1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef PPAPI_SHARED_IMPL_PPB_GAMEPAD_SHARED_H_
6#define PPAPI_SHARED_IMPL_PPB_GAMEPAD_SHARED_H_
7
8#include "base/atomicops.h"
9#include "base/strings/string16.h"
10#include "ppapi/c/ppb_gamepad.h"
11#include "ppapi/shared_impl/ppapi_shared_export.h"
12
13namespace ppapi {
14
15// TODO(brettw) when we remove the non-IPC-based gamepad implementation, this
16// code should all move into the GamepadResource.
17
18#pragma pack(push, 1)
19
20struct WebKitGamepadButton {
21  bool pressed;
22  double value;
23};
24
25// This must match the definition of blink::Gamepad. The GamepadHost unit test
26// has some compile asserts to validate this.
27struct WebKitGamepad {
28  static const size_t kIdLengthCap = 128;
29  static const size_t kMappingLengthCap = 16;
30  static const size_t kAxesLengthCap = 16;
31  static const size_t kButtonsLengthCap = 32;
32
33  // Is there a gamepad connected at this index?
34  bool connected;
35
36  // Device identifier (based on manufacturer, model, etc.).
37  base::char16 id[kIdLengthCap];
38
39  // Monotonically increasing value referring to when the data were last
40  // updated.
41  unsigned long long timestamp;
42
43  // Number of valid entries in the axes array.
44  unsigned axes_length;
45
46  // Normalized values representing axes, in the range [-1..1].
47  double axes[kAxesLengthCap];
48
49  // Number of valid entries in the buttons array.
50  unsigned buttons_length;
51
52  // Normalized values representing buttons, in the range [0..1].
53  WebKitGamepadButton buttons[kButtonsLengthCap];
54
55  // Mapping type (for example "standard")
56  base::char16 mapping[kMappingLengthCap];
57};
58
59// This must match the definition of blink::Gamepads. The GamepadHost unit
60// test has some compile asserts to validate this.
61struct WebKitGamepads {
62  static const size_t kItemsLengthCap = 4;
63
64  // Number of valid entries in the items array.
65  unsigned length;
66
67  // Gamepad data for N separate gamepad devices.
68  WebKitGamepad items[kItemsLengthCap];
69};
70
71// This is the structure store in shared memory. It must match
72// content/common/gamepad_hardware_buffer.h. The GamepadHost unit test has
73// some compile asserts to validate this.
74struct ContentGamepadHardwareBuffer {
75  base::subtle::Atomic32 sequence;
76  WebKitGamepads buffer;
77};
78
79#pragma pack(pop)
80
81PPAPI_SHARED_EXPORT void ConvertWebKitGamepadData(
82    const WebKitGamepads& webkit_data,
83    PP_GamepadsSampleData* output_data);
84
85}  // namespace ppapi
86
87#endif  // PPAPI_SHARED_IMPL_PPB_GAMEPAD_SHARED_H_
88