content/browser/gamepad/gamepad_platform_data_fetcher_win.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 CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
   6 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
   7
   8 #include "build/build_config.h"
   9
  10 #ifndef WIN32_LEAN_AND_MEAN
  11 #define WIN32_LEAN_AND_MEAN
  12 #endif
  13 #define DIRECTINPUT_VERSION 0x0800
  14 #include <dinput.h>
  15 #include <stdlib.h>
  16 #include <Unknwn.h>
  17 #include <WinDef.h>
  18 #include <windows.h>
  19 #include <XInput.h>
  20
  21 #include "base/basictypes.h"
  22 #include "base/compiler_specific.h"
  23 #include "base/scoped_native_library.h"
  24 #include "content/browser/gamepad/gamepad_data_fetcher.h"
  25 #include "content/browser/gamepad/gamepad_standard_mappings.h"
  26 #include "third_party/WebKit/public/platform/WebGamepads.h"
  27
  28 namespace content {
  29
  30 class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
  31  public:
  32   GamepadPlatformDataFetcherWin();
  33   virtual ~GamepadPlatformDataFetcherWin();
  34   virtual void GetGamepadData(blink::WebGamepads* pads,
  35                               bool devices_changed_hint) OVERRIDE;
  36  private:
  37   // XInput-specific implementation for GetGamepadData.
  38   bool GetXInputGamepadData(blink::WebGamepads* pads,
  39                             bool devices_changed_hint);
  40   bool GetDirectInputGamepadData(blink::WebGamepads* pads,
  41                                  bool devices_changed_hint);
  42
  43   // The three function types we use from xinput1_3.dll.
  44   typedef void (WINAPI *XInputEnableFunc)(BOOL enable);
  45   typedef DWORD (WINAPI *XInputGetCapabilitiesFunc)(
  46     DWORD dwUserIndex, DWORD dwFlags, XINPUT_CAPABILITIES* pCapabilities);
  47   typedef DWORD (WINAPI *XInputGetStateFunc)(
  48       DWORD dwUserIndex, XINPUT_STATE* pState);
  49
  50   // Get functions from dynamically loaded xinput1_3.dll. We don't use
  51   // DELAYLOAD because the import library for Win8 SDK pulls xinput1_4 which
  52   // isn't redistributable. Returns true if loading was successful. We include
  53   // xinput1_3.dll with Chrome.
  54   bool GetXInputDllFunctions();
  55
  56   // Scan for connected XInput and DirectInput gamepads.
  57   void EnumerateDevices(blink::WebGamepads* pads);
  58   bool GetXInputPadConnectivity(int i, blink::WebGamepad* pad) const;
  59
  60   void GetXInputPadData(int i, blink::WebGamepad* pad);
  61   void GetDirectInputPadData(int i, blink::WebGamepad* pad);
  62
  63   int FirstAvailableGamepadId() const;
  64   bool HasXInputGamepad(int index) const;
  65   bool HasDirectInputGamepad(const GUID &guid) const;
  66
  67   base::ScopedNativeLibrary xinput_dll_;
  68   bool xinput_available_;
  69   bool directinput_available_;
  70
  71   // Function pointers to XInput functionality, retrieved in
  72   // |GetXinputDllFunctions|.
  73   XInputEnableFunc xinput_enable_;
  74   XInputGetCapabilitiesFunc xinput_get_capabilities_;
  75   XInputGetStateFunc xinput_get_state_;
  76
  77   IDirectInput8* directinput_interface_;
  78
  79   enum PadConnectionStatus {
  80     DISCONNECTED,
  81     XINPUT_CONNECTED,
  82     DIRECTINPUT_CONNECTED
  83   };
  84
  85   struct PadState {
  86     PadConnectionStatus status;
  87     int xinput_index;  // XInput-only.
  88     // Fields below are for DirectInput devices only.
  89     GUID guid;
  90     IDirectInputDevice8* directinput_gamepad;
  91     GamepadStandardMappingFunction mapper;
  92   };
  93   PadState pad_state_[blink::WebGamepads::itemsLengthCap];
  94
  95   DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherWin);
  96 };
  97
  98 }  // namespace content
  99
 100 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_