screen signal distort .shader

digital_glitch_f.glsl

uniform int byp;
uniform sampler2D tDiffuse;
uniform sampler2D tDisp;
uniform float amount;
uniform float angle;
uniform float seed;
uniform float seed_x;
uniform float seed_y;
uniform float distortion_x;
uniform float distortion_y;
uniform float col_s;
varying vec2 vUv;

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

void main() {
	if(byp<1) {
		vec2 p = vUv;
		float xs = floor(gl_FragCoord.x / 0.5);
		float ys = floor(gl_FragCoord.y / 0.5);
		vec4 normal = texture2D (tDisp, p*seed*seed);
		if(p.y<distortion_x+col_s && p.y>distortion_x-col_s*seed) {
			if(seed_x>0.){
				p.y = 1. - (p.y + distortion_y);
			}
			else {
				p.y = distortion_y;
			}
		}

		if(p.x<distortion_y+col_s && p.x>distortion_y-col_s*seed) {
			if(seed_y>0.){
				p.x=distortion_x;
			}
			else {
				p.x = 1. - (p.x + distortion_x);
			}
		}

		p.x+=normal.x*seed_x*(seed/5.);
		p.y+=normal.y*seed_y*(seed/5.);
		
		vec2 offset = amount * vec2( cos(angle), sin(angle));
		vec4 cr = texture2D(tDiffuse, p + offset);
		vec4 cga = texture2D(tDiffuse, p);
		vec4 cb = texture2D(tDiffuse, p - offset);
		gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);
	}
	else {
		gl_FragColor=texture2D (tDiffuse, vUv);
	}
}

digital_glitch_v.glsl

varying vec2 vUv;
void main() {
  vUv = uv;
  gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}