1 files changed, 253 insertions, 0 deletions
diff --git a/platform/javascript/engine/engine.js b/platform/javascript/engine/engine.js
new file mode 100644
index 0000000000..adcd919a6b
--- /dev/null
+++ b/platform/javascript/engine/engine.js
@@ -0,0 +1,253 @@
+Function('return this')()['Engine'] = (function() {
+	var preloader = new Preloader();
+
+	var wasmExt = '.wasm';
+	var unloadAfterInit = true;
+	var loadPath = '';
+	var loadPromise = null;
+	var initPromise = null;
+	var stderr = null;
+	var stdout = null;
+	var 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() {
+		this.canvas = null;
+		this.executableName = '';
+		this.rtenv = null;
+		this.customLocale = null;
+		this.resizeCanvasOnStart = false;
+		this.onExecute = null;
+		this.onExit = null;
+		this.persistentPaths = [];
+	};
+
+	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);
+		}
+		var config = {};
+		if (typeof stdout === 'function')
+			config.print = stdout;
+		if (typeof stderr === 'function')
+			config.printErr = stderr;
+		var 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.
+		var args = [];
+		for (var i = 0; i < arguments.length; i++) {
+			args.push(arguments[i]);
+		}
+		var 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();
+			}
+
+			// 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");
+				ev.preventDefault();
+			}, false);
+
+			// Browser locale, or custom one if defined.
+			var locale = me.customLocale;
+			if (!locale) {
+				locale = navigator.languages ? navigator.languages[0] : navigator.language;
+				locale = locale.split('.')[0];
+			}
+			me.rtenv['locale'] = locale;
+			me.rtenv['canvas'] = me.canvas;
+			me.rtenv['thisProgram'] = me.executableName;
+			me.rtenv['resizeCanvasOnStart'] = me.resizeCanvasOnStart;
+			me.rtenv['noExitRuntime'] = true;
+			me.rtenv['onExecute'] = me.onExecute;
+			me.rtenv['onExit'] = function(code) {
+				if (me.onExit)
+					me.onExit(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;
+		var me = this;
+		return Promise.all([
+			this.init(execName),
+			this.preloadFile(mainPack, mainPack)
+		]).then(function() {
+			var 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) {
+		var print = function(text) {
+			if (arguments.length > 1) {
+				text = Array.prototype.slice.call(arguments).join(" ");
+			}
+			func(text);
+		};
+		if (this.rtenv)
+			this.rtenv.print = print;
+		stdout = print;
+	};
+
+	Engine.prototype.setStderrFunc = function(func) {
+		var printErr = function(text) {
+			if (arguments.length > 1)
+				text = Array.prototype.slice.call(arguments).join(" ");
+			func(text);
+		};
+		if (this.rtenv)
+			this.rtenv.printErr = printErr;
+		stderr = printErr;
+	};
+
+	Engine.prototype.setOnExecute = function(onExecute) {
+		if (this.rtenv)
+			this.rtenv.onExecute = 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;
+	};
+
+	// 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;
+	return Engine;
+})();