device/gamepad/public/interfaces/gamepad.mojom

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module device.mojom;

struct GamepadQuaternion {
  float x;
  float y;
  float z;
  float w;
};

struct GamepadVector {
  float x;
  float y;
  float z;
};

struct GamepadButton {
  bool pressed;
  bool touched;
  double value;
};

struct GamepadPose {
  GamepadQuaternion? orientation;
  GamepadVector? position;
  GamepadVector? angular_velocity;
  GamepadVector? linear_velocity;
  GamepadVector? angular_acceleration;
  GamepadVector? linear_acceleration;
};

enum GamepadHand {
  GamepadHandNone = 0,
  GamepadHandLeft = 1,
  GamepadHandRight = 2
};

struct Gamepad {
  bool connected;
  array<uint16> id;
  uint64 timestamp;
  array<double> axes;
  array<GamepadButton> buttons;
  array<uint16> mapping;
  GamepadPose? pose;
  GamepadHand hand;
  uint32 display_id;
};

interface GamepadObserver {
  GamepadConnected(int32 index, Gamepad gamepad);
  GamepadDisconnected(int32 index, Gamepad gamepad);
};

// Asks the browser process to start polling, and return a shared memory
// handle that will hold the data from the hardware. See
// gamepad_shared_buffer.h for a description of how synchronization is
// handled. The number of Starts should match the number of Stops.
interface GamepadMonitor {
  [Sync]
  GamepadStartPolling() => (handle<shared_buffer> memory_handle);

  [Sync]
  GamepadStopPolling() => ();

  SetObserver(GamepadObserver gamepad_observer);
};