LeelaChessZero · zamfofex · Oct 5, 2024
diff --git a/cross-files/wasm32-emscripten b/cross-files/wasm32-emscripten
@@ -0,0 +1,26 @@
+[host_machine]
+system = 'emscripten'
+cpu_family = 'wasm32'
+cpu = 'wasm32'
+endian = 'little'
+
+[binaries]
+c = 'emcc'
+cpp = 'em++'
+ar = 'emar'
+strip = 'emstrip'
+
+[built-in options]
+cpp_args = ['--use-port=zlib', '-fexceptions', '-msse', '-msse2', '-msse3', '-msimd128']
+cpp_link_args = [
+		'--use-port=zlib',
+		'-fexceptions',
+		'-sASYNCIFY', '-sASYNCIFY_STACK_SIZE=65536',
+		'-STACK_SIZE=1048576',
+		'-sMODULARIZE', '-sEXPORT_ES6',
+		'-sDEFAULT_LIBRARY_FUNCS_TO_INCLUDE=$stringToNewUTF8',
+		'-sALLOW_MEMORY_GROWTH',
+		'-sWASM_BIGINT',
+		'-sENVIRONMENT=worker',
+		'-sEXTRA_EXPORTED_RUNTIME_METHODS=["FS"]',
+	]
diff --git a/js/.gitignore b/js/.gitignore
@@ -0,0 +1,5 @@
+node_modules
+package-lock.json
+dist
+build
+lc0.tar
diff --git a/js/README.md b/js/README.md
@@ -0,0 +1,19 @@
+<!-- TODO: improve documentation! -->
+
+Leela Chess Zero (Wasm)
+===
+
+Lc0 compiled to WebAssembly (running on WebGPU when supported).
+
+compiling
+---
+
+- Install [Emscripten].
+- Install [npm].
+- Install [Meson].
+- Run `npm install`
+- Run `npm run build` (or `./build.sh`)
+
+[Emscripten]: <https://emscripten.org/docs/getting_started/downloads.html>
+[npm]: <https://docs.npmjs.com/cli/configuring-npm/install>
+[Meson]: <https://mesonbuild.com/Getting-meson.html>
diff --git a/js/build.sh b/js/build.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+set -ex
+meson setup --buildtype=release -Ddefault_library=static --prefer-static --cross-file=../cross-files/wasm32-emscripten -Dblas=false build .. || :
+meson compile -C build lc0
+esbuild --minify --outdir=dist --format=esm main.js worker.js build/lc0.js build/lc0.worker.mjs
+mv dist/build/lc0.worker.js dist/build/lc0.worker.mjs
+cp build/lc0.wasm dist/build
+cat > dist/package.json << END
+{
+	"name": "lc0",
+	"description": "Leela Chess Zero",
+	"version": "0.0.0.1",
+	"license": "GPL",
+	"homepage": "https://lczero.org",
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/LeelaChessZero/lc0"
+	},
+	"main": "./main.js",
+	"exports": {
+		".": {
+			"import": "./main.js"
+		}
+	},
+	"dependencies": {
+		"onnxruntime-web": "1.20.1"
+	}
+}
+END
diff --git a/js/example/.gitignore b/js/example/.gitignore
@@ -0,0 +1,5 @@
+node_modules
+package-lock.json
+dist
+net.pb.gz
+.parcel-cache
diff --git a/js/example/README.md b/js/example/README.md
@@ -0,0 +1,16 @@
+<!-- TODO: improve documentation! -->
+
+Lc0 Web Example (Wasm)
+===
+
+First, download an Lc0 network and name the file `net.pb.gz` and place it on this directory. Then, run the following commands:
+
+- Install [Emscripten].
+- Install [npm].
+- Install [Meson].
+- Run `npm install`
+- Run `npm run dev`
+
+[Emscripten]: <https://emscripten.org/docs/getting_started/downloads.html>
+[npm]: <https://docs.npmjs.com/cli/configuring-npm/install>
+[Meson]: <https://mesonbuild.com/Getting-meson.html>
diff --git a/js/example/index.html b/js/example/index.html
@@ -0,0 +1,70 @@
+<!doctype html>
+<meta charset="utf-8">
+
+<!--
+  This file is part of Leela Chess Zero.
+  Copyright (C) 2024 The LCZero Authors
+
+  Leela Chess is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Leela Chess is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Leela Chess.  If not, see <http://www.gnu.org/licenses/>.
+
+  Additional permission under GNU GPL version 3 section 7
+
+  If you modify this Program, or any covered work, by linking or
+  combining it with NVIDIA Corporation's libraries from the NVIDIA CUDA
+  Toolkit and the NVIDIA CUDA Deep Neural Network library (or a
+  modified version of those libraries), containing parts covered by the
+  terms of the respective license agreement, the licensors of this
+  Program grant you additional permission to convey the resulting work.
+-->
+
+<title> Lc0 Web Example </title>
+
+<style> @import "@xterm/xterm/css/xterm.css"; </style>
+
+<script type="module">
+
+import {Lc0} from "lc0"
+import {Terminal} from "@xterm/xterm"
+
+let response = await fetch("net.pb.gz")
+let lc0 = Lc0(response.body)
+
+let terminal = new Terminal()
+terminal.open(document.querySelector("div"))
+
+let show = async out =>
+{
+	for await (let line of out) terminal.writeln(line)
+}
+
+show(lc0)
+show(lc0.stderr)
+
+let line = ""
+terminal.onData(data =>
+{
+	if (data === "\x7F") return
+	if (data === "\r") data = "\r\n"
+	terminal.write(data)
+	if (data === "\r\n") {
+		lc0.post(line)
+		line = ""
+		return
+	}
+	line += data
+})
+
+</script>
+
+<div></div>
diff --git a/js/example/package.json b/js/example/package.json
@@ -0,0 +1,11 @@
+{
+	"scripts": {
+		"pack": "cd .. && npm run pack",
+		"dev": "npm run pack && npm install && vite"
+	},
+	"dependencies": {
+		"@xterm/xterm": "5.5.0",
+		"lc0": "../lc0.tar",
+		"vite": "6.0.4"
+	}
+}
diff --git a/js/example/vite.config.js b/js/example/vite.config.js
@@ -0,0 +1,11 @@
+export default {
+	server: {
+		headers: {
+			"Cross-Origin-Embedder-Policy": "require-corp",
+			"Cross-Origin-Opener-Policy": "same-origin",
+		}
+	},
+	optimizeDeps: {
+		exclude: ["lc0"],
+	},
+}
diff --git a/js/main.js b/js/main.js
@@ -0,0 +1,94 @@
+/*
+  This file is part of Leela Chess Zero.
+  Copyright (C) 2024 The LCZero Authors
+
+  Leela Chess is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Leela Chess is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Leela Chess.  If not, see <http://www.gnu.org/licenses/>.
+
+  Additional permission under GNU GPL version 3 section 7
+
+  If you modify this Program, or any covered work, by linking or
+  combining it with NVIDIA Corporation's libraries from the NVIDIA CUDA
+  Toolkit and the NVIDIA CUDA Deep Neural Network library (or a
+  modified version of those libraries), containing parts covered by the
+  terms of the respective license agreement, the licensors of this
+  Program grant you additional permission to convey the resulting work.
+*/
+
+function Stream(worker, type, finished)
+{
+	let gotLine
+	const lines = []
+
+	worker.addEventListener("message", ({data}) =>
+	{
+		if (data.type !== type) return
+		if (!gotLine) {
+			lines.push(data.text)
+			return
+		}
+		gotLine(data.text)
+		gotLine = undefined
+	})
+
+	function next()
+	{
+		if (lines.length !== 0) return lines.shift()
+		else return new Promise(resolve => gotLine = resolve)
+	}
+
+	const it = {next: async () => finished() && lines.length === 0 ? {done: true} : {done: false, value: await next()}}
+	Object.freeze(it)
+
+	const peek = () => lines[0]
+	return {next, peek, [Symbol.asyncIterator]: () => it}
+}
+
+export function Lc0(network)
+{
+	const worker = new Worker(new URL("worker.js", import.meta.url), {type: "module"})
+
+	let commands = []
+	let post0 = command => commands.push(command)
+
+	worker.addEventListener("message", () =>
+	{
+		worker.postMessage({network}, [network])
+		for (const command of commands) worker.postMessage(command)
+		commands = undefined
+		post0 = command => worker.postMessage(command)
+	}, {once: true})
+
+	const post = command =>
+	{
+		if (finished) throw new Error("Cannot post command to finished Lc0")
+		post0(String(command))
+	}
+
+	let finished = false
+
+	// todo: this should send a message to the worker instead
+	// so that it can end its pthread workers too
+	function finish()
+	{
+		finished = true
+		worker.terminate()
+	}
+
+	const stdout = Stream(worker, "stdout", () => finished)
+	const stderr = Stream(worker, "stderr", () => finished)
+
+	const lc0 = {post, finish, ...stdout, stderr, get finished() { return finished }}
+	Object.freeze(lc0)
+	return lc0
+}
diff --git a/js/package.json b/js/package.json
@@ -0,0 +1,10 @@
+{
+	"scripts": {
+		"build": "npm install && ./build.sh",
+		"pack": "npm run build && tar cf lc0.tar dist"
+	},
+	"dependencies": {
+		"esbuild": "0.24.2"
+	}
+}
+