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/** | ||
* @author alteredq / http://alteredqualia.com/ | ||
* @author mr.doob / http://mrdoob.com/ | ||
*/ | ||
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var Detector = { | ||
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canvas: !! window.CanvasRenderingContext2D, | ||
webgl: ( function () { try { return !! window.WebGLRenderingContext && !! document.createElement( 'canvas' ).getContext( 'experimental-webgl' ); } catch( e ) { return false; } } )(), | ||
workers: !! window.Worker, | ||
fileapi: window.File && window.FileReader && window.FileList && window.Blob, | ||
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getWebGLErrorMessage: function () { | ||
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var element = document.createElement( 'div' ); | ||
element.id = 'webgl-error-message'; | ||
element.style.fontFamily = 'monospace'; | ||
element.style.fontSize = '13px'; | ||
element.style.fontWeight = 'normal'; | ||
element.style.textAlign = 'center'; | ||
element.style.background = '#fff'; | ||
element.style.color = '#000'; | ||
element.style.padding = '1.5em'; | ||
element.style.width = '400px'; | ||
element.style.margin = '5em auto 0'; | ||
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if ( ! this.webgl ) { | ||
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element.innerHTML = window.WebGLRenderingContext ? [ | ||
'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 />', | ||
'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.' | ||
].join( '\n' ) : [ | ||
'Your browser does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br/>', | ||
'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.' | ||
].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; | ||
id = parameters.id !== undefined ? parameters.id : 'oldie'; | ||
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element = Detector.getWebGLErrorMessage(); | ||
element.id = id; | ||
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parent.appendChild( element ); | ||
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} | ||
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}; |
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// http://mrl.nyu.edu/~perlin/noise/ | ||
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var ImprovedNoise = function () { | ||
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var p = [151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10, | ||
23,190,6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,88,237,149,56,87, | ||
174,20,125,136,171,168,68,175,74,165,71,134,139,48,27,166,77,146,158,231,83,111,229,122,60,211, | ||
133,230,220,105,92,41,55,46,245,40,244,102,143,54,65,25,63,161,1,216,80,73,209,76,132,187,208, | ||
89,18,169,200,196,135,130,116,188,159,86,164,100,109,198,173,186,3,64,52,217,226,250,124,123,5, | ||
202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,223,183,170,213,119, | ||
248,152,2,44,154,163,70,221,153,101,155,167,43,172,9,129,22,39,253,19,98,108,110,79,113,224,232, | ||
178,185,112,104,218,246,97,228,251,34,242,193,238,210,144,12,191,179,162,241,81,51,145,235,249, | ||
14,239,107,49,192,214,31,181,199,106,157,184,84,204,176,115,121,50,45,127,4,150,254,138,236,205, | ||
93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180]; | ||
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for (var i=0; i < 256 ; i++) { | ||
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p[256+i] = p[i]; | ||
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} | ||
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function fade(t) { | ||
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return t * t * t * (t * (t * 6 - 15) + 10); | ||
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} | ||
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function lerp(t, a, b) { | ||
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return a + t * (b - a); | ||
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} | ||
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function grad(hash, x, y, z) { | ||
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var h = hash & 15; | ||
var u = h < 8 ? x : y, v = h < 4 ? y : h == 12 || h == 14 ? x : z; | ||
return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v); | ||
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} | ||
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return { | ||
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noise: function (x, y, z) { | ||
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var floorX = ~~x, floorY = ~~y, floorZ = ~~z; | ||
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var X = floorX & 255, Y = floorY & 255, Z = floorZ & 255; | ||
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x -= floorX; | ||
y -= floorY; | ||
z -= floorZ; | ||
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var xMinus1 = x -1, yMinus1 = y - 1, zMinus1 = z - 1; | ||
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var u = fade(x), v = fade(y), w = fade(z); | ||
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var A = p[X]+Y, AA = p[A]+Z, AB = p[A+1]+Z, B = p[X+1]+Y, BA = p[B]+Z, BB = p[B+1]+Z; | ||
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return lerp(w, lerp(v, lerp(u, grad(p[AA], x, y, z), | ||
grad(p[BA], xMinus1, y, z)), | ||
lerp(u, grad(p[AB], x, yMinus1, z), | ||
grad(p[BB], xMinus1, yMinus1, z))), | ||
lerp(v, lerp(u, grad(p[AA+1], x, y, zMinus1), | ||
grad(p[BA+1], xMinus1, y, z-1)), | ||
lerp(u, grad(p[AB+1], x, yMinus1, zMinus1), | ||
grad(p[BB+1], xMinus1, yMinus1, zMinus1)))); | ||
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} | ||
} | ||
} |
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