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webgl2_buffergeometry_attributes_none.html
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webgl2_buffergeometry_attributes_none.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js WebGL 2 - buffergeometry - attributes - none</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="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> WebGL 2 - buffergeometry - attributes - none</div>
<script id="vertexShader" type="x-shader/x-vertex">
uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
uniform float seed;
const uint ieeeMantissa = 0x007FFFFFu;
const uint ieeeOne = 0x3F800000u;
uint hash(uint x) {
x += ( x << 10u );
x ^= ( x >> 6u );
x += ( x << 3u );
x ^= ( x >> 11u );
x += ( x << 15u );
return x;
}
uint hash(uvec2 v) { return hash( v.x ^ hash(v.y) ); }
float hashNoise(vec2 xy) {
uint m = hash(floatBitsToUint(xy));
m &= ieeeMantissa;
m |= ieeeOne;
return uintBitsToFloat( m ) - 1.0;
}
float pseudoRandom(float lower, float delta, in vec2 xy) {
return lower + delta*hashNoise(xy);
}
vec3 pseudoRandomVec3(float lower, float upper, int index) {
float delta = upper - lower;
float x = pseudoRandom(lower, delta, vec2(index, 0));
float y = pseudoRandom(lower, delta, vec2(index, 1));
float z = pseudoRandom(lower, delta, vec2(index, 2));
return vec3(x, y, z);
}
out vec3 vColor;
void main() {
const float scale = 1.0/64.0;
vec3 position = pseudoRandomVec3(-1.0, +1.0, gl_VertexID/3) + scale * pseudoRandomVec3(-1.0, +1.0, gl_VertexID);
vec3 color = pseudoRandomVec3(0.25, 1.0, gl_VertexID/3);
gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0 );
vColor = color;
}
</script>
<script id="fragmentShader" type="x-shader/x-fragment">
precision mediump float;
in vec3 vColor;
out vec4 fColor;
void main() {
fColor = vec4(vColor, 1);
}
</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": "https://code4fukui.github.io/three.js/build/three.module.js",
"three/addons/": "https://code4fukui.github.io/three.js/examples/jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import WebGL from 'three/addons/capabilities/WebGL.js';
if ( WebGL.isWebGL2Available() === false ) {
document.body.appendChild( WebGL.getWebGL2ErrorMessage() );
}
let camera, scene, renderer, mesh;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
camera.position.z = 4;
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x050505 );
scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
// geometry
const triangleCount = 10000;
const vertexCountPerTriangle = 3;
const vertexCount = triangleCount * vertexCountPerTriangle;
const geometry = new THREE.BufferGeometry();
geometry.setDrawRange( 0, vertexCount );
// material
const material = new THREE.RawShaderMaterial( {
uniforms: {
seed: { value: 42 },
},
vertexShader: document.getElementById( 'vertexShader' ).textContent,
fragmentShader: document.getElementById( 'fragmentShader' ).textContent,
side: THREE.DoubleSide,
glslVersion: THREE.GLSL3
} );
// mesh
mesh = new THREE.Mesh( geometry, material );
mesh.frustumCulled = false;
scene.add( mesh );
// renderer
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
}
function animate( time ) {
requestAnimationFrame( animate );
mesh.rotation.x = time / 1000.0 * 0.25;
mesh.rotation.y = time / 1000.0 * 0.50;
renderer.render( scene, camera );
}
</script>
</body>
</html>