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https://github.com/DanielnetoDotCom/YouPHPTube
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58 lines
1 KiB
JavaScript
58 lines
1 KiB
JavaScript
/**
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* Kaleidoscope Shader
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* Radial reflection around center point
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* Ported from: http://pixelshaders.com/editor/
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* by Toby Schachman / http://tobyschachman.com/
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*
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* sides: number of reflections
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* angle: initial angle in radians
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*/
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THREE.KaleidoShader = {
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uniforms: {
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'tDiffuse': { value: null },
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'sides': { value: 6.0 },
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'angle': { value: 0.0 }
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},
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vertexShader: [
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'varying vec2 vUv;',
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'void main() {',
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' vUv = uv;',
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' gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
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'}'
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].join( '\n' ),
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fragmentShader: [
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'uniform sampler2D tDiffuse;',
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'uniform float sides;',
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'uniform float angle;',
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'varying vec2 vUv;',
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'void main() {',
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' vec2 p = vUv - 0.5;',
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' float r = length(p);',
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' float a = atan(p.y, p.x) + angle;',
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' float tau = 2. * 3.1416 ;',
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' a = mod(a, tau/sides);',
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' a = abs(a - tau/sides/2.) ;',
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' p = r * vec2(cos(a), sin(a));',
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' vec4 color = texture2D(tDiffuse, p + 0.5);',
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' gl_FragColor = color;',
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'}'
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].join( '\n' )
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};
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