(function (global, factory) {
  if (typeof define === "function" && define.amd) {
    define(["exports"], factory);
  } else if (typeof exports !== "undefined") {
    factory(exports);
  } else {
    var mod = {
      exports: {}
    };
    factory(mod.exports);
    global.DigitalGlitch = mod.exports;
  }
})(typeof globalThis !== "undefined" ? globalThis : typeof self !== "undefined" ? self : this, function (_exports) {
  "use strict";

  Object.defineProperty(_exports, "__esModule", {
    value: true
  });
  _exports.DigitalGlitch = void 0;

  /**
   * RGB Shift Shader
   * Shifts red and blue channels from center in opposite directions
   * Ported from http://kriss.cx/tom/2009/05/rgb-shift/
   * by Tom Butterworth / http://kriss.cx/tom/
   *
   * amount: shift distance (1 is width of input)
   * angle: shift angle in radians
   */
  var 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 */
    "\n\n\t\tvarying vec2 vUv;\n\t\tvoid main() {\n\t\t\tvUv = uv;\n\t\t\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n\t\t}",
    fragmentShader:
    /* glsl */
    "\n\n\t\tuniform int byp; //should we apply the glitch ?\n\n\t\tuniform sampler2D tDiffuse;\n\t\tuniform sampler2D tDisp;\n\n\t\tuniform float amount;\n\t\tuniform float angle;\n\t\tuniform float seed;\n\t\tuniform float seed_x;\n\t\tuniform float seed_y;\n\t\tuniform float distortion_x;\n\t\tuniform float distortion_y;\n\t\tuniform float col_s;\n\n\t\tvarying vec2 vUv;\n\n\n\t\tfloat rand(vec2 co){\n\t\t\treturn fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);\n\t\t}\n\n\t\tvoid main() {\n\t\t\tif(byp<1) {\n\t\t\t\tvec2 p = vUv;\n\t\t\t\tfloat xs = floor(gl_FragCoord.x / 0.5);\n\t\t\t\tfloat ys = floor(gl_FragCoord.y / 0.5);\n\t\t\t\t//based on staffantans glitch shader for unity https://github.com/staffantan/unityglitch\n\t\t\t\tvec4 normal = texture2D (tDisp, p*seed*seed);\n\t\t\t\tif(p.y<distortion_x+col_s && p.y>distortion_x-col_s*seed) {\n\t\t\t\t\tif(seed_x>0.){\n\t\t\t\t\t\tp.y = 1. - (p.y + distortion_y);\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tp.y = distortion_y;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tif(p.x<distortion_y+col_s && p.x>distortion_y-col_s*seed) {\n\t\t\t\t\tif(seed_y>0.){\n\t\t\t\t\t\tp.x=distortion_x;\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tp.x = 1. - (p.x + distortion_x);\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tp.x+=normal.x*seed_x*(seed/5.);\n\t\t\t\tp.y+=normal.y*seed_y*(seed/5.);\n\t\t\t\t//base from RGB shift shader\n\t\t\t\tvec2 offset = amount * vec2( cos(angle), sin(angle));\n\t\t\t\tvec4 cr = texture2D(tDiffuse, p + offset);\n\t\t\t\tvec4 cga = texture2D(tDiffuse, p);\n\t\t\t\tvec4 cb = texture2D(tDiffuse, p - offset);\n\t\t\t\tgl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);\n\t\t\t\t//add noise\n\t\t\t\tvec4 snow = 200.*amount*vec4(rand(vec2(xs * seed,ys * seed*50.))*0.2);\n\t\t\t\tgl_FragColor = gl_FragColor+ snow;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tgl_FragColor=texture2D (tDiffuse, vUv);\n\t\t\t}\n\t\t}"
  };
  _exports.DigitalGlitch = DigitalGlitch;
});