GLFW

Introduction

GLFW is an Open Source, multi-platform library for OpenGL, OpenGL ES and Vulkan application development. It provides a simple, platform-independent API for creating windows, contexts and surfaces, reading input, handling events, etc.

GLFW natively supports Windows, macOS and Linux and other Unix-like systems. On Linux both X11 and Wayland are supported.

GLFW is licensed under the zlib/libpng license.

You can download the latest stable release as source or Windows binaries, or fetch the latest branch from GitHub. Each release starting with 3.0 also has a corresponding annotated tag with source and binary archives.

The documentation is available online and is included in all source and binary archives. See the release notes for new features, caveats and deprecations in the latest release. For more details see the version history.

The master branch is the stable integration branch and should always compile and run on all supported platforms, although details of newly added features may change until they have been included in a release. New features and many bug fixes live in other branches until they are stable enough to merge.

If you are new to GLFW, you may find the tutorial for GLFW 3 useful. If you have used GLFW 2 in the past, there is a transition guide for moving to the GLFW 3 API.

Compiling GLFW

GLFW itself requires only the headers and libraries for your OS and window system. It does not need the headers for any context creation API (WGL, GLX, EGL, NSGL, OSMesa) or rendering API (OpenGL, OpenGL ES, Vulkan) to enable support for them.

GLFW supports compilation on Windows with Visual C++ 2010 and later, MinGW and MinGW-w64, on macOS with Clang and on Linux and other Unix-like systems with GCC and Clang. It will likely compile in other environments as well, but this is not regularly tested.

There are pre-compiled Windows binaries available for all supported compilers.

See the compilation guide for more information about how to compile GLFW yourself.

Using GLFW

See the documentation for tutorials, guides and the API reference.

Contributing to GLFW

See the contribution guide for more information.

System requirements

GLFW supports Windows XP and later and macOS 10.8 and later. Linux and other Unix-like systems running the X Window System are supported even without a desktop environment or modern extensions, although some features require a running window or clipboard manager. The OSMesa backend requires Mesa 6.3.

See the compatibility guide in the documentation for more information.

Dependencies

GLFW itself needs only CMake 3.1 or later and the headers and libraries for your OS and window system.

The examples and test programs depend on a number of tiny libraries. These are located in the deps/ directory.

• getopt_port for examples with command-line options
• TinyCThread for threaded examples
• glad2 for loading OpenGL and Vulkan functions
• linmath.h for linear algebra in examples
• Nuklear for test and example UI
• stb_image_write for writing images to disk

The documentation is generated with Doxygen if CMake can find that tool.

Reporting bugs

Bugs are reported to our issue tracker. Please check the contribution guide for information on what to include when reporting a bug.

Changelog

• Added OpenGL and OpenGL ES user contexts for multiple window contexts via GLFWusercontext, glfwCreateUserContext, glfwDestroyUserContext, glfwMakeUserContextCurrent, glfwGetCurrentUserContext (#1687)
• Added glfwInitAllocator for setting a custom memory allocator (#544,#1628,#1947)
• Added GLFWallocator struct and GLFWallocatefun, GLFWreallocatefun and GLFWdeallocatefun types (#544,#1628,#1947)
• Added GLFW_RESIZE_NWSE_CURSOR, GLFW_RESIZE_NESW_CURSOR, GLFW_RESIZE_ALL_CURSOR and GLFW_NOT_ALLOWED_CURSOR cursor shapes (#427)
• Added GLFW_RESIZE_EW_CURSOR alias for GLFW_HRESIZE_CURSOR (#427)
• Added GLFW_RESIZE_NS_CURSOR alias for GLFW_VRESIZE_CURSOR (#427)
• Added GLFW_POINTING_HAND_CURSOR alias for GLFW_HAND_CURSOR (#427)
• Added GLFW_MOUSE_PASSTHROUGH window hint for letting mouse input pass through the window (#1236,#1568)
• Added GLFW_FEATURE_UNAVAILABLE error for platform limitations (#1692)
• Added GLFW_FEATURE_UNIMPLEMENTED error for incomplete backends (#1692)
• Added GLFW_ANGLE_PLATFORM_TYPE init hint and GLFW_ANGLE_PLATFORM_TYPE_* values to select ANGLE backend (#1380)
• Added GLFW_X11_XCB_VULKAN_SURFACE init hint for selecting X11 Vulkan surface extension (#1793)
• Added GLFW_LIBRARY_TYPE CMake variable for overriding the library type (#279,#1307,#1497,#1574,#1928)
• Added GLFW_PKG_CONFIG_REQUIRES_PRIVATE and GLFW_PKG_CONFIG_LIBS_PRIVATE CMake variables exposing pkg-config dependencies (#1307)
• Made joystick subsystem initialize at first use (#1284,#1646)
• Made GLFW_DOUBLEBUFFER a read-only window attribute
• Updated the minimum required CMake version to 3.1
• Disabled tests and examples by default when built as a CMake subdirectory
• Bugfix: The CMake config-file package used an absolute path and was not relocatable (#1470)
• Bugfix: Video modes with a duplicate screen area were discarded (#1555,#1556)
• Bugfix: Compiling with -Wextra-semi caused warnings (#1440)
• Bugfix: Built-in mappings failed because some OEMs re-used VID/PID (#1583)
• Bugfix: Some extension loader headers did not prevent default OpenGL header inclusion (#1695)
• Bugfix: Buffers were swapped at creation on single-buffered windows (#1873)
• Bugfix: Gamepad mapping updates could spam GLFW_INVALID_VALUE due to incompatible controllers sharing hardware ID (#1763)
• [Win32] Added the GLFW_WIN32_KEYBOARD_MENU window hint for enabling access to the window menu
• [Win32] Added a version info resource to the GLFW DLL
• [Win32] Disabled framebuffer transparency on Windows 7 when DWM windows are opaque (#1512)
• [Win32] Bugfix: GLFW_INCLUDE_VULKAN plus VK_USE_PLATFORM_WIN32_KHR caused symbol redefinition (#1524)
• [Win32] Bugfix: The cursor position event was emitted before its cursor enter event (#1490)
• [Win32] Bugfix: The window hint GLFW_MAXIMIZED did not move or resize the window (#1499)
• [Win32] Bugfix: Disabled cursor mode interfered with some non-client actions
• [Win32] Bugfix: Super key was not released after Win+V hotkey (#1622)
• [Win32] Bugfix: glfwGetKeyName could access out of bounds and return an invalid pointer
• [Win32] Bugfix: Some synthetic key events were reported as GLFW_KEY_UNKNOWN (#1623)
• [Win32] Bugfix: Non-BMP Unicode codepoint input was reported as UTF-16
• [Win32] Bugfix: Monitor functions could return invalid values after configuration change (#1761)
• [Win32] Bugfix: Initialization would segfault on Windows 8 (not 8.1) (#1775)
• [Win32] Bugfix: Duplicate size events were not filtered (#1610)
• [Win32] Bugfix: Full screen windows were incorrectly resized by DPI changes (#1582)
• [Win32] Bugfix: GLFW_SCALE_TO_MONITOR had no effect on systems older than Windows 10 version 1703 (#1511)
• [Win32] Bugfix: USE_MSVC_RUNTIME_LIBRARY_DLL had no effect on CMake 3.15 or later (#1783,#1796)
• [Win32] Bugfix: Compilation with LLVM for Windows failed (#1807,#1824,#1874)
• [Win32] Bugfix: The foreground lock timeout was overridden, ignoring the user
• [Cocoa] Added support for VK_EXT_metal_surface (#1619)
• [Cocoa] Added locating the Vulkan loader at runtime in an application bundle
• [Cocoa] Moved main menu creation to GLFW initialization time (#1649)
• [Cocoa] Changed EGLNativeWindowType from NSView to CALayer (#1169)
• [Cocoa] Changed F13 key to report Print Screen for cross-platform consistency (#1786)
• [Cocoa] Removed dependency on the CoreVideo framework
• [Cocoa] Bugfix: glfwSetWindowSize used a bottom-left anchor point (#1553)
• [Cocoa] Bugfix: Window remained on screen after destruction until event poll (#1412)
• [Cocoa] Bugfix: Event processing before window creation would assert (#1543)
• [Cocoa] Bugfix: Undecorated windows could not be iconified on recent macOS
• [Cocoa] Bugfix: Touching event queue from secondary thread before main thread would abort (#1649)
• [Cocoa] Bugfix: Non-BMP Unicode codepoint input was reported as UTF-16 (#1635)
• [Cocoa] Bugfix: Failing to retrieve the refresh rate of built-in displays could leak memory
• [Cocoa] Bugfix: Objective-C files were compiled as C with CMake 3.19 (#1787)
• [Cocoa] Bugfix: Duplicate video modes were not filtered out (#1830)
• [Cocoa] Bugfix: Menubar was not clickable on macOS 10.15+ until it lost and regained focus (#1648,#1802)
• [Cocoa] Bugfix: Monitor name query could segfault on macOS 11 (#1809,#1833)
• [Cocoa] Bugfix: The install name of the installed dylib was relative (#1504)
• [Cocoa] Bugfix: The MoltenVK layer contents scale was updated only after related events were emitted
• [X11] Bugfix: The CMake files did not check for the XInput headers (#1480)
• [X11] Bugfix: Key names were not updated when the keyboard layout changed (#1462,#1528)
• [X11] Bugfix: Decorations could not be enabled after window creation (#1566)
• [X11] Bugfix: Content scale fallback value could be inconsistent (#1578)
• [X11] Bugfix: glfwMaximizeWindow had no effect on hidden windows
• [X11] Bugfix: Clearing GLFW_FLOATING on a hidden window caused invalid read
• [X11] Bugfix: Changing GLFW_FLOATING on a hidden window could silently fail
• [X11] Bugfix: Disabled cursor mode was interrupted by indicator windows
• [X11] Bugfix: Monitor physical dimensions could be reported as zero mm
• [X11] Bugfix: Window position events were not emitted during resizing (#1613)
• [X11] Bugfix: glfwFocusWindow could terminate on older WMs or without a WM
• [X11] Bugfix: Querying a disconnected monitor could segfault (#1602)
• [X11] Bugfix: IME input of CJK was broken for "C" locale (#1587,#1636)
• [X11] Bugfix: Termination would segfault if the IM had been destroyed
• [X11] Bugfix: Any IM started after initialization would not be detected
• [X11] Bugfix: Xlib errors caused by other parts of the application could be reported as GLFW errors
• [X11] Bugfix: A handle race condition could cause a BadWindow error (#1633)
• [X11] Bugfix: XKB path used keysyms instead of physical locations for non-printable keys (#1598)
• [X11] Bugfix: Function keys were mapped to GLFW_KEY_UNKNOWN for some layout combinaitons (#1598)
• [X11] Bugfix: Keys pressed simultaneously with others were not always reported (#1112,#1415,#1472,#1616)
• [X11] Bugfix: Some window attributes were not applied on leaving fullscreen (#1863)
• [X11] Bugfix: Changing GLFW_FLOATING could leak memory
• [Wayland] Added dynamic loading of all Wayland libraries
• [Wayland] Removed support for wl_shell (#1443)
• [Wayland] Bugfix: The GLFW_HAND_CURSOR shape used the wrong image (#1432)
• [Wayland] Bugfix: CLOCK_MONOTONIC was not correctly enabled
• [Wayland] Bugfix: Repeated keys could be reported with NULL window (#1704)
• [Wayland] Bugfix: Retrieving partial framebuffer size would segfault
• [Wayland] Bugfix: Scrolling offsets were inverted compared to other platforms (#1463)
• [Wayland] Bugfix: Client-Side Decorations were destroyed in the wrong worder (#1798)
• [Wayland] Bugfix: Monitors physical size could report zero (#1784,#1792)
• [Wayland] Bugfix: Some keys were not repeating in Wayland (#1908)
• [Wayland] Bugfix: Non-arrow cursors are offset from the hotspot (#1706,#1899)
• [POSIX] Removed use of deprecated function gettimeofday
• [POSIX] Bugfix: CLOCK_MONOTONIC was not correctly tested for or enabled
• [NSGL] Removed enforcement of forward-compatible flag for core contexts
• [NSGL] Bugfix: GLFW_COCOA_RETINA_FRAMEBUFFER had no effect on newer macOS versions (#1442)
• [NSGL] Bugfix: Workaround for swap interval on 10.14 broke on 10.12 (#1483)
• [NSGL] Bugfix: Defining GL_SILENCE_DEPRECATION externally caused a duplicate definition warning (#1840)
• [EGL] Added platform selection via the EGL_EXT_platform_base extension (#442)
• [EGL] Added ANGLE backend selection via EGL_ANGLE_platform_angle extension (#1380)
• [EGL] Bugfix: The GLFW_DOUBLEBUFFER context attribute was ignored (#1843)

Contact

On glfw.org you can find the latest version of GLFW, as well as news, documentation and other information about the project.

If you have questions related to the use of GLFW, we have a forum, and the #glfw IRC channel on Libera.Chat.

If you have a bug to report, a patch to submit or a feature you'd like to request, please file it in the issue tracker on GitHub.

Finally, if you're interested in helping out with the development of GLFW or porting it to your favorite platform, join us on the forum, GitHub or IRC.

Acknowledgements

GLFW exists because people around the world donated their time and lent their skills.

• Bobyshev Alexander
• Laurent Aphecetche
• Matt Arsenault
• ashishgamedev
• David Avedissian
• Keith Bauer
• John Bartholomew
• Coşku Baş
• Niklas Behrens
• Andrew Belt
• Nevyn Bengtsson
• Niklas Bergström
• Denis Bernard
• Doug Binks
• blanco
• Waris Boonyasiriwat
• Kyle Brenneman
• Rok Breulj
• Kai Burjack
• Martin Capitanio
• Nicolas Caramelli
• David Carlier
• Arturo Castro
• Chi-kwan Chan
• Joseph Chua
• Ian Clarkson
• Michał Cichoń
• Lambert Clara
• Anna Clarke
• Yaron Cohen-Tal
• Omar Cornut
• Andrew Corrigan
• Bailey Cosier
• Noel Cower
• CuriouserThing
• Jason Daly
• Jarrod Davis
• Olivier Delannoy
• Paul R. Deppe
• Michael Dickens
• Роман Донченко
• Mario Dorn
• Wolfgang Draxinger
• Jonathan Dummer
• Ralph Eastwood
• Fredrik Ehnbom
• Robin Eklind
• Siavash Eliasi
• Ahmad Fatoum
• Felipe Ferreira
• Michael Fogleman
• Gerald Franz
• Mário Freitas
• GeO4d
• Marcus Geelnard
• Charles Giessen
• Ryan C. Gordon
• Stephen Gowen
• Kovid Goyal
• Eloi Marín Gratacós
• Stefan Gustavson
• Jonathan Hale
• hdf89shfdfs
• Sylvain Hellegouarch
• Matthew Henry
• heromyth
• Lucas Hinderberger
• Paul Holden
• Warren Hu
• Charles Huber
• IntellectualKitty
• Aaron Jacobs
• Erik S. V. Jansson
• Toni Jovanoski
• Arseny Kapoulkine
• Cem Karan
• Osman Keskin
• Koray Kilinc
• Josh Kilmer
• Byunghoon Kim
• Cameron King
• Peter Knut
• Christoph Kubisch
• Yuri Kunde Schlesner
• Rokas Kupstys
• Konstantin Käfer
• Eric Larson
• Francis Lecavalier
• Jong Won Lee
• Robin Leffmann
• Glenn Lewis
• Shane Liesegang
• Anders Lindqvist
• Leon Linhart
• Marco Lizza
• Eyal Lotem
• Aaron Loucks
• Luflosi
• lukect
• Tristam MacDonald
• Hans Mackowiak
• Дмитри Малышев
• Zbigniew Mandziejewicz
• Adam Marcus
• Célestin Marot
• Kyle McDonald
• David V. McKay
• David Medlock
• Bryce Mehring
• Jonathan Mercier
• Marcel Metz
• Liam Middlebrook
• Ave Milia
• Jonathan Miller
• Kenneth Miller
• Bruce Mitchener
• Jack Moffitt
• Jeff Molofee
• Alexander Monakov
• Pierre Morel
• Jon Morton
• Pierre Moulon
• Martins Mozeiko
• Julian Møller
• ndogxj
• n3rdopolis
• Kristian Nielsen
• Kamil Nowakowski
• onox
• Denis Ovod
• Ozzy
• Andri Pálsson
• Peoro
• Braden Pellett
• Christopher Pelloux
• Arturo J. Pérez
• Vladimir Perminov
• Anthony Pesch
• Orson Peters
• Emmanuel Gil Peyrot
• Cyril Pichard
• Keith Pitt
• Stanislav Podgorskiy
• Konstantin Podsvirov
• Nathan Poirier
• Alexandre Pretyman
• Pablo Prietz
• przemekmirek
• pthom
• Guillaume Racicot
• Philip Rideout
• Eddie Ringle
• Max Risuhin
• Jorge Rodriguez
• Luca Rood
• Ed Ropple
• Aleksey Rybalkin
• Mikko Rytkönen
• Riku Salminen
• Brandon Schaefer
• Sebastian Schuberth
• Christian Sdunek
• Matt Sealey
• Steve Sexton
• Arkady Shapkin
• Ali Sherief
• Yoshiki Shibukawa
• Dmitri Shuralyov
• Daniel Skorupski
• Anthony Smith
• Bradley Smith
• Cliff Smolinsky
• Patrick Snape
• Erlend Sogge Heggen
• Julian Squires
• Johannes Stein
• Pontus Stenetorp
• Michael Stocker
• Justin Stoecker
• Elviss Strazdins
• Paul Sultana
• Nathan Sweet
• TTK-Bandit
• Jared Tiala
• Sergey Tikhomirov
• Arthur Tombs
• Ioannis Tsakpinis
• Samuli Tuomola
• Matthew Turner
• urraka
• Elias Vanderstuyft
• Stef Velzel
• Jari Vetoniemi
• Ricardo Vieira
• Nicholas Vitovitch
• Simon Voordouw
• Corentin Wallez
• Torsten Walluhn
• Patrick Walton
• Xo Wang
• Jay Weisskopf
• Frank Wille
• Andy Williams
• Joel Winarske
• Richard A. Wilkes
• Tatsuya Yatagawa
• Ryogo Yoshimura
• Lukas Zanner
• Andrey Zholos
• Aihui Zhu
• Santi Zupancic
• Jonas Ådahl
• Lasse Öörni
• Leonard König
• All the unmentioned and anonymous contributors in the GLFW community, for bug reports, patches, feedback, testing and encouragement