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Support gsplat worker on nodejs #7770

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Merged
merged 2 commits into from
Jun 16, 2025
Merged

Support gsplat worker on nodejs #7770

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slimbuck Jun 14, 2025
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slimbuck Jun 14, 2025
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58 changes: 37 additions & 21 deletions src/scene/gsplat/gsplat-sorter.js
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Original file line number Diff line number Diff line change
@@ -1,8 +1,11 @@
import { EventHandler } from '../../core/event-handler.js';
import { TEXTURELOCK_READ } from '../../platform/graphics/constants.js';
import { platform } from '../../core/platform.js';

// sort blind set of data
function SortWorker() {
const myself = (typeof self !== 'undefined' && self) || (require('node:worker_threads').parentPort);

let order;
let centers;
let chunks;
Expand Down Expand Up @@ -196,26 +199,28 @@ function SortWorker() {
}

// send results
self.postMessage({
myself.postMessage({
order: order.buffer,
count
}, [order.buffer]);

order = null;
};

self.onmessage = (message) => {
if (message.data.order) {
order = new Uint32Array(message.data.order);
myself.addEventListener('message', (message) => {
const msgData = message.data ?? message;

if (msgData.order) {
order = new Uint32Array(msgData.order);
}
if (message.data.centers) {
centers = new Float32Array(message.data.centers);
if (msgData.centers) {
centers = new Float32Array(msgData.centers);
forceUpdate = true;

if (message.data.chunks) {
const chunksSrc = new Float32Array(message.data.chunks);
if (msgData.chunks) {
const chunksSrc = new Float32Array(msgData.chunks);
// reuse chunks memory, but we only need 4 floats per chunk
chunks = new Float32Array(message.data.chunks, 0, chunksSrc.length * 4 / 6);
chunks = new Float32Array(msgData.chunks, 0, chunksSrc.length * 4 / 6);

boundMin.x = chunksSrc[0];
boundMin.y = chunksSrc[1];
Expand Down Expand Up @@ -297,15 +302,15 @@ function SortWorker() {
}
}
}
if (message.data.hasOwnProperty('mapping')) {
mapping = message.data.mapping ? new Uint32Array(message.data.mapping) : null;
if (msgData.hasOwnProperty('mapping')) {
mapping = msgData.mapping ? new Uint32Array(msgData.mapping) : null;
forceUpdate = true;
}
if (message.data.cameraPosition) cameraPosition = message.data.cameraPosition;
if (message.data.cameraDirection) cameraDirection = message.data.cameraDirection;
if (msgData.cameraPosition) cameraPosition = msgData.cameraPosition;
if (msgData.cameraDirection) cameraDirection = msgData.cameraDirection;

update();
};
});
}

class GSplatSorter extends EventHandler {
Expand All @@ -318,12 +323,23 @@ class GSplatSorter extends EventHandler {
constructor() {
super();

this.worker = new Worker(URL.createObjectURL(new Blob([`(${SortWorker.toString()})()`], {
type: 'application/javascript'
})));
const workerSource = `(${SortWorker.toString()})()`;
const nodeEnv = platform.environment === 'node';

this.worker.onmessage = (message) => {
const newOrder = message.data.order;
if (nodeEnv) {
this.worker = new Worker(workerSource, {
eval: true
});
} else {
this.worker = new Worker(URL.createObjectURL(new Blob([workerSource], {
type: 'application/javascript'
})));
}

this.worker[nodeEnv ? 'on' : 'addEventListener']('message', (message) => {
const msgData = message.data ?? message;

const newOrder = msgData.order;
const oldOrder = this.orderTexture._levels[0].buffer;

// send vertex storage to worker to start the next frame
Expand All @@ -336,8 +352,8 @@ class GSplatSorter extends EventHandler {
this.orderTexture.upload();

// set new data directly on texture
this.fire('updated', message.data.count);
};
this.fire('updated', msgData.count);
});
}

destroy() {
Expand Down