Status

W3C Draft:

www.w3.org/TR/gamepad/

Editors:

• Ted Mielczarek (Mozilla)
• Scott Graham (Google)

Browser Support

Chrome

Version 21+ (prefixes)

Firefox

Version 29+ (Australis - April 29th 2014)

Version 24+ (prefixes⁄config)

Other browsers?

• Opera - only rumors
• Safari - no support
• IE - in development

Case Study: Hungry Fridge

The idea

GitHub Game Off II theme: Change

• Good food vs bad food
• Mobile vs desktop

Good food vs bad food

Mobile vs desktop

Gamepad API Implementation

Privacy: interact first while the page is visible to get the event

Connecting the Gamepad

window.addEventListener("gamepadconnected", function(e) {
	console.log("Gamepad connected: "+e.gamepad.id);
});

Detecting disconnection

window.addEventListener("gamepaddisconnected", function(e) {
	console.log("Gamepad disconnected: "+e.gamepad.id);
});

The Gamepad Object

• id - information about the controller
• index - unique integer of the connected device
• connected - true if connected
• mapping - layout of the buttons, "standard"
• axes - array of floating point values, state of each axis
• buttons - array of GamepadButton objects, state of each button, pressed and value properties

Detecting button presses

function addgamepad(gamepad) {
  controllers[gamepad.index] = gamepad;
  window.requestAnimationFrame(updateStatus);
}

function updateStatus() {
  for(c in controllers) {
    var controller = controllers[c];
    for(var i=0; i<controller.buttons.length; i++) {
      var buttonPressed = controller.buttons[i].pressed;
      if(buttonPressed) {
        console.log("Button id="+i+" was pressed");
      } else {
        console.log("Button id="+i+" was released");
      }
    }
  }
}

Axis threshold

Buttons: integer, 0 or 1.

Axes: float, -1 to 1.

Config.threshold = 0.5;