topical media & game development
mobile-query-three-vendor-three-r53.js-shaders-RGBShiftShader.js / js
author: felixturner / 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.RGBShiftShader = {
uniforms: {
"tDiffuse": { type: "t", value: null },
"amount": { type: "f", value: 0.005 },
"angle": { type: "f", 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")
};
(C) Æliens
04/09/2009
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