mirror of
https://git.sr.ht/~eliasnaur/gio
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Elias Naur
168 lines
6.5 KiB
Markdown
168 lines
6.5 KiB
Markdown
# Gio
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Gio implements portable immediate mode GUI programs in Go. Gio programs run on all the major platforms:
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iOS/tvOS, Android, Linux (Wayland), macOS, Windows and browsers (Webassembly/WebGL).
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Gio includes an efficient vector renderer based on the Pathfinder project (https://github.com/pcwalton/pathfinder).
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Text and other shapes are rendered using only their outlines without baking them into texture images,
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to support efficient animations, transformed drawing and pixel resolution independence.
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[](https://godoc.org/gioui.org/ui)
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## Quickstart
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Gio is designed to work with very few dependencies. It depends only on the platform libraries for
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window management, input and GPU drawing.
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For Linux you need Wayland and the wayland, xkbcommon, GLES, EGL development packages. On Fedora 28 and newer,
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install the dependencies with the command
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$ sudo dnf install wayland-devel libxkbcommon-devel mesa-libGLES-devel mesa-libEGL-devel
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On Ubuntu 18.04 and newer, use
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$ sudo apt install libwayland-dev libxkbcommon-dev libgles2-mesa-dev libegl1-mesa-dev
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Note that Gio does not run with the NVIDIA proprietary driver.
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Xcode is required for macOS, iOS, tvOS.
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For Windows you need the ANGLE drivers for emulating OpenGL ES. You can build ANGLE yourself or use
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[a prebuilt version](https://drive.google.com/file/d/1k2950mHNtR2iwhweHS1rJ7reChTa3rki/view?usp=sharing).
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With [Go 1.12](https://golang.org/dl/) or newer,
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$ export GO111MODULE=on
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$ go run gioui.org/apps/hello
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should display a simple message in a window.
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The command
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$ go run gioui.org/apps/gophers
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runs a simple (nonsense) demo that displays Go contributors fetched from GitHub.
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If you run into quota issues, supply a
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[Github token](https://help.github.com/en/articles/creating-a-personal-access-token-for-the-command-line)
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with the `-token` flag:
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$ go run gioui.org/apps/gophers -token <github token>
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## Android
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For Android you need the Android SDK with the NDK installed. Point the ANDROID_HOME to the SDK root
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directory.
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To build a Gio program as an .aar package, use the gio tool. For example,
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$ export ANDROID_HOME=...
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$ go run gioui.org/cmd/gio -target android gioui.org/apps/gophers
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produces gophers.aar, ready to use in an Android project. To run
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a Gio program on an Android device or emulator, use -buildmode=exe:
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$ go run gioui.org/cmd/gio -buildmode exe -target android gioui.org/apps/gophers
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Install the apk to a running emulator or attached device with adb:
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$ adb install gophers.apk
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The gio tool passes command line arguments to os.Args at runtime:
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$ go run gioui.org/cmd/gio -buildmode exe -target android gioui.org/apps/gophers -token <github token>
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## iOS/tvOS
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To build a Gio program for iOS or tvOS you need a macOS machine with Xcode installed.
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The gio tool can produce a framework ready to include in an Xcode project. For example,
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$ go run gioui.org/cmd/gio -target ios gioui.org/apps/gophers
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outputs Gophers.framework with the demo program built for iOS. For tvOS, use `-target tvos`:
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$ go run gioui.org/cmd/gio -target tvos gioui.org/apps/gophers
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Building for tvOS requires (the not yet released) Go 1.13.
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To run a Gio program on an iOS device, use -buildmode=exe:
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$ go run gioui.org/cmd/gio -buildmode exe -target ios -appid <bundle-id> gioui.org/apps/gophers
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where <bundle-id> is a valid bundle identifier previously provisioned in Xcode for your device.
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Use the Window=>Devices and Simulators option on Xcode to install the ipa file to the device.
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If you have [ideviceinstaller](https://github.com/libimobiledevice/ideviceinstaller) installed,
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you can install the app directly to your device:
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$ ideviceinstaller -i gophers.ipa
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To run a program on a running simulator, use the -o flag with a .app directory:
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$ go run gioui.org/cmd/gio/ -o gophers.app -buildmode=exe -target ios gioui.org/apps/gophers
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Install the app with simctl:
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$ xcrun simctl install booted gophers.app
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## Webassembly/WebGL
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To run a Gio program in a browser with WebAssembly and WebGL support, use the Go webassembly
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driver and add a <div id="giowindow"> element to a HTML page. The gio tool can also output
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a directory ready to view in a browser:
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$ go get github.com/shurcooL/goexec
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$ go run gioui.org/cmd/gio -target js gioui.org/apps/gophers
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$ goexec 'http.ListenAndServe(":8080", http.FileServer(http.Dir("gophers")))'
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Open http://localhost:8080 in a browser to run the app.
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## Issues
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File bugs and TODOs through the the [issue tracker](https://todo.sr.ht/~eliasnaur/gio) or send an email
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to [~eliasnaur/gio@todo.sr.ht](mailto:~eliasnaur/gio-dev@lists.sr.ht). For general discussion, use the
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mailing list: [~eliasnaur/gio-dev@lists.sr.ht](mailto:~eliasnaur/gio-dev@lists.sr.ht).
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## License
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Dual-licensed under MIT or the [UNLICENSE](http://unlicense.org).
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## Contributing
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Post discussion and patches to the [mailing list](https://lists.sr.ht/~eliasnaur/gio-dev). Send your
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message to [~eliasnaur/gio-dev@lists.sr.ht](mailto:~eliasnaur/gio-dev@lists.sr.ht); no Sourcehut account
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is required and you can post without being subscribed.
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Commit messages follow [the Go project style](https://golang.org/doc/contribute.html#commit_messages):
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the first line is prefixed with the package and a short summary. The rest of the message provides context
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for the change and what it does. See
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[an example](https://git.sr.ht/~eliasnaur/gio/commit/abb9d291e954f3b80384046d7d4487e1ead6bd6a).
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Add `Fixes ~eliasnaur/gio#nnn` or `Updates ~eliasnaur/gio#nnn` if the change fixes or updates an existing
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issue.
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The `git send-email` command is a convenient way to send patches to the mailing list. See
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[git-send-email.io](https://git-send-email.io) for a thorough setup guide.
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With `git send-email` configured, you can clone the project and set it up for submitting your changes:
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$ git clone https://git.sr.ht/~eliasnaur/gio
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$ cd gio
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$ git config sendemail.to '~eliasnaur/gio-dev@lists.sr.ht'
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$ git config sendemail.annotate yes
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Configure your name and email address if you have not done so already:
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$ git config --global user.email "you@example.com"
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$ git config --global user.name "Your Name"
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Contributors must agree to the [developer certificate of origin](https://developercertificate.org/),
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to ensure their work is compatible with the MIT and the UNLICENSE. Sign your commits with Signed-off-by
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statements to show your agreement. The `git commit --signoff` (or `-s`) command signs a commit with
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your name and email address.
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Whenever you want to submit your work for review, use `git send-email` with the base revision of your
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changes. For example, to submit the most recent commit use
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$ git send-email HEAD^
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