1 files changed, 18 insertions, 0 deletions
diff --git a/src/i_joystick.h b/src/i_joystick.h
index 93895de7..7c28eb6c 100644
--- a/src/i_joystick.h
+++ b/src/i_joystick.h
@@ -45,6 +45,24 @@
 // Create a button axis value from two button values.
 #define CREATE_BUTTON_AXIS(neg, pos) (BUTTON_AXIS | (neg) | ((pos) << 8))
 
+// If this bit is set in an axis value, the axis is not actually a
+// joystick axis, but is a "hat" axis. This means that we read (one of)
+// the hats on the joystick.
+#define HAT_AXIS    0x20000
+
+#define IS_HAT_AXIS(axis) ((axis) >= 0 && ((axis) & HAT_AXIS) != 0)
+
+// Get the hat number from a hat axis value.
+#define HAT_AXIS_HAT(axis)         ((axis) & 0xff)
+// Which axis of the hat? (horizonal or vertical)
+#define HAT_AXIS_DIRECTION(axis)   (((axis) >> 8) & 0xff)
+
+#define CREATE_HAT_AXIS(hat, direction) \
+    (HAT_AXIS | (hat) | ((direction) << 8))
+
+#define HAT_AXIS_HORIZONTAL 1
+#define HAT_AXIS_VERTICAL   2
+
 void I_InitJoystick(void);
 void I_ShutdownJoystick(void);
 void I_UpdateJoystick(void);