https://www.mhv-gifhorn.de/wp-content/plugins/vrm360/js/WebGL.js?ver=5.6

1/**
2 * @author alteredq / http://alteredqualia.com/
3 * @author mr.doob / http://mrdoob.com/
4 */
5
6var WEBGL = {
7
8	isWebGLAvailable: function () {
9
10		try {
11
12			var canvas = document.createElement( 'canvas' );
13			return !! ( window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ) );
14
15		} catch ( e ) {
16
17			return false;
18
19		}
20
21	},
22
23	isWebGL2Available: function () {
24
25		try {
26
27			var canvas = document.createElement( 'canvas' );
28			return !! ( window.WebGL2RenderingContext && canvas.getContext( 'webgl2' ) );
29
30		} catch ( e ) {
31
32			return false;
33
34		}
35
36	},
37
38	getWebGLErrorMessage: function () {
39
40		return this.getErrorMessage( 1 );
41
42	},
43
44	getWebGL2ErrorMessage: function () {
45
46		return this.getErrorMessage( 2 );
47
48	},
49
50	getErrorMessage: function ( version ) {
51
52		var names = {
53			1: 'WebGL',
54			2: 'WebGL 2'
55		};
56
57		var contexts = {
58			1: window.WebGLRenderingContext,
59			2: window.WebGL2RenderingContext
60		};
61
62		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>';
63
64		var element = document.createElement( 'div' );
65		element.id = 'webglmessage';
66		element.style.fontFamily = 'monospace';
67		element.style.fontSize = '13px';
68		element.style.fontWeight = 'normal';
69		element.style.textAlign = 'center';
70		element.style.background = '#fff';
71		element.style.color = '#000';
72		element.style.padding = '1.5em';
73		element.style.width = '400px';
74		element.style.margin = '5em auto 0';
75
76		if ( contexts[ version ] ) {
77
78			message = message.replace( '$0', 'graphics card' );
79
80		} else {
81
82			message = message.replace( '$0', 'browser' );
83
84		}
85
86		message = message.replace( '$1', names[ version ] );
87
88		element.innerHTML = message;
89
90		return element;
91
92	}
93
94};