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194 lines
4.3 KiB
194 lines
4.3 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - raw shader</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="container"></div>
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<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - raw shader demo</div>
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<script id="vertexShader" type="x-shader/x-vertex">
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precision mediump float;
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precision mediump int;
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uniform mat4 modelViewMatrix; // optional
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uniform mat4 projectionMatrix; // optional
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attribute vec3 position;
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attribute vec4 color;
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varying vec3 vPosition;
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varying vec4 vColor;
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void main() {
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vPosition = position;
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vColor = color;
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gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
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}
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</script>
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<script id="fragmentShader" type="x-shader/x-fragment">
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precision mediump float;
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precision mediump int;
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uniform float time;
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varying vec3 vPosition;
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varying vec4 vColor;
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void main() {
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vec4 color = vec4( vColor );
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color.r += sin( vPosition.x * 10.0 + time ) * 0.5;
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gl_FragColor = color;
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}
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</script>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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let container, stats;
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let camera, scene, renderer;
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init();
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animate();
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function init() {
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container = document.getElementById( 'container' );
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camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10 );
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camera.position.z = 2;
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scene = new THREE.Scene();
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scene.background = new THREE.Color( 0x101010 );
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// geometry
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// nr of triangles with 3 vertices per triangle
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const vertexCount = 200 * 3;
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const geometry = new THREE.BufferGeometry();
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const positions = [];
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const colors = [];
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for ( let i = 0; i < vertexCount; i ++ ) {
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// adding x,y,z
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positions.push( Math.random() - 0.5 );
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positions.push( Math.random() - 0.5 );
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positions.push( Math.random() - 0.5 );
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// adding r,g,b,a
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colors.push( Math.random() * 255 );
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colors.push( Math.random() * 255 );
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colors.push( Math.random() * 255 );
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colors.push( Math.random() * 255 );
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}
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const positionAttribute = new THREE.Float32BufferAttribute( positions, 3 );
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const colorAttribute = new THREE.Uint8BufferAttribute( colors, 4 );
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colorAttribute.normalized = true; // this will map the buffer values to 0.0f - +1.0f in the shader
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geometry.setAttribute( 'position', positionAttribute );
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geometry.setAttribute( 'color', colorAttribute );
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// material
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const material = new THREE.RawShaderMaterial( {
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uniforms: {
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time: { value: 1.0 }
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},
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vertexShader: document.getElementById( 'vertexShader' ).textContent,
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fragmentShader: document.getElementById( 'fragmentShader' ).textContent,
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side: THREE.DoubleSide,
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transparent: true
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} );
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const mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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container.appendChild( renderer.domElement );
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stats = new Stats();
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container.appendChild( stats.dom );
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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const time = performance.now();
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const object = scene.children[ 0 ];
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object.rotation.y = time * 0.0005;
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object.material.uniforms.time.value = time * 0.005;
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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