Typedefs
typedef struct GLFWwindow	GLFWwindow
	Opaque window object. More...

typedef void(*	GLFWwindowposfun )(GLFWwindow *, int, int)
	The function signature for window position callbacks. More...

typedef void(*	GLFWwindowsizefun )(GLFWwindow *, int, int)
	The function signature for window resize callbacks. More...

typedef void(*	GLFWwindowclosefun )(GLFWwindow *)
	The function signature for window close callbacks. More...

typedef void(*	GLFWwindowrefreshfun )(GLFWwindow *)
	The function signature for window content refresh callbacks. More...

typedef void(*	GLFWwindowfocusfun )(GLFWwindow *, int)
	The function signature for window focus/defocus callbacks. More...

typedef void(*	GLFWwindowiconifyfun )(GLFWwindow *, int)
	The function signature for window iconify/restore callbacks. More...

typedef void(*	GLFWframebuffersizefun )(GLFWwindow *, int, int)
	The function signature for framebuffer resize callbacks. More...

Functions
void	glfwDefaultWindowHints (void)
	Resets all window hints to their default values. More...

void	glfwWindowHint (int hint, int value)
	Sets the specified window hint to the desired value. More...

GLFWwindow *	glfwCreateWindow (int width, int height, const char title, GLFWmonitor monitor, GLFWwindow *share)
	Creates a window and its associated context. More...

void	glfwDestroyWindow (GLFWwindow *window)
	Destroys the specified window and its context. More...

int	glfwWindowShouldClose (GLFWwindow *window)
	Checks the close flag of the specified window. More...

void	glfwSetWindowShouldClose (GLFWwindow *window, int value)
	Sets the close flag of the specified window. More...

void	glfwSetWindowTitle (GLFWwindow window, const char title)
	Sets the title of the specified window. More...

void	glfwSetWindowIcon (GLFWwindow window, int count, const GLFWimage images)
	Sets the icon for the specified window. More...

void	glfwGetWindowPos (GLFWwindow window, int xpos, int *ypos)
	Retrieves the position of the client area of the specified window. More...

void	glfwSetWindowPos (GLFWwindow *window, int xpos, int ypos)
	Sets the position of the client area of the specified window. More...

void	glfwGetWindowSize (GLFWwindow window, int width, int *height)
	Retrieves the size of the client area of the specified window. More...

void	glfwSetWindowSizeLimits (GLFWwindow *window, int minwidth, int minheight, int maxwidth, int maxheight)
	Sets the size limits of the specified window. More...

void	glfwSetWindowAspectRatio (GLFWwindow *window, int numer, int denom)
	Sets the aspect ratio of the specified window. More...

void	glfwSetWindowSize (GLFWwindow *window, int width, int height)
	Sets the size of the client area of the specified window. More...

void	glfwGetFramebufferSize (GLFWwindow window, int width, int *height)
	Retrieves the size of the framebuffer of the specified window. More...

void	glfwGetWindowFrameSize (GLFWwindow window, int left, int top, int right, int *bottom)
	Retrieves the size of the frame of the window. More...

void	glfwIconifyWindow (GLFWwindow *window)
	Iconifies the specified window. More...

void	glfwRestoreWindow (GLFWwindow *window)
	Restores the specified window. More...

void	glfwMaximizeWindow (GLFWwindow *window)
	Maximizes the specified window. More...

void	glfwShowWindow (GLFWwindow *window)
	Makes the specified window visible. More...

void	glfwHideWindow (GLFWwindow *window)
	Hides the specified window. More...

void	glfwFocusWindow (GLFWwindow *window)
	Brings the specified window to front and sets input focus. More...

GLFWmonitor *	glfwGetWindowMonitor (GLFWwindow *window)
	Returns the monitor that the window uses for full screen mode. More...

void	glfwSetWindowMonitor (GLFWwindow window, GLFWmonitor monitor, int xpos, int ypos, int width, int height, int refreshRate)
	Sets the mode, monitor, video mode and placement of a window. More...

int	glfwGetWindowAttrib (GLFWwindow *window, int attrib)
	Returns an attribute of the specified window. More...

void	glfwSetWindowUserPointer (GLFWwindow window, void pointer)
	Sets the user pointer of the specified window. More...

void *	glfwGetWindowUserPointer (GLFWwindow *window)
	Returns the user pointer of the specified window. More...

GLFWwindowposfun	glfwSetWindowPosCallback (GLFWwindow *window, GLFWwindowposfun cbfun)
	Sets the position callback for the specified window. More...

GLFWwindowsizefun	glfwSetWindowSizeCallback (GLFWwindow *window, GLFWwindowsizefun cbfun)
	Sets the size callback for the specified window. More...

GLFWwindowclosefun	glfwSetWindowCloseCallback (GLFWwindow *window, GLFWwindowclosefun cbfun)
	Sets the close callback for the specified window. More...

GLFWwindowrefreshfun	glfwSetWindowRefreshCallback (GLFWwindow *window, GLFWwindowrefreshfun cbfun)
	Sets the refresh callback for the specified window. More...

GLFWwindowfocusfun	glfwSetWindowFocusCallback (GLFWwindow *window, GLFWwindowfocusfun cbfun)
	Sets the focus callback for the specified window. More...

GLFWwindowiconifyfun	glfwSetWindowIconifyCallback (GLFWwindow *window, GLFWwindowiconifyfun cbfun)
	Sets the iconify callback for the specified window. More...

GLFWframebuffersizefun	glfwSetFramebufferSizeCallback (GLFWwindow *window, GLFWframebuffersizefun cbfun)
	Sets the framebuffer resize callback for the specified window. More...

void	glfwPollEvents (void)
	Processes all pending events. More...

void	glfwWaitEvents (void)
	Waits until events are queued and processes them. More...

void	glfwWaitEventsTimeout (double timeout)
	Waits with timeout until events are queued and processes them. More...

void	glfwPostEmptyEvent (void)
	Posts an empty event to the event queue. More...

void	glfwSwapBuffers (GLFWwindow *window)
	Swaps the front and back buffers of the specified window. More...

Detailed Description

This is the reference documentation for window related functions and types, including creation, deletion and event polling. For more task-oriented information, see the Window guide.

Typedef Documentation

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

This is the function signature for framebuffer resize callback functions.

Parameters

[in]	window	The window whose framebuffer was resized.
[in]	width	The new width, in pixels, of the framebuffer.
[in]	height	The new height, in pixels, of the framebuffer.

See Also: Framebuffer size; glfwSetFramebufferSizeCallback

Since: Added in version 3.0.

typedef struct GLFWwindow GLFWwindow

Opaque window object.

See Also: Window objects

Since: Added in version 3.0.

typedef void(* GLFWwindowclosefun)(GLFWwindow *)

This is the function signature for window close callback functions.

Parameters

[in] window The window that the user attempted to close.

See Also: Window closing and close flag; glfwSetWindowCloseCallback

Since: Added in version 2.5.

: GLFW 3: Added window handle parameter.

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

This is the function signature for window focus callback functions.

Parameters

[in]	window	The window that gained or lost input focus.
[in]	focused	`GLFW_TRUE` if the window was given input focus, or `GLFW_FALSE` if it lost it.

See Also: Window input focus; glfwSetWindowFocusCallback

Since: Added in version 3.0.

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

This is the function signature for window iconify/restore callback functions.

Parameters

[in]	window	The window that was iconified or restored.
[in]	iconified	`GLFW_TRUE` if the window was iconified, or `GLFW_FALSE` if it was restored.

See Also: Window iconification; glfwSetWindowIconifyCallback

Since: Added in version 3.0.

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

This is the function signature for window position callback functions.

Parameters

[in]	window	The window that was moved.
[in]	xpos	The new x-coordinate, in screen coordinates, of the upper-left corner of the client area of the window.
[in]	ypos	The new y-coordinate, in screen coordinates, of the upper-left corner of the client area of the window.

See Also: Window position; glfwSetWindowPosCallback

Since: Added in version 3.0.

typedef void(* GLFWwindowrefreshfun)(GLFWwindow *)

This is the function signature for window refresh callback functions.

Parameters

[in] window The window whose content needs to be refreshed.

See Also: Window damage and refresh; glfwSetWindowRefreshCallback

Since: Added in version 2.5.

: GLFW 3: Added window handle parameter.

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

This is the function signature for window size callback functions.

Parameters

[in]	window	The window that was resized.
[in]	width	The new width, in screen coordinates, of the window.
[in]	height	The new height, in screen coordinates, of the window.

See Also: Window size; glfwSetWindowSizeCallback

Since: Added in version 1.0.

: GLFW 3: Added window handle parameter.

Function Documentation

GLFWwindow* glfwCreateWindow	(	int	width,
		int	height,
		const char *	title,
		GLFWmonitor *	monitor,
		GLFWwindow *	share
	)

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.

Successful creation does not change which context is current. Before you can use the newly created context, you need to make it current. For information about the share parameter, see Context object sharing.

The created window, framebuffer and context may differ from what you requested, as not all parameters and hints are hard constraints. 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 glfwGetWindowAttrib, glfwGetWindowSize and 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 Retrieving 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 "Windowed full screen" windows.

Once you have created the window, you can switch it between windowed and full screen mode with glfwSetWindowMonitor. If the window has an OpenGL or OpenGL ES context, it will be unaffected.

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 window hint, set its position and then show 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 after creation.

The swap interval is not set during window creation and the initial value may vary depending on driver settings and defaults.

Parameters

[in]	width	The desired width, in screen coordinates, of the window. This must be greater than zero.
[in]	height	The desired height, in screen coordinates, of the window. This must be greater than zero.
[in]	title	The initial, UTF-8 encoded window title.
[in]	monitor	The monitor to use for full screen mode, or `NULL` for windowed mode.
[in]	share	The window whose context to share resources with, or `NULL` to not share resources.

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

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM, GLFW_INVALID_VALUE, GLFW_API_UNAVAILABLE, GLFW_VERSION_UNAVAILABLE, GLFW_FORMAT_UNAVAILABLE and GLFW_PLATFORM_ERROR.

Remarks: Windows: Window creation will fail if the Microsoft GDI software OpenGL implementation is the only one available.; Windows: 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_WINLOGO icon will be used instead. To set a different icon, see glfwSetWindowIcon.; Windows: The context to share resources with must not be current on any other thread.; OS X: 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 in the Mac Developer Library.; OS X: The first time a window is created the menu bar is populated 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 can be disabled with a compile-time option.; OS X: On OS X 10.10 and later the window frame will not be rendered at full resolution on Retina displays unless the NSHighResolutionCapable key is enabled in the application bundle's Info.plist. For more information, see High Resolution Guidelines for OS X 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/MacOSXBundleInfo.plist.in in the source tree.; X11: Some window managers will not respect the placement of initially hidden windows.; 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.

Reentrancy: This function must not be called from a callback.

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

See Also: Window creation; glfwDestroyWindow

Since: Added in version 3.0. Replaces glfwOpenWindow.

void glfwDefaultWindowHints ( void )

This function resets all window hints to their default values.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

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

See Also: Window creation hints; glfwWindowHint

Since: Added in version 3.0.

void glfwDestroyWindow ( GLFWwindow * window )

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.

Parameters

[in] window The window to destroy.

Errors: Possible errors include GLFW_NOT_INITIALIZED and 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.

See Also: Window creation; glfwCreateWindow

Since: Added in version 3.0. Replaces glfwCloseWindow.

void glfwFocusWindow ( GLFWwindow * window )

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 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.

Parameters

[in] window The window to give input focus.

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: Window input focus

Since: Added in version 3.2.

void glfwGetFramebufferSize	(	GLFWwindow *	window,
		int *	width,
		int *	height
	)

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 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.

Parameters

[in]	window	The window whose framebuffer to query.
[out]	width	Where to store the width, in pixels, of the framebuffer, or `NULL`.
[out]	height	Where to store the height, in pixels, of the framebuffer, 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: Framebuffer size; glfwSetFramebufferSizeCallback

Since: Added in version 3.0.

int glfwGetWindowAttrib	(	GLFWwindow *	window,
		int	attrib
	)

This function returns the value of an attribute of the specified window or its OpenGL or OpenGL ES context.

Parameters

[in]	window	The window to query.
[in]	attrib	The window attribute whose value to return.

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

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_ENUM and GLFW_PLATFORM_ERROR.

Remarks: Framebuffer related hints are not window attributes. See Framebuffer related attributes for more information.; 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.

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

See Also: Window attributes

Since: Added in version 3.0. Replaces glfwGetWindowParam and glfwGetGLVersion.

void glfwGetWindowFrameSize	(	GLFWwindow *	window,
		int *	left,
		int *	top,
		int *	right,
		int *	bottom
	)

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 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.

Parameters

[in]	window	The window whose frame size to query.
[out]	left	Where to store the size, in screen coordinates, of the left edge of the window frame, or `NULL`.
[out]	top	Where to store the size, in screen coordinates, of the top edge of the window frame, or `NULL`.
[out]	right	Where to store the size, in screen coordinates, of the right edge of the window frame, or `NULL`.
[out]	bottom	Where to store the size, in screen coordinates, of the bottom edge of the window frame, 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: Window size

Since: Added in version 3.1.

GLFWmonitor* glfwGetWindowMonitor ( GLFWwindow * window )

This function returns the handle of the monitor that the specified window is in full screen on.

Parameters

[in] window The window to query.

Returns: The monitor, or NULL if the window is in windowed mode or an error occurred.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

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

See Also: Window monitor; glfwSetWindowMonitor

Since: Added in version 3.0.

void glfwGetWindowPos	(	GLFWwindow *	window,
		int *	xpos,
		int *	ypos
	)

This function retrieves the position, in screen coordinates, of the upper-left corner of the client 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.

Parameters

[in]	window	The window to query.
[out]	xpos	Where to store the x-coordinate of the upper-left corner of the client area, or `NULL`.
[out]	ypos	Where to store the y-coordinate of the upper-left corner of the client 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: Window position; glfwSetWindowPos

Since: Added in version 3.0.

void glfwGetWindowSize	(	GLFWwindow *	window,
		int *	width,
		int *	height
	)

This function retrieves the size, in screen coordinates, of the client area of the specified window. If you wish to retrieve the size of the framebuffer of the window in pixels, see 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.

Parameters

[in]	window	The window whose size to retrieve.
[out]	width	Where to store the width, in screen coordinates, of the client area, or `NULL`.
[out]	height	Where to store the height, in screen coordinates, of the client 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: Window size; glfwSetWindowSize

Since: Added in version 1.0.

: GLFW 3: Added window handle parameter.

void* glfwGetWindowUserPointer ( GLFWwindow * window )

This function returns the current value of the user-defined pointer of the specified window. The initial value is NULL.

Parameters

[in] window The window 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: User pointer; glfwSetWindowUserPointer

Since: Added in version 3.0.

void glfwHideWindow ( GLFWwindow * 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.

Parameters

[in] window The window to hide.

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: Window visibility; glfwShowWindow

Since: Added in version 3.0.

void glfwIconifyWindow ( GLFWwindow * 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.

Parameters

[in] window The window to iconify.

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: Window iconification; glfwRestoreWindow; glfwMaximizeWindow

Since: Added in version 2.1.

: GLFW 3: Added window handle parameter.

void glfwMaximizeWindow ( GLFWwindow * 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.

Parameters

[in] window The window to maximize.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_PLATFORM_ERROR.

Thread Safety: This function may only be called from the main thread.

See Also: Window iconification; glfwIconifyWindow; glfwRestoreWindow

Since: Added in GLFW 3.2.

void glfwPollEvents ( void )

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 to redraw the contents of your window when necessary during such operations.

On some platforms, certain events are sent directly to the application without going through the event queue, causing callbacks to be called outside of a call to one of the event processing functions.

Event processing is not required for joystick input to work.

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: Event processing; glfwWaitEvents; glfwWaitEventsTimeout

Since: Added in version 1.0.

void glfwPostEmptyEvent ( void )

This function posts an empty event from the current thread to the event queue, causing glfwWaitEvents or glfwWaitEventsTimeout to return.

If no windows exist, this function returns immediately. For synchronization of threads in applications that do not create windows, use your threading library of choice.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_PLATFORM_ERROR.

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

See Also: Event processing; glfwWaitEvents; glfwWaitEventsTimeout

Since: Added in version 3.1.

void glfwRestoreWindow ( GLFWwindow * 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.

Parameters

[in] window The window to restore.

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: Window iconification; glfwIconifyWindow; glfwMaximizeWindow

Since: Added in version 2.1.

: GLFW 3: Added window handle parameter.

GLFWframebuffersizefun glfwSetFramebufferSizeCallback	(	GLFWwindow *	window,
		GLFWframebuffersizefun	cbfun
	)

This function sets the framebuffer resize callback of the specified window, which is called when the framebuffer of the specified window is resized.

Parameters

[in]	window	The window whose callback to set.
[in]	cbfun	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.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

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

See Also: Framebuffer size

Since: Added in version 3.0.

void glfwSetWindowAspectRatio	(	GLFWwindow *	window,
		int	numer,
		int	denom
	)

This function sets the required aspect ratio of the client 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.

Parameters

[in]	window	The window to set limits for.
[in]	numer	The numerator of the desired aspect ratio, or `GLFW_DONT_CARE`.
[in]	denom	The denominator of the desired aspect ratio, or `GLFW_DONT_CARE`.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_VALUE and GLFW_PLATFORM_ERROR.

Remarks: If you set size limits and an aspect ratio that conflict, the results are undefined.

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

See Also: Window size limits; glfwSetWindowSizeLimits

Since: Added in version 3.2.

GLFWwindowclosefun glfwSetWindowCloseCallback	(	GLFWwindow *	window,
		GLFWwindowclosefun	cbfun
	)

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 glfwSetWindowShouldClose.

The close callback is not triggered by glfwDestroyWindow.

Parameters

[in]	window	The window whose callback to set.
[in]	cbfun	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.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

Remarks: OS X: 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.

See Also: Window closing and close flag

Since: Added in version 2.5.

: GLFW 3: Added window handle parameter and return value.

GLFWwindowfocusfun glfwSetWindowFocusCallback	(	GLFWwindow *	window,
		GLFWwindowfocusfun	cbfun
	)

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 glfwSetKeyCallback and glfwSetMouseButtonCallback.

Parameters

[in]	window	The window whose callback to set.
[in]	cbfun	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.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

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

See Also: Window input focus

Since: Added in version 3.0.

void glfwSetWindowIcon	(	GLFWwindow *	window,
		int	count,
		const GLFWimage *	images
	)

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 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.

Parameters

[in]	window	The window whose icon to set.
[in]	count	The number of images in the specified array, or zero to revert to the default window icon.
[in]	images	The images to create the icon from. This is ignored if count is zero.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_PLATFORM_ERROR.

Pointer lifetime: The specified image data is copied before this function returns.

Remarks: OS X: 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 in the Mac Developer Library.

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

See Also: Window icon

Since: Added in version 3.2.

GLFWwindowiconifyfun glfwSetWindowIconifyCallback	(	GLFWwindow *	window,
		GLFWwindowiconifyfun	cbfun
	)

This function sets the iconification callback of the specified window, which is called when the window is iconified or restored.

Parameters

[in]	window	The window whose callback to set.
[in]	cbfun	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.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

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

See Also: Window iconification

Since: Added in version 3.0.

void glfwSetWindowMonitor	(	GLFWwindow *	window,
		GLFWmonitor *	monitor,
		int	xpos,
		int	ypos,
		int	width,
		int	height,
		int	refreshRate
	)

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 client 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 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..

Parameters

[in]	window	The window whose monitor, size or video mode to set.
[in]	monitor	The desired monitor, or `NULL` to set windowed mode.
[in]	xpos	The desired x-coordinate of the upper-left corner of the client area.
[in]	ypos	The desired y-coordinate of the upper-left corner of the client area.
[in]	width	The desired with, in screen coordinates, of the client area or video mode.
[in]	height	The desired height, in screen coordinates, of the client area or video mode.
[in]	refreshRate	The desired refresh rate, in Hz, of the video mode, or `GLFW_DONT_CARE`.

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: Window monitor; Full screen windows; glfwGetWindowMonitor; glfwSetWindowSize

Since: Added in version 3.2.

void glfwSetWindowPos	(	GLFWwindow *	window,
		int	xpos,
		int	ypos
	)

This function sets the position, in screen coordinates, of the upper-left corner of the client 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.

Parameters

[in]	window	The window to query.
[in]	xpos	The x-coordinate of the upper-left corner of the client area.
[in]	ypos	The y-coordinate of the upper-left corner of the client area.

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: Window position; glfwGetWindowPos

Since: Added in version 1.0.

: GLFW 3: Added window handle parameter.

GLFWwindowposfun glfwSetWindowPosCallback	(	GLFWwindow *	window,
		GLFWwindowposfun	cbfun
	)

This function sets the position callback of the specified window, which is called when the window is moved. The callback is provided with the screen position of the upper-left corner of the client area of the window.

Parameters

[in]	window	The window whose callback to set.
[in]	cbfun	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.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

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

See Also: Window position

Since: Added in version 3.0.

GLFWwindowrefreshfun glfwSetWindowRefreshCallback	(	GLFWwindow *	window,
		GLFWwindowrefreshfun	cbfun
	)

This function sets the refresh callback of the specified window, which is called when the client 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 or Aqua, where the window contents are saved off-screen, this callback may be called only very infrequently or never at all.

Parameters

[in]	window	The window whose callback to set.
[in]	cbfun	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.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

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

See Also: Window damage and refresh

Since: Added in version 2.5.

: GLFW 3: Added window handle parameter and return value.

void glfwSetWindowShouldClose	(	GLFWwindow *	window,
		int	value
	)

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.

Parameters

[in]	window	The window whose flag to change.
[in]	value	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: Window closing and close flag

Since: Added in version 3.0.

void glfwSetWindowSize	(	GLFWwindow *	window,
		int	width,
		int	height
	)

This function sets the size, in screen coordinates, of the client 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 glfwSetWindowMonitor.

The window manager may put limits on what sizes are allowed. GLFW cannot and should not override these limits.

Parameters

[in]	window	The window to resize.
[in]	width	The desired width, in screen coordinates, of the window client area.
[in]	height	The desired height, in screen coordinates, of the window client area.

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: Window size; glfwGetWindowSize; glfwSetWindowMonitor

Since: Added in version 1.0.

: GLFW 3: Added window handle parameter.

GLFWwindowsizefun glfwSetWindowSizeCallback	(	GLFWwindow *	window,
		GLFWwindowsizefun	cbfun
	)

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 client area of the window.

Parameters

[in]	window	The window whose callback to set.
[in]	cbfun	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.

Errors: Possible errors include GLFW_NOT_INITIALIZED.

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

See Also: Window size

Since: Added in version 1.0.

: GLFW 3: Added window handle parameter and return value.

void glfwSetWindowSizeLimits	(	GLFWwindow *	window,
		int	minwidth,
		int	minheight,
		int	maxwidth,
		int	maxheight
	)

This function sets the size limits of the client 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.

Parameters

[in]	window	The window to set limits for.
[in]	minwidth	The minimum width, in screen coordinates, of the client area, or `GLFW_DONT_CARE`.
[in]	minheight	The minimum height, in screen coordinates, of the client area, or `GLFW_DONT_CARE`.
[in]	maxwidth	The maximum width, in screen coordinates, of the client area, or `GLFW_DONT_CARE`.
[in]	maxheight	The maximum height, in screen coordinates, of the client area, or `GLFW_DONT_CARE`.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_INVALID_VALUE and GLFW_PLATFORM_ERROR.

Remarks: If you set size limits and an aspect ratio that conflict, the results are undefined.

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

See Also: Window size limits; glfwSetWindowAspectRatio

Since: Added in version 3.2.

void glfwSetWindowTitle	(	GLFWwindow *	window,
		const char *	title
	)

This function sets the window title, encoded as UTF-8, of the specified window.

Parameters

[in]	window	The window whose title to change.
[in]	title	The UTF-8 encoded window title.

Errors: Possible errors include GLFW_NOT_INITIALIZED and GLFW_PLATFORM_ERROR.

Remarks: OS X: 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.

See Also: Window title

Since: Added in version 1.0.

: GLFW 3: Added window handle parameter.

void glfwSetWindowUserPointer	(	GLFWwindow *	window,
		void *	pointer
	)

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.

Parameters

[in]	window	The window 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: User pointer; glfwGetWindowUserPointer

Since: Added in version 3.0.

void glfwShowWindow ( GLFWwindow * window )

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.

Parameters

[in] window The window to make visible.

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: Window visibility; glfwHideWindow

Since: Added in version 3.0.

void glfwSwapBuffers ( GLFWwindow * 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 GLFW_NO_WINDOW_CONTEXT error.

This function does not apply to Vulkan. If you are rendering with Vulkan, see vkQueuePresentKHR instead.

Parameters

[in] window The window whose buffers to swap.

Errors: Possible errors include GLFW_NOT_INITIALIZED, GLFW_NO_WINDOW_CONTEXT and GLFW_PLATFORM_ERROR.

Remarks: EGL: The context of the specified window must be current on the calling thread.

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

See Also: Buffer swapping; glfwSwapInterval

Since: Added in version 1.0.

: GLFW 3: Added window handle parameter.

void glfwWaitEvents ( void )

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 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 to redraw the contents of your window when necessary during such operations.

On some platforms, certain callbacks may be called outside of a call to one of the event processing functions.

If no windows exist, this function returns immediately. For synchronization of threads in applications that do not create windows, use your threading library of choice.

Event processing is not required for joystick input to work.

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: Event processing; glfwPollEvents; glfwWaitEventsTimeout

Since: Added in version 2.5.

void glfwWaitEventsTimeout ( double timeout )

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 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 to redraw the contents of your window when necessary during such operations.

On some platforms, certain callbacks may be called outside of a call to one of the event processing functions.

If no windows exist, this function returns immediately. For synchronization of threads in applications that do not create windows, use your threading library of choice.

Event processing is not required for joystick input to work.

Parameters

[in] timeout The maximum amount of time, in seconds, to wait.

Reentrancy: This function must not be called from a callback.

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

See Also: Event processing; glfwPollEvents; glfwWaitEvents

Since: Added in version 3.2.

void glfwWindowHint	(	int	hint,
		int	value
	)

This function sets hints for the next call to glfwCreateWindow. The hints, once set, retain their values until changed by a call to glfwWindowHint or glfwDefaultWindowHints, or until the library is terminated.

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 glfwCreateWindow.

Parameters