Support DirectInput gamepads 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/scoped_native_library.h"
 #include "content/browser/gamepad/gamepad_data_fetcher.h"
+#include "content/browser/gamepad/gamepad_standard_mappings.h"
+
+// struct DIDEVICEINSTANCE;
+// struct IDirectInput8;
+//struct IDirectInputDevice8;

[scottmg, 2013/02/13 19:19:07]

nit: delete these

+namespace WebKit {
+class WebGamepad;
+}
 
 namespace content {
 
 class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
  public:
   GamepadPlatformDataFetcherWin();
   virtual ~GamepadPlatformDataFetcherWin();
   virtual void GetGamepadData(WebKit::WebGamepads* pads,
                               bool devices_changed_hint) OVERRIDE;
  private:
+  // XInput-specific implementation for GetGamepadData.
+  bool GetXInputGamepadData(WebKit::WebGamepads* pads,
+                            bool devices_changed_hint);
+  bool GetDirectInputGamepadData(WebKit::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();
+  bool GetXInputDllFunctions();
+
+  bool GetDirectInputDllFunctions();
+
+  // Scan for connected XInput and DirectInput gamepads.
+  void EnumerateDevices(WebKit::WebGamepads* pads);
+  bool GetXInputPadConnectivity(int i, WebKit::WebGamepad* pad) const;
+
+  void GetXInputPadData(int i, WebKit::WebGamepad* pad);
+  void GetDirectInputPadData(int i, WebKit::WebGamepad* pad);
 
   base::ScopedNativeLibrary xinput_dll_;
   bool xinput_available_;
 
   // Function pointers to XInput functionality, retrieved in
   // |GetXinputDllFunctions|.
   XInputEnableFunc xinput_enable_;
   XInputGetCapabilitiesFunc xinput_get_capabilities_;
   XInputGetStateFunc xinput_get_state_;
 
+  std::vector<uint32> xinput_devices_;
+  typedef HRESULT (WINAPI *DirectInputCreateFunc)(HINSTANCE hinst,
+                                                  DWORD dwVersion,
+                                                  const IID& riidltf,
+                                                  void** ppvOut,
+                                                  IUnknown* punkOuter);
+  DirectInputCreateFunc directinput_create_;
+  base::ScopedNativeLibrary directinput_dll_;
+  bool directinput_available_;
+  IDirectInput8* directinput_interface_;
+
+  enum PadConnectionStatus {
+    DISCONNECTED,
+    XINPUT_CONNECTED,
+    DIRECTINPUT_CONNECTED
+  };
+
+  struct PadState {
+    PadConnectionStatus status;
+    // Fields below are for DirectInput devices only.
+    IDirectInputDevice8* directinput_gamepad;
+    GamepadStandardMappingFunction mapper;
+  };
+  std::vector<PadState> pad_state_;
+
   DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherWin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_