83 lines
1.7 KiB
JavaScript
83 lines
1.7 KiB
JavaScript
'use strict';
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function _waitForStart(mod) {
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return new Promise((resolve, reject)=>{
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mod.addOnPostRun(resolve);
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});
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}
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module.exports = () => {
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// let state = 0; // idle
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// let total = 0;
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// let start = 0;
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const c = {};
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const wasm = require('../out/vcd.js');
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let bindCallback;
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const bindCWrap = () => {
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const w = wasm.cwrap;
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c.execute = w('execute', 'void', ['number', 'number', 'number', 'number']);
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};
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const start = async() => {
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await _waitForStart(wasm);
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bindCWrap();
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bindCallback();
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}
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// gets a string from a c heap pointer and length
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const getString = (name,len) => {
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const view = wasm.HEAPU8.subarray(name, name+len);
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let string = '';
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for (let i = 0; i < len; i++) {
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string += String.fromCharCode(view[i]);
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}
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return string;
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}
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let boundSet;
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// wasm.addFunction can't be called until after
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// start finishes
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bindCallback = () => {
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boundSet = wasm.addFunction(function(name, len, value) {
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let prop = getString(name, len);
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console.log(`setting ${prop} to ${value}`);
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// vsi means returns void accepts a string and int
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}, 'viii');
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};
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return {
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start,
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c,
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log: () => {
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console.log(wasm);
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},
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execute: () => {
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c.execute(0,0,boundSet,0);
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},
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onB: (time, cmd) => {
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},
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onNotB: (time, cmd) => {
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switch(state) {
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case 0: if (cmd === 14) { state = 2; } break;
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case 1: if (cmd === 14) { state = 3; start = time; } break;
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case 2: if (cmd === 15) { state = 0; } break;
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case 3: if (cmd === 15) { state = 1; total += (time - start); start = 0; } break;
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default: throw new Error();
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}
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},
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time: () => total + start
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};
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};
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