Chromatic Chaos Distortion (Godot4)

Shader by CasualGarageCoder, updated to Godot 4. It gives chaos distortion and animate it, with exported properties. Should be applied to something like a ColorRect so objects below are affected.

Shader code
//shader by CasualGarageCoder, updated to Godot 4
shader_type canvas_item;

uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;

uniform float chaos : hint_range(0., 32.) = 1.;
uniform float radius : hint_range(0., 1.) = 0.5;
uniform float attenuation : hint_range(1., 5.) = 2.;

varying vec2 amount_r;
varying vec2 amount_g;
varying vec2 amount_b;

float rand(vec2 co){
    return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453) - .5;
}

void vertex() {
    vec2 shifted_uv = (UV * 2.) - 1.;
    amount_r = normalize(
        vec2(rand(TIME * 1.3 * shifted_uv),
        rand(TIME * 1.64 * shifted_uv)));
    amount_g = normalize(
        vec2(rand(TIME * 1.5 * shifted_uv),
        rand(TIME * 1.7 * shifted_uv)));
    amount_b = normalize(
        vec2(rand(TIME * 1.17 * shifted_uv),
        rand(TIME * 1.23 * shifted_uv)));
}

void fragment() {
    vec2 chaos_v = vec2(chaos, -chaos) * SCREEN_PIXEL_SIZE;
    
    float dist = length((UV - vec2(0.5)) * 2.);
    float att = clamp(dist / radius, 0., 1.);
    
    chaos_v *= 1. - pow(att, attenuation);
    
    COLOR = vec4(
        texture(SCREEN_TEXTURE, SCREEN_UV + chaos_v * amount_r).r,
        texture(SCREEN_TEXTURE, SCREEN_UV + chaos_v * amount_g).g,
        texture(SCREEN_TEXTURE, SCREEN_UV + chaos_v * amount_b).b,
        1.);
}
Tags
chromatic aberration, glitch
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

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