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 struct 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.
  27 struct 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.
  61 struct 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.
  74 struct ContentGamepadHardwareBuffer {
  75   base::subtle::Atomic32 sequence;
  76   WebKitGamepads buffer;
  77 };
  78
  79 #pragma pack(pop)
  80
  81 PPAPI_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_