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-rw-r--r--platform/javascript/js/engine/engine.externs.js3
-rw-r--r--platform/javascript/js/engine/engine.js285
-rw-r--r--platform/javascript/js/engine/preloader.js127
-rw-r--r--platform/javascript/js/engine/utils.js56
4 files changed, 471 insertions, 0 deletions
diff --git a/platform/javascript/js/engine/engine.externs.js b/platform/javascript/js/engine/engine.externs.js
new file mode 100644
index 0000000000..1a94dd15ec
--- /dev/null
+++ b/platform/javascript/js/engine/engine.externs.js
@@ -0,0 +1,3 @@
+var Godot;
+var WebAssembly = {};
+WebAssembly.instantiate = function(buffer, imports) {};
diff --git a/platform/javascript/js/engine/engine.js b/platform/javascript/js/engine/engine.js
new file mode 100644
index 0000000000..74153b672a
--- /dev/null
+++ b/platform/javascript/js/engine/engine.js
@@ -0,0 +1,285 @@
+const Engine = (function () {
+ const preloader = new Preloader();
+
+ let wasmExt = '.wasm';
+ let unloadAfterInit = true;
+ let loadPath = '';
+ let loadPromise = null;
+ let initPromise = null;
+ let stderr = null;
+ let stdout = null;
+ let progressFunc = null;
+
+ function load(basePath) {
+ if (loadPromise == null) {
+ loadPath = basePath;
+ loadPromise = preloader.loadPromise(basePath + wasmExt);
+ preloader.setProgressFunc(progressFunc);
+ requestAnimationFrame(preloader.animateProgress);
+ }
+ return loadPromise;
+ }
+
+ function unload() {
+ loadPromise = null;
+ }
+
+ /** @constructor */
+ function Engine() { // eslint-disable-line no-shadow
+ this.canvas = null;
+ this.executableName = '';
+ this.rtenv = null;
+ this.customLocale = null;
+ this.resizeCanvasOnStart = false;
+ this.onExecute = null;
+ this.onExit = null;
+ this.persistentPaths = ['/userfs'];
+ }
+
+ Engine.prototype.init = /** @param {string=} basePath */ function (basePath) {
+ if (initPromise) {
+ return initPromise;
+ }
+ if (loadPromise == null) {
+ if (!basePath) {
+ initPromise = Promise.reject(new Error('A base path must be provided when calling `init` and the engine is not loaded.'));
+ return initPromise;
+ }
+ load(basePath);
+ }
+ let config = {};
+ if (typeof stdout === 'function') {
+ config.print = stdout;
+ }
+ if (typeof stderr === 'function') {
+ config.printErr = stderr;
+ }
+ const me = this;
+ initPromise = new Promise(function (resolve, reject) {
+ config['locateFile'] = Utils.createLocateRewrite(loadPath);
+ config['instantiateWasm'] = Utils.createInstantiatePromise(loadPromise);
+ Godot(config).then(function (module) {
+ module['initFS'](me.persistentPaths).then(function (fs_err) {
+ me.rtenv = module;
+ if (unloadAfterInit) {
+ unload();
+ }
+ resolve();
+ config = null;
+ });
+ });
+ });
+ return initPromise;
+ };
+
+ /** @type {function(string, string):Object} */
+ Engine.prototype.preloadFile = function (file, path) {
+ return preloader.preload(file, path);
+ };
+
+ /** @type {function(...string):Object} */
+ Engine.prototype.start = function () {
+ // Start from arguments.
+ const args = [];
+ for (let i = 0; i < arguments.length; i++) {
+ args.push(arguments[i]);
+ }
+ const me = this;
+ return me.init().then(function () {
+ if (!me.rtenv) {
+ return Promise.reject(new Error('The engine must be initialized before it can be started'));
+ }
+
+ if (!(me.canvas instanceof HTMLCanvasElement)) {
+ me.canvas = Utils.findCanvas();
+ if (!me.canvas) {
+ return Promise.reject(new Error('No canvas found in page'));
+ }
+ }
+
+ // Canvas can grab focus on click, or key events won't work.
+ if (me.canvas.tabIndex < 0) {
+ me.canvas.tabIndex = 0;
+ }
+
+ // Disable right-click context menu.
+ me.canvas.addEventListener('contextmenu', function (ev) {
+ ev.preventDefault();
+ }, false);
+
+ // Until context restoration is implemented warn the user of context loss.
+ me.canvas.addEventListener('webglcontextlost', function (ev) {
+ alert('WebGL context lost, please reload the page'); // eslint-disable-line no-alert
+ ev.preventDefault();
+ }, false);
+
+ // Browser locale, or custom one if defined.
+ let locale = me.customLocale;
+ if (!locale) {
+ locale = navigator.languages ? navigator.languages[0] : navigator.language;
+ locale = locale.split('.')[0];
+ }
+ // Emscripten configuration.
+ me.rtenv['thisProgram'] = me.executableName;
+ me.rtenv['noExitRuntime'] = true;
+ // Godot configuration.
+ me.rtenv['initConfig']({
+ 'resizeCanvasOnStart': me.resizeCanvasOnStart,
+ 'canvas': me.canvas,
+ 'locale': locale,
+ 'onExecute': function (p_args) {
+ if (me.onExecute) {
+ me.onExecute(p_args);
+ return 0;
+ }
+ return 1;
+ },
+ 'onExit': function (p_code) {
+ me.rtenv['deinitFS']();
+ if (me.onExit) {
+ me.onExit(p_code);
+ }
+ me.rtenv = null;
+ },
+ });
+
+ return new Promise(function (resolve, reject) {
+ preloader.preloadedFiles.forEach(function (file) {
+ me.rtenv['copyToFS'](file.path, file.buffer);
+ });
+ preloader.preloadedFiles.length = 0; // Clear memory
+ me.rtenv['callMain'](args);
+ initPromise = null;
+ resolve();
+ });
+ });
+ };
+
+ Engine.prototype.startGame = function (execName, mainPack, extraArgs) {
+ // Start and init with execName as loadPath if not inited.
+ this.executableName = execName;
+ const me = this;
+ return Promise.all([
+ this.init(execName),
+ this.preloadFile(mainPack, mainPack),
+ ]).then(function () {
+ let args = ['--main-pack', mainPack];
+ if (extraArgs) {
+ args = args.concat(extraArgs);
+ }
+ return me.start.apply(me, args);
+ });
+ };
+
+ Engine.prototype.setWebAssemblyFilenameExtension = function (override) {
+ if (String(override).length === 0) {
+ throw new Error('Invalid WebAssembly filename extension override');
+ }
+ wasmExt = String(override);
+ };
+
+ Engine.prototype.setUnloadAfterInit = function (enabled) {
+ unloadAfterInit = enabled;
+ };
+
+ Engine.prototype.setCanvas = function (canvasElem) {
+ this.canvas = canvasElem;
+ };
+
+ Engine.prototype.setCanvasResizedOnStart = function (enabled) {
+ this.resizeCanvasOnStart = enabled;
+ };
+
+ Engine.prototype.setLocale = function (locale) {
+ this.customLocale = locale;
+ };
+
+ Engine.prototype.setExecutableName = function (newName) {
+ this.executableName = newName;
+ };
+
+ Engine.prototype.setProgressFunc = function (func) {
+ progressFunc = func;
+ };
+
+ Engine.prototype.setStdoutFunc = function (func) {
+ const print = function (text) {
+ let msg = text;
+ if (arguments.length > 1) {
+ msg = Array.prototype.slice.call(arguments).join(' ');
+ }
+ func(msg);
+ };
+ if (this.rtenv) {
+ this.rtenv.print = print;
+ }
+ stdout = print;
+ };
+
+ Engine.prototype.setStderrFunc = function (func) {
+ const printErr = function (text) {
+ let msg = text;
+ if (arguments.length > 1) {
+ msg = Array.prototype.slice.call(arguments).join(' ');
+ }
+ func(msg);
+ };
+ if (this.rtenv) {
+ this.rtenv.printErr = printErr;
+ }
+ stderr = printErr;
+ };
+
+ Engine.prototype.setOnExecute = function (onExecute) {
+ this.onExecute = onExecute;
+ };
+
+ Engine.prototype.setOnExit = function (onExit) {
+ this.onExit = onExit;
+ };
+
+ Engine.prototype.copyToFS = function (path, buffer) {
+ if (this.rtenv == null) {
+ throw new Error('Engine must be inited before copying files');
+ }
+ this.rtenv['copyToFS'](path, buffer);
+ };
+
+ Engine.prototype.setPersistentPaths = function (persistentPaths) {
+ this.persistentPaths = persistentPaths;
+ };
+
+ Engine.prototype.requestQuit = function () {
+ if (this.rtenv) {
+ this.rtenv['request_quit']();
+ }
+ };
+
+ // Closure compiler exported engine methods.
+ /** @export */
+ Engine['isWebGLAvailable'] = Utils.isWebGLAvailable;
+ Engine['load'] = load;
+ Engine['unload'] = unload;
+ Engine.prototype['init'] = Engine.prototype.init;
+ Engine.prototype['preloadFile'] = Engine.prototype.preloadFile;
+ Engine.prototype['start'] = Engine.prototype.start;
+ Engine.prototype['startGame'] = Engine.prototype.startGame;
+ Engine.prototype['setWebAssemblyFilenameExtension'] = Engine.prototype.setWebAssemblyFilenameExtension;
+ Engine.prototype['setUnloadAfterInit'] = Engine.prototype.setUnloadAfterInit;
+ Engine.prototype['setCanvas'] = Engine.prototype.setCanvas;
+ Engine.prototype['setCanvasResizedOnStart'] = Engine.prototype.setCanvasResizedOnStart;
+ Engine.prototype['setLocale'] = Engine.prototype.setLocale;
+ Engine.prototype['setExecutableName'] = Engine.prototype.setExecutableName;
+ Engine.prototype['setProgressFunc'] = Engine.prototype.setProgressFunc;
+ Engine.prototype['setStdoutFunc'] = Engine.prototype.setStdoutFunc;
+ Engine.prototype['setStderrFunc'] = Engine.prototype.setStderrFunc;
+ Engine.prototype['setOnExecute'] = Engine.prototype.setOnExecute;
+ Engine.prototype['setOnExit'] = Engine.prototype.setOnExit;
+ Engine.prototype['copyToFS'] = Engine.prototype.copyToFS;
+ Engine.prototype['setPersistentPaths'] = Engine.prototype.setPersistentPaths;
+ Engine.prototype['requestQuit'] = Engine.prototype.requestQuit;
+ return Engine;
+}());
+if (typeof window !== 'undefined') {
+ window['Engine'] = Engine;
+}
diff --git a/platform/javascript/js/engine/preloader.js b/platform/javascript/js/engine/preloader.js
new file mode 100644
index 0000000000..ec34fb93f2
--- /dev/null
+++ b/platform/javascript/js/engine/preloader.js
@@ -0,0 +1,127 @@
+const Preloader = /** @constructor */ function () { // eslint-disable-line no-unused-vars
+ const loadXHR = function (resolve, reject, file, tracker, attempts) {
+ const xhr = new XMLHttpRequest();
+ tracker[file] = {
+ total: 0,
+ loaded: 0,
+ final: false,
+ };
+ xhr.onerror = function () {
+ if (attempts <= 1) {
+ reject(new Error(`Failed loading file '${file}'`));
+ } else {
+ setTimeout(function () {
+ loadXHR(resolve, reject, file, tracker, attempts - 1);
+ }, 1000);
+ }
+ };
+ xhr.onabort = function () {
+ tracker[file].final = true;
+ reject(new Error(`Loading file '${file}' was aborted.`));
+ };
+ xhr.onloadstart = function (ev) {
+ tracker[file].total = ev.total;
+ tracker[file].loaded = ev.loaded;
+ };
+ xhr.onprogress = function (ev) {
+ tracker[file].loaded = ev.loaded;
+ tracker[file].total = ev.total;
+ };
+ xhr.onload = function () {
+ if (xhr.status >= 400) {
+ if (xhr.status < 500 || attempts <= 1) {
+ reject(new Error(`Failed loading file '${file}': ${xhr.statusText}`));
+ xhr.abort();
+ } else {
+ setTimeout(function () {
+ loadXHR(resolve, reject, file, tracker, attempts - 1);
+ }, 1000);
+ }
+ } else {
+ tracker[file].final = true;
+ resolve(xhr);
+ }
+ };
+ // Make request.
+ xhr.open('GET', file);
+ if (!file.endsWith('.js')) {
+ xhr.responseType = 'arraybuffer';
+ }
+ xhr.send();
+ };
+
+ const DOWNLOAD_ATTEMPTS_MAX = 4;
+ const loadingFiles = {};
+ const lastProgress = { loaded: 0, total: 0 };
+ let progressFunc = null;
+
+ const animateProgress = function () {
+ let loaded = 0;
+ let total = 0;
+ let totalIsValid = true;
+ let progressIsFinal = true;
+
+ Object.keys(loadingFiles).forEach(function (file) {
+ const stat = loadingFiles[file];
+ if (!stat.final) {
+ progressIsFinal = false;
+ }
+ if (!totalIsValid || stat.total === 0) {
+ totalIsValid = false;
+ total = 0;
+ } else {
+ total += stat.total;
+ }
+ loaded += stat.loaded;
+ });
+ if (loaded !== lastProgress.loaded || total !== lastProgress.total) {
+ lastProgress.loaded = loaded;
+ lastProgress.total = total;
+ if (typeof progressFunc === 'function') {
+ progressFunc(loaded, total);
+ }
+ }
+ if (!progressIsFinal) {
+ requestAnimationFrame(animateProgress);
+ }
+ };
+
+ this.animateProgress = animateProgress;
+
+ this.setProgressFunc = function (callback) {
+ progressFunc = callback;
+ };
+
+ this.loadPromise = function (file) {
+ return new Promise(function (resolve, reject) {
+ loadXHR(resolve, reject, file, loadingFiles, DOWNLOAD_ATTEMPTS_MAX);
+ });
+ };
+
+ this.preloadedFiles = [];
+ this.preload = function (pathOrBuffer, destPath) {
+ let buffer = null;
+ if (typeof pathOrBuffer === 'string') {
+ const me = this;
+ return this.loadPromise(pathOrBuffer).then(function (xhr) {
+ me.preloadedFiles.push({
+ path: destPath || pathOrBuffer,
+ buffer: xhr.response,
+ });
+ return Promise.resolve();
+ });
+ } else if (pathOrBuffer instanceof ArrayBuffer) {
+ buffer = new Uint8Array(pathOrBuffer);
+ } else if (ArrayBuffer.isView(pathOrBuffer)) {
+ buffer = new Uint8Array(pathOrBuffer.buffer);
+ }
+ if (buffer) {
+ this.preloadedFiles.push({
+ path: destPath,
+ buffer: pathOrBuffer,
+ });
+ return Promise.resolve();
+ }
+ return Promise.reject(new Error('Invalid object for preloading'));
+ };
+};
diff --git a/platform/javascript/js/engine/utils.js b/platform/javascript/js/engine/utils.js
new file mode 100644
index 0000000000..d0fca4e1cb
--- /dev/null
+++ b/platform/javascript/js/engine/utils.js
@@ -0,0 +1,56 @@
+const Utils = { // eslint-disable-line no-unused-vars
+
+ createLocateRewrite: function (execName) {
+ function rw(path) {
+ if (path.endsWith('.worker.js')) {
+ return `${execName}.worker.js`;
+ } else if (path.endsWith('.audio.worklet.js')) {
+ return `${execName}.audio.worklet.js`;
+ } else if (path.endsWith('.js')) {
+ return `${execName}.js`;
+ } else if (path.endsWith('.wasm')) {
+ return `${execName}.wasm`;
+ }
+ return path;
+ }
+ return rw;
+ },
+
+ createInstantiatePromise: function (wasmLoader) {
+ let loader = wasmLoader;
+ function instantiateWasm(imports, onSuccess) {
+ loader.then(function (xhr) {
+ WebAssembly.instantiate(xhr.response, imports).then(function (result) {
+ onSuccess(result['instance'], result['module']);
+ });
+ });
+ loader = null;
+ return {};
+ }
+
+ return instantiateWasm;
+ },
+
+ findCanvas: function () {
+ const nodes = document.getElementsByTagName('canvas');
+ if (nodes.length && nodes[0] instanceof HTMLCanvasElement) {
+ return nodes[0];
+ }
+ return null;
+ },
+
+ isWebGLAvailable: function (majorVersion = 1) {
+ let testContext = false;
+ try {
+ const testCanvas = document.createElement('canvas');
+ if (majorVersion === 1) {
+ testContext = testCanvas.getContext('webgl') || testCanvas.getContext('experimental-webgl');
+ } else if (majorVersion === 2) {
+ testContext = testCanvas.getContext('webgl2') || testCanvas.getContext('experimental-webgl2');
+ }
+ } catch (e) {
+ // Not available
+ }
+ return !!testContext;
+ },
+};
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