https://opendive.io/wp-content/plugins/astroidz/assets/js/shaders/RGBShiftShader.js?ver=1.0.2

1/**
2 * @author felixturner / http://airtight.cc/
3 *
4 * RGB Shift Shader
5 * Shifts red and blue channels from center in opposite directions
6 * Ported from http://kriss.cx/tom/2009/05/rgb-shift/
7 * by Tom Butterworth / http://kriss.cx/tom/
8 *
9 * amount: shift distance (1 is width of input)
10 * angle: shift angle in radians
11 */
12
13THREE.RGBShiftShader = {
14
15	uniforms: {
16
17		"tDiffuse": { value: null },
18		"amount":   { value: 0.005 },
19		"angle":    { value: 0.0 }
20
21	},
22
23	vertexShader: [
24
25		"varying vec2 vUv;",
26
27		"void main() {",
28
29			"vUv = uv;",
30			"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
31
32		"}"
33
34	].join( "\n" ),
35
36	fragmentShader: [
37
38		"uniform sampler2D tDiffuse;",
39		"uniform float amount;",
40		"uniform float angle;",
41
42		"varying vec2 vUv;",
43
44		"void main() {",
45
46			"vec2 offset = amount * vec2( cos(angle), sin(angle));",
47			"vec4 cr = texture2D(tDiffuse, vUv + offset);",
48			"vec4 cga = texture2D(tDiffuse, vUv);",
49			"vec4 cb = texture2D(tDiffuse, vUv - offset);",
50			"gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);",
51
52		"}"
53
54	].join( "\n" )
55
56};