forked from mrdoob/three.js
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathwebgl_buffergeometry_instancing_interleaved_dynamic.html
325 lines (227 loc) · 7.59 KB
/
webgl_buffergeometry_instancing_interleaved_dynamic.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - indexed instancing (single box), interleaved buffers, dynamic updates</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
color: #ffffff;
font-family: Monospace;
font-size: 13px;
text-align: center;
font-weight: bold;
background-color: #000000;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px;
width: 100%;
padding: 5px;
}
a {
color: #ffffff;
}
#webglmessage a {
color: #da0;
}
#notSupported {
width: 50%;
margin: auto;
border: 2px red solid;
margin-top: 20px;
padding: 10px;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info">
<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - indexed instancing (single box), interleaved buffers, dynamic updates
<div id="notSupported" style="display:none">Sorry your graphics card + browser does not support hardware instancing</div>
</div>
<script src="../build/three.js"></script>
<script src="js/WebGL.js"></script>
<script src="js/libs/stats.min.js"></script>
<script id="vertexShader" type="x-shader/x-vertex">
precision highp float;
uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
attribute vec3 position;
attribute vec3 offset;
attribute vec2 uv;
attribute vec4 orientation;
varying vec2 vUv;
// http://www.geeks3d.com/20141201/how-to-rotate-a-vertex-by-a-quaternion-in-glsl/
vec3 applyQuaternionToVector( vec4 q, vec3 v ){
return v + 2.0 * cross( q.xyz, cross( q.xyz, v ) + q.w * v );
}
void main() {
vec3 vPosition = applyQuaternionToVector( orientation, position );
vUv = uv;
gl_Position = projectionMatrix * modelViewMatrix * vec4( offset + vPosition, 1.0 );
}
</script>
<script id="fragmentShader" type="x-shader/x-fragment">
precision highp float;
uniform sampler2D map;
varying vec2 vUv;
void main() {
gl_FragColor = texture2D(map, vUv);
}
</script>
<script>
if ( WEBGL.isWebGLAvailable() === false ) {
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
}
var container, stats;
var camera, scene, renderer;
var orientations, instanceBuffer;
function init() {
container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x101010 );
renderer = new THREE.WebGLRenderer();
// geometry
var instances = 5000;
var geometry = new THREE.InstancedBufferGeometry();
// per mesh data x,y,z,w,u,v,s,t for 4-element alignment
// only use x,y,z and u,v; but x, y, z, nx, ny, nz, u, v would be a good layout
var vertexBuffer = new THREE.InterleavedBuffer( new Float32Array( [
// Front
- 1, 1, 1, 0, 0, 0, 0, 0,
1, 1, 1, 0, 1, 0, 0, 0,
- 1, - 1, 1, 0, 0, 1, 0, 0,
1, - 1, 1, 0, 1, 1, 0, 0,
// Back
1, 1, - 1, 0, 1, 0, 0, 0,
- 1, 1, - 1, 0, 0, 0, 0, 0,
1, - 1, - 1, 0, 1, 1, 0, 0,
- 1, - 1, - 1, 0, 0, 1, 0, 0,
// Left
- 1, 1, - 1, 0, 1, 1, 0, 0,
- 1, 1, 1, 0, 1, 0, 0, 0,
- 1, - 1, - 1, 0, 0, 1, 0, 0,
- 1, - 1, 1, 0, 0, 0, 0, 0,
// Right
1, 1, 1, 0, 1, 0, 0, 0,
1, 1, - 1, 0, 1, 1, 0, 0,
1, - 1, 1, 0, 0, 0, 0, 0,
1, - 1, - 1, 0, 0, 1, 0, 0,
// Top
- 1, 1, 1, 0, 0, 0, 0, 0,
1, 1, 1, 0, 1, 0, 0, 0,
- 1, 1, - 1, 0, 0, 1, 0, 0,
1, 1, - 1, 0, 1, 1, 0, 0,
// Bottom
1, - 1, 1, 0, 1, 0, 0, 0,
- 1, - 1, 1, 0, 0, 0, 0, 0,
1, - 1, - 1, 0, 1, 1, 0, 0,
- 1, - 1, - 1, 0, 0, 1, 0, 0
] ), 8 );
// Use vertexBuffer, starting at offset 0, 3 items in position attribute
var positions = new THREE.InterleavedBufferAttribute( vertexBuffer, 3, 0 );
geometry.addAttribute( 'position', positions );
// Use vertexBuffer, starting at offset 4, 2 items in uv attribute
var uvs = new THREE.InterleavedBufferAttribute( vertexBuffer, 2, 4 );
geometry.addAttribute( 'uv', uvs );
var indices = new Uint16Array( [
0, 1, 2,
2, 1, 3,
4, 5, 6,
6, 5, 7,
8, 9, 10,
10, 9, 11,
12, 13, 14,
14, 13, 15,
16, 17, 18,
18, 17, 19,
20, 21, 22,
22, 21, 23
] );
geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
// per instance data
instanceBuffer = new THREE.InstancedInterleavedBuffer( new Float32Array( instances * 8 ), 8, 1 ).setDynamic( true );
var offsets = new THREE.InterleavedBufferAttribute( instanceBuffer, 3, 0 );
var vector = new THREE.Vector4();
for ( var i = 0, ul = offsets.count; i < ul; i ++ ) {
var x = Math.random() * 100 - 50;
var y = Math.random() * 100 - 50;
var z = Math.random() * 100 - 50;
vector.set( x, y, z, 0 ).normalize();
// move out at least 5 units from center in current direction
offsets.setXYZ( i, x + vector.x * 5, y + vector.y * 5, z + vector.z * 5 );
}
geometry.addAttribute( 'offset', offsets ); // per mesh translation
orientations = new THREE.InterleavedBufferAttribute( instanceBuffer, 4, 4 );
for ( var i = 0, ul = orientations.count; i < ul; i ++ ) {
vector.set( Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1 );
vector.normalize();
orientations.setXYZW( i, vector.x, vector.y, vector.z, vector.w );
}
geometry.addAttribute( 'orientation', orientations ); // per mesh orientation
// material
var texture = new THREE.TextureLoader().load( 'textures/crate.gif' );
texture.anisotropy = renderer.capabilities.getMaxAnisotropy();
var material = new THREE.RawShaderMaterial( {
uniforms: {
map: { value: texture }
},
vertexShader: document.getElementById( 'vertexShader' ).textContent,
fragmentShader: document.getElementById( 'fragmentShader' ).textContent,
side: THREE.DoubleSide,
transparent: false
} );
var mesh = new THREE.Mesh( geometry, material );
mesh.frustumCulled = false;
scene.add( mesh );
if ( renderer.extensions.get( 'ANGLE_instanced_arrays' ) === null ) {
document.getElementById( "notSupported" ).style.display = "";
return;
}
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, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
var lastTime = 0;
var moveQ = ( new THREE.Quaternion( .5, .5, .5, 0.0 ) ).normalize();
var tmpQ = new THREE.Quaternion();
var currentQ = new THREE.Quaternion();
function render() {
var time = performance.now();
var object = scene.children[ 0 ];
object.rotation.y = time * 0.00005;
renderer.render( scene, camera );
var delta = ( time - lastTime ) / 5000;
tmpQ.set( moveQ.x * delta, moveQ.y * delta, moveQ.z * delta, 1 ).normalize();
for ( var i = 0, ul = orientations.count; i < ul; i ++ ) {
var index = i * instanceBuffer.stride + orientations.offset;
currentQ.set( instanceBuffer.array[ index ], instanceBuffer.array[ index + 1 ], instanceBuffer.array[ index + 2 ], instanceBuffer.array[ index + 3 ] );
currentQ.multiply( tmpQ );
orientations.setXYZW( i, currentQ.x, currentQ.y, currentQ.z, currentQ.w );
}
instanceBuffer.needsUpdate = true;
lastTime = time;
}
init();
animate();
</script>
</body>
</html>