Released emscripten-glfw 3.4.0.20250824 with the following changes:

• The code has been optimized for size
• Fixed #21: Flicker when resizing
  • to fix this issue, resizing (when the handle is moved or the window resized) is now delayed until glfwPollEvents() is called. Make sure to call glfwPollEvents() at the beginning of the loop to ensure a flicker-free experience. See Events & Main loop for more details.

Released emscripten-glfw 3.4.0.20250607 with the following changes:

• The main port file has been simplified and is now using the new (as of 4.0.10) “external port file” Emscripten feature

Released emscripten-glfw 3.4.0.20250305 with the following changes:

• Fixed missing i key in keyboard mapping. Thanks, @iarwain for PR #18

Released emscripten-glfw 3.4.0.20250209 with the following changes:

• Added support for touch (mobile)
• Added support for wasm64 (-sMEMORY64 Emscripten option)

Released emscripten-glfw 3.4.0.20250117 with the following changes:

• Added port option disableWebGL2 to disable support for WebGL2 when not needed (reduces JavaScript code size)

Released emscripten-glfw 3.4.0.20250112 with the following changes:

• Added support for GLFW_CONTEXT_VERSION_MAJOR and GLFW_CONTEXT_VERSION_MINOR
• Re-enable GL extensions by default (regression introduced in 3.4.0.20241230). Fixes #13.
• Changed port to automatically set the proper Emscripten flags to enable GLFW_CONTEXT_VERSION_MAJOR. Fixes #14.

Released emscripten-glfw 3.4.0.20241230 with the following changes:

• Added support for offscreen canvas (check example_offscreen_canvas for a comprehensive example)

Released emscripten-glfw 3.4.0.20241221 with the following changes:

• Added support for pthread (check example_pthread for a comprehensive example)

Released emscripten-glfw 3.4.0.20241004 with the following changes:

• Implemented custom cursors (glfwCreateCursor)
  • uses a canvas to draw the cursor image into it and convert it into a URL (canvas.toDataURL())
  • uses the CSS property syntax: cursor: url(xxx) xhot yhot, auto when calling glfwSetCursor with a custom cursor

Published a blog post properly introducing emscripten-glfw.

You can read about the history of the project and some of the primary features.

Released emscripten-glfw 3.4.0.20240907 with the following changes:

• Fixed Meta/Super key workaround to also handle the rare (but possible) use-case of having other keys down before pressing the Meta/Super key

Released emscripten-glfw 3.4.0.20240817 with the following changes:

• Major clipboard changes: the clipboard now uses the browser events to handle cut, copy and paste
• Added a way to tweak the timeouts for the Super + Key workaround (Super is also known as Meta or Cmd)
• Added a way to set which keys are allowed to be handled by the browser
• Added a convenient API to open a URL (emscripten::glfw3::OpenURL)
• Added a convenient API to detect if the runtime platform is Apple (emscripten::glfw3::IsRuntimePlatformApple), mostly used for keyboard shortcuts (Ctrl vs. Cmd).
• Added GLFW/emscripten_glfw3_version.h with EMSCRIPTEN_GLFW_VERSION define for compilation time version detection
• EMSCRIPTEN_USE_PORT_CONTRIB_GLFW3 port define now also contains the version

Breaking changes:

• The clipboard async API has been removed.
• Check the Clipboard support section for details on how to deal with the clipboard in your application.

Released emscripten-glfw 3.4.0.20240804 with the following changes:

• Fixed nullptr issue when clipboard is empty
• Fixed the internal clipboard being wiped on asynchronous callback error

Released emscripten-glfw 3.4.0.20240731 with the following changes:

• Added emscripten_glfw_get_clipboard_string the C version of emscripten::glfw3::GetClipboardString to retrieve the clipboard asynchronously
• Added a helper class emscripten::glfw3::FutureClipboardString to greatly simplify the more frequent use-cases
• GetClipboardString::value() now returns the internal clipboard in case of error, instead of throwing exception
• Added optimizationLevel option to the emscripten port

Released emscripten-glfw 3.4.0.20240727 with the following release notes:

• Introduced C++ API (namespace emscripten::glfw3) included with GLFW3/emscripten_glfw3.h:
  • provides a more correct API with sensible defaults (ex: std::string_view / std::optional<std::string_view> vs char const * which may or may not be nullptr)
  • allow for C++ only API (ex: std::future)
  • the C API is still available if you would rather stick to it
• Implemented emscripten::glfw3::GetClipboardString (C++ only) which provides a way of fetching the global clipboard in a browser environment (glfwGetClipboardString is not the right API due to the asynchronous nature of the underlying platform API).
• The cursor position is no longer clamped to the window size, and as a result, can have negative values or values greater than the window size. Note that GLFW implements a similar behavior on the macOS desktop platform.
• Implemented glfwSetWindowPosCallback
• Added support for GLFW Window Attribute GLFW_HOVERED
• Fixed #6: emscripten_glfw_make_canvas_resizable does not clean up properly.
• Fixed an issue with opacity: when using opacity, the handle is not working unless its z-index is higher than the canvas z-index

Released emscripten-glfw 3.4.0.20240625 with the following release notes:

• Implemented workaround for #4: Using Super + “Key” on macOS results in “Key” not being released. Due to the broken state of javascript handling the Super/Meta key, there is no good solution. The workaround implemented, releases all keys when Super is released. Although not a perfect solution, it guarantees that the state is eventually consistent:
  • if “Key” was released while “Super” was held, then when “Super” gets released, “Key” is released (later than when actually released, final state is consistent: “Key” in Release state)
  • if “Key” is still held when “Super” is released, “Key” is released when “Super” gets released, but immediately gets a down event (Up/Down event, final state is consistent”: “Key” in Pressed state)

Released emscripten-glfw 3.4.0.20240617 with the following release notes:

• Fixed #3: glfwGetKey must return one of GLFW_PRESS or GLFW_RELEASE

Released emscripten-glfw 3.4.0.20240616 with the following release notes:

• Implemented glfwGetClipboardString. Note that due to the async (and restrictive) nature of the navigator.clipboard.readText call, this synchronous API returns whatever was set via a previous call to glfwSetClipboardString and ignores the external clipboard entirely.

Released emscripten-glfw 3.4.0.20240601 with the following release notes:

• Fixed #2: Dynamically changing HiDPI awareness does not trigger content callback

Released emscripten-glfw 3.4.0.20240514 with the following release notes:

• Implemented glfwSetClipboardString

Released emscripten-glfw 3.4.0.20240501 with the following release notes:

• Fixed issue when calling glfwGetWindowContentScale with nullptr
• Renamed javascript api/impl since these names are not unique to avoid potential conflicts
• Added glfw3native.h to GLFW. Although not used (at this moment) by this implementation, this allows calling code to include it if necessary since it is part of a normal GLFW installation.

Released emscripten-glfw 3.4.0.20240318 with the following release notes:

• Fixed joystick/gamepad code that was improperly mapping GLFW_GAMEPAD_AXIS_LEFT_TRIGGER GLFW_GAMEPAD_AXIS_RIGHT_TRIGGER, GLFW_GAMEPAD_BUTTON_LEFT_THUMB and GLFW_GAMEPAD_BUTTON_RIGHT_THUMB
• GLFW_GAMEPAD_AXIS_LEFT_TRIGGER and GLFW_GAMEPAD_AXIS_RIGHT_TRIGGER are now properly represented as an analog value in the range [-1.0, +1.0]
• Please note the change in version numbering which from now on will be tied to the GLFW version implemented + date of release of this port to avoid confusion

I released emscripten-glfw 1.1.0 which implements GLFW 3.4 APIs:

• Upgraded to GLFW 3.4
• GLFW 3.4 features implemented
  • glfwGetPlatform and glfwPlatformSupported uses the GLFW_PLATFORM_EMSCRIPTEN constant defined in emscripten-glfw3.h (officially reserved value is 0x00060006)
  • glfwInitHint supports the new hint GLFW_PLATFORM
  • Supports all 10 cursors
  • Implemented glfwGetWindowTitle
  • Use GLFW_SCALE_FRAMEBUFFER to enable (resp. disable) Hi DPI support
  • Changed the functions that can report GLFW_FEATURE_UNAVAILABLE failure to report this error instead of a warning
• GLFW 3.4 features not implemented
  • GLFW_MOUSE_PASSTHROUGH is not supported
  • GLFW_CURSOR_CAPTURED cursor input mode is not supported (not possible in a browser context)
  • glfwInitAllocator is implemented as noop (could be supported for the C++ part only if there is demand, not javascript)
  • GLFW_POSITION_X and GLFW_POSITION_Y are not supported (same as glfwSetWindowPos)
  • GLFW_ANGLE_PLATFORM_TYPE is not supported (no direct access in browser, but implementation is most likely using it anyway)
• Since GLFW 3.4 introduces a proper constant to handle Hi DPI Awareness (GLFW_SCALE_FRAMEBUFFER), the prior constant used by this port (GLFW_SCALE_TO_MONITOR) is still accepted, but it is now deprecated. In addition, due to the fact that GLFW_SCALE_FRAMEBUFFER defaults to GLFW_TRUE, this port is now Hi DPI aware by default and needs to be explicitly turned off (glfwWindowHint(GLFW_SCALE_FRAMEBUFFER, GLFW_FALSE)) if this is the desired behavior.

Note: These changes are available in emscripten 3.1.56 (released on 2024/03/14) via the contrib port contrib.glfw3

I released emscripten-glfw 1.0.5 with a critical bug fix:

• Fixed memory corruption with joystick

Note: These changes are available in emscripten 3.1.55 (released on 2024/03/01) via the contrib port contrib.glfw3

I am very happy to announce the 1.0 release of my new free and open source project emscripten-glfw which is a port of glfw written in C++ for the web/webassembly platform.

Check out the live demo.