Support DirectInput gamepads on Windows.

content/browser/gamepad/gamepad_platform_data_fetcher_win.h

Index: content/browser/gamepad/gamepad_platform_data_fetcher_win.h
diff --git a/content/browser/gamepad/gamepad_platform_data_fetcher_win.h b/content/browser/gamepad/gamepad_platform_data_fetcher_win.h
index 92c44ffc4a3d7a815c9f75397bf79b9d9f65f6f3..59e9d791e0edf76192b6e79d07d51eacd1735d75 100644
--- a/content/browser/gamepad/gamepad_platform_data_fetcher_win.h
+++ b/content/browser/gamepad/gamepad_platform_data_fetcher_win.h
@@ -10,6 +10,11 @@
 #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>
 
@@ -17,6 +22,11 @@
 #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"
+
+namespace WebKit {
+class WebGamepad;
+}
 
 namespace content {
 
@@ -27,6 +37,12 @@ class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
   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)(
@@ -38,10 +54,18 @@ class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
   // 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();
+
+  // 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_;
+  bool directinput_available_;
 
   // Function pointers to XInput functionality, retrieved in
   // |GetXinputDllFunctions|.
@@ -49,6 +73,22 @@ class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
   XInputGetCapabilitiesFunc xinput_get_capabilities_;
   XInputGetStateFunc xinput_get_state_;
 
+  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);
 };