manual web bundle

README.md

@@ -31,6 +31,18 @@ A complete Example can be found at [stockfish_chess_engine](https://github.com/l
 ## Web support
 Web support is currently experimental and currently requires manuly adding assets. It uses a version of stockfish compiled with [emscripten](https://emscripten.org/).
 
+Usage:
+- Install `emscripten` and the the Environment-Variable `EMSDK`
+- Build the CMakeLists.txt in `web/`
+- Copy the following files to `web/stockfish/` in your project: 
+  - flutter_stockfish_plugin.js
+  - flutter_stockfish_plugin.wasm
+  - flutter_stockfish_plugin.worker.js
+  - js_bindings.js
+  - stockfish_data.bin
+
+If a different path should be used: Change the path const's in `js_bindungs.js` and `stockfish_web_bindings.dart`
+
 In order to make multithreading available, the site must run in a secure environment. 
 The following headers must be set for this:
 
@@ -38,9 +50,8 @@ The following headers must be set for this:
 - `Cross-Origin-Opener-Policy: same-origin`
 
 Problems:
-- The current version includes the `.js`, `.wasm` and neuralnetwork data as assets. 
-These files are bundled with every build on every platform, even if they are not needed. 
-This approach wasts about 41MB, if not striped out by hand.
+- The current version does not include the `.js`, `.wasm` and neuralnetwork data as assets. 
+This files will not be bundles automaticly on the web.
 
 
 ## Goal of this fork of stockfish_chess_engine

lib/stockfish_web_bindings.dart

@@ -7,6 +7,8 @@ import 'dart:html' as html;
 import 'package:flutter/foundation.dart';
 import 'package:flutter_stockfish_plugin/stockfish_bindings.dart';
 
+const jsPath = "stockfish/";
+
 class StockfishChessEngineBindings
     extends StockfishChessEngineAbstractBindings {
   Future<void>? loadJs;
@@ -49,15 +51,13 @@ bool _jsloaded = false;
 Future<void> loadJsFileIfNeeded() async {
   if (kIsWeb && !_jsloaded) {
     final stockfishScript = html.document.createElement("script");
-    stockfishScript.setAttribute("src",
-        "assets/packages/flutter_stockfish_plugin/web/flutter_stockfish_plugin.js");
+    stockfishScript.setAttribute("src", "${jsPath}flutter_stockfish_plugin.js");
     html.document.head?.append(stockfishScript);
 
     await stockfishScript.onLoad.first;
 
     final jsBindingsScript = html.document.createElement("script");
-    jsBindingsScript.setAttribute(
-        "src", "assets/packages/flutter_stockfish_plugin/web/js_bindings.js");
+    jsBindingsScript.setAttribute("src", "${jsPath}js_bindings.js");
     html.document.head?.append(jsBindingsScript);
 
     await jsBindingsScript.onLoad.first;

web/js_bindings.js

@@ -1,4 +1,5 @@
 const nnue_name = "nn-5af11540bbfe.nnue";
+const path = "stockfish/";
 
 let s_read, s_write, s_main, s_init, s_state;
 
@@ -6,7 +7,7 @@ let ready = false;
 let ready_cb = null;
 
 Module.onRuntimeInitialized = async function () {
-    let data = await fetch("assets/packages/flutter_stockfish_plugin/web/stockfish_data.bin");
+    let data = await fetch(path + "stockfish_data.bin");
     let b = new Uint8Array(await data.arrayBuffer());
     FS.createDataFile("/", nnue_name, b, true, false, true);
     s_read = Module.cwrap("stockfish_stdout_read", "char*", ["bool"], { async: false });
@@ -30,7 +31,7 @@ let _listener_state_cb = (_) => { };
 let _last_state = -2;
 function _stockfish_listener() {
     let state = s_state();
-    if(state >= 0 && _last_state != state){
+    if (state >= 0 && _last_state != state) {
         _listener_state_cb(state);
     }
     _last_state = state;