Description

This is the reference documentation for input related functions and types. For more task-oriented information, see the Input guide.

Modules
	Gamepad axes
	Gamepad axes.

	Gamepad buttons
	Gamepad buttons.

	Joystick hat states
	Joystick hat states.

	Joysticks
	Joystick IDs.

	Keyboard keys
	Keyboard key IDs.

	Modifier key flags
	Modifier key flags.

	Mouse buttons
	Mouse button IDs.

	Standard cursor shapes
	Standard system cursor shapes.

Typedefs
typedef struct GLFWcursor	GLFWcursor
	Opaque cursor object. More...

typedef void(*	GLFWmousebuttonfun) (GLFWwindow *, int, int, int)
	The function pointer type for mouse button callbacks. More...

typedef void(*	GLFWcursorposfun) (GLFWwindow *, double, double)
	The function pointer type for cursor position callbacks. More...

typedef void(*	GLFWcursorenterfun) (GLFWwindow *, int)
	The function pointer type for cursor enter/leave callbacks. More...

typedef void(*	GLFWscrollfun) (GLFWwindow *, double, double)
	The function pointer type for scroll callbacks. More...

typedef void(*	GLFWkeyfun) (GLFWwindow *, int, int, int, int)
	The function pointer type for keyboard key callbacks. More...

typedef void(*	GLFWcharfun) (GLFWwindow *, unsigned int)
	The function pointer type for Unicode character callbacks. More...

typedef void(*	GLFWcharmodsfun) (GLFWwindow *, unsigned int, int)
	The function pointer type for Unicode character with modifiers callbacks. More...

typedef void(*	GLFWdropfun) (GLFWwindow , int, const char [])
	The function pointer type for path drop callbacks. More...

typedef void(*	GLFWjoystickfun) (int, int)
	The function pointer type for joystick configuration callbacks. More...

typedef struct GLFWgamepadstate	GLFWgamepadstate
	Gamepad input state. More...

Functions
int	glfwGetInputMode (GLFWwindow *window, int mode)
	Returns the value of an input option for the specified window. More...

void	glfwSetInputMode (GLFWwindow *window, int mode, int value)
	Sets an input option for the specified window. More...

int	glfwRawMouseMotionSupported (void)
	Returns whether raw mouse motion is supported. More...

const char *	glfwGetKeyName (int key, int scancode)
	Returns the layout-specific name of the specified printable key. More...

int	glfwGetKeyScancode (int key)
	Returns the platform-specific scancode of the specified key. More...

int	glfwGetKey (GLFWwindow *window, int key)
	Returns the last reported state of a keyboard key for the specified window. More...

int	glfwGetMouseButton (GLFWwindow *window, int button)
	Returns the last reported state of a mouse button for the specified window. More...

void	glfwGetCursorPos (GLFWwindow window, double xpos, double *ypos)
	Retrieves the position of the cursor relative to the content area of the window. More...

void	glfwSetCursorPos (GLFWwindow *window, double xpos, double ypos)
	Sets the position of the cursor, relative to the content area of the window. More...

GLFWcursor *	glfwCreateCursor (const GLFWimage *image, int xhot, int yhot)
	Creates a custom cursor. More...

GLFWcursor *	glfwCreateStandardCursor (int shape)
	Creates a cursor with a standard shape. More...

void	glfwDestroyCursor (GLFWcursor *cursor)
	Destroys a cursor. More...

void	glfwSetCursor (GLFWwindow window, GLFWcursor cursor)
	Sets the cursor for the window. More...

GLFWkeyfun	glfwSetKeyCallback (GLFWwindow *window, GLFWkeyfun callback)
	Sets the key callback. More...

GLFWcharfun	glfwSetCharCallback (GLFWwindow *window, GLFWcharfun callback)
	Sets the Unicode character callback. More...

GLFWcharmodsfun	glfwSetCharModsCallback (GLFWwindow *window, GLFWcharmodsfun callback)
	Sets the Unicode character with modifiers callback. More...

GLFWmousebuttonfun	glfwSetMouseButtonCallback (GLFWwindow *window, GLFWmousebuttonfun callback)
	Sets the mouse button callback. More...

GLFWcursorposfun	glfwSetCursorPosCallback (GLFWwindow *window, GLFWcursorposfun callback)
	Sets the cursor position callback. More...

GLFWcursorenterfun	glfwSetCursorEnterCallback (GLFWwindow *window, GLFWcursorenterfun callback)
	Sets the cursor enter/leave callback. More...

GLFWscrollfun	glfwSetScrollCallback (GLFWwindow *window, GLFWscrollfun callback)
	Sets the scroll callback. More...

GLFWdropfun	glfwSetDropCallback (GLFWwindow *window, GLFWdropfun callback)
	Sets the path drop callback. More...

int	glfwJoystickPresent (int jid)
	Returns whether the specified joystick is present. More...

const float *	glfwGetJoystickAxes (int jid, int *count)
	Returns the values of all axes of the specified joystick. More...

const unsigned char *	glfwGetJoystickButtons (int jid, int *count)
	Returns the state of all buttons of the specified joystick. More...

const unsigned char *	glfwGetJoystickHats (int jid, int *count)
	Returns the state of all hats of the specified joystick. More...

const char *	glfwGetJoystickName (int jid)
	Returns the name of the specified joystick. More...

const char *	glfwGetJoystickGUID (int jid)
	Returns the SDL compatible GUID of the specified joystick. More...

void	glfwSetJoystickUserPointer (int jid, void *pointer)
	Sets the user pointer of the specified joystick. More...

void *	glfwGetJoystickUserPointer (int jid)
	Returns the user pointer of the specified joystick. More...

int	glfwJoystickIsGamepad (int jid)
	Returns whether the specified joystick has a gamepad mapping. More...

GLFWjoystickfun	glfwSetJoystickCallback (GLFWjoystickfun callback)
	Sets the joystick configuration callback. More...

int	glfwUpdateGamepadMappings (const char *string)
	Adds the specified SDL_GameControllerDB gamepad mappings. More...

const char *	glfwGetGamepadName (int jid)
	Returns the human-readable gamepad name for the specified joystick. More...

int	glfwGetGamepadState (int jid, GLFWgamepadstate *state)
	Retrieves the state of the specified joystick remapped as a gamepad. More...

void	glfwSetClipboardString (GLFWwindow window, const char string)
	Sets the clipboard to the specified string. More...

const char *	glfwGetClipboardString (GLFWwindow *window)
	Returns the contents of the clipboard as a string. More...

double	glfwGetTime (void)
	Returns the GLFW time. More...

void	glfwSetTime (double time)
	Sets the GLFW time. More...

uint64_t	glfwGetTimerValue (void)
	Returns the current value of the raw timer. More...

uint64_t	glfwGetTimerFrequency (void)
	Returns the frequency, in Hz, of the raw timer. More...

Macro Definition Documentation

◆ GLFW_RELEASE

#define GLFW_RELEASE 0

The key or mouse button was released.

◆ GLFW_PRESS

#define GLFW_PRESS 1

The key or mouse button was pressed.

◆ GLFW_REPEAT

#define GLFW_REPEAT 2

The key was held down until it repeated.

Typedef Documentation

◆ GLFWcursor

typedef struct GLFWcursor GLFWcursor

Opaque cursor object.

See also: Cursor objects

Since: Added in version 3.1.

◆ GLFWmousebuttonfun

typedef void(* GLFWmousebuttonfun) (GLFWwindow *, int, int, int)

This is the function pointer type for mouse button callback functions. A mouse button callback function has the following signature:

void function_name(GLFWwindow* window, int button, int action, int mods)

Parameters

[in]	window	The window that received the event.
[in]	button	The mouse button that was pressed or released.
[in]	action	One of `GLFW_PRESS` or `GLFW_RELEASE`. Future releases may add more actions.
[in]	mods	Bit field describing which modifier keys were held down.

See also: Mouse button input; glfwSetMouseButtonCallback

Since: Added in version 1.0. GLFW 3: Added window handle and modifier mask parameters.

◆ GLFWcursorposfun

typedef void(* GLFWcursorposfun) (GLFWwindow *, double, double)

This is the function pointer type for cursor position callbacks. A cursor position callback function has the following signature:

void function_name(GLFWwindow* window, double xpos, double ypos);

Parameters

[in]	window	The window that received the event.
[in]	xpos	The new cursor x-coordinate, relative to the left edge of the content area.
[in]	ypos	The new cursor y-coordinate, relative to the top edge of the content area.

See also: Cursor position; glfwSetCursorPosCallback

Since: Added in version 3.0. Replaces GLFWmouseposfun.

◆ GLFWcursorenterfun

typedef void(* GLFWcursorenterfun) (GLFWwindow *, int)

This is the function pointer type for cursor enter/leave callbacks. A cursor enter/leave callback function has the following signature:

void function_name(GLFWwindow* window, int entered)

Parameters

[in]	window	The window that received the event.
[in]	entered	`GLFW_TRUE` if the cursor entered the window's content area, or `GLFW_FALSE` if it left it.

See also: Cursor enter/leave events; glfwSetCursorEnterCallback

Since: Added in version 3.0.

◆ GLFWscrollfun

typedef void(* GLFWscrollfun) (GLFWwindow *, double, double)

This is the function pointer type for scroll callbacks. A scroll callback function has the following signature:

void function_name(GLFWwindow* window, double xoffset, double yoffset)

Parameters

[in]	window	The window that received the event.
[in]	xoffset	The scroll offset along the x-axis.
[in]	yoffset	The scroll offset along the y-axis.

See also: Scroll input; glfwSetScrollCallback

Since: Added in version 3.0. Replaces GLFWmousewheelfun.

◆ GLFWkeyfun

typedef void(* GLFWkeyfun) (GLFWwindow *, int, int, int, int)

This is the function pointer type for keyboard key callbacks. A keyboard key callback function has the following signature:

void function_name(GLFWwindow* window, int key, int scancode, int action, int mods)

Parameters

[in]	window	The window that received the event.
[in]	key	The keyboard key that was pressed or released.
[in]	scancode	The system-specific scancode of the key.
[in]	action	`GLFW_PRESS`, `GLFW_RELEASE` or `GLFW_REPEAT`. Future releases may add more actions.
[in]	mods	Bit field describing which modifier keys were held down.

See also: Key input; glfwSetKeyCallback

Since: Added in version 1.0. GLFW 3: Added window handle, scancode and modifier mask parameters.

◆ GLFWcharfun

typedef void(* GLFWcharfun) (GLFWwindow *, unsigned int)

This is the function pointer type for Unicode character callbacks. A Unicode character callback function has the following signature:

void function_name(GLFWwindow* window, unsigned int codepoint)

Parameters

[in]	window	The window that received the event.
[in]	codepoint	The Unicode code point of the character.

See also: Text input; glfwSetCharCallback

Since: Added in version 2.4. GLFW 3: Added window handle parameter.

◆ GLFWcharmodsfun

typedef void(* GLFWcharmodsfun) (GLFWwindow *, unsigned int, int)

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:

void function_name(GLFWwindow* window, unsigned int codepoint, int mods)

Parameters

[in]	window	The window that received the event.
[in]	codepoint	The Unicode code point of the character.
[in]	mods	Bit field describing which modifier keys were held down.

See also: Text input; glfwSetCharModsCallback

Deprecated:: Scheduled for removal in version 4.0.

Since: Added in version 3.1.

◆ GLFWdropfun

typedef void(* GLFWdropfun) (GLFWwindow *, int, const char *[])

This is the function pointer type for path drop callbacks. A path drop callback function has the following signature:

void function_name(GLFWwindow* window, int path_count, const char* paths[])

Parameters

[in]	window	The window that received the event.
[in]	path_count	The number of dropped paths.
[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.

See also: Path drop input; glfwSetDropCallback

Since: Added in version 3.1.

◆ GLFWjoystickfun

typedef void(* GLFWjoystickfun) (int, int)

This is the function pointer type for joystick configuration callbacks. A joystick configuration callback function has the following signature:

void function_name(int jid, int event)

Parameters

[in]	jid	The joystick that was connected or disconnected.
[in]	event	One of `GLFW_CONNECTED` or `GLFW_DISCONNECTED`. Future releases may add more events.

See also: Joystick configuration changes; glfwSetJoystickCallback

Since: Added in version 3.2.

◆ GLFWgamepadstate

typedef struct GLFWgamepadstate GLFWgamepadstate

This describes the input state of a gamepad.

See also: Gamepad input; glfwGetGamepadState

Since: Added in version 3.3.

Function Documentation

◆ glfwGetInputMode()

int glfwGetInputMode	(	GLFWwindow *	window,
		int	mode
	)

This function returns the value of an input option for the specified window. The mode must be one of GLFW_CURSOR, GLFW_STICKY_KEYS, GLFW_STICKY_MOUSE_BUTTONS, GLFW_LOCK_KEY_MODS or GLFW_RAW_MOUSE_MOTION.

Parameters

[in]	window	The window to query.
[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 GLFW_NOT_INITIALIZED and GLFW_INVALID_ENUM.

Thread safety: This function must only be called from the main thread.

See also: glfwSetInputMode

Since: Added in version 3.0.

◆ glfwSetInputMode()

void glfwSetInputMode	(	GLFWwindow *	window,
		int	mode,
		int	value
	)

This function sets an input mode option for the specified window. The mode must be one of GLFW_CURSOR, GLFW_STICKY_KEYS, GLFW_STICKY_MOUSE_BUTTONS, GLFW_LOCK_KEY_MODS or 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 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 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 GLFW_MOD_CAPS_LOCK bit set when the event was generated with Caps Lock on, and the 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 GLFW_PLATFORM_ERROR. Call glfwRawMouseMotionSupported to check for support.

Parameters

[in]	window	The window whose input mode to set.
[in]	mode	One of `GLFW_CURSOR`, `GLFW_STICKY_KEYS`, `GLFW_STICKY_MOUSE_BUTTONS`, `GLFW_LOCK_KEY_MODS` or `GLFW_RAW_MOUSE_MOTION`.
[in]	value	The new value of the specified input mode.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and GLFW_PLATFORM_ERROR.

Thread safety: This function must only be called from the main thread.

See also: glfwGetInputMode

Since: Added in version 3.0. Replaces glfwEnable and glfwDisable.

◆ glfwRawMouseMotionSupported()

int glfwRawMouseMotionSupported ( void )

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, 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.

Returns: GLFW_TRUE if raw mouse motion is supported on the current machine, or GLFW_FALSE otherwise.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Raw mouse motion; glfwSetInputMode

Since: Added in version 3.3.

◆ glfwGetKeyName()

const char* glfwGetKeyName	(	int	key,
		int	scancode
	)

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. 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 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.

Parameters

[in]	key	The key to query, or `GLFW_KEY_UNKNOWN`.
[in]	scancode	The scancode of the key to query.

Returns: The UTF-8 encoded, layout-specific name of the key, or NULL.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_PLATFORM_ERROR.

Remarks: The contents of the returned string may change when a keyboard layout change event is received.

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.

See also: Key names

Since: Added in version 3.2.

◆ glfwGetKeyScancode()

int glfwGetKeyScancode ( int 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.

Parameters

[in] key Any named key.

Returns: The platform-specific scancode for the key, or -1 if an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and GLFW_PLATFORM_ERROR.

Thread safety: This function may be called from any thread.

See also: Key input

Since: Added in version 3.3.

◆ glfwGetKey()

int glfwGetKey	(	GLFWwindow *	window,
		int	key
	)

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 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 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 are not key tokens and cannot be used with this function.

Do not use this function to implement text input.

Parameters

[in]	window	The desired window.
[in]	key	The desired keyboard key. `GLFW_KEY_UNKNOWN` is not a valid key for this function.

Returns: One of GLFW_PRESS or GLFW_RELEASE.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_INVALID_ENUM.

Thread safety: This function must only be called from the main thread.

See also: Key input

Since: Added in version 1.0. GLFW 3: Added window handle parameter.

◆ glfwGetMouseButton()

int glfwGetMouseButton	(	GLFWwindow *	window,
		int	button
	)

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 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.

Parameters

[in]	window	The desired window.
[in]	button	The desired mouse button.

Returns: One of GLFW_PRESS or GLFW_RELEASE.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_INVALID_ENUM.

Thread safety: This function must only be called from the main thread.

See also: Mouse button input

Since: Added in version 1.0. GLFW 3: Added window handle parameter.

◆ glfwGetCursorPos()

void glfwGetCursorPos	(	GLFWwindow *	window,
		double *	xpos,
		double *	ypos
	)

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.

Parameters

[in]	window	The desired window.
[out]	xpos	Where to store the cursor x-coordinate, relative to the left edge of the content area, or `NULL`.
[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 GLFW_NOT_INITIALIZED and GLFW_PLATFORM_ERROR.

Thread safety: This function must only be called from the main thread.

See also: Cursor position; glfwSetCursorPos

Since: Added in version 3.0. Replaces glfwGetMousePos.

◆ glfwSetCursorPos()

void glfwSetCursorPos	(	GLFWwindow *	window,
		double	xpos,
		double	ypos
	)

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 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.

Parameters

[in]	window	The desired window.
[in]	xpos	The desired x-coordinate, relative to the left edge of the content area.
[in]	ypos	The desired y-coordinate, relative to the top edge of the content area.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_PLATFORM_ERROR.

Remarks: 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.

See also: Cursor position; glfwGetCursorPos

Since: Added in version 3.0. Replaces glfwSetMousePos.

◆ glfwCreateCursor()

GLFWcursor* glfwCreateCursor	(	const GLFWimage *	image,
		int	xhot,
		int	yhot
	)

Creates a new custom cursor image that can be set for a window with glfwSetCursor. The cursor can be destroyed with glfwDestroyCursor. Any remaining cursors are destroyed by 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.

Parameters

[in]	image	The desired cursor image.
[in]	xhot	The desired x-coordinate, in pixels, of the cursor hotspot.
[in]	yhot	The desired y-coordinate, in pixels, of the cursor hotspot.

Returns: The handle of the created cursor, or NULL if an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED and 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.

See also: Cursor objects; glfwDestroyCursor; glfwCreateStandardCursor

Since: Added in version 3.1.

◆ glfwCreateStandardCursor()

GLFWcursor* glfwCreateStandardCursor ( int shape )

Returns a cursor with a standard shape, that can be set for a window with glfwSetCursor.

Parameters

[in] shape One of the standard shapes.

Returns: A new cursor ready to use or NULL if an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and GLFW_PLATFORM_ERROR.

Thread safety: This function must only be called from the main thread.

See also: Cursor objects; glfwCreateCursor

Since: Added in version 3.1.

◆ glfwDestroyCursor()

void glfwDestroyCursor ( GLFWcursor * cursor )

This function destroys a cursor previously created with glfwCreateCursor. Any remaining cursors will be destroyed by 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.

Parameters

[in] cursor The cursor object to destroy.

Errors: Possible errors include GLFW_NOT_INITIALIZED and 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.

See also: Cursor objects; glfwCreateCursor

Since: Added in version 3.1.

◆ glfwSetCursor()

void glfwSetCursor	(	GLFWwindow *	window,
		GLFWcursor *	cursor
	)

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 of the window is GLFW_CURSOR_NORMAL.

On some platforms, the set cursor may not be visible unless the window also has input focus.

Parameters

[in]	window	The window to set the cursor for.
[in]	cursor	The cursor to set, or `NULL` to switch back to the default arrow cursor.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_PLATFORM_ERROR.

Thread safety: This function must only be called from the main thread.

See also: Cursor objects

Since: Added in version 3.1.

◆ glfwSetKeyCallback()

GLFWkeyfun glfwSetKeyCallback	(	GLFWwindow *	window,
		GLFWkeyfun	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 named after their values in the standard US keyboard layout. If you want to input text, use the character callback 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 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 glfwGetKey.

Sometimes GLFW needs to generate synthetic key events, in which case the scancode may be zero.

Parameters

[in]	window	The window whose callback to set.
[in]	callback	The new key callback, or `NULL` to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or the library had not been initialized.

Callback signature: void function_name(GLFWwindow* window, int key, int scancode, int action, int mods)

For more information about the callback parameters, see the function pointer type.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Key input

Since: Added in version 1.0. GLFW 3: Added window handle parameter and return value.

◆ glfwSetCharCallback()

GLFWcharfun glfwSetCharCallback	(	GLFWwindow *	window,
		GLFWcharfun	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 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.

Parameters

[in]	window	The window whose callback to set.
[in]	callback	The new callback, or `NULL` to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or the library had not been initialized.

Callback signature: void function_name(GLFWwindow* window, unsigned int codepoint)

For more information about the callback parameters, see the function pointer type.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Text input

Since: Added in version 2.4. GLFW 3: Added window handle parameter and return value.

◆ glfwSetCharModsCallback()

GLFWcharmodsfun glfwSetCharModsCallback	(	GLFWwindow *	window,
		GLFWcharmodsfun	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. 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 instead.

Parameters

[in]	window	The window whose callback to set.
[in]	callback	The new callback, or `NULL` to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or an error occurred.

Callback signature: void function_name(GLFWwindow* window, unsigned int codepoint, int mods)

For more information about the callback parameters, see the function pointer type.

Deprecated:: Scheduled for removal in version 4.0.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Text input

Since: Added in version 3.1.

◆ glfwSetMouseButtonCallback()

GLFWmousebuttonfun glfwSetMouseButtonCallback	(	GLFWwindow *	window,
		GLFWmousebuttonfun	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 has been called.

Parameters

[in]	window	The window whose callback to set.
[in]	callback	The new callback, or `NULL` to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or the library had not been initialized.

Callback signature: void function_name(GLFWwindow* window, int button, int action, int mods)

For more information about the callback parameters, see the function pointer type.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Mouse button input

Since: Added in version 1.0. GLFW 3: Added window handle parameter and return value.

◆ glfwSetCursorPosCallback()

GLFWcursorposfun glfwSetCursorPosCallback	(	GLFWwindow *	window,
		GLFWcursorposfun	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.

Parameters

[in]	window	The window whose callback to set.
[in]	callback	The new callback, or `NULL` to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or the library had not been initialized.

Callback signature: void function_name(GLFWwindow* window, double xpos, double ypos);

For more information about the callback parameters, see the function pointer type.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Cursor position

Since: Added in version 3.0. Replaces glfwSetMousePosCallback.

◆ glfwSetCursorEnterCallback()

GLFWcursorenterfun glfwSetCursorEnterCallback	(	GLFWwindow *	window,
		GLFWcursorenterfun	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.

Parameters

[in]	window	The window whose callback to set.
[in]	callback	The new callback, or `NULL` to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or the library had not been initialized.

Callback signature: void function_name(GLFWwindow* window, int entered)

For more information about the callback parameters, see the function pointer type.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Cursor enter/leave events

Since: Added in version 3.0.

◆ glfwSetScrollCallback()

GLFWscrollfun glfwSetScrollCallback	(	GLFWwindow *	window,
		GLFWscrollfun	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.

Parameters

[in]	window	The window whose callback to set.
[in]	callback	The new scroll callback, or `NULL` to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or the library had not been initialized.

Callback signature: void function_name(GLFWwindow* window, double xoffset, double yoffset)

For more information about the callback parameters, see the function pointer type.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Scroll input

Since: Added in version 3.0. Replaces glfwSetMouseWheelCallback.

◆ glfwSetDropCallback()

GLFWdropfun glfwSetDropCallback	(	GLFWwindow *	window,
		GLFWdropfun	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.

Parameters

[in]	window	The window whose callback to set.
[in]	callback	The new file drop callback, or `NULL` to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or the library had not been initialized.

Callback signature: void function_name(GLFWwindow* window, int path_count, const char* paths[])

For more information about the callback parameters, see the function pointer type.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Remarks: Wayland: File drop is currently unimplemented.

Thread safety: This function must only be called from the main thread.

See also: Path drop input

Since: Added in version 3.1.

◆ glfwJoystickPresent()

int glfwJoystickPresent ( int jid )

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.

Parameters

[in] jid The joystick to query.

Returns: GLFW_TRUE if the joystick is present, or GLFW_FALSE otherwise.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and GLFW_PLATFORM_ERROR.

Thread safety: This function must only be called from the main thread.

See also: Joystick input

Since: Added in version 3.0. Replaces glfwGetJoystickParam.

◆ glfwGetJoystickAxes()

const float* glfwGetJoystickAxes	(	int	jid,
		int *	count
	)

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 glfwJoystickPresent.

Parameters

[in]	jid	The joystick to query.
[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.

Returns: An array of axis values, or NULL if the joystick is not present or an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and 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.

See also: Joystick axis states

Since: Added in version 3.0. Replaces glfwGetJoystickPos.

◆ glfwGetJoystickButtons()

const unsigned char* glfwGetJoystickButtons	(	int	jid,
		int *	count
	)

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 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 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 glfwJoystickPresent.

Parameters

[in]	jid	The joystick to query.
[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.

Returns: An array of button states, or NULL if the joystick is not present or an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and 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.

See also: Joystick button states

Since: Added in version 2.2. GLFW 3: Changed to return a dynamic array.

◆ glfwGetJoystickHats()

const unsigned char* glfwGetJoystickHats	(	int	jid,
		int *	count
	)

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.

if (hats[2] & GLFW_HAT_RIGHT)
{
    // State of hat 2 could be right-up, right or right-down
}

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 glfwJoystickPresent.

Parameters

[in]	jid	The joystick to query.
[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.

Returns: An array of hat states, or NULL if the joystick is not present or an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and 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.

See also: Joystick hat states

Since: Added in version 3.3.

◆ glfwGetJoystickName()

const char* glfwGetJoystickName ( int jid )

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 glfwJoystickPresent.

Parameters

[in] jid The joystick to query.

Returns: The UTF-8 encoded name of the joystick, or NULL if the joystick is not present or an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and 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.

See also: Joystick name

Since: Added in version 3.0.

◆ glfwGetJoystickGUID()

const char* glfwGetJoystickGUID ( int jid )

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 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.

Parameters

[in] jid The joystick to query.

Returns: The UTF-8 encoded GUID of the joystick, or NULL if the joystick is not present or an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and 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.

See also: Gamepad input

Since: Added in version 3.3.

◆ glfwSetJoystickUserPointer()

void glfwSetJoystickUserPointer	(	int	jid,
		void *	pointer
	)

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.

Parameters

[in]	jid	The joystick whose pointer to set.
[in]	pointer	The new value.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function may be called from any thread. Access is not synchronized.

See also: Joystick user pointer; glfwGetJoystickUserPointer

Since: Added in version 3.3.

◆ glfwGetJoystickUserPointer()

void* glfwGetJoystickUserPointer ( int jid )

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.

Parameters

[in] jid The joystick whose pointer to return.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function may be called from any thread. Access is not synchronized.

See also: Joystick user pointer; glfwSetJoystickUserPointer

Since: Added in version 3.3.

◆ glfwJoystickIsGamepad()

int glfwJoystickIsGamepad ( int jid )

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 glfwJoystickPresent to check if a joystick is present regardless of whether it has a mapping.

Parameters

[in] jid The joystick to query.

Returns: GLFW_TRUE if a joystick is both present and has a gamepad mapping, or GLFW_FALSE otherwise.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_INVALID_ENUM.

Thread safety: This function must only be called from the main thread.

See also: Gamepad input; glfwGetGamepadState

Since: Added in version 3.3.

◆ glfwSetJoystickCallback()

GLFWjoystickfun glfwSetJoystickCallback ( GLFWjoystickfun 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 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.

Parameters

[in] callback The new callback, or NULL to remove the currently set callback.

Returns: The previously set callback, or NULL if no callback was set or the library had not been initialized.

Callback signature: void function_name(int jid, int event)

For more information about the callback parameters, see the function pointer type.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function must only be called from the main thread.

See also: Joystick configuration changes

Since: Added in version 3.2.

◆ glfwUpdateGamepadMappings()

int glfwUpdateGamepadMappings ( const char * string )

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 Gamepad mappings 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.

Parameters

[in] string The string containing the gamepad mappings.

Returns: GLFW_TRUE if successful, or GLFW_FALSE if an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_INVALID_VALUE.

Thread safety: This function must only be called from the main thread.

See also: Gamepad input; glfwJoystickIsGamepad; glfwGetGamepadName

Since: Added in version 3.3.

◆ glfwGetGamepadName()

const char* glfwGetGamepadName ( int jid )

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 glfwJoystickPresent to check whether it is present regardless of whether it has a mapping.

Parameters

[in] jid The joystick to query.

Returns: The UTF-8 encoded name of the gamepad, or NULL if the joystick is not present, does not have a mapping or an error 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.

See also: Gamepad input; glfwJoystickIsGamepad

Since: Added in version 3.3.

◆ glfwGetGamepadState()

int glfwGetGamepadState	(	int	jid,
		GLFWgamepadstate *	state
	)

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 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 GLFWgamepadstate. Unavailable buttons and axes will always report GLFW_RELEASE and 0.0 respectively.

Parameters

[in]	jid	The joystick to query.
[out]	state	The gamepad input state of the joystick.

Returns: GLFW_TRUE if successful, or GLFW_FALSE if no joystick is connected, it has no gamepad mapping or an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_INVALID_ENUM.

Thread safety: This function must only be called from the main thread.

See also: Gamepad input; glfwUpdateGamepadMappings; glfwJoystickIsGamepad

Since: Added in version 3.3.

◆ glfwSetClipboardString()

void glfwSetClipboardString	(	GLFWwindow *	window,
		const char *	string
	)

This function sets the system clipboard to the specified, UTF-8 encoded string.

Parameters

[in]	window	Deprecated. Any valid window or `NULL`.
[in]	string	A UTF-8 encoded string.

Errors: Possible errors include GLFW_NOT_INITIALIZED and 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.

See also: Clipboard input and output; glfwGetClipboardString

Since: Added in version 3.0.

◆ glfwGetClipboardString()

const char* glfwGetClipboardString ( GLFWwindow * window )

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 GLFW_FORMAT_UNAVAILABLE error is generated.

Parameters

[in] window Deprecated. Any valid window or NULL.

Returns: The contents of the clipboard as a UTF-8 encoded string, or NULL if an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED and 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 glfwGetClipboardString or glfwSetClipboardString, or until the library is terminated.

Thread safety: This function must only be called from the main thread.

See also: Clipboard input and output; glfwSetClipboardString

Since: Added in version 3.0.

◆ glfwGetTime()

double glfwGetTime ( void )

This function returns the current GLFW time, in seconds. Unless the time has been set using glfwSetTime it measures time elapsed since GLFW was initialized.

This function and glfwSetTime are helper functions on top of glfwGetTimerFrequency and 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.

Returns: The current time, in seconds, or zero if an error occurred.

Errors: Possible errors include 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 glfwSetTime.

See also: Time input

Since: Added in version 1.0.

◆ glfwSetTime()

void glfwSetTime ( double 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 glfwGetTime are helper functions on top of glfwGetTimerFrequency and glfwGetTimerValue.

Parameters

[in] time The new value, in seconds.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_INVALID_VALUE.

Remarks: The upper limit of GLFW time is calculated as floor((2⁶⁴ - 1) / 10⁹) 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 glfwGetTime.

See also: Time input

Since: Added in version 2.2.

◆ glfwGetTimerValue()

uint64_t glfwGetTimerValue ( void )

This function returns the current value of the raw timer, measured in 1 / frequency seconds. To get the frequency, call glfwGetTimerFrequency.

Returns: The value of the timer, or zero if an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function may be called from any thread.

See also: Time input; glfwGetTimerFrequency

Since: Added in version 3.2.

◆ glfwGetTimerFrequency()

uint64_t glfwGetTimerFrequency ( void )

This function returns the frequency, in Hz, of the raw timer.

Returns: The frequency of the timer, in Hz, or zero if an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Thread safety: This function may be called from any thread.

See also: Time input; glfwGetTimerValue

Since: Added in version 3.2.

Description

Modules

Typedefs

Functions

Macro Definition Documentation

◆ GLFW_RELEASE

◆ GLFW_PRESS

◆ GLFW_REPEAT

Typedef Documentation

◆ GLFWcursor

◆ GLFWmousebuttonfun

◆ GLFWcursorposfun

◆ GLFWcursorenterfun

◆ GLFWscrollfun

◆ GLFWkeyfun

◆ GLFWcharfun

◆ GLFWcharmodsfun

◆ GLFWdropfun

◆ GLFWjoystickfun

◆ GLFWgamepadstate

Function Documentation

◆ glfwGetInputMode()

◆ glfwSetInputMode()

◆ glfwRawMouseMotionSupported()

◆ glfwGetKeyName()

◆ glfwGetKeyScancode()

◆ glfwGetKey()

◆ glfwGetMouseButton()

◆ glfwGetCursorPos()

◆ glfwSetCursorPos()

◆ glfwCreateCursor()

◆ glfwCreateStandardCursor()

◆ glfwDestroyCursor()

◆ glfwSetCursor()

◆ glfwSetKeyCallback()

◆ glfwSetCharCallback()

◆ glfwSetCharModsCallback()

◆ glfwSetMouseButtonCallback()

◆ glfwSetCursorPosCallback()

◆ glfwSetCursorEnterCallback()

◆ glfwSetScrollCallback()

◆ glfwSetDropCallback()

◆ glfwJoystickPresent()

◆ glfwGetJoystickAxes()

◆ glfwGetJoystickButtons()

◆ glfwGetJoystickHats()

◆ glfwGetJoystickName()

◆ glfwGetJoystickGUID()

◆ glfwSetJoystickUserPointer()

◆ glfwGetJoystickUserPointer()

◆ glfwJoystickIsGamepad()

◆ glfwSetJoystickCallback()

◆ glfwUpdateGamepadMappings()

◆ glfwGetGamepadName()

◆ glfwGetGamepadState()

◆ glfwSetClipboardString()

◆ glfwGetClipboardString()

◆ glfwGetTime()

◆ glfwSetTime()

◆ glfwGetTimerValue()

◆ glfwGetTimerFrequency()