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| 1 | +/** |
| 2 | + * @author alteredq / http://alteredqualia.com/ |
| 3 | + * @author mr.doob / http://mrdoob.com/ |
| 4 | + */ |
| 5 | + |
| 6 | +var 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 | +}; |
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