/usr/share/javascript/three/examples/js/shaders/DigitalGlitch.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 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | /**
* @author felixturner / http://airtight.cc/
*
* RGB Shift Shader
* Shifts red and blue channels from center in opposite directions
* Ported from http://kriss.cx/tom/2009/05/rgb-shift/
* by Tom Butterworth / http://kriss.cx/tom/
*
* amount: shift distance (1 is width of input)
* angle: shift angle in radians
*/
THREE.DigitalGlitch = {
uniforms: {
"tDiffuse": { value: null },//diffuse texture
"tDisp": { value: null },//displacement texture for digital glitch squares
"byp": { value: 0 },//apply the glitch ?
"amount": { value: 0.08 },
"angle": { value: 0.02 },
"seed": { value: 0.02 },
"seed_x": { value: 0.02 },//-1,1
"seed_y": { value: 0.02 },//-1,1
"distortion_x": { value: 0.5 },
"distortion_y": { value: 0.6 },
"col_s": { value: 0.05 }
},
vertexShader: [
"varying vec2 vUv;",
"void main() {",
"vUv = uv;",
"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
"}"
].join( "\n" ),
fragmentShader: [
"uniform int byp;",//should we apply the glitch ?
"uniform sampler2D tDiffuse;",
"uniform sampler2D tDisp;",
"uniform float amount;",
"uniform float angle;",
"uniform float seed;",
"uniform float seed_x;",
"uniform float seed_y;",
"uniform float distortion_x;",
"uniform float distortion_y;",
"uniform float col_s;",
"varying vec2 vUv;",
"float rand(vec2 co){",
"return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);",
"}",
"void main() {",
"if(byp<1) {",
"vec2 p = vUv;",
"float xs = floor(gl_FragCoord.x / 0.5);",
"float ys = floor(gl_FragCoord.y / 0.5);",
//based on staffantans glitch shader for unity https://github.com/staffantan/unityglitch
"vec4 normal = texture2D (tDisp, p*seed*seed);",
"if(p.y<distortion_x+col_s && p.y>distortion_x-col_s*seed) {",
"if(seed_x>0.){",
"p.y = 1. - (p.y + distortion_y);",
"}",
"else {",
"p.y = distortion_y;",
"}",
"}",
"if(p.x<distortion_y+col_s && p.x>distortion_y-col_s*seed) {",
"if(seed_y>0.){",
"p.x=distortion_x;",
"}",
"else {",
"p.x = 1. - (p.x + distortion_x);",
"}",
"}",
"p.x+=normal.x*seed_x*(seed/5.);",
"p.y+=normal.y*seed_y*(seed/5.);",
//base from RGB shift shader
"vec2 offset = amount * vec2( cos(angle), sin(angle));",
"vec4 cr = texture2D(tDiffuse, p + offset);",
"vec4 cga = texture2D(tDiffuse, p);",
"vec4 cb = texture2D(tDiffuse, p - offset);",
"gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);",
//add noise
"vec4 snow = 200.*amount*vec4(rand(vec2(xs * seed,ys * seed*50.))*0.2);",
"gl_FragColor = gl_FragColor+ snow;",
"}",
"else {",
"gl_FragColor=texture2D (tDiffuse, vUv);",
"}",
"}"
].join( "\n" )
};
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