AltParty2024/assets/shaders/random-pool/cromatic-abberation.gdshader

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2024-10-08 20:55:57 +03:00
//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.) = 15.;
uniform float radius : hint_range(0., 1.) = 0.8;
uniform float attenuation : hint_range(1., 5.) = 4.;
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(TEXTURE, SCREEN_UV + chaos_v * amount_r).r,
texture(TEXTURE, SCREEN_UV + chaos_v * amount_g).g,
texture(TEXTURE, SCREEN_UV + chaos_v * amount_b).b,
1.);
}