.
 *
 *  @sa @ref vulkan_surface
 *  @sa @ref glfwGetRequiredInstanceExtensions
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup vulkan
 */
GLFWAPI VkResult glfwCreateWindowSurface(VkInstance instance, GLFWwindow* window, const VkAllocationCallbacks* allocator, VkSurfaceKHR* surface);

#endif /*VK_VERSION_1_0*/


/*************************************************************************
 * Global definition cleanup
 *************************************************************************/

/* ------------------- BEGIN SYSTEM/COMPILER SPECIFIC -------------------- */

#ifdef GLFW_WINGDIAPI_DEFINED
 #undef WINGDIAPI
 #undef GLFW_WINGDIAPI_DEFINED
#endif

#ifdef GLFW_CALLBACK_DEFINED
 #undef CALLBACK
 #undef GLFW_CALLBACK_DEFINED
#endif

/* Some OpenGL related headers need GLAPIENTRY, but it is unconditionally
 * defined by some gl.h variants (OpenBSD) so define it after if needed.
 */
#ifndef GLAPIENTRY
 #define GLAPIENTRY APIENTRY
#endif

/* -------------------- END SYSTEM/COMPILER SPECIFIC --------------------- */


#ifdef __cplusplus
}
#endif

#endif /* _glfw3_h_ */