Auralis

1"use client";
2 
3import { useEffect, useRef } from "react";
4import { cn } from "@/lib/utils";
5 
6const vertexShaderGLSL = `
7attribute vec2 position;
8varying vec2 vUv;
9void main() {
10  vUv = position * 0.5 + 0.5;
11  gl_Position = vec4(position, 0.0, 1.0);
12}
13`;
14 
15const fragmentShaderGLSL = `
16precision highp float;
17varying vec2 vUv;
18 
19uniform vec2  u_resolution;
20uniform float u_time;
21uniform float u_grain;
22uniform vec3  u_colors[3];
23 
24vec3 mod289(vec3 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
25vec2 mod289(vec2 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
26vec3 permute(vec3 x) { return mod289(((x*34.0)+1.0)*x); }
27 
28float snoise(vec2 v) {
29  const vec4 C = vec4(0.211324865405187, 0.366025403784439, -0.577350269189626, 0.024390243902439);
30  vec2 i  = floor(v + dot(v, C.yy));
31  vec2 x0 = v - i + dot(i, C.xx);
32  vec2 i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
33  vec4 x12 = x0.xyxy + C.xxzz;
34  x12.xy -= i1;
35  i = mod289(i);
36  vec3 p = permute(permute(i.y + vec3(0.0, i1.y, 1.0)) + i.x + vec3(0.0, i1.x, 1.0));
37  vec3 m = max(0.5 - vec3(dot(x0,x0), dot(x12.xy,x12.xy), dot(x12.zw,x12.zw)), 0.0);
38  m = m*m; m = m*m;
39  vec3 x = 2.0 * fract(p * C.www) - 1.0;
40  vec3 h = abs(x) - 0.5;
41  vec3 ox = floor(x + 0.5);
42  vec3 a0 = x - ox;
43  m *= 1.79284291400159 - 0.85373472095314 * (a0*a0 + h*h);
44  vec3 g;
45  g.x  = a0.x  * x0.x  + h.x  * x0.y;
46  g.yz = a0.yz * x12.xz + h.yz * x12.yw;
47  return 130.0 * dot(m, g);
48}
49 
50void main() {
51  vec2 uv = vUv;
52  float ratio = u_resolution.x / u_resolution.y;
53  vec2 p = uv * vec2(ratio, 1.0);
54  float t = u_time * 0.2;
55 
56  float n1 = snoise(p * 0.5 + t);
57  float n2 = snoise(p * 0.9 - t * 0.5 + n1);
58  
59  float light = pow(abs(n2), 2.5) * 0.5; 
60 
61  vec3 col = vec3(0.02, 0.01, 0.01); 
62 
63  col += u_colors[0] * smoothstep(0.1, 1.0, n1) * 0.5;
64  col += u_colors[1] * light;
65 
66  float grain = fract(sin(dot(uv, vec2(12.9898, 78.233))) * 43758.5453 + u_time);
67  col += (grain - 0.5) * u_grain * 0.5;
68 
69  float dist = length(uv - 0.5);
70  col *= smoothstep(1.2, 0.2, dist);
71 
72  gl_FragColor = vec4(col, 1.0);
73}
74`;
75 
76export interface AuralisProps {
77  colors?: string[];
78  speed?: number;
79  grain?: number;
80  height?: string;
81  className?: string;
82}
83 
84const DEFAULT_COLORS = ["#ef4444", "#dc2626", "#b91c1c"];
85 
86const Auralis = ({
87  colors = DEFAULT_COLORS,
88  speed = 0.3,
89  grain = 0.6,
90  height = "100vh",
91  className,
92}: AuralisProps) => {
93  const canvasRef = useRef<HTMLCanvasElement | null>(null);
94  const containerRef = useRef<HTMLDivElement | null>(null);
95 
96// … truncated