57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
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// +build js,!wasm
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package glfw
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import (
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"errors"
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"github.com/gopherjs/gopherjs/js"
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)
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func newContext(canvas *js.Object, ca *contextAttributes) (context *js.Object, err error) {
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if js.Global.Get("WebGLRenderingContext") == js.Undefined {
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return nil, errors.New("Your browser doesn't appear to support WebGL.")
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}
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attrs := map[string]bool{
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"alpha": ca.Alpha,
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"depth": ca.Depth,
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"stencil": ca.Stencil,
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"antialias": ca.Antialias,
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"premultipliedAlpha": ca.PremultipliedAlpha,
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"preserveDrawingBuffer": ca.PreserveDrawingBuffer,
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"preferLowPowerToHighPerformance": ca.PreferLowPowerToHighPerformance,
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"failIfMajorPerformanceCaveat": ca.FailIfMajorPerformanceCaveat,
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}
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if gl := canvas.Call("getContext", "webgl", attrs); gl != nil {
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return gl, nil
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} else if gl := canvas.Call("getContext", "experimental-webgl", attrs); gl != nil {
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return gl, nil
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} else {
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return nil, errors.New("Creating a WebGL context has failed.")
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}
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}
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type contextAttributes struct {
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Alpha bool
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Depth bool
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Stencil bool
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Antialias bool
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PremultipliedAlpha bool
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PreserveDrawingBuffer bool
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PreferLowPowerToHighPerformance bool
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FailIfMajorPerformanceCaveat bool
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}
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func defaultAttributes() *contextAttributes {
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return &contextAttributes{
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Alpha: false,
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Depth: true,
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Stencil: false,
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Antialias: false,
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PremultipliedAlpha: false,
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PreserveDrawingBuffer: false,
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}
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}
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