winit-sonoma-fix/FEATURES.md

Winit Scope

Winit aims to expose an interface that abstracts over window creation and input handling, and can be used to create both games and applications. It supports the main graphical platforms:

• Desktop
  • Windows
  • macOS
  • Unix
    • via X11
    • via Wayland
• Mobile
  • iOS
  • Android
• Web
  • via WASM

Most platforms expose capabilities that cannot be meaningfully transposed onto others. Winit does not aim to support every single feature of every platform, but rather to abstract over the common features available everywhere. In this context, APIs exposed in winit can be split into different "support tiers":

• Core: Features that are essential to providing a well-formed abstraction over each platform's windowing and input APIs.
• Platform: Platform-specific features that can't be meaningfully exposed through a common API and cannot be implemented outside of Winit without exposing a significant amount of Winit's internals or interfering with Winit's abstractions.
• Usability: Features that are not strictly essential to Winit's functionality, but provide meaningful usability improvements and cannot be reasonably implemented in an external crate. These are generally optional and exposed through Cargo features.

Core features are taken care of by the core Winit maintainers. Platform features are not. When a platform feature is submitted, the submitter is considered the expert in the feature and may be asked to support the feature should it break in the future.

Winit does not directly expose functionality for drawing inside windows or creating native menus, but does commit to providing APIs that higher-level crates can use to implement that functionality.

1.0 and stability

When all core features are implemented to the satisfaction of the Winit maintainers, Winit 1.0 will be released and the library will enter maintenance mode. For the most part, new core features will not be added past this point. New platform features may be accepted and exposed through point releases.

Tier upgrades

Some platform features could in theory be exposed across multiple platforms, but have not gone through the implementation work necessary to function on all platforms. When one of these features gets implemented across all platforms, a PR can be opened to upgrade the feature to a core feature. If that gets accepted, the platform-specific functions gets deprecated and become permanently exposed through the core, cross-platform API.

Features

Extending this section

If your PR makes notable changes to Winit's features, please update this section as follows:

• If your PR adds a new feature, add a brief description to the relevant section. If the feature is a core feature, add a row to the feature matrix and describe what platforms the feature has been implemented on.

• If your PR begins a new API rework, add a row to the Pending API Reworks table. If the PR implements the API rework on all relevant platforms, please move it to the Completed API Reworks table.

• If your PR implements an already-existing feature on a new platform, either mark the feature as completed, or mark it as mostly completed and link to an issue describing the problems with the implementation.

Core

Windowing

• Window initialization: Winit allows the creation of a window
• Providing pointer to init OpenGL: Winit provides the necessary pointers to initialize a working opengl context
• Providing pointer to init Vulkan: Same as OpenGL but for Vulkan
• Window decorations: The windows created by winit are properly decorated, and the decorations can be deactivated
• Window decorations toggle: Decorations can be turned on or off after window creation
• Window resizing: The windows created by winit can be resized and generate the appropriate events when they are. The application can precisely control its window size if desired.
• Window resize increments: When the window gets resized, the application can choose to snap the window's size to specific values.
• Window transparency: Winit allows the creation of windows with a transparent background.
• Window maximization: The windows created by winit can be maximized upon creation.
• Window maximization toggle: The windows created by winit can be maximized and unmaximized after creation.
• Fullscreen: The windows created by winit can be put into fullscreen mode.
• Fullscreen toggle: The windows created by winit can be switched to and from fullscreen after creation.
• Exclusive fullscreen: Winit allows changing the video mode of the monitor for fullscreen windows, and if applicable, captures the monitor for exclusive use by this application.
• HiDPI support: Winit assists developers in appropriately scaling HiDPI content.
• Popup / modal windows: Windows can be created relative to the client area of other windows, and parent windows can be disabled in favor of popup windows. This feature also guarantees that popup windows get drawn above their owner.

System Information

• Monitor list: Retrieve the list of monitors and their metadata, including which one is primary.
• Video mode query: Monitors can be queried for their supported fullscreen video modes (consisting of resolution, refresh rate, and bit depth).

Input Handling

• Mouse events: Generating mouse events associated with pointer motion, click, and scrolling events.
• Mouse set location: Forcibly changing the location of the pointer.
• Cursor grab: Locking the cursor so it cannot exit the client area of a window.
• Cursor icon: Changing the cursor icon, or hiding the cursor.
• Touch events: Single-touch events.
• Touch pressure: Touch events contain information about the amount of force being applied.
• Multitouch: Multi-touch events, including cancellation of a gesture.
• Keyboard events: Properly processing keyboard events using the user-specified keymap and translating keypresses into UTF-8 characters, handling dead keys and IMEs.
• Drag & Drop: Dragging content into winit, detecting when content enters, drops, or if the drop is cancelled.
• Raw Device Events: Capturing input from input devices without any OS filtering.
• Gamepad/Joystick events: Capturing input from gampads and joysticks.
• Device movement events:: Capturing input from the device gyroscope and accelerometer.

Platform

Windows

• Setting the taskbar icon
• Setting the parent window
• WS_EX_NOREDIRECTIONBITMAP support

macOS

• Window activation policy
• Window movable by background
• Transparent titlebar
• Hidden titlebar
• Hidden titlebar buttons
• Full-size content view

Unix

• Window urgency
• X11 Window Class
• X11 Override Redirect Flag
• GTK Theme Variant
• Base window size

iOS

• winit has a minimum OS requirement of iOS 8
• Get the UIWindow object pointer
• Get the UIViewController object pointer
• Get the UIView object pointer
• Get the UIScreen object pointer
• Setting the UIView hidpi factor
• Valid orientations
• Home indicator visibility
• Status bar visibility
• Deferrring system gestures
• Support for custom UIView derived class
• Getting the device idiom
• Getting the preferred video mode

Usability

• serde: Enables serialization/deserialization of certain types with Serde. (Maintainer: @Osspial)

Compatibility Matrix

Legend:

• ✔️: Works as intended
• ▢: Mostly works but some bugs are known
• ❌: Missing feature or large bugs making it unusable
• N/A: Not applicable for this platform
• ❓: Unknown status

Windowing

Feature	Windows	MacOS	Linux x11	Linux Wayland	Android	iOS	WASM
Window initialization	✔️	✔️	▢#5	✔️	▢#33	▢#33	❓
Providing pointer to init OpenGL	✔️	✔️	✔️	✔️	✔️	✔️	❓
Providing pointer to init Vulkan	✔️	✔️	✔️	✔️	✔️	❓	❓
Window decorations	✔️	✔️	✔️	▢#306	N/A	N/A	❓
Window decorations toggle	✔️	✔️	✔️	✔️	N/A	N/A	❓
Window resizing	✔️	▢#219	✔️	▢#306	N/A	N/A	❓
Window resize increments	❌	❌	❌	❌	❌	❌	❓
Window transparency	✔️	✔️	✔️	✔️	N/A	N/A	❓
Window maximization	✔️	✔️	✔️	✔️	N/A	N/A	❓
Window maximization toggle	✔️	✔️	✔️	✔️	N/A	N/A	❓
Fullscreen	✔️	✔️	✔️	✔️	N/A	✔️	❓
Fullscreen toggle	✔️	✔️	✔️	✔️	N/A	✔️	❓
Exclusive fullscreen	✔️	✔️	✔️	N/A	❌	✔️	❓
HiDPI support	✔️	✔️	✔️	✔️	▢#721	✔️	❓
Popup windows	❌	❌	❌	❌	❌	❌	❓

System information

Feature	Windows	MacOS	Linux x11	Linux Wayland	Android	iOS	WASM
Monitor list	✔️	✔️	✔️	✔️	N/A	✔️	❓
Video mode query	✔️	✔️	✔️	✔️	❌	✔️	❓

Input handling

Feature	Windows	MacOS	Linux x11	Linux Wayland	Android	iOS	WASM
Mouse events	✔️	▢#63	✔️	✔️	N/A	N/A	❓
Mouse set location	✔️	✔️	✔️	❓	N/A	N/A	❓
Cursor grab	✔️	▢#165	▢#242	❌#306	N/A	N/A	❓
Cursor icon	✔️	✔️	✔️	❌#306	N/A	N/A	❓
Touch events	✔️	❌	✔️	✔️	✔️	✔️	❓
Touch pressure	✔️	❌	❌	❌	❌	✔️	❓
Multitouch	✔️	❌	✔️	✔️	❓	✔️	❓
Keyboard events	✔️	✔️	✔️	✔️	❓	❌	❓
Drag & Drop	▢#720	▢#720	▢#720	❌#306	N/A	N/A	❓
Raw Device Events	▢#750	▢#750	▢#750	❌	❌	❌	❓
Gamepad/Joystick events	❌#804	❌	❌	❌	❌	❌	❓
Device movement events	❓	❓	❓	❓	❌	❌	❓

Pending API Reworks

Changes in the API that have been agreed upon but aren't implemented across all platforms.

Feature	Windows	MacOS	Linux x11	Linux Wayland	Android	iOS	WASM
New API for HiDPI (#315 #319)	✔️	✔️	✔️	✔️	▢#721	✔️	❓
Event Loop 2.0 (#459)	✔️	✔️	❌	✔️	❌	✔️	❓
Keyboard Input (#812)	❌	❌	❌	❌	❌	❌	❓

Completed API Reworks

Feature	Windows	MacOS	Linux x11	Linux Wayland	Android	iOS	WASM