80 lines
2.2 KiB
JavaScript
80 lines
2.2 KiB
JavaScript
"use strict";
|
|
|
|
// Worker that manages a WebAssembly instance of the C core library
|
|
(globalThis.Emulator = class Emulator {
|
|
|
|
// Static initializer
|
|
static initializer() {
|
|
new Emulator();
|
|
}
|
|
|
|
// Object constructor
|
|
constructor() {
|
|
|
|
// Configure message port
|
|
onmessage = e=>this.onmessage(e.data);
|
|
}
|
|
|
|
|
|
|
|
///////////////////////////// Message Methods /////////////////////////////
|
|
|
|
// Message received
|
|
onmessage(msg) {
|
|
switch (msg.command) {
|
|
case "Init" : this.init (msg); break;
|
|
case "ReadBuffer": this.readBuffer(msg); break;
|
|
case "SetROM" : this.setROM (msg); break;
|
|
}
|
|
}
|
|
|
|
// Initialize the WebAssembly core module
|
|
async init(msg) {
|
|
|
|
// Load and instantiate the WebAssembly module
|
|
this.wasm = await WebAssembly.instantiate(msg.wasm,
|
|
{ env: { emscripten_notify_memory_growth: function(){} }});
|
|
this.wasm.instance.exports.Init();
|
|
|
|
// Configure instance fields
|
|
this.core = this.wasm.instance.exports;
|
|
this.memory = this.core.memory.buffer;
|
|
|
|
postMessage({ command: "Init" });
|
|
}
|
|
|
|
// Read multiple data units from the bus
|
|
readBuffer(msg) {
|
|
let buffer = this.malloc(Uint8Array, msg.size);
|
|
this.core.ReadBuffer(msg.sim, buffer.pointer, msg.address, msg.size);
|
|
msg.buffer = buffer.buffer.slice(
|
|
buffer.pointer, buffer.pointer + msg.size);
|
|
this.core.Free(buffer.pointer);
|
|
postMessage(msg, msg.buffer);
|
|
}
|
|
|
|
// Supply a ROM buffer
|
|
setROM(msg) {
|
|
let rom = new Uint8Array(msg.rom);
|
|
let buffer = this.malloc(Uint8Array, rom.length);
|
|
for (let x = 0; x < rom.length; x++)
|
|
buffer[x] = rom[x];
|
|
msg.success = !!this.core.SetROM(msg.sim, buffer.pointer, rom.length);
|
|
delete msg.rom;
|
|
postMessage(msg);
|
|
}
|
|
|
|
|
|
|
|
///////////////////////////// Utility Methods /////////////////////////////
|
|
|
|
// Allocate a typed array in WebAssembly core memory
|
|
malloc(type, size) {
|
|
let pointer = this.core.Malloc(size);
|
|
let ret = new type(this.memory, pointer, size);
|
|
ret.pointer = pointer;
|
|
return ret;
|
|
}
|
|
|
|
}).initializer();
|