split this up

Fix losing keyboard input when changing graphics settings (this happened
with the old code, too).

stepmania/src/arch/InputHandler/InputHandler_DirectInputHelper.h

@@ -0,0 +1,41 @@
+#ifndef INPUTHANDLER_DIRECTINPUT_HELPER_H
+#define INPUTHANDLER_DIRECTINPUT_HELPER_H
+
+#include "InputFilter.h"
+
+#define DIRECTINPUT_VERSION 0x0500
+#include <dinput.h>
+extern LPDIRECTINPUT dinput;
+
+#define INPUT_QSIZE	32
+
+typedef struct input_t
+{
+	/* DirectInput offset for this input type: */
+	DWORD ofs;
+
+	/* Button, axis or hat: */
+	enum Type { KEY, BUTTON, AXIS, HAT } type;
+
+	int num;
+} input_t;
+
+struct DIDevice
+{
+	DIDEVICEINSTANCE JoystickInst;
+	LPDIRECTINPUTDEVICE2 Device;
+
+	enum { KEYBOARD, JOYSTICK } type;
+
+	bool buffered;
+	int buttons, axes, hats;
+	vector<input_t> Inputs;
+	InputDevice dev;
+	
+	DIDevice();
+
+	bool Open();
+	void Close();
+};
+
+#endif