URLchess/index.tinygo.wasm.html at master · jezek/URLchess · GitHub

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<!DOCTYPE html>
	<head>
		<title>URLchess</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no">
		<link rel="preload" href="assets/URLchess.css?v0.10" as="style" onload="this.rel='stylesheet'">
	</head>
	<body>
		<noscript>
			<p>You need to enable JavaScript to run URLchess.</p>
		</noscript>
		<script type="text/javascript">
//<![CDATA[
window.addEventListener("load", function() {
	// Backwards compatibility with URLchess links when version was 0.6 and lower.
	var hash = window.location.hash;
	var search = window.location.search;
	if (search.startsWith("?")) {
		search = search.slice(1);
	}
	if (
		(search.length > 0 && hash.length == 0)
		||
		(search.length == 0 && hash.length == 0 && window.location.href.indexOf("?") != -1)
	){
		//window.alert("URL is in format for URLchess version <=0.6, transforming...");
		window.location.href = window.location.href.replace("?", "#");
	}

	// If browser supports wasm, run URLchess.wasm.
	if (typeof WebAssembly === "object") {
		// Load and execute go wasm runtime.
		var script = document.createElement('script');
		script.src = "assets/wasm_exec.tinygo.js?v0.10";
		script.onload = function() {
			// After wasm runtime is loaded, continue to run the URLchess wasm app.

			// Check if go is present.
			if (typeof Go === "undefined") {
				alert("Go runtime is not loaded.");
				return;
			}

			// Start the Go WebAssembly runtime and run URLchess wasm app.
			const go = new Go();

			// Try to rewrite finalizeRef function according to https://github.com/tinygo-org/tinygo/issues/1140#issuecomment-2529705551
			go.importObject.gojs["syscall/js.finalizeRef"] = function(v_ref) {
				// Note: TinyGo does not support finalizers so this is only called
				// for one specific case, by js.go:jsString. and can/might leak memory.

				// magicValue taken from `unboxValue` function.
				const magicValue = 0xffffffffn;
				const id = v_ref & magicValue;
				if (this._goRefCounts?.[id] !== undefined) {
					this._goRefCounts[id]--;
					if (this._goRefCounts[id] === 0) {
						const v = this._values[id];
						this._values[id] = null;
						this._ids.delete(v);
						this._idPool.push(id);
					}
				} else {
					console.log("syscall/js.finalizeRef: unknown id", id);
				}
			};

			WebAssembly.instantiateStreaming(fetch("assets/URLchess.tinygo.wasm?v0.10"), go.importObject).then((result) => {
				go.run(result.instance);
			}).catch((err) => {
				alert("Failed to load WebAssembly", err);
			});
		};

		// Append the script with wasm to body.
		document.body.appendChild(script);
	} else {
		alert("No wasm in browser!");
	}
});
//]]>
		</script>
	</body>
</html>