feat: nes emulator

Author: 1zun4

examples/nes_emulator/emu/controller.js

@@ -0,0 +1,25 @@
+var Controller = function () {
+    this.state = new Array(8);
+    for (var i = 0; i < this.state.length; i++) {
+        this.state[i] = 0x40;
+    }
+};
+
+Controller.BUTTON_A = 0;
+Controller.BUTTON_B = 1;
+Controller.BUTTON_SELECT = 2;
+Controller.BUTTON_START = 3;
+Controller.BUTTON_UP = 4;
+Controller.BUTTON_DOWN = 5;
+Controller.BUTTON_LEFT = 6;
+Controller.BUTTON_RIGHT = 7;
+
+Controller.prototype = {
+    buttonDown: function (key) {
+        this.state[key] = 0x41;
+    },
+
+    buttonUp: function (key) {
+        this.state[key] = 0x40;
+    }
+};