vertexShader.js

const vertexShader = `
#define GLSLIFY 1
//
// Description : Array and textureless GLSL 2D/3D/4D simplex
//               noise functions.
//      Author : Ian McEwan, Ashima Arts.
//  Maintainer : ijm
//     Lastmod : 20110822 (ijm)
//     License : Copyright (C) 2011 Ashima Arts. All rights reserved.
//               Distributed under the MIT License. See LICENSE file.
//               https://github.com/ashima/webgl-noise
//

vec3 mod289(vec3 x) {
  return x - floor(x * (1.0 / 289.0)) * 289.0;
}

vec4 mod289(vec4 x) {
  return x - floor(x * (1.0 / 289.0)) * 289.0;
}

vec4 permute(vec4 x) {
     return mod289(((x*34.0)+1.0)*x);
}

vec4 taylorInvSqrt(vec4 r)
{
  return 1.79284291400159 - 0.85373472095314 * r;
}

float snoise(vec3 v)
  {
  const vec2  C = vec2(1.0/6.0, 1.0/3.0) ;
  const vec4  D = vec4(0.0, 0.5, 1.0, 2.0);

// First corner
  vec3 i  = floor(v + dot(v, C.yyy) );
  vec3 x0 =   v - i + dot(i, C.xxx) ;

// Other corners
  vec3 g = step(x0.yzx, x0.xyz);
  vec3 l = 1.0 - g;
  vec3 i1 = min( g.xyz, l.zxy );
  vec3 i2 = max( g.xyz, l.zxy );

  //   x0 = x0 - 0.0 + 0.0 * C.xxx;
  //   x1 = x0 - i1  + 1.0 * C.xxx;
  //   x2 = x0 - i2  + 2.0 * C.xxx;
  //   x3 = x0 - 1.0 + 3.0 * C.xxx;
  vec3 x1 = x0 - i1 + C.xxx;
  vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.y
  vec3 x3 = x0 - D.yyy;      // -1.0+3.0*C.x = -0.5 = -D.y

// Permutations
  i = mod289(i);
  vec4 p = permute( permute( permute(
             i.z + vec4(0.0, i1.z, i2.z, 1.0 ))
           + i.y + vec4(0.0, i1.y, i2.y, 1.0 ))
           + i.x + vec4(0.0, i1.x, i2.x, 1.0 ));

// Gradients: 7x7 points over a square, mapped onto an octahedron.
// The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294)
  float n_ = 0.142857142857; // 1.0/7.0
  vec3  ns = n_ * D.wyz - D.xzx;

  vec4 j = p - 49.0 * floor(p * ns.z * ns.z);  //  mod(p,7*7)

  vec4 x_ = floor(j * ns.z);
  vec4 y_ = floor(j - 7.0 * x_ );    // mod(j,N)

  vec4 x = x_ *ns.x + ns.yyyy;
  vec4 y = y_ *ns.x + ns.yyyy;
  vec4 h = 1.0 - abs(x) - abs(y);

  vec4 b0 = vec4( x.xy, y.xy );
  vec4 b1 = vec4( x.zw, y.zw );

  //vec4 s0 = vec4(lessThan(b0,0.0))*2.0 - 1.0;
  //vec4 s1 = vec4(lessThan(b1,0.0))*2.0 - 1.0;
  vec4 s0 = floor(b0)*2.0 + 1.0;
  vec4 s1 = floor(b1)*2.0 + 1.0;
  vec4 sh = -step(h, vec4(0.0));

  vec4 a0 = b0.xzyw + s0.xzyw*sh.xxyy ;
  vec4 a1 = b1.xzyw + s1.xzyw*sh.zzww ;

  vec3 p0 = vec3(a0.xy,h.x);
  vec3 p1 = vec3(a0.zw,h.y);
  vec3 p2 = vec3(a1.xy,h.z);
  vec3 p3 = vec3(a1.zw,h.w);

//Normalise gradients
  vec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3)));
  p0 *= norm.x;
  p1 *= norm.y;
  p2 *= norm.z;
  p3 *= norm.w;

// Mix final noise value
  vec4 m = max(0.6 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0);
  m = m * m;
  return 42.0 * dot( m*m, vec4( dot(p0,x0), dot(p1,x1),
                                dot(p2,x2), dot(p3,x3) ) );
  }

const float PI = 3.14159265359;

vec4 getWorldNormal(mat4 modelMat,vec3 normal){
    vec4 worldNormal=normalize((modelMat*vec4(normal,0.)));
    return worldNormal;
}

uniform float uTime;
uniform vec2 uMouse;

varying vec2 vUv;
varying vec3 vWorldNormal;

vec3 distort(vec3 p){
    vec3 pointDirection=normalize(p);
    vec3 mousePoint=vec3(uMouse,1.);
    vec3 mouseDirection=normalize(mousePoint);
    float mousePointAngle=dot(pointDirection,mouseDirection);
    
    float freq=1.5;
    float t=uTime*100.;
    
    float f=PI*freq;
    float fc=mousePointAngle*f;
    
    vec3 n11=pointDirection*1.5;
    vec3 n12=vec3(uTime)*4.;
    float dist=smoothstep(.4,1.,mousePointAngle);
    float n1a=dist*2.;
    float noise1=snoise(n11+n12)*n1a;
    
    vec3 n21=pointDirection*1.5;
    vec3 n22=vec3(0.,0.,uTime)*2.;
    vec3 n23=vec3(uMouse,0.)*.2;
    float n2a=.8;
    float noise2=snoise(n21+n22+n23)*n2a;
    
    float mouseN1=sin(fc+PI+t);
    float mouseN2=smoothstep(f,f*2.,fc+t);
    float mouseN3=smoothstep(f*2.,f,fc+t);
    float mouseNa=4.;
    float mouseNoise=mouseN1*mouseN2*mouseN3*mouseNa;
    
    float noise=noise1+noise2+mouseNoise;
    vec3 distortion=pointDirection*(noise+length(p));
    return distortion;
}

// http://lolengine.net/blog/2013/09/21/picking-orthogonal-vector-combing-coconuts
vec3 orthogonal(vec3 v){
    return normalize(abs(v.x)>abs(v.z)?vec3(-v.y,v.x,0.)
    :vec3(0.,-v.z,v.y));
}

// https://codepen.io/marco_fugaro/pen/xxZWPWJ?editors=0010
vec3 fixNormal(vec3 position,vec3 distortedPosition,vec3 normal){
    vec3 tangent=orthogonal(normal);
    vec3 bitangent=normalize(cross(normal,tangent));
    float offset=.1;
    vec3 neighbour1=position+tangent*offset;
    vec3 neighbour2=position+bitangent*offset;
    vec3 displacedNeighbour1=distort(neighbour1);
    vec3 displacedNeighbour2=distort(neighbour2);
    vec3 displacedTangent=displacedNeighbour1-distortedPosition;
    vec3 displacedBitangent=displacedNeighbour2-distortedPosition;
    vec3 displacedNormal=normalize(cross(displacedTangent,displacedBitangent));
    return displacedNormal;
}

void main(){
    vec3 pos=position;
    pos=distort(pos);
    vec4 modelPosition=modelMatrix*vec4(pos,1.);
    vec4 viewPosition=viewMatrix*modelPosition;
    vec4 projectedPosition=projectionMatrix*viewPosition;
    gl_Position=projectedPosition;
    
    vec3 distortedNormal=fixNormal(position,pos,normal);
    
    vUv=uv;
    vWorldNormal=getWorldNormal(modelMatrix,distortedNormal).xyz;
}
`;

export default vertexShader;