49 lines
1.7 KiB
Markdown
49 lines
1.7 KiB
Markdown
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# gl [](https://travis-ci.org/goxjs/gl) [](https://godoc.org/github.com/fyne-io/gl-js)
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Package gl is a Go cross-platform binding for OpenGL, with an OpenGL ES 2-like API.
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It supports:
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- **macOS**, **Linux** and **Windows** via OpenGL 2.1 backend,
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- **iOS** and **Android** via OpenGL ES 2.0 backend,
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- **Modern Browsers** (desktop and mobile) via WebGL 1.0 backend.
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This is a fork of golang.org/x/mobile/gl package with [CL 8793](https://go-review.googlesource.com/8793)
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merged in and Windows support added. This package is fully functional, but may eventually become superceded by
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the new x/mobile/gl plan. It will exist and be fully supported until it can be safely replaced by a better package.
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Installation
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------------
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```bash
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go get -u github.com/fyne-io/gl-js/...
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GOARCH=js go get -u -d github.com/fyne-io/gl-js/...
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```
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Usage
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-----
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This OpenGL binding has a ContextWatcher, which implements [glfw.ContextWatcher](https://godoc.org/github.com/goxjs/glfw#ContextWatcher)
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interface. Recommended usage is with github.com/fyne-io/glfw-js package, which accepts a ContextWatcher in its Init, and takes on the responsibility
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of notifying it when context is made current or detached.
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```Go
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if err := glfw.Init(gl.ContextWatcher); err != nil {
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// Handle error.
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}
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defer glfw.Terminate()
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```
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If you're not using a ContextWatcher-aware glfw library, you must call methods of gl.ContextWatcher yourself whenever
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you make a context current or detached.
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```Go
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window.MakeContextCurrent()
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gl.ContextWatcher.OnMakeCurrent(nil)
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glfw.DetachCurrentContext()
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gl.ContextWatcher.OnDetach()
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```
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