1 files changed, 189 insertions, 0 deletions
diff --git a/projects/chip8emu/chip8emu.worker.js b/projects/chip8emu/chip8emu.worker.js
new file mode 100644
index 0000000..50d45de
--- /dev/null
+++ b/projects/chip8emu/chip8emu.worker.js
@@ -0,0 +1,189 @@
+/**
+ * @license
+ * Copyright 2015 The Emscripten Authors
+ * SPDX-License-Identifier: MIT
+ */
+
+// Pthread Web Worker startup routine:
+// This is the entry point file that is loaded first by each Web Worker
+// that executes pthreads on the Emscripten application.
+
+'use strict';
+
+var Module = {};
+
+// Node.js support
+var ENVIRONMENT_IS_NODE = typeof process == 'object' && typeof process.versions == 'object' && typeof process.versions.node == 'string';
+if (ENVIRONMENT_IS_NODE) {
+  // Create as web-worker-like an environment as we can.
+
+  var nodeWorkerThreads = require('worker_threads');
+
+  var parentPort = nodeWorkerThreads.parentPort;
+
+  parentPort.on('message', (data) => onmessage({ data: data }));
+
+  var fs = require('fs');
+  var vm = require('vm');
+
+  Object.assign(global, {
+    self: global,
+    require,
+    Module,
+    location: {
+      href: __filename
+    },
+    Worker: nodeWorkerThreads.Worker,
+    importScripts: (f) => vm.runInThisContext(fs.readFileSync(f, 'utf8'), {filename: f}),
+    postMessage: (msg) => parentPort.postMessage(msg),
+    performance: global.performance || { now: Date.now },
+  });
+}
+
+// Thread-local guard variable for one-time init of the JS state
+var initializedJS = false;
+
+function assert(condition, text) {
+  if (!condition) abort('Assertion failed: ' + text);
+}
+
+function threadPrintErr() {
+  var text = Array.prototype.slice.call(arguments).join(' ');
+  // See https://github.com/emscripten-core/emscripten/issues/14804
+  if (ENVIRONMENT_IS_NODE) {
+    fs.writeSync(2, text + '\n');
+    return;
+  }
+  console.error(text);
+}
+function threadAlert() {
+  var text = Array.prototype.slice.call(arguments).join(' ');
+  postMessage({cmd: 'alert', text, threadId: Module['_pthread_self']()});
+}
+// We don't need out() for now, but may need to add it if we want to use it
+// here. Or, if this code all moves into the main JS, that problem will go
+// away. (For now, adding it here increases code size for no benefit.)
+var out = () => { throw 'out() is not defined in worker.js.'; }
+var err = threadPrintErr;
+self.alert = threadAlert;
+var dbg = threadPrintErr;
+
+Module['instantiateWasm'] = (info, receiveInstance) => {
+  // Instantiate from the module posted from the main thread.
+  // We can just use sync instantiation in the worker.
+  var module = Module['wasmModule'];
+  // We don't need the module anymore; new threads will be spawned from the main thread.
+  Module['wasmModule'] = null;
+  var instance = new WebAssembly.Instance(module, info);
+  // TODO: Due to Closure regression https://github.com/google/closure-compiler/issues/3193,
+  // the above line no longer optimizes out down to the following line.
+  // When the regression is fixed, we can remove this if/else.
+  return receiveInstance(instance);
+}
+
+// Turn unhandled rejected promises into errors so that the main thread will be
+// notified about them.
+self.onunhandledrejection = (e) => {
+  throw e.reason || e;
+};
+
+function handleMessage(e) {
+  try {
+    if (e.data.cmd === 'load') { // Preload command that is called once per worker to parse and load the Emscripten code.
+
+    // Until we initialize the runtime, queue up any further incoming messages.
+    let messageQueue = [];
+    self.onmessage = (e) => messageQueue.push(e);
+
+    // And add a callback for when the runtime is initialized.
+    self.startWorker = (instance) => {
+      // Notify the main thread that this thread has loaded.
+      postMessage({ 'cmd': 'loaded' });
+      // Process any messages that were queued before the thread was ready.
+      for (let msg of messageQueue) {
+        handleMessage(msg);
+      }
+      // Restore the real message handler.
+      self.onmessage = handleMessage;
+    };
+
+      // Module and memory were sent from main thread
+      Module['wasmModule'] = e.data.wasmModule;
+
+      // Use `const` here to ensure that the variable is scoped only to
+      // that iteration, allowing safe reference from a closure.
+      for (const handler of e.data.handlers) {
+        Module[handler] = (...args) => {
+          postMessage({ cmd: 'callHandler', handler, args: args });
+        }
+      }
+
+      Module['wasmMemory'] = e.data.wasmMemory;
+
+      Module['buffer'] = Module['wasmMemory'].buffer;
+
+      Module['workerID'] = e.data.workerID;
+
+      Module['ENVIRONMENT_IS_PTHREAD'] = true;
+
+      if (typeof e.data.urlOrBlob == 'string') {
+        importScripts(e.data.urlOrBlob);
+      } else {
+        var objectUrl = URL.createObjectURL(e.data.urlOrBlob);
+        importScripts(objectUrl);
+        URL.revokeObjectURL(objectUrl);
+      }
+    } else if (e.data.cmd === 'run') {
+      // Pass the thread address to wasm to store it for fast access.
+      Module['__emscripten_thread_init'](e.data.pthread_ptr, /*is_main=*/0, /*is_runtime=*/0, /*can_block=*/1);
+
+      // Await mailbox notifications with `Atomics.waitAsync` so we can start
+      // using the fast `Atomics.notify` notification path.
+      Module['__emscripten_thread_mailbox_await'](e.data.pthread_ptr);
+
+      assert(e.data.pthread_ptr);
+      // Also call inside JS module to set up the stack frame for this pthread in JS module scope
+      Module['establishStackSpace']();
+      Module['PThread'].receiveObjectTransfer(e.data);
+      Module['PThread'].threadInitTLS();
+
+      if (!initializedJS) {
+        initializedJS = true;
+      }
+
+      try {
+        Module['invokeEntryPoint'](e.data.start_routine, e.data.arg);
+      } catch(ex) {
+        if (ex != 'unwind') {
+          // The pthread "crashed".  Do not call `_emscripten_thread_exit` (which
+          // would make this thread joinable).  Instead, re-throw the exception
+          // and let the top level handler propagate it back to the main thread.
+          throw ex;
+        }
+      }
+    } else if (e.data.cmd === 'cancel') { // Main thread is asking for a pthread_cancel() on this thread.
+      if (Module['_pthread_self']()) {
+        Module['__emscripten_thread_exit'](-1);
+      }
+    } else if (e.data.target === 'setimmediate') {
+      // no-op
+    } else if (e.data.cmd === 'checkMailbox') {
+      if (initializedJS) {
+        Module['checkMailbox']();
+      }
+    } else if (e.data.cmd) {
+      // The received message looks like something that should be handled by this message
+      // handler, (since there is a e.data.cmd field present), but is not one of the
+      // recognized commands:
+      err(`worker.js received unknown command ${e.data.cmd}`);
+      err(e.data);
+    }
+  } catch(ex) {
+    err(`worker.js onmessage() captured an uncaught exception: ${ex}`);
+    if (ex?.stack) err(ex.stack);
+    Module['__emscripten_thread_crashed']?.();
+    throw ex;
+  }
+};
+
+self.onmessage = handleMessage;