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