-
Notifications
You must be signed in to change notification settings - Fork 5
/
particles.html
485 lines (411 loc) · 16.4 KB
/
particles.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
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="css/example.css">
</head>
<!--
The MIT License (MIT)
Copyright (c) 2020 Tarek Sherif
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-->
<body>
<canvas id="webgpu-canvas"></canvas>
<div id="stats">
<div id="device-info"></div>
<div>
CPU Frame Time: <span id="cpu-time"></span>
</div>
<div>
GPU Compute Time: <span id="compute-time"></span>
</div>
<div>
GPU Draw Time: <span id="draw-time"></span>
</div>
</div>
<script type="module">
import { checkSupport, addDescription, parseAdapterInfo } from "./utils/utils.js";
import { Timer } from "./utils/Timer.js";
const WORKGROUP_SIZE = 64;
const NUM_WORKGROUPS = 1000;
const NUM_PARTICLES = WORKGROUP_SIZE * NUM_WORKGROUPS;
const PARTICLE_SIZE = 2;
checkSupport();
addDescription(
"Particles",
`Using a compute shader to simulate gravity on ${NUM_PARTICLES} instanced quad particles.`,
"particles.html"
);
(async () => {
//////////////////////////////////////////
// Set up WebGPU adapter
//////////////////////////////////////////
const adapter = await navigator.gpu.requestAdapter();
const presentationFormat = navigator.gpu.getPreferredCanvasFormat(adapter);
////////////////////////////////////
// Set up device and canvas context
////////////////////////////////////
const [adapterInfo, device] = await Promise.all([
adapter.requestAdapterInfo(),
adapter.requestDevice({
requiredFeatures: adapter.features.has("timestamp-query") ? ["timestamp-query"] : []
})
]);
const canvas = document.getElementById("webgpu-canvas");
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
const context = canvas.getContext("webgpu");
context.configure({
device,
format: presentationFormat
});
document.getElementById("device-info").innerText = parseAdapterInfo(adapterInfo);
const timer = new Timer(device);
const cpuTimeDisplay = document.getElementById("cpu-time");
const computeTimeDisplay = document.getElementById("compute-time");
const drawTimeDisplay = document.getElementById("draw-time");
////////////////////////////////////////////////////////
// Create buffers for compute pass
// (positionBuffer also used in render pass)
////////////////////////////////////////////////////////
const positionBuffer = device.createBuffer({
size: 16 * NUM_PARTICLES,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST | GPUBufferUsage.STORAGE,
});
const positionBufferData = new Float32Array(NUM_PARTICLES * 4);
for (let i = 0; i < positionBufferData.length; i += 4) {
positionBufferData[i] = Math.random() * 2 - 1;
positionBufferData[i + 1] = Math.random() * 2 - 1;
positionBufferData[i + 2] = Math.random() * 2 - 1;
positionBufferData[i + 3] = 1;
}
device.queue.writeBuffer(positionBuffer, 0, positionBufferData);
const velocityBuffer = device.createBuffer({
size: 16 * NUM_PARTICLES,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST | GPUBufferUsage.STORAGE,
});
const velocityBufferData = new Float32Array(NUM_PARTICLES * 4);
for (let i = 0; i < velocityBufferData.length; i += 4) {
velocityBufferData[i] = Math.random() * 0.002 - 0.001;
velocityBufferData[i + 1] = Math.random() * 0.002 - 0.001;
velocityBufferData[i + 2] = Math.random() * 0.002 - 0.001;
velocityBufferData[i + 3] = 0;
}
device.queue.writeBuffer(velocityBuffer, 0, velocityBufferData);
///////////////////////////////////
// Create compute shader module
//////////////////////////////////
const computeShaderModule = device.createShaderModule({
code: `
struct Mass {
position1: vec4f,
position2: vec4f,
position3: vec4f,
factor1: f32,
factor2: f32,
factor3: f32
};
@group(0) @binding(0) var<storage, read_write> positions: array<vec4f>;
@group(0) @binding(1) var<storage, read_write> velocities: array<vec4f>;
@group(0) @binding(2) var<uniform> mass: Mass;
@compute @workgroup_size(${WORKGROUP_SIZE})
fn cs(@builtin(global_invocation_id) global_id: vec3u) {
let index = global_id.x;
let position = positions[index].xyz;
var velocity = velocities[index].xyz;
var massVec = mass.position1.xyz - position;
var massDist2 = max(0.01, dot(massVec, massVec));
var acceleration = mass.factor1 * normalize(massVec) / massDist2;
massVec = mass.position2.xyz - position;
massDist2 = max(0.01, dot(massVec, massVec));
acceleration += mass.factor2 * normalize(massVec) / massDist2;
massVec = mass.position3.xyz - position;
massDist2 = max(0.01, dot(massVec, massVec));
acceleration += mass.factor3 * normalize(massVec) / massDist2;
velocity += acceleration;
velocity *= 0.9999;
positions[index] = vec4f(position + velocity, 1);
velocities[index] = vec4f(velocity, 0);
}
`
})
const computePipeline = device.createComputePipeline({
layout: "auto",
compute: {
module: computeShaderModule,
entryPoint: "cs"
}
});
//////////////////////////
// Compute uniform buffer
//////////////////////////
const computeUniformData = new Float32Array([
Math.random() * 2.0 - 1.0, Math.random() * 2.0 - 1.0, 0, 1.0, // Mass 1 position
Math.random() * 2.0 - 1.0, Math.random() * 2.0 - 1.0, 0, 1.0, // Mass 2 position
Math.random() * 2.0 - 1.0, Math.random() * 2.0 - 1.0, 0, 1.0, // Mass 3 position
Math.random() / 30000, Math.random() / 30000, Math.random() / 30000, 0 // Mass factors
]);
const computeUniformBuffer = device.createBuffer({
size: computeUniformData.byteLength,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(computeUniformBuffer, 0, computeUniformData);
////////////////////////
// Compute bind group
////////////////////////
const computeBindGroup = device.createBindGroup({
layout: computePipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: {
buffer: positionBuffer
}
},
{
binding: 1,
resource: {
buffer: velocityBuffer
}
},
{
binding: 2,
resource: {
buffer: computeUniformBuffer
}
}
]
});
const computePassDescription = {
timestampWrites: timer.gpuPassDescriptor("compute")
};
///////////////////////////////////
// Create buffers for render pass
///////////////////////////////////
const vertexBuffer = device.createBuffer({
size: 32,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(vertexBuffer, 0, new Float32Array([
-1.0, -1.0,
1.0, -1.0,
-1.0, 1.0,
1.0, 1.0
]));
const colorBuffer = device.createBuffer({
size: 4 * NUM_PARTICLES,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST,
});
const colorBufferData = new Uint8Array(4 * NUM_PARTICLES);
for (let i = 0; i < colorBufferData.length; i += 4) {
colorBufferData[i] = Math.floor(Math.random() * 256);
colorBufferData[i + 1] = Math.floor(Math.random() * 256);
colorBufferData[i + 2] = Math.floor(Math.random() * 256);
colorBufferData[i + 3] = 128;
}
device.queue.writeBuffer(colorBuffer, 0, colorBufferData);
/////////////////////////////////
// Create render shader module
/////////////////////////////////
const renderShaderModule = device.createShaderModule({
code: `
struct VertexUniforms {
screenDimensions: vec2f,
particleSize: f32
};
struct VSOut {
@builtin(position) clipPosition: vec4f,
@location(0) color: vec4f
};
@group(0) @binding(0) var<uniform> vertexUniforms: VertexUniforms;
@vertex
fn vs(
@location(0) vertexPosition: vec2f,
@location(1) color: vec4f,
@location(2) position: vec3f
) -> VSOut {
var vsOut: VSOut;
vsOut.clipPosition = vec4f(vertexPosition * vertexUniforms.particleSize / vertexUniforms.screenDimensions + position.xy, position.z, 1.0);
vsOut.color = color;
return vsOut;
}
@fragment
fn fs(@location(0) color: vec4f) -> @location(0) vec4f {
return vec4f(color.rgb * color.a, color.a);
}
`
});
/////////////////////////////////
// Create render pipeline
/////////////////////////////////
const renderPipeline = device.createRenderPipeline({
layout: "auto",
vertex: {
module: renderShaderModule,
entryPoint: "vs",
buffers: [
{
arrayStride: 8,
attributes: [{
shaderLocation: 0,
format: "float32x2",
offset: 0
}]
},
{
arrayStride: 4,
stepMode: "instance",
attributes: [{
shaderLocation: 1,
format: "unorm8x4",
offset: 0
}]
},
{
arrayStride: 16,
stepMode: "instance",
attributes: [{
shaderLocation: 2,
format: "float32x4",
offset: 0
}]
}
]
},
fragment: {
module: renderShaderModule,
entryPoint: "fs",
targets: [{
format: presentationFormat,
blend: {
color: {
srcFactor: "one",
dstFactor: "one-minus-src-alpha"
},
alpha: {
srcFactor: "one",
dstFactor: "one-minus-src-alpha"
}
}
}]
},
multisample: {
count: 4
},
primitive: {
topology: "triangle-strip",
stripIndexFormat: "uint32"
}
});
///////////////////////////////////////////////
// Rendering uniform buffer
///////////////////////////////////////////////
const vertexUniformBuffer = device.createBuffer({
size: 16,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(vertexUniformBuffer, 0, new Float32Array([
canvas.width, canvas.height, PARTICLE_SIZE
]));
const vertexUniformBindGroup = device.createBindGroup({
layout: renderPipeline.getBindGroupLayout(0),
entries: [{
binding: 0,
resource: {
buffer: vertexUniformBuffer
}
}]
});
///////////////////////////
// Render pass description
///////////////////////////
let msaaTexture = device.createTexture({
label: 'msaa texture',
size: [canvas.width, canvas.height],
format: presentationFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
const renderPassDescription = {
colorAttachments: [{
view: msaaTexture.createView(),
resolveTarget: context.getCurrentTexture().createView(),
loadOp: "clear",
storeOp: "store",
clearValue: [0, 0, 0, 1]
}],
timestampWrites: timer.gpuPassDescriptor("draw")
};
window.addEventListener("resize", () => {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
msaaTexture.destroy();
msaaTexture = device.createTexture({
label: 'msaa texture',
size: [canvas.width, canvas.height],
format: presentationFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
renderPassDescription.colorAttachments[0].view = msaaTexture.createView()
});
requestAnimationFrame(function draw() {
timer.cpuTimeStart("frame");
/////////////////////////
// Set up command buffer
/////////////////////////
const commandEncoder = device.createCommandEncoder();
///////////////////////
// Encode compute pass
///////////////////////
const computePass = commandEncoder.beginComputePass(computePassDescription);
computePass.setPipeline(computePipeline);
computePass.setBindGroup(0, computeBindGroup);
computePass.dispatchWorkgroups(NUM_WORKGROUPS);
computePass.end();
////////////////////////////////
// Get current canvas texture
////////////////////////////////
renderPassDescription.colorAttachments[0].resolveTarget = context.getCurrentTexture().createView();
///////////////////////
// Encode render pass
///////////////////////
const renderPass = commandEncoder.beginRenderPass(renderPassDescription);
renderPass.setPipeline(renderPipeline);
// First argument here refers to array index
// in renderPipeline vertexState.vertexBuffers
renderPass.setVertexBuffer(0, vertexBuffer);
renderPass.setVertexBuffer(1, colorBuffer);
renderPass.setVertexBuffer(2, positionBuffer);
renderPass.setBindGroup(0, vertexUniformBindGroup);
renderPass.draw(4, NUM_PARTICLES);
renderPass.end();
//////////////////////////
// Submit command buffer
//////////////////////////
timer.gpuBeforeSubmit(commandEncoder);
device.queue.submit([commandEncoder.finish()]);
timer.gpuAfterSubmit();
timer.cpuTimeEnd("frame");
cpuTimeDisplay.innerText = `${timer.cpuTimes["frame"].toFixed(2)}ms`;
computeTimeDisplay.innerText = timer.hasGPUTimer ? `${timer.gpuTimes["compute"].toFixed(2)}ms` : "N/A";
drawTimeDisplay.innerText = timer.hasGPUTimer ? `${timer.gpuTimes["draw"].toFixed(2)}ms` : "N/A";
requestAnimationFrame(draw);
});
})();
</script>
</body>
</html>