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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>WebAssembly Example</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<!-- Include the JavaScript glue code. -->
<!-- This will load the WebAssembly module and run its main. -->
<script src="index.js"></script>
<script type='text/javascript'>
var Module = {};
fetch('index.wasm')
.then(response =>
response.arrayBuffer()
).then(buffer => {
Module.canvas = document.getElementById("canvas");
Module.wasmBinary = buffer;
var script = document.createElement('script');
script.src = "index.js";
script.onload = function() {
console.log("Emscripten boilerplate loaded.");
run_dft = Module.cwrap("dft", [],[['float'],['float'],'number','number']);
run_fft= Module.cwrap( "fft_1",[],[['float'],['float'],'number','number']);
var inputData = document.querySelector('.inputData');
document.querySelector("#calcButton").onclick = function() {
console.log("calc FFT");
function cArray(size) {
var offset = Module._malloc(size * 8);
Module.HEAPF64.set(new Float64Array(size), offset / 8);
return {
"data": Module.HEAPF64.subarray(offset / 8, offset / 8 + size),
"offset": offset
}
}
var strArr = inputData.value;
strArr = strArr.replace(/ +(?= )/g,'');
var splArr = strArr.split(" ");
if (splArr.some(i => i != parseFloat(i))) {
throw i + " is not integer"
}
//max size 8 values, as thats enought for a demo
//https://stackoverflow.com/questions/17883799/how-to-handle-passing-returning-array-pointers-to-emscripten-compiled-code
myArray = cArray(8).fill(0.0);
}
} //end onload
document.body.appendChild(script);
});
</script>
FFT demo
<textarea class="inputData">12 12 12</textarea>
<button id="calcButton" type="button">Cals</button>
<script>
function calcFFT() {
console.log("Calculate FFT")
var arrStr = inputData.value;
console.log(arrStr)
}
</script>
</body>
</html>
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