WebGLRenderingContext.getContextAttributes()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

WebGLRenderingContext.getContextAttributes() 方法返回一个包含实际上下文参数的 WebGLContextAttributes 对象。如果上下文丢失,可能返回 null

语法

gl.getContextAttributes();

返回值

一个包含实际上下文参数的 WebGLContextAttributes 的对象,或 null(如果上下文丢失)。

实例

给定 <canvas> 元素

html
<canvas id="canvas"></canvas>

和给定 WebGL 上下文

js
var canvas = document.getElementById("canvas");
var gl = canvas.getContext("webgl");
gl.getContextAttributes();

getContextAttributes 方法返回描述在此上下文中设置的属性的对象,例如:

js
{
  alpha: true,
  antialias: true,
  depth: true,
  failIfMajorPerformanceCaveat: false,
  premultipliedAlpha: true,
  preserveDrawingBuffer: false,
  stencil: false
}

上下文的属性可以在用 HTMLCanvasElement.getContext() 方法创建上下文时设置:

js
canvas.getContext("webgl", { antialias: false, depth: false });

有关各个属性的更多信息,请参阅 getContext()

规范

Specification
WebGL Specification
# 5.14.2

浏览器兼容性

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desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
getContextAttributes

Legend

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Full support
Full support

参见