first working version with sound

web/src/audiolet.js

@@ -0,0 +1,60 @@
+class APU extends AudioWorkletProcessor {
+    constructor() {
+        super();
+        this.sampleIndex = 0;
+        this.port.onmessage = (ev) => {
+            this.load(ev.data[0], ev.data[1]);
+        };
+    }
+
+    async load(platform_data, data) {
+        let memory = new WebAssembly.Memory({ initial: 4, maximum: 4 });
+
+        let importObject = {
+            env: {
+                memory
+            },
+        };
+
+        for (let n of ['acos', 'asin', 'atan', 'atan2', 'cos', 'exp', 'log', 'sin', 'tan', 'pow']) {
+            importObject.env[n] = Math[n];
+        }
+
+        for (let i = 9; i < 64; ++i) {
+            importObject.env['reserved' + i] = () => { };
+        }
+
+        for (let i = 0; i < 16; ++i) {
+            importObject.env['g_reserved' + i] = 0;
+        }
+
+        let instantiate = async (data) => (await WebAssembly.instantiate(data, importObject)).instance;
+
+        let platform_instance = await instantiate(platform_data);
+
+        for (let name in platform_instance.exports) {
+            importObject.env[name] = platform_instance.exports[name]
+        }
+
+        let instance = await instantiate(data);
+
+        this.snd = instance.exports.snd;
+    }
+
+    process(inputs, outputs, parameters) {
+        if(this.snd) {
+            let channels = outputs[0];
+            let index = this.sampleIndex;
+            let numSamples = channels[0].length;
+            for(let i = 0; i < numSamples; ++i) {
+                channels[0][i] = this.snd(index++);
+                channels[1][i] = this.snd(index++);
+            }
+            this.sampleIndex = index & 0xffffffff;
+        }
+
+        return true;
+    }
+}
+
+registerProcessor('apu', APU);