Created
January 28, 2022 05:56
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WebAssembly (C++) in a Web Worker
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| #include <iostream> | |
| #include <string> | |
| #include "dog.h" | |
| #include "emscripten/bind.h" | |
| using namespace emscripten; | |
| using namespace std; | |
| Dog::Dog( string n ): name( n ) {} | |
| string Dog::getName() { | |
| return name; | |
| } | |
| void Dog::setName( string n ) { | |
| name = n; | |
| } | |
| string Dog::bark() { | |
| return "Hello, " + name; | |
| } | |
| EMSCRIPTEN_BINDINGS ( c ) { | |
| class_<Dog>( "Dog" ) | |
| .constructor<string>() | |
| .function( "bark", &Dog::bark ) | |
| .function( "getName", &Dog::getName ) | |
| .function( "setName", &Dog::setName ); | |
| } |
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| #ifndef DOG_H | |
| #define DOG_H | |
| #include <string> | |
| using std::string; | |
| class Dog { | |
| string name; | |
| public: | |
| Dog( string n ); | |
| string getName(); | |
| void setName( string n ); | |
| string bark(); | |
| }; | |
| #endif |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Dog</title> | |
| </head> | |
| <body> | |
| <p></p> | |
| <script> | |
| const label = document.querySelector( 'p' ); | |
| const solver = new Worker( 'worker.js' ); | |
| solver.addEventListener( 'message', ( evt ) => { | |
| if( evt.data.type === 'init' ) { | |
| solver.postMessage( {type: 'name', value: 'Kevin'} ); | |
| } else if( evt.data.type === 'name' ) { | |
| solver.postMessage( {type: 'bark'} ); | |
| } else if( evt.data.type === 'bark' ) { | |
| console.log( evt.data.value ); | |
| label.innerText = evt.data.value; | |
| } | |
| } ); | |
| solver.postMessage( {type: 'init'} ); | |
| </script> | |
| </body> | |
| </html> |
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| emcc --bind -Oz dog.cc -o dog.js \ | |
| -s WASM=1 -s NO_EXIT_RUNTIME=1 -s "EXPORTED_RUNTIME_METHODS=['addOnPostRun']" \ | |
| || exit 1 |
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| let dog = null; | |
| addEventListener( 'message', ( evt ) => { | |
| if( evt.data.type === 'init' ) { | |
| console.log( 'WORKER: INIT' ); | |
| importScripts( 'dog.js' ); | |
| Module.addOnPostRun( () => { | |
| dog = new Module.Dog( 'Snoopy' ); | |
| console.log( dog ); | |
| } ); | |
| postMessage( {type: 'init'} ); | |
| } else if( evt.data.type === 'bark' ) { | |
| console.log( 'WORKER: BARK' ); | |
| postMessage( {type: 'bark', value: dog.bark()} ) | |
| } else if( evt.data.type === 'name' ) { | |
| console.log( 'WORKER: NAME' ); | |
| dog.setName( evt.data.value ); | |
| postMessage( {type: 'name'} ); | |
| } | |
| }, false ); |
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