KodeLife basic RGB glitch shader

blot.glsl

#version 150

uniform float time;
uniform vec2 resolution;
uniform vec2 mouse;
uniform vec3 spectrum;

uniform sampler2D texture0;

out vec4 fragColor;

void main(void)
{
    vec2 uv = gl_FragCoord.xy / resolution;
   
    // displacement
    vec2 d = vec2(sin(spectrum.y)*0.5, 0);

    // texture + displacement
    vec3 r = texture(texture0, (uv + d)).rgb;
    vec3 g = texture(texture0,  uv + d*2.0).rgb;
    vec3 b = texture(texture0, uv + d*3.0).rgb;
    
    // rgb glitch
    vec3 glitch = vec3(r.r, g.g, b.b);
    
    fragColor = vec4(glitch, 1);
}