three-stdlib/shaders/RGBShiftShader.js

stand-alone library of threejs examples

const RGBShiftShader = {
  uniforms: {
    tDiffuse: { value: null },
    amount: { value: 5e-3 },
    angle: { value: 0 }
  },
  vertexShader: (
    /* glsl */
    `
    varying vec2 vUv;

    void main() {

    	vUv = uv;
    	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

    }
  `
  ),
  fragmentShader: (
    /* glsl */
    `
    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);

    }
  `
  )
};
export {
  RGBShiftShader
};
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