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