ppapi/shared_impl/ppb_gamepad_shared.h

   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
  13 namespace 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
  20 // This must match the definition of WebKit::Gamepad. The GamepadHost unit test
  21 // has some compile asserts to validate this.
  22 struct WebKitGamepad {
  23     static const size_t kIdLengthCap = 128;
  24     static const size_t kAxesLengthCap = 16;
  25     static const size_t kButtonsLengthCap = 32;
  26
  27     // Is there a gamepad connected at this index?
  28     bool connected;
  29
  30     // Device identifier (based on manufacturer, model, etc.).
  31     char16 id[kIdLengthCap];
  32
  33     // Monotonically increasing value referring to when the data were last
  34     // updated.
  35     unsigned long long timestamp;
  36
  37     // Number of valid entries in the axes array.
  38     unsigned axes_length;
  39
  40     // Normalized values representing axes, in the range [-1..1].
  41     float axes[kAxesLengthCap];
  42
  43     // Number of valid entries in the buttons array.
  44     unsigned buttons_length;
  45
  46     // Normalized values representing buttons, in the range [0..1].
  47     float buttons[kButtonsLengthCap];
  48 };
  49
  50 // This must match the definition of WebKit::Gamepads. The GamepadHost unit
  51 // test has some compile asserts to validate this.
  52 struct WebKitGamepads {
  53     static const size_t kItemsLengthCap = 4;
  54
  55     // Number of valid entries in the items array.
  56     unsigned length;
  57
  58     // Gamepad data for N separate gamepad devices.
  59     WebKitGamepad items[kItemsLengthCap];
  60 };
  61
  62 // This is the structure store in shared memory. It must match
  63 // content/common/gamepad_hardware_buffer.h. The GamepadHost unit test has
  64 // some compile asserts to validate this.
  65 struct ContentGamepadHardwareBuffer {
  66   base::subtle::Atomic32 sequence;
  67   WebKitGamepads buffer;
  68 };
  69
  70 #pragma pack(pop)
  71
  72 PPAPI_SHARED_EXPORT void ConvertWebKitGamepadData(
  73     const WebKitGamepads& webkit_data,
  74     PP_GamepadsSampleData* output_data);
  75
  76 }  // namespace ppapi
  77
  78 #endif  // PPAPI_SHARED_IMPL_PPB_GAMEPAD_SHARED_H_