/usr/share/javascript/three/examples/js/shaders/KaleidoShader.js is in libjs-three 80+dfsg2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | /**
* @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
*/
THREE.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" )
};
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