Implemented Gamepad support via Raw Input on Windows

content/browser/gamepad/gamepad_platform_data_fetcher_win.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
 
 #include "build/build_config.h"
 
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #define DIRECTINPUT_VERSION 0x0800
 #include <dinput.h>
 #include <stdlib.h>
 #include <Unknwn.h>
 #include <WinDef.h>
 #include <windows.h>
 #include <XInput.h>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/message_loop/message_loop.h"
 #include "base/scoped_native_library.h"
 #include "content/browser/gamepad/gamepad_data_fetcher.h"
 #include "content/browser/gamepad/gamepad_standard_mappings.h"
+#include "content/browser/gamepad/raw_input_data_fetcher_win.h"
 #include "third_party/WebKit/public/platform/WebGamepads.h"
 
 namespace content {
 
 class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
  public:
   GamepadPlatformDataFetcherWin();
   virtual ~GamepadPlatformDataFetcherWin();
   virtual void GetGamepadData(blink::WebGamepads* pads,
                               bool devices_changed_hint) OVERRIDE;
+  virtual void PauseHint(bool paused) OVERRIDE;
+
  private:
   // XInput-specific implementation for GetGamepadData.
   bool GetXInputGamepadData(blink::WebGamepads* pads,
                             bool devices_changed_hint);
   bool GetDirectInputGamepadData(blink::WebGamepads* pads,
                                  bool devices_changed_hint);
 
   // The three function types we use from xinput1_3.dll.
   typedef void (WINAPI *XInputEnableFunc)(BOOL enable);
   typedef DWORD (WINAPI *XInputGetCapabilitiesFunc)(
     DWORD dwUserIndex, DWORD dwFlags, XINPUT_CAPABILITIES* pCapabilities);
   typedef DWORD (WINAPI *XInputGetStateFunc)(
       DWORD dwUserIndex, XINPUT_STATE* pState);
 
   // Get functions from dynamically loaded xinput1_3.dll. We don't use
   // DELAYLOAD because the import library for Win8 SDK pulls xinput1_4 which
   // isn't redistributable. Returns true if loading was successful. We include
   // xinput1_3.dll with Chrome.
   bool GetXInputDllFunctions();
 
   // Scan for connected XInput and DirectInput gamepads.
   void EnumerateDevices(blink::WebGamepads* pads);
   bool GetXInputPadConnectivity(int i, blink::WebGamepad* pad) const;
 
   void GetXInputPadData(int i, blink::WebGamepad* pad);
   void GetDirectInputPadData(int i, blink::WebGamepad* pad);
+  void GetRawInputPadData(int i, blink::WebGamepad* pad);
 
   int FirstAvailableGamepadId() const;
   bool HasXInputGamepad(int index) const;
   bool HasDirectInputGamepad(const GUID &guid) const;
+  bool HasRawInputGamepad(const HANDLE handle) const;
 
   base::ScopedNativeLibrary xinput_dll_;
   bool xinput_available_;
   bool directinput_available_;
 
   // Function pointers to XInput functionality, retrieved in
   // |GetXinputDllFunctions|.
   XInputEnableFunc xinput_enable_;
   XInputGetCapabilitiesFunc xinput_get_capabilities_;
   XInputGetStateFunc xinput_get_state_;
 
   IDirectInput8* directinput_interface_;
 
   enum PadConnectionStatus {
     DISCONNECTED,
     XINPUT_CONNECTED,
-    DIRECTINPUT_CONNECTED
+    DIRECTINPUT_CONNECTED,
+    RAWINPUT_CONNECTED
   };
 
   struct PadState {
     PadConnectionStatus status;
-    int xinput_index;  // XInput-only.
-    // Fields below are for DirectInput devices only.
+    GamepadStandardMappingFunction mapper;
+
+    // XInput-only fields.
+    int xinput_index;
+    // DirectInput-only fields.
     GUID guid;
     IDirectInputDevice8* directinput_gamepad;
-    GamepadStandardMappingFunction mapper;
+    // RawInput-only fields.
+    HANDLE handle;
   };
   PadState pad_state_[blink::WebGamepads::itemsLengthCap];
+  blink::WebGamepads data_;

[scottmg, 2014/01/31 20:51:10]

i don't like storing this state here. does Raw need to maintain state between
updates? if so, can it go in the fetcher instead?

+
+  scoped_ptr<RawInputDataFetcher> raw_input_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherWin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_