Gio implements portable immediate mode GUI programs in Go. Gio programs run on all the major platforms: iOS/tvOS, Android, Linux (Wayland), macOS, Windows and browsers (Webassembly/WebGL).
Gio includes an efficient vector renderer based on the Pathfinder project (https://github.com/pcwalton/pathfinder). Text and other shapes are rendered using only their outlines without baking them into texture images, to support efficient animations, transformed drawing and pixel resolution independence.
Gio is designed to work with very few dependencies. It depends only on the platform libraries for window management, input and GPU drawing.
For Linux you need Wayland and the wayland, xkbcommon, GLES, EGL development packages. On Fedora 28 and newer, install the dependencies with the command
$ sudo dnf install wayland-devel libxkbcommon-devel mesa-libGLES-devel mesa-libEGL-devel
On Ubuntu 18.04 and newer, use
$ sudo apt install libwayland-dev libxkbcommon-dev libgles2-mesa-dev libegl1-mesa-dev
Note that Gio does not run with the NVIDIA proprietary driver.
Xcode is required for macOS, iOS, tvOS.
For Windows you need the ANGLE drivers for emulating OpenGL ES. You can build ANGLE yourself or use a prebuilt version.
With Go 1.12 or newer,
$ export GO111MODULE=on $ go run gioui.org/apps/hello
should display a simple message in a window.
$ go run gioui.org/apps/gophers
runs a simple (nonsense) demo that displays Go contributors fetched from GitHub.
If you run into quota issues, supply a
$ go run gioui.org/apps/gophers -token <github token>
For Android you need the Android SDK with the NDK installed. Point the ANDROID_HOME to the SDK root directory.
To build a Gio program as an .aar package, use the gio tool. For example,
$ export ANDROID_HOME=... $ go run gioui.org/cmd/gio -target android gioui.org/apps/gophers
produces gophers.aar, ready to use in an Android project. To run a Gio program on an Android device or emulator, use -buildmode=exe:
$ go run gioui.org/cmd/gio -buildmode exe -target android gioui.org/apps/gophers
Install the apk to a running emulator or attached device with adb:
$ adb install gophers.apk
The gio tool passes command line arguments to os.Args at runtime:
$ go run gioui.org/cmd/gio -buildmode exe -target android gioui.org/apps/gophers -token <github token>
To build a Gio program for iOS or tvOS you need a macOS machine with Xcode installed.
The gio tool can produce a framework ready to include in an Xcode project. For example,
$ go run gioui.org/cmd/gio -target ios gioui.org/apps/gophers
outputs Gophers.framework with the demo program built for iOS. For tvOS, use
$ go run gioui.org/cmd/gio -target tvos gioui.org/apps/gophers
Building for tvOS requires (the not yet released) Go 1.13.
To run a Gio program on an iOS device, use -buildmode=exe:
$ go run gioui.org/cmd/gio -buildmode exe -target ios -appid <bundle-id> gioui.org/apps/gophers
where is a valid bundle identifier previously provisioned in Xcode for your device.
Use the Window=>Devices and Simulators option on Xcode to install the ipa file to the device. If you have ideviceinstaller installed, you can install the app directly to your device:
$ ideviceinstaller -i gophers.ipa
To run a program on a running simulator, use the -o flag with a .app directory:
$ go run gioui.org/cmd/gio/ -o gophers.app -buildmode=exe -target ios gioui.org/apps/gophers
Install the app with simctl:
$ xcrun simctl install booted gophers.app
To run a Gio program in a browser with WebAssembly and WebGL support, use the Go webassembly driver and add a
$ go get github.com/shurcooL/goexec $ go run gioui.org/cmd/gio -target js gioui.org/apps/gophers $ goexec 'http.ListenAndServe(":8080", http.FileServer(http.Dir("gophers")))'
Open http://localhost:8080 in a browser to run the app.
Dual-licensed under MIT or the UNLICENSE.
Commit messages follow the Go project style:
the first line is prefixed with the package and a short summary. The rest of the message provides context
for the change and what it does. See
Fixes ~eliasnaur/gio#nnn or
Updates ~eliasnaur/gio#nnn if the change fixes or updates an existing
git send-email command is a convenient way to send patches to the mailing list. See
git-send-email.io for a thorough setup guide.
git send-email configured, you can clone the project and set it up for submitting your changes:
$ git clone https://git.sr.ht/~eliasnaur/gio $ cd gio $ git config sendemail.to '~email@example.com' $ git config sendemail.annotate yes
Configure your name and email address if you have not done so already:
$ git config --global user.email "firstname.lastname@example.org" $ git config --global user.name "Your Name"
Contributors must agree to the developer certificate of origin,
to ensure their work is compatible with the MIT and the UNLICENSE. Sign your commits with Signed-off-by
statements to show your agreement. The
git commit --signoff (or
-s) command signs a commit with
your name and email address.
Whenever you want to submit your work for review, use
git send-email with the base revision of your
changes. For example, to submit the most recent commit use
$ git send-email HEAD^