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WebAssembly in Dart for web example
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <meta name="scaffolded-by" content="https://github.com/google/stagehand" /> | |
| <title>webassembly_example</title> | |
| <link rel="stylesheet" href="styles.css" /> | |
| <link rel="icon" href="favicon.ico" /> | |
| <script defer src="main.dart.js"></script> | |
| </head> | |
| <body></body> | |
| </html> |
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| // web/main.dart | |
| import 'dart:html'; | |
| import 'package:js/js_util.dart'; | |
| import './wa_interop.dart'; | |
| void main() async { | |
| var request = await HttpRequest.request( | |
| './simple.wasm', | |
| responseType: 'arraybuffer', | |
| mimeType: 'application/wasm', | |
| ); | |
| var wa = await instantiate( | |
| request.response, | |
| jsObj({ | |
| 'imports': { | |
| 'imported_func': (args) => window.console.log(args), | |
| }) | |
| }); | |
| wa.then((results) { | |
| window.console.log(results); | |
| var exportsObj = getProperty(results.instance, 'exports'); | |
| Function exportedFn = getProperty(exportsObj, 'exported_func'); | |
| exportedFn(); | |
| }); | |
| } |
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| ;; web/simple.wasm | |
| (module | |
| (type $t0 (func (param i32))) | |
| (type $t1 (func)) | |
| (import "imports" "imported_func" (func $imports.imported_func (type $t0))) | |
| (func $exported_func (type $t1) | |
| i32.const 42 | |
| call $imports.imported_func) | |
| (export "exported_func" (func $exported_func))) |
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| // web/wa_interop.dart | |
| @JS('WebAssembly') | |
| library wasm_interop; | |
| import 'dart:html'; | |
| import 'package:js/js.dart'; | |
| import 'package:js/js_util.dart'; | |
| @JS() | |
| external instantiate(bytes, dynamic importObj); | |
| jsObj(Map<String, dynamic> dartMap) { | |
| var jsObject = newObject(); | |
| dartMap.forEach((name, value) { | |
| if (value is Map<String, dynamic>) { | |
| setProperty(jsObject, name, jsObj(value)); | |
| } else { | |
| setProperty(jsObject, name, value); | |
| } | |
| }); | |
| return jsObject; | |
| } |
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This uses the js package for interop with WebAssembly's
instantiate()method.