1#version 300 es2precision highp float;3in vec2 v_uv;4uniform vec2 u_res;5uniform float u_time;6uniform float u_params[4];7uniform sampler2D u_texture;8out vec4 fragColor;910float hash(vec2 p) {11  return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453);12}13float hash21(vec2 p) {14  p = fract(p * vec2(234.34, 435.345));15  p += dot(p, p + 34.23);16  return fract(p.x * p.y);17}1819float noise2(vec2 p) {20  vec2 i = floor(p);21  vec2 f = fract(p);22  f = f * f * (3.0 - 2.0 * f);23  return mix(mix(hash(i), hash(i + vec2(1,0)), f.x),24             mix(hash(i + vec2(0,1)), hash(i + vec2(1,1)), f.x), f.y);25}26void main() {27  float s = u_params[0], sc = u_params[1], i = u_params[2], m = u_params[3];28  vec2 uv = v_uv * sc;29  float t = u_time * s;30  float n = noise2(uv + t * 0.1);31  n += noise2(uv * 2.0 - t * 0.15) * 0.5;32  n += noise2(uv * 4.0 + t * 0.2) * 0.25;33  n /= 1.75;34  vec3 cA = vec3(0.91,0.87,0.82), cB = vec3(0.09,0.09,0.07), cC = vec3(0.23,0.42,0.65);35  vec3 col = mix(cA, cB, n * i);36  col = mix(col, cC, n * m * 0.3);37  fragColor = vec4(col, 1.0);38}