Reworking of joystick support :

- Joystick type now selectable
- Added emulation of standard joysticks with up to 8 buttons
- Added emulation of Microsoft Sidewinder pads
- Host->emulated joystick button & axis mapping now configurable (only on Windows atm)
- Gameport registers now take 1us to access - helps Sidewinder drivers

src/gameport.h

@@ -1,2 +1,29 @@
 extern device_t gameport_device;
 extern device_t gameport_201_device;
+
+typedef struct
+{
+        char name[80];
+        void *(*init)();
+        void (*close)(void *p);
+        uint8_t (*read)(void *p);
+        void (*write)(void *p);
+        int (*read_axis)(void *p, int axis);
+        void (*a0_over)(void *p);
+        int axis_count, button_count;
+        int max_joysticks;
+        char axis_names[8][32];
+        char button_names[32][32];
+} joystick_if_t;
+
+extern int joystick_type;
+char *joystick_get_name(int joystick);
+int joystick_get_max_joysticks(int joystick);
+int joystick_get_axis_count(int joystick);
+int joystick_get_button_count(int joystick);
+char *joystick_get_axis_name(int joystick, int id);
+char *joystick_get_button_name(int joystick, int id);
+
+void gameport_update_joystick_type();
+
+#define AXIS_NOT_PRESENT -99999