From d0da90a25eda1a77051372ff2a6e2fedf87125ac Mon Sep 17 00:00:00 2001
From: Gregg Tavares <github@greggman.com>
Date: Fri, 22 Feb 2019 14:57:35 +0900
Subject: [PATCH] initial commit

---
 index.html | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 index.html
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..a977734
--- /dev/null
+++ b/index.html
@@ -0,0 +1,81 @@
+<body>
+<h1>HTML5 Gamepad Test</h1>
+<div id="running"></div>
+<div id="gamepads"></div>
+</body>
+<script>
+
+const runningElem = document.querySelector('#running');
+const gamepadsElem = document.querySelector('#gamepads');
+const gamepadsByIndex = {};
+
+function addGamepad(gamepad) {
+  console.log('add:', gamepad.index);
+  const elem = document.createElement('pre');
+  gamepadsElem.appendChild(elem);
+
+  gamepadsByIndex[gamepad.index] = {
+    gamepad,
+    elem,
+  };
+}
+
+function removeGamepad(gamepad) {
+  const info = gamepadsByIndex[gamepad.index];
+  if (info) {
+    delete gamepadsByIndex[gamepad.index];
+    info.elem.parentElement.removeChild(info.elem);
+  }
+}
+
+function addGamepadIfNew(gamepad) {
+  if (!gamepadsByIndex[gamepad.index]) {
+    addGamepad(gamepad);
+  }
+}
+
+function handleConnect(e) {
+  console.log('connect');
+  addGamepadIfNew(e.gamepad);
+}
+
+function handleDisconnect(e) {
+  console.log('disconnect');
+  removeGamepad(e.gamepad);
+}
+
+const keys = ['connected', 'displayId', 'mapping', /*'timestamp'*/];
+function processController(info) {
+  const {elem, gamepad} = info;
+  const lines = [`gamepad:${gamepad.index}`];
+  for (const key of keys) {
+    lines.push(`${key}: ${gamepad[key]}`);
+  }
+  lines.push(gamepad.axes.map((v, ndx) => `${ndx}: ${v.toFixed(2)}`).join(','));
+  lines.push(gamepad.buttons.map((v, ndx) => `${ndx}: ${v.pressed}, ${v.value.toFixed(2)}`).join(','));
+  elem.textContent = lines.join('\n');
+}
+
+function addNewPads() {
+  const gamepads = navigator.getGamepads();
+  for (let i = 0; i < gamepads.length; i++) {
+    const gamepad = gamepads[i]
+    if (gamepad) {
+      addGamepadIfNew(gamepad);
+    }
+  }
+}
+
+window.addEventListener("gamepadconnected", handleConnect);
+window.addEventListener("gamepaddisconnected", handleDisconnect);
+
+function process() {
+  runningElem.textContent = ((performance.now() * 0.001 * 60 | 0) % 100).toString().padStart(2, '0');
+  addNewPads();  // some browsers add by polling, others by event
+
+  Object.values(gamepadsByIndex).forEach(processController);
+  requestAnimationFrame(process);
+}
+requestAnimationFrame(process);
+
+</script>
