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/**
* @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
*/
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" )
};
export { RGBShiftShader };
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