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deferred.html
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deferred.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 Lights Draw Time: <span id="lights-time"></span>
</div>
<div>
GPU GBuffer Render Time: <span id="gbuffer-time"></span>
</div>
<div>
GPU Lighting Time: <span id="lighting-time"></span>
</div>
</div>
<script type="module">
import { checkSupport, addDescription, loadImageBitmaps, createCube, createSphere, createQuad, xformMatrix, randomRange, getMipLevelCount, generate2DMipmap, parseAdapterInfo } from "./utils/utils.js";
import { Timer } from "./utils/Timer.js";
const { mat4, vec3 } = glMatrix;
const NUM_BOXES = 512;
const NUM_LIGHTS = 16;
checkSupport();
addDescription(
"Deferred Rendering",
"Rendering mesh data to a multisampled gBuffer then lighting in a separate pass.",
"deferred.html"
);
(async () => {
//////////////////////////////////////////
// Set up WebGPU adapter
//////////////////////////////////////////
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 cpuTimeDisplay = document.getElementById("cpu-time");
const lightsTimeDisplay = document.getElementById("lights-time");
const gBufferTimeDisplay = document.getElementById("gbuffer-time");
const lightingTimeDisplay = document.getElementById("lighting-time");
const timer = new Timer(device, 10);
////////////////////////////////////////
// Create vertex buffers and load data
////////////////////////////////////////
const cubeData = createCube();
const cube = {
positions: device.createBuffer({
size: cubeData.positions.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
}),
normals: device.createBuffer({
size: cubeData.normals.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
}),
uvs: device.createBuffer({
size: cubeData.uvs.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
}),
count: cubeData.positions.length / 3
};
device.queue.writeBuffer(cube.positions, 0, cubeData.positions);
device.queue.writeBuffer(cube.normals, 0, cubeData.normals);
device.queue.writeBuffer(cube.uvs, 0, cubeData.uvs);
const sphereData = createSphere({
latBands: 8,
longBands: 8
});
const sphere = {
positions: device.createBuffer({
size: sphereData.positions.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
}),
indices: device.createBuffer({
size: sphereData.indices.byteLength,
usage: GPUBufferUsage.INDEX | GPUBufferUsage.COPY_DST
}),
count: sphereData.indices.length
};
device.queue.writeBuffer(sphere.positions, 0, sphereData.positions);
device.queue.writeBuffer(sphere.indices, 0, sphereData.indices);
const quadData = createQuad();
const quad = {
positions: device.createBuffer({
size: quadData.positions.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST
}),
count: quadData.positions.length / 2
};
device.queue.writeBuffer(quad.positions, 0, quadData.positions);
/////////////////////////////////////////
// Create texture, sampler and load data
//////////////////////////////////////////
const sampler = device.createSampler({
minFilter: "linear",
magFilter: "linear",
mipmapFilter: "linear"
});
const colorTexture = 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: colorTexture },
{
width: image.width,
height: image.height
}
);
generate2DMipmap(device, colorTexture);
///////////////////////
// Uniform values
////////////////////////
const projectionMatrix = mat4.create();
mat4.perspectiveZO(projectionMatrix, Math.PI / 2, canvas.width / canvas.height, 0.1, 10.0);
const viewMatrix = mat4.create();
const eyePosition = vec3.fromValues(0, 0, 1);
mat4.lookAt(viewMatrix, eyePosition, vec3.fromValues(0, 0, 0), vec3.fromValues(0, 1, 0));
const viewProjectionMatrix = mat4.create();
mat4.multiply(viewProjectionMatrix, projectionMatrix, viewMatrix);
// Uniform buffer for view projection matrix
// used in lights and gBuffer passes
const viewProjectionMatrixBuffer = device.createBuffer({
size: 64,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(viewProjectionMatrixBuffer, 0, viewProjectionMatrix);
///////////////////////////////
// Lights pass
// (Render lights as spheres)
///////////////////////////////
// Shader module
const lightsShaderModule = device.createShaderModule({
label: 'lights shader',
code: `
struct VSOut {
@builtin(position) clipPosition: vec4f,
@location(0) color: vec3f
};
@group(0) @binding(0) var<uniform> viewProjectionMatrix: mat4x4f;
@vertex
fn vs(
@location(0) vertexPosition: vec3f,
@location(1) position: vec3f,
@location(2) color: vec3f,
) -> VSOut {
let worldPosition: vec4f = vec4f(vertexPosition * 0.02 + position, 1.0);
var vsOut: VSOut;
vsOut.clipPosition = viewProjectionMatrix * worldPosition;
vsOut.color = color.rgb;
return vsOut;
}
@fragment
fn fs(fsIn: VSOut) -> @location(0) vec4f {
let maxChannel: f32 = max(fsIn.color.r, max(fsIn.color.g, fsIn.color.b));
return vec4f(fsIn.color * (1.0 / maxChannel), 1.0);
}
`
});
// Pipeline
const lightsPipeline = device.createRenderPipeline({
label: 'lights pipeline',
layout: 'auto',
vertex: {
module: lightsShaderModule,
entryPoint: "vs",
buffers: [
{
arrayStride: 12,
attributes: [{
shaderLocation: 0,
format: "float32x3",
offset: 0
}]
},
{
arrayStride: 16,
stepMode: "instance",
attributes: [{
shaderLocation: 1,
format: "float32x3",
offset: 0
}]
},
{
arrayStride: 16,
stepMode: "instance",
attributes: [{
shaderLocation: 2,
format: "float32x3",
offset: 0
}]
}
]
},
fragment: {
module: lightsShaderModule,
entryPoint: "fs",
targets: [
{
format: presentationFormat
}
]
},
multisample: {
count: 4
},
primitive: {
topology: "triangle-list",
cullMode: "back"
},
depthStencil: {
format: "depth24plus",
depthWriteEnabled: true,
depthCompare: "less"
}
});
// Objects
// Buffers used as vertex data in the lights pass,
// uniform data in the lighting pass.
const lights = {
data: new Array(NUM_LIGHTS).fill(null).map(() => ({
position: [
randomRange(-2, 2),
randomRange(-2, 2),
randomRange(-0.5, 0.5)
],
color: [
randomRange(0, 1),
randomRange(0, 1),
randomRange(0, 1)
],
offset: [
randomRange(-0.5, 0.5),
randomRange(-0.5, 0.5),
randomRange(-0.5, 0.5)
],
t: randomRange(0, 2 * Math.PI),
})),
positionData: new Float32Array(NUM_LIGHTS * 4),
positions: device.createBuffer({
size: NUM_LIGHTS * 4 * Float32Array.BYTES_PER_ELEMENT,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
}),
colorData: new Float32Array(NUM_LIGHTS * 4),
colors: device.createBuffer({
size: NUM_LIGHTS * 4 * Float32Array.BYTES_PER_ELEMENT,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
}),
bindGroup: device.createBindGroup({
layout: lightsPipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: {
buffer: viewProjectionMatrixBuffer
}
}
]
})
};
lights.data.forEach((data, i) => {
const index = i * 4;
lights.positionData.set(data.position, index);
lights.colorData.set(data.color, index);
});
device.queue.writeBuffer(lights.positions, 0, lights.positionData);
device.queue.writeBuffer(lights.colors, 0, lights.colorData);
////////////////////////////
// GBuffer pass
// (Draw boxes to gBuffer)
////////////////////////////
// Render targets
let gBufferPositionsTexture = device.createTexture({
label: "gBuffer positions texture",
size: [canvas.width, canvas.height],
format: "rgba16float",
usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
let gBufferNormalsTexture = device.createTexture({
label: "gBuffer normals texture",
size: [canvas.width, canvas.height],
format: "rgba16float",
usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
let gBufferColorsTexture = device.createTexture({
label: "gBuffer colors texture",
size: [canvas.width, canvas.height],
format: "rgba8unorm",
usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
// Shader module
const gBufferShaderModule = device.createShaderModule({
label: 'gbuffer shader',
code: `
struct VSOut {
@builtin(position) clipPosition: vec4f,
@location(0) worldPosition: vec3f,
@location(1) normal: vec3f,
@location(2) uv: vec2f,
};
@group(0) @binding(0) var<uniform> viewProjectionMatrix: mat4x4f;
@group(0) @binding(1) var<uniform> worldMatrix: mat4x4f;
@vertex
fn vs(
@location(0) position: vec4f,
@location(1) normal: vec3f,
@location(2) uv: vec2f,
) -> VSOut {
let worldPosition: vec4f = worldMatrix * position;
var vsOut: VSOut;
vsOut.clipPosition = viewProjectionMatrix * worldPosition;
vsOut.worldPosition = worldPosition.xyz;
vsOut.normal = (worldMatrix * vec4f(normal, 0.0)).xyz;
vsOut.uv = uv;
return vsOut;
}
struct FSOut {
@location(0) position: vec4f,
@location(1) normal: vec4f,
@location(2) color: vec4f,
}
@group(0) @binding(2) var textureSampler: sampler;
@group(0) @binding(3) var colorTexture: texture_2d<f32>;
@fragment
fn fs(fsIn: VSOut) -> FSOut {
var fsOut: FSOut;
fsOut.position = vec4f(fsIn.worldPosition, 1.0);
fsOut.normal = vec4f(fsIn.normal, 0.0);
fsOut.color = textureSample(colorTexture, textureSampler, fsIn.uv);
return fsOut;
}
`
});
// Pipeline
const gBufferPipeline = device.createRenderPipeline({
label: 'gbuffer pipeline',
layout: 'auto',
vertex: {
module: gBufferShaderModule,
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: gBufferShaderModule,
entryPoint: "fs",
targets: [
{
format: "rgba16float"
},
{
format: "rgba16float"
},
{
format: "rgba8unorm"
}
]
},
multisample: {
count: 4
},
primitive: {
topology: "triangle-list",
cullMode: "back"
},
depthStencil: {
format: "depth24plus",
depthWriteEnabled: true,
depthCompare: "less"
}
});
// Objects
const boxes = new Array(NUM_BOXES).fill(null).map(() => {
const translate = [
randomRange(-3, 3),
randomRange(-3, 3),
randomRange(-3, 0)
];
const rotate = [
randomRange(0, 2 * Math.PI),
randomRange(0, 2 * Math.PI),
randomRange(0, 2 * Math.PI)
];
const scale = [
0.25,
0.25,
0.25
];
const uniformBuffer = device.createBuffer({
size: 64,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
});
const bindGroup = device.createBindGroup({
layout: gBufferPipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: {
buffer: viewProjectionMatrixBuffer
}
},
{
binding: 1,
resource: {
buffer: uniformBuffer
}
},
{
binding: 2,
resource: sampler
},
{
binding: 3,
resource: colorTexture.createView()
}
]
});
return {
translate,
rotate,
scale,
modelMatrix: mat4.create(),
uniformBuffer,
bindGroup
};
});
/////////////////////////////////////////
// Lighting pass
// (Render a full-screen quad and apply
// lighting to data in gBuffer)
/////////////////////////////////////////
// Uniforms
const lightingEyePositionBuffer = device.createBuffer({
size: 16,
usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST
});
device.queue.writeBuffer(lightingEyePositionBuffer, 0, eyePosition);
// Shader module
const lightingShaderModule = device.createShaderModule({
code: `
@vertex
fn vs(@location(0) position: vec4f) -> @builtin(position) vec4f {
return position;
}
const lightDampening = 0.3;
@group(0) @binding(0) var<uniform> eyePosition: vec4f;
@group(0) @binding(1) var<uniform> lightPositions: array<vec4f, ${NUM_LIGHTS}>;
@group(0) @binding(2) var<uniform> lightColors: array<vec4f, ${NUM_LIGHTS}>;
@group(0) @binding(3) var positionTexture: texture_multisampled_2d<f32>;
@group(0) @binding(4) var normalTexture: texture_multisampled_2d<f32>;
@group(0) @binding(5) var colorTexture: texture_multisampled_2d<f32>;
@fragment
fn fs(
@builtin(position) fragmentPosition: vec4f,
@builtin(sample_index) sampleIndex: u32
) -> @location(0) vec4f {
let canvasPosition = vec2u(fragmentPosition.xy);
let positionSample = textureLoad(positionTexture, canvasPosition, sampleIndex);
if (positionSample.w == 0.0) {
discard;
}
let position = positionSample.xyz;
let normal = normalize(textureLoad(normalTexture, canvasPosition, sampleIndex).xyz);
let surfaceColor = textureLoad(colorTexture, canvasPosition, sampleIndex).rgb;
let eyeDirection: vec3f = normalize(eyePosition.xyz - position);
var color = vec3f(0.05);
for (var i = 0; i < ${NUM_LIGHTS}; i++) {
let lightPosition = lightPositions[i].xyz;
let lightColor = lightColors[i].rgb * lightDampening;
let lightVec: vec3f = lightPosition - position;
let lightDirection = normalize(lightVec);
let reflectionDirection = reflect(-lightDirection, normal);
let nDotL: f32 = max(dot(lightDirection, normal), 0.0);
let diffuse: vec3f = nDotL * lightColor;
let specular: vec3f = pow(max(dot(reflectionDirection, eyeDirection), 0.0), 20.0) * lightColor;
let lightDistance: f32 = length(lightVec);
let attenuation: f32 = 1.0 / (lightDistance * lightDistance);
color += attenuation * surfaceColor * (diffuse + specular);
}
return vec4f(color, 1.0);
}
`
});
// Pipeline
const lightingPipeline = device.createRenderPipeline({
label: 'lighting pipeline',
layout: 'auto',
vertex: {
module: lightingShaderModule,
entryPoint: "vs",
buffers: [
{
arrayStride: 8,
attributes: [{
shaderLocation: 0,
format: "float32x2",
offset: 0
}]
},
]
},
fragment: {
module: lightingShaderModule,
entryPoint: "fs",
targets: [{
format: presentationFormat,
}],
},
multisample: {
count: 4
},
primitive: {
topology: "triangle-strip",
cullMode: "back"
}
});
// Bind group
let lightingBindGroup = device.createBindGroup({
layout: lightingPipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: {
buffer: lightingEyePositionBuffer
}
},
{
binding: 1,
resource: {
buffer: lights.positions
}
},
{
binding: 2,
resource: {
buffer: lights.colors
}
},
{
binding: 3,
resource: gBufferPositionsTexture.createView()
},
{
binding: 4,
resource: gBufferNormalsTexture.createView()
},
{
binding: 5,
resource: gBufferColorsTexture.createView()
}
]
});
//////////////////////////////
// Render pass descriptions
//////////////////////////////
let msaaTexture = device.createTexture({
label: 'msaa texture',
size: [canvas.width, canvas.height],
format: presentationFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
let depthTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: "depth24plus",
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
const lightsRenderPassDescription = {
label: 'lights render pass',
colorAttachments: [
{
view: msaaTexture.createView(),
resolveTarget: context.getCurrentTexture().createView(),
loadOp: "clear",
storeOp: "store",
clearValue: [0, 0, 0, 1]
}
],
depthStencilAttachment: {
view: depthTexture.createView(),
depthClearValue: 1,
depthLoadOp: "clear",
depthStoreOp: "store"
},
timestampWrites: timer.gpuPassDescriptor("lights")
};
const gBufferRenderPassDescription = {
label: 'gbuffer render pass',
colorAttachments: [
{
view: gBufferPositionsTexture.createView(),
loadOp: "clear",
storeOp: "store",
clearValue: [0, 0, 0, 0]
},
{
view: gBufferNormalsTexture.createView(),
loadOp: "clear",
storeOp: "store",
clearValue: [0, 0, 0, 0]
},
{
view: gBufferColorsTexture.createView(),
loadOp: "clear",
storeOp: "store",
clearValue: [0, 0, 0, 0]
}
],
depthStencilAttachment: {
view: depthTexture.createView(),
depthLoadOp: "load",
depthStoreOp: "store"
},
timestampWrites: timer.gpuPassDescriptor("gbuffer")
};
const lightingRenderPassDescription = {
label: 'lighting render pass',
colorAttachments: [{
view: msaaTexture.createView(),
resolveTarget: context.getCurrentTexture().createView(),
loadOp: "load",
storeOp: "store",
}],
timestampWrites: timer.gpuPassDescriptor("lighting")
};
window.addEventListener("resize", () => {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
mat4.perspectiveZO(projectionMatrix, Math.PI / 2, canvas.width / canvas.height, 0.1, 10.0)
mat4.multiply(viewProjectionMatrix, projectionMatrix, viewMatrix);
device.queue.writeBuffer(viewProjectionMatrixBuffer, 0, viewProjectionMatrix);
gBufferPositionsTexture.destroy();
gBufferPositionsTexture = device.createTexture({
label: "gBuffer positions texture",
size: [canvas.width, canvas.height],
format: "rgba16float",
usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
gBufferNormalsTexture.destroy();
gBufferNormalsTexture = device.createTexture({
label: "gBuffer normals texture",
size: [canvas.width, canvas.height],
format: "rgba16float",
usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
gBufferColorsTexture.destroy();
gBufferColorsTexture = device.createTexture({
label: "gBuffer colors texture",
size: [canvas.width, canvas.height],
format: "rgba8unorm",
usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
msaaTexture.destroy();
msaaTexture = device.createTexture({
label: 'msaa texture',
size: [canvas.width, canvas.height],
format: presentationFormat,
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
depthTexture.destroy();
depthTexture = device.createTexture({
size: [canvas.width, canvas.height],
format: "depth24plus",
usage: GPUTextureUsage.RENDER_ATTACHMENT,
sampleCount: 4
});
lightingBindGroup = device.createBindGroup({
layout: lightingPipeline.getBindGroupLayout(0),
entries: [
{
binding: 0,
resource: {
buffer: lightingEyePositionBuffer
}
},
{
binding: 1,
resource: {
buffer: lights.positions
}
},
{
binding: 2,
resource: {
buffer: lights.colors
}
},
{
binding: 3,
resource: gBufferPositionsTexture.createView()
},
{
binding: 4,
resource: gBufferNormalsTexture.createView()
},
{
binding: 5,
resource: gBufferColorsTexture.createView()
}
]
});
lightsRenderPassDescription.colorAttachments[0].view = msaaTexture.createView();
lightsRenderPassDescription.depthStencilAttachment.view = depthTexture.createView();
gBufferRenderPassDescription.colorAttachments[0].view = gBufferPositionsTexture.createView();
gBufferRenderPassDescription.colorAttachments[1].view = gBufferNormalsTexture.createView();
gBufferRenderPassDescription.colorAttachments[2].view = gBufferColorsTexture.createView();
gBufferRenderPassDescription.depthStencilAttachment.view = depthTexture.createView();
lightingRenderPassDescription.colorAttachments[0].view = msaaTexture.createView();
});
let lastTime;
function draw(time) {
timer.cpuTimeStart("frame");
lastTime = lastTime ?? time;
const dt = time - lastTime;
lastTime = time;
///////////////////////////
// Update box positions
///////////////////////////
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);
device.queue.writeBuffer(box.uniformBuffer, 0, box.modelMatrix);
}
///////////////////////////
// Update light positions
///////////////////////////
lights.data.forEach((light, i) => {
light.t = (light.t + 0.0006 * dt) % (2 * Math.PI);
const position = lights.positionData.subarray(i * 4, i * 4 + 3);
vec3.scale(position, light.offset, Math.sin(light.t));
vec3.add(position, light.position, position);
});
device.queue.writeBuffer(lights.positions, 0, lights.positionData);
/////////////////////////////////////
// Create command encoder
/////////////////////////////////////
const commandEncoder = device.createCommandEncoder();
/////////////////////////////////////
// Draw lights as spheres to canvas
/////////////////////////////////////
lightsRenderPassDescription.colorAttachments[0].resolveTarget = context.getCurrentTexture().createView();
const lightsRenderPass = commandEncoder.beginRenderPass(lightsRenderPassDescription);
lightsRenderPass.setPipeline(lightsPipeline);
lightsRenderPass.setVertexBuffer(0, sphere.positions);
lightsRenderPass.setVertexBuffer(1, lights.positions);
lightsRenderPass.setVertexBuffer(2, lights.colors);
lightsRenderPass.setIndexBuffer(sphere.indices, "uint32");
lightsRenderPass.setBindGroup(0, lights.bindGroup);
lightsRenderPass.drawIndexed(sphere.count, NUM_LIGHTS);
lightsRenderPass.end();
//////////////////////////////////////////////
// Draw boxes to GBuffer
// (Depth buffer shared with previous pass)
//////////////////////////////////////////////
const gBufferPass = commandEncoder.beginRenderPass(gBufferRenderPassDescription);
gBufferPass.setPipeline(gBufferPipeline);
gBufferPass.setVertexBuffer(0, cube.positions);
gBufferPass.setVertexBuffer(1, cube.normals);
gBufferPass.setVertexBuffer(2, cube.uvs);
for (const box of boxes) {
gBufferPass.setBindGroup(0, box.bindGroup);
gBufferPass.draw(cube.count);
}
gBufferPass.end();
//////////////////////////////////
// Draw a full-screen quad and
// apply lighting to data in
// GBuffer.
//////////////////////////////////
lightingRenderPassDescription.colorAttachments[0].resolveTarget = context.getCurrentTexture().createView();
const lightingRenderPass = commandEncoder.beginRenderPass(lightingRenderPassDescription);
lightingRenderPass.setPipeline(lightingPipeline);
lightingRenderPass.setVertexBuffer(0, quad.positions);
lightingRenderPass.setBindGroup(0, lightingBindGroup);
lightingRenderPass.draw(quad.count);
lightingRenderPass.end();
/////////////////////////////////////
// Close command encoder and submit
/////////////////////////////////////
timer.gpuBeforeSubmit(commandEncoder);
device.queue.submit([commandEncoder.finish()]);