https://www.spacex.com/assets/js/follow-dragon/three/WebGL.js

1/**
2 * @author alteredq / http://alteredqualia.com/
3 * @author mr.doob / http://mrdoob.com/
4 */
5
6var WEBGL = {
7	isWebGLAvailable: function () {
8		try {
9			var canvas = document.createElement( 'canvas' );
10			return !! ( window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ) );
11		} catch ( e ) {
12			return false;
13		}
14	},
15	isWebGL2Available: function () {
16		try {
17			var canvas = document.createElement( 'canvas' );
18			return !! ( window.WebGL2RenderingContext && canvas.getContext( 'webgl2' ) );
19		} catch ( e ) {
20			return false;
21		}
22	},
23	getWebGLErrorMessage: function () {
24		return this.getErrorMessage( 1 );
25	},
26	getWebGL2ErrorMessage: function () {
27		return this.getErrorMessage( 2 );
28	},
29	getErrorMessage: function ( version ) {
30		var names = {
31			1: 'WebGL',
32			2: 'WebGL 2'
33		};
34		var contexts = {
35			1: window.WebGLRenderingContext,
36			2: window.WebGL2RenderingContext
37		};
38		var message = 'Your $0 does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">$1</a>';
39		var element = document.createElement( 'div' );
40		element.id = 'webglmessage';
41		element.style.fontFamily = 'monospace';
42		element.style.fontSize = '13px';
43		element.style.fontWeight = 'normal';
44		element.style.textAlign = 'center';
45		element.style.background = '#fff';
46		element.style.color = '#000';
47		element.style.padding = '1.5em';
48		element.style.width = '400px';
49		element.style.margin = '5em auto 0';
50		if ( contexts[ version ] ) {
51			message = message.replace( '$0', 'graphics card' );
52		} else {
53			message = message.replace( '$0', 'browser' );
54		}
55		message = message.replace( '$1', names[ version ] );
56		element.innerHTML = message;
57		return element;
58	}
59};
60//export { WEBGL };