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pick.html
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pick.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="css/example.css">
<script src="utils/gl-matrix.js"></script>
</head>
<!--
The MIT License (MIT)
Copyright (c) 2024 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 Pick Time: <span id="pick-time"></span>
</div>
<div>
GPU Draw Time: <span id="draw-time"></span>
</div>
</div>
<script type="module">
import { checkSupport, addDescription, loadImageBitmaps, createCube, xformMatrix, randomRange, getMipLevelCount, generate2DMipmap, parseAdapterInfo } from "./utils/utils.js";
import { Timer } from "./utils/Timer.js";
const { mat4, vec3 } = glMatrix;
checkSupport();
addDescription(
"Picking",
"Interact with rendered objects using color picking.",
"pick.html"
);
(async () => {
//////////////////////////////////////////
// Set up WebGPU adapter, load
// texture image
//////////////////////////////////////////
const [adapter, [image]] = await Promise.all([
navigator.gpu.requestAdapter(),
loadImageBitmaps(["img/webgpu.png"])
]);
const presentationFormat = navigator.gpu.getPreferredCanvasFormat();
////////////////////////////////////
// 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 pickTimeDisplay = document.getElementById("pick-time");
const drawTimeDisplay = document.getElementById("draw-time");
////////////////////////////////////////
// Create vertex buffers and load data
////////////////////////////////////////
const cubeData = createCube();
const numVertices = cubeData.positions.length / 3;
const positionBuffer = device.createBuffer({
size: cubeData.positions.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
});
const normalBuffer = device.createBuffer({
size: cubeData.normals.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
});
const uvBuffer = device.createBuffer({
size: cubeData.uvs.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(positionBuffer, 0, cubeData.positions);
device.queue.writeBuffer(normalBuffer, 0, cubeData.normals);
device.queue.writeBuffer(uvBuffer, 0, cubeData.uvs);
/////////////////////////////////////////
// Create texture, sampler and load data
//////////////////////////////////////////
const sampler = device.createSampler({
minFilter: "linear",
magFilter: "linear",
mipmapFilter: "linear"
});
const texture = device.createTexture({
size: [image.width, image.height],
format: "rgba8unorm",
mipLevelCount: getMipLevelCount(image.width, image.height),
usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.COPY_DST | GPUTextureUsage.RENDER_ATTACHMENT
});
device.queue.copyExternalImageToTexture(
{ source: image, flipY: true },
{ texture },
{
width: image.width,
height: image.height
}
);
generate2DMipmap(device, texture);
///////////////////////
// Uniform values
////////////////////////
let projectionMatrix = mat4.create();
mat4.perspectiveZO(projectionMatrix, Math.PI / 2, canvas.width / canvas.height, 0.5, 6.0);
let viewMatrix = mat4.create();
let eyePosition = vec3.fromValues(0, 0, 1);
mat4.lookAt(viewMatrix, eyePosition, vec3.fromValues(0, 0, 0), vec3.fromValues(0, 1, 0));
let viewProjectionMatrix = mat4.create();
mat4.multiply(viewProjectionMatrix, projectionMatrix, viewMatrix);
let lightPosition = vec3.fromValues(1, 1, 0.5);
let highlightColor = new Float32Array([1.5, 1.5, 0.5, 1.0]);
let unhighlightColor = new Float32Array([1.0, 1.0, 1.0, 1.0]);
/////////////////////
// Picking pipeline
/////////////////////
// Picking render targets
let pickTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: "rgba8unorm",
usage: GPUTextureUsage.COPY_SRC | GPUTextureUsage.RENDER_ATTACHMENT
});
let pickDepthTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: "depth24plus",
usage: GPUTextureUsage.RENDER_ATTACHMENT
});
// Picking buffer to copy render target pixel values to
// for mapped read.
// (Will only store one pixel value.)
const pickBuffer = device.createBuffer({
size: 4,
usage:GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ
});
const pickShaderModule = device.createShaderModule({
label: 'pick shader',
code: `
struct PickUniforms {
mvpMatrix: mat4x4f ,
pickColor: vec4f
};
@group(0) @binding(0) var<uniform> pickUniforms: PickUniforms;
@vertex
fn vs(@location(0) position: vec4f) -> @builtin(position) vec4f {
return pickUniforms.mvpMatrix * position;
}
@fragment
fn fs() -> @location(0) vec4f {
return pickUniforms.pickColor;
}
`
});
const pickPipeline = device.createRenderPipeline({
layout: 'auto',
vertex: {
module: pickShaderModule,
entryPoint: "vs",
buffers: [
{
arrayStride: 12,
attributes: [{
shaderLocation: 0,
format: "float32x3",
offset: 0
}]
}
]
},
fragment: {
module: pickShaderModule,
entryPoint: "fs",
// Renders to pickTexture
targets: [{
format: "rgba8unorm"
}]
},
primitive: {
topology: "triangle-list",
cullMode: "back"
},
depthStencil: {
format: "depth24plus",
depthWriteEnabled: true,
depthCompare: "less"
}
});
///////////////////
// Draw pipeline
///////////////////
// Render targets
let msaaTexture = device.createTexture({
label: 'msaa texture',
size: [canvas.width, canvas.height],
format: presentationFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
let drawDepthTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: "depth24plus",
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
// Scene uniforms that are only set once.
const sceneUniformBuffer = device.createBuffer({
size: 96,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(sceneUniformBuffer, 0, viewProjectionMatrix);
device.queue.writeBuffer(sceneUniformBuffer, 64, eyePosition);
device.queue.writeBuffer(sceneUniformBuffer, 80, lightPosition);
const drawShaderModule = device.createShaderModule({
code: `
struct SceneUniforms {
viewProjectionMatrix: mat4x4f,
eyePosition: vec4f,
lightPosition: vec4f
};
struct ObjectUniforms {
worldMatrix: mat4x4f,
highlightColor: vec4f
};
struct VSOut {
@builtin(position) clipPosition: vec4f,
@location(0) worldPosition: vec3f,
@location(1) normal: vec3f,
@location(2) uv: vec2f,
};
@group(0) @binding(0) var<uniform> sceneUniforms: SceneUniforms;
@group(0) @binding(1) var<uniform> objectUniforms: ObjectUniforms;
@vertex
fn vs(
@location(0) position: vec4f,
@location(1) normal: vec3f,
@location(2) uv: vec2f,
) -> VSOut {
let worldPosition: vec4f = objectUniforms.worldMatrix * position;
var vsOut: VSOut;
vsOut.clipPosition = sceneUniforms.viewProjectionMatrix * worldPosition;
vsOut.worldPosition = worldPosition.xyz;
vsOut.normal = (objectUniforms.worldMatrix * vec4f(normal, 0.0)).xyz;
vsOut.uv = uv;
return vsOut;
}
@group(0) @binding(2) var textureSampler: sampler;
@group(0) @binding(3) var textureData: texture_2d<f32>;
@fragment
fn fs(fsIn: VSOut) -> @location(0) vec4f {
let surfaceColor: vec3f = textureSample(textureData, textureSampler, fsIn.uv).rgb;
let normal: vec3f = normalize(fsIn.normal);
let eyeVec: vec3f = normalize(sceneUniforms.eyePosition.xyz - fsIn.worldPosition);
let incidentVec: vec3f = normalize(fsIn.worldPosition - sceneUniforms.lightPosition.xyz);
let lightVec: vec3f = -incidentVec;
let diffuse: f32 = max(dot(lightVec, normal), 0.0);
let highlight: f32 = pow(max(dot(eyeVec, reflect(incidentVec, normal)), 0.0), 100.0);
let ambient: f32 = 0.1;
return vec4f(objectUniforms.highlightColor.rgb * surfaceColor * (diffuse + highlight + ambient), 1.0);
}
`
});
const drawPipeline = device.createRenderPipeline({
layout: 'auto',
vertex: {
module: drawShaderModule,
entryPoint: "vs",
buffers: [
{
arrayStride: 12,
attributes: [{
shaderLocation: 0,
format: "float32x3",
offset: 0
}]
},
{
arrayStride: 12,
attributes: [{
shaderLocation: 1,
format: "float32x3",
offset: 0
}]
},
{
arrayStride: 8,
attributes: [{
shaderLocation: 2,
format: "float32x2",
offset: 0
}]
}
]
},
fragment: {
module: drawShaderModule,
entryPoint: "fs",
targets: [{
format: presentationFormat
}]
},
multisample: {
count: 4
},
primitive: {
topology: "triangle-list",
cullMode: "back"
},
depthStencil: {
format: "depth24plus",
depthWriteEnabled: true,
depthCompare: "less"
}
});
////////////
// Objects
////////////
const boxes = new Array(300).fill(null).map((_, i) => {
// 0 index reserved for background.
const index = i + 1;
const r = (index & 0xFF) / 255;
const g = ((index >> 8) & 0xFF) / 255;
const b = ((index >> 16) & 0xFF) / 255;
const a = ((index >> 24) & 0xFF) / 255;
const pickUniformBuffer = device.createBuffer({
size: 80,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(pickUniformBuffer, 64, new Float32Array([r, g, b, a]));
const pickBindGroup = device.createBindGroup({
layout: pickPipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: {
buffer: pickUniformBuffer
}
},
]
});
const drawUniformBuffer = device.createBuffer({
size: 80,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(drawUniformBuffer, 64, unhighlightColor);
const drawBindGroup = device.createBindGroup({
layout: drawPipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: {
buffer: sceneUniformBuffer
}
},
{
binding: 1,
resource: {
buffer: drawUniformBuffer
}
},
{
binding: 2,
resource: sampler
},
{
binding: 3,
resource: texture.createView()
}
]
});
return {
translate: [
randomRange(-3, 3),
randomRange(-3, 3),
randomRange(-4, 0)
],
rotate: [
randomRange(0, 2 * Math.PI),
randomRange(0, 2 * Math.PI),
randomRange(0, 2 * Math.PI)
],
scale: [
0.25,
0.25,
0.25
],
mvpMatrix: mat4.create(),
modelMatrix: mat4.create(),
pickUniformBuffer,
pickBindGroup,
drawUniformBuffer,
drawBindGroup
};
});
///////////////////////////
// Render pass description
///////////////////////////
const pickRenderPassDescription = {
colorAttachments: [{
view: pickTexture.createView(),
loadOp: "clear",
storeOp: "store",
clearValue: [0, 0, 0, 0]
}],
depthStencilAttachment: {
view: pickDepthTexture.createView(),
depthClearValue: 1,
depthLoadOp: "clear",
depthStoreOp: "store"
},
timestampWrites: timer.gpuPassDescriptor("pick")
};
const drawRenderPassDescription = {
colorAttachments: [{
view: msaaTexture.createView(),
resolveTarget: context.getCurrentTexture().createView(),
loadOp: "clear",
storeOp: "store",
clearValue: [0, 0, 0, 1]
}],
depthStencilAttachment: {
view: drawDepthTexture.createView(),
depthClearValue: 1,
depthLoadOp: "clear",
depthStoreOp: "store"
},
timestampWrites: timer.gpuPassDescriptor("draw")
};
// MOUSE HANDLER FOR PICKING
let mouseX = -1;
let mouseY = -1;
let lastPickIndex = -1;
canvas.addEventListener("mousemove", function(event) {
mouseX = event.clientX;
mouseY = event.clientY;
});
window.addEventListener("resize", () => {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
mouseX = -1;
mouseY = -1;
mat4.perspectiveZO(projectionMatrix, Math.PI / 2, canvas.width / canvas.height, 0.1, 10.0)
mat4.multiply(viewProjectionMatrix, projectionMatrix, viewMatrix);
device.queue.writeBuffer(sceneUniformBuffer, 0, viewProjectionMatrix);
pickTexture.destroy();
pickTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: "rgba8unorm",
usage: GPUTextureUsage.COPY_SRC | GPUTextureUsage.RENDER_ATTACHMENT
});
pickDepthTexture.destroy();
pickDepthTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: "depth24plus",
usage: GPUTextureUsage.RENDER_ATTACHMENT
});
msaaTexture.destroy();
msaaTexture = device.createTexture({
label: 'msaa texture',
size: [canvas.width, canvas.height],
format: presentationFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
drawDepthTexture.destroy();
drawDepthTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: "depth24plus",
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
pickRenderPassDescription.colorAttachments[0].view = pickTexture.createView()
pickRenderPassDescription.depthStencilAttachment.view = pickDepthTexture.createView()
drawRenderPassDescription.colorAttachments[0].view = msaaTexture.createView()
drawRenderPassDescription.depthStencilAttachment.view = drawDepthTexture.createView()
});
let lastTime;
function draw(time) {
timer.cpuTimeStart("frame");
lastTime = lastTime ?? time;
const dt = time - lastTime;
lastTime = time;
for (const box of boxes) {
box.rotate[0] += 0.001 * dt;
box.rotate[1] += 0.002 * dt;
xformMatrix(box.modelMatrix, box.translate, box.rotate, box.scale);
mat4.multiply(box.mvpMatrix, viewProjectionMatrix, box.modelMatrix);
device.queue.writeBuffer(box.pickUniformBuffer, 0, box.mvpMatrix);
device.queue.writeBuffer(box.drawUniformBuffer, 0, box.modelMatrix);
}
//////////////
// Picking
//////////////
if (mouseX > -1 && pickBuffer.mapState === "unmapped") {
const pickCommandEncoder = device.createCommandEncoder();
const pickPass = pickCommandEncoder.beginRenderPass(pickRenderPassDescription);
// Draw all boxes with pick color (index encoded as r, g, b, a).
pickPass.setPipeline(pickPipeline);
pickPass.setVertexBuffer(0, positionBuffer);
for (const box of boxes) {
pickPass.setBindGroup(0, box.pickBindGroup);
pickPass.draw(numVertices);
}
pickPass.end();
// Copy pixel at mouse position into buffer.
pickCommandEncoder.copyTextureToBuffer(
{
texture: pickTexture,
origin: [mouseX, mouseY]
},
{
buffer: pickBuffer
},
[1, 1]
);
timer.gpuBeforeSubmit(pickCommandEncoder, ["pick"]);
device.queue.submit([pickCommandEncoder.finish()]);
timer.gpuAfterSubmit(["pick"])
// Map buffer
pickBuffer.mapAsync(GPUMapMode.READ).then(() => {
// Read pixel r, g, b, a
const [r, g, b, a] = new Uint8Array(pickBuffer.getMappedRange());
pickBuffer.unmap();
// Decode index.
const index = (r | (g << 8) | (b << 16) | (a << 24)) - 1;
if (index === lastPickIndex) {
return;
}
if (lastPickIndex > -1) {
device.queue.writeBuffer(boxes[lastPickIndex].drawUniformBuffer, 64, unhighlightColor);
}
// If hovering, update highligh color, cursor.
if (index > -1) {
device.queue.writeBuffer(boxes[index].drawUniformBuffer, 64, highlightColor);
document.body.style.cursor = 'pointer';
} else {
document.body.style.cursor = 'auto';
}
lastPickIndex = index;
});
}
///////////
// Draw
///////////
drawRenderPassDescription.colorAttachments[0].resolveTarget = context.getCurrentTexture().createView();
const drawCommandEncoder = device.createCommandEncoder();
const renderPass = drawCommandEncoder.beginRenderPass(drawRenderPassDescription);
renderPass.setPipeline(drawPipeline);
renderPass.setVertexBuffer(0, positionBuffer);
renderPass.setVertexBuffer(1, normalBuffer);
renderPass.setVertexBuffer(2, uvBuffer);
for (const box of boxes) {
renderPass.setBindGroup(0, box.drawBindGroup);
renderPass.draw(numVertices);
}
renderPass.end();
timer.gpuBeforeSubmit(drawCommandEncoder, ["draw"]);
device.queue.submit([drawCommandEncoder.finish()]);
timer.gpuAfterSubmit(["draw"]);
timer.cpuTimeEnd("frame");
cpuTimeDisplay.innerText = `${timer.cpuTimes["frame"].toFixed(2)}ms`;
pickTimeDisplay.innerText = timer.hasGPUTimer ? `${timer.gpuTimes["pick"].toFixed(2)}ms` : "N/A";
drawTimeDisplay.innerText = timer.hasGPUTimer ? `${timer.gpuTimes["draw"].toFixed(2)}ms` : "N/A";
requestAnimationFrame(draw);
}
requestAnimationFrame(draw);
})();
</script>
</body>
</html>