three.js/examples/js/shaders/RGBShiftShader.js

( function () {

	/**
 * 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
 */
	var RGBShiftShader = {
		uniforms: {
			'tDiffuse': {
				value: null
			},
			'amount': {
				value: 0.005
			},
			'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 amount;', 'uniform float angle;', 'varying vec2 vUv;', 'void main() {', '	vec2 offset = amount * vec2( cos(angle), sin(angle));', '	vec4 cr = texture2D(tDiffuse, vUv + offset);', '	vec4 cga = texture2D(tDiffuse, vUv);', '	vec4 cb = texture2D(tDiffuse, vUv - offset);', '	gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);', '}' ].join( '\n' )
	};

	THREE.RGBShiftShader = RGBShiftShader;

} )();