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<!DOCTYPE html>
<meta charset="utf-8">
<title>WebAssembly Example</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 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_shuffle = Module.cwrap("ffti_shuffle_1", [],[['float'],['float'],'number']);
run_fft = Module.cwrap("fft_1", [],[['float'],['float'],'number','number']);
var inputDataI = document.querySelector('.inputDataI');
var inputDataIerr = document.querySelector('.inputDataIerr');
var inputDataQ = document.querySelector('.inputDataQ');
var inputDataQerr = document.querySelector('.inputDataQerr');
var outputDataI = document.querySelector('.outputDataI');
var outputDataQ = document.querySelector('.outputDataQ');
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
}
}
function checkArr(inputData,errorOutput) {
var strArr = inputData.value;
strArr = strArr.replace(/ +(?= )/g,'');
var splArr = strArr.split(" ");
var data = Array(splArr.length).fill(0);
for (let i=0; i<splArr.length;i++) {
try {
var j=splArr[i];
if ( j != parseFloat(j)) throw new Error("ERROR: not float "+splArr[i]+" at index "+i);
data[i] = parseFloat(j)
} catch (err) {
console.log("Error: ",err.message)
errorOutput.innerHTML = err.message;
return {"result":false,"data":[]};
}
}
return {"result":true,"data":data};
}
console.log("checkArr");
var arrIok = checkArr(inputDataI,inputDataIerr);
console.log("checkArr");
var arrQok = checkArr(inputDataQ,inputDataQerr);
//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
if (!arrIok.result) return;
if (!arrQok.result) return;
var N=8;
var myArray_i = cArray(N);
var myArray_q = cArray(N);
//set test data
for(let i=0,j=0;i<N,j<arrIok.data.length;i++,j++) {
myArray_i.data[i] = arrIok.data[j];
}
for(let i=0,j=0;i<N,j<arrQok.data.length;i++,j++) {
myArray_q.data[i] = arrQok.data[j];
}
console.log(myArray_i.data);
console.log(myArray_q.data);
//DFT
run_dft(myArray_i.offset,myArray_q.offset,N,0);
//FFT
//run_fft_shuffle(myArray_i.offset,myArray_q.offset,N);
//run_fft(myArray_i.offset,myArray_q.offset,N,1);
console.log(myArray_i.data);
console.log(myArray_q.data)
function outputResult(array,output) {
var arr = Array(array.slice(0,N));
arr = arr.map(function(item){
return item.map(function(num){
return parseFloat(num.toFixed(4));
});
});
output.value = arr;
}
outputResult(myArray_i.data, outputDataI);
outputResult(myArray_q.data, outputDataQ);
}
} //end onload
document.body.appendChild(script);
});
</script>
<script>
</script>
FFT demo, max value N=8 </br>
Input I:<textarea class="inputDataI">1 1 0</textarea><sup class="inputDataIerr"></sup></br>
Input Q:<textarea class="inputDataQ">0 0 0</textarea><sup class="inputDataQerr"></sup></br>
Output I:<textarea class="outputDataI"></textarea></br>
Output Q:<textarea class="outputDataQ"></textarea></br>
<button id="calcButton" type="button">Cals</button></br>
<script>
function calcFFT() {
console.log("Calculate FFT")
var arrStr = inputData.value;
console.log(arrStr)
}
</script>
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