glsl-chromatic-aberration

glslify module for fast approximation of chromatic aberration as a post processing (fullscreen) effect.

The function shifts each RGB channel separately in the given direction.

Combine with a directional blur pass for more convincing results.

Installation

glslify is required for importing.

yarn add glsl-chromatic-aberration

npm i glsl-chromatic-aberration --save

Usage

vec4 ca( sampler2D image, vec2 uv, vec2 resolution, vec2 direction )

The function shifts each RGB channel of image separately in the given direction and returns the color for the pixel at uv.

Example

#pragma glslify: ca = require('glsl-chromatic-aberration')

uniform vec2 iResolution;
uniform sampler2D iChannel0;

void main() {
  vec2 uv = gl_FragCoord.xy / iResolution;
  vec2 direction = ( uv - .5 ) * 10.0;
  
  gl_FragColor = ca( iChannel0, uv, iResolution.xy, direction );
}