three-stdlib/shaders/DigitalGlitch.cjs

stand-alone library of threejs examples

"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const DigitalGlitch = {
  uniforms: {
    tDiffuse: { value: null },
    //diffuse texture
    tDisp: { value: null },
    //displacement texture for digital glitch squares
    byp: { value: 0 },
    //apply the glitch ?
    amount: { value: 0.08 },
    angle: { value: 0.02 },
    seed: { value: 0.02 },
    seed_x: { value: 0.02 },
    //-1,1
    seed_y: { value: 0.02 },
    //-1,1
    distortion_x: { value: 0.5 },
    distortion_y: { value: 0.6 },
    col_s: { value: 0.05 }
  },
  vertexShader: (
    /* glsl */
    `
		varying vec2 vUv;

		void main() {
			vUv = uv;
			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
		}
	`
  ),
  fragmentShader: (
    /* glsl */
    `
		uniform int byp; //should we apply the glitch ?
		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);
		//based on staffantans glitch shader for unity https://github.com/staffantan/unityglitch
				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.);
		//base from RGB shift shader
				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);
		//add noise
				vec4 snow = 200.*amount*vec4(rand(vec2(xs * seed,ys * seed*50.))*0.2);
				gl_FragColor = gl_FragColor+ snow;
			}
			else {
				gl_FragColor=texture2D (tDiffuse, vUv);
			}
		}
`
  )
};
exports.DigitalGlitch = DigitalGlitch;
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