Code Playground

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <canvas id="glcanvas"></canvas>
  <script id="vertex-shader" type="x-shader/x-vertex">
    attribute vec2 a_position;
    void main() {
      gl_Position = vec4(a_position, 0.0, 1.0);
    }
  </script>
<script id="fragment-shader" type="x-shader/x-fragment">
#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
float PI = 3.14;
  
float oscillate(float time, float minVal, float maxVal) {
    float sineWave = sin(time);
    float normalizedSine = (sineWave + 1.0) / 2.0;
    return mix(minVal, maxVal, normalizedSine);
}

vec2 rotate(vec2 pos, float angle) {
    float cosAngle = cos(angle);
    float sinAngle = sin(angle);
    mat2 rotationMatrix = mat2(cosAngle, -sinAngle, sinAngle, cosAngle);
    return rotationMatrix * pos;
}
vec3 palette( float t ) {
    vec3 a = vec3(0.5, 0.5, 0.0);
    vec3 b = vec3(0.5, 0.5, 0.5);
    vec3 c = vec3(1.0, 1.0, 1.0);
    vec3 d = vec3(0.25,0.4,0.55);

return a + b*cos( 6.28318*(c*t+d) );
}
float hash(vec2 p) {
    return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453123);
}
float noise(vec2 p) {
    vec2 i = floor(p);
    vec2 f = fract(p);
    vec2 u = f * f * (3.0 - 2.0 * f);
    
    return mix(mix(hash(i + vec2(0.0, 0.0)), hash(i + vec2(1.0, 0.0)), u.x),
               mix(hash(i + vec2(0.0, 1.0)), hash(i + vec2(1.0, 1.0)), u.x),
               u.y);
}

vec2 warp(vec2 p) {
    vec2 offset = vec2(noise(p + p.y), noise(p + p.x));
    return p + offset;
}

float tile(vec2 position) {
    position *= 2.0;
    position = fract(position) - 0.5;
    vec2 p = abs(position);

float d1 = dot(p, vec2(0.0, 0.0));
    float d2 = max(p.x + u_time/5.0, p.y + u_time/5.0);

return max(d1, d2);
}

void main() {
    vec2 st = gl_FragCoord.xy / u_resolution.xy * 2.0 - 1.0;
    st.x *= u_resolution.x / u_resolution.y;
    st *= 3.0;
    st = warp(st);
    st = rotate(st, u_time/10.0);
    vec3 finalColor = vec3(0.0);

float sq = tile(st);
    finalColor = palette(sq * 0.4 - exp(length(st * 0.1)));
    gl_FragColor = vec4(finalColor,1.0);
}
</script>
</body>
</html>

console.log("Event Fired")
const canvas = document.getElementById('glcanvas');
const gl = canvas.getContext('webgl2') || canvas.getContext('webgl');

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

function getShaderSource(id) {
  return document.getElementById(id).textContent;
}

const vertexShaderSource = getShaderSource('vertex-shader');
const fragmentShaderSource = getShaderSource('fragment-shader');

function createShader(gl, type, source) {
  const shader = gl.createShader(type);
  gl.shaderSource(shader, source);
  gl.compileShader(shader);
  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    console.error('An error occurred compiling the shaders:', gl.getShaderInfoLog(shader));
    gl.deleteShader(shader);
    return null;
  }
  return shader;
}

function createProgram(gl, vertexShader, fragmentShader) {
  const program = gl.createProgram();
  gl.attachShader(program, vertexShader);
  gl.attachShader(program, fragmentShader);
  gl.linkProgram(program);
  if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
    console.error('Unable to initialize the shader program:', gl.getProgramInfoLog(program));
    return null;
  }
  return program;
}

const vertexShader = createShader(gl, gl.VERTEX_SHADER, vertexShaderSource);
const fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fragmentShaderSource);
const program = createProgram(gl, vertexShader, fragmentShader);

const positionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
const positions = [
  -1.0, -1.0,
   1.0, -1.0,
  -1.0,  1.0,
   1.0,  1.0,
];
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);

const positionLocation = gl.getAttribLocation(program, 'a_position');
gl.enableVertexAttribArray(positionLocation);
gl.vertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0);

gl.useProgram(program);

const resolutionLocation = gl.getUniformLocation(program, 'u_resolution');
const timeLocation = gl.getUniformLocation(program, 'u_time');

gl.clearColor(0, 0, 0, 1); 
gl.clear(gl.COLOR_BUFFER_BIT);

let startTime = null;

function render(time) {
  if (!startTime) startTime = time; // Set the start time only once.
  
  const elapsedTime = (time - startTime) * 0.001; // Convert time to seconds.
  
  gl.uniform2f(resolutionLocation, canvas.width, canvas.height);
  gl.uniform1f(timeLocation, elapsedTime); // Pass elapsed time to the shader.
  gl.clear(gl.COLOR_BUFFER_BIT);
  gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
  requestAnimationFrame(render);
}

resize();
function resize() {
  const devicePixelRatio = Math.min(window.devicePixelRatio || 1, 2);
  canvas.width = Math.floor(window.innerWidth * devicePixelRatio);
  canvas.height = Math.floor(window.innerHeight * devicePixelRatio);
  gl.viewport(0, 0, canvas.width, canvas.height);
  canvas.style.width = window.innerWidth + "px";
  canvas.style.height = window.innerHeight + "px";
  document.documentElement.requestFullscreen();
}

window.addEventListener('resize', resize);

requestAnimationFrame(render);

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