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/**
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 * @author alteredq / http://alteredqualia.com/
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 * @author mr.doob / http://mrdoob.com/
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 */
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var Detector = {
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	canvas: !! window.CanvasRenderingContext2D,
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	webgl: ( function () { try { return !! window.WebGLRenderingContext && !! document.createElement( 'canvas' ).getContext( 'experimental-webgl' ); } catch( e ) { return false; } } )(),
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	workers: !! window.Worker,
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	fileapi: window.File && window.FileReader && window.FileList && window.Blob,
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	getWebGLErrorMessage: function () {
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		var element = document.createElement( 'div' );
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		element.id = 'webgl-error-message';
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		element.style.fontFamily = 'monospace';
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		element.style.fontSize = '13px';
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		element.style.fontWeight = 'normal';
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		element.style.textAlign = 'center';
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		element.style.background = '#fff';
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		element.style.color = '#000';
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		element.style.padding = '1.5em';
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		element.style.width = '400px';
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		element.style.margin = '5em auto 0';
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		if ( ! this.webgl ) {
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			element.innerHTML = window.WebGLRenderingContext ? [
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				'Your graphics card does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br />',
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				'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
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			].join( '\n' ) : [
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				'Your browser does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br/>',
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				'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
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			].join( '\n' );
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		}
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		return element;
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	},
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	addGetWebGLMessage: function ( parameters ) {
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		var parent, id, element;
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		parameters = parameters || {};
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		parent = parameters.parent !== undefined ? parameters.parent : document.body;
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		id = parameters.id !== undefined ? parameters.id : 'oldie';
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		element = Detector.getWebGLErrorMessage();
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		element.id = id;
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		parent.appendChild( element );
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	}
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};
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