From d8ecb804f3659a04ad4203b4b11fef30b274b9d5 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Thu, 21 Jun 2007 22:51:47 +0000
Subject: Add a joystick dead zone for joysticks that don't have them.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 924
---
 src/i_joystick.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/i_joystick.c b/src/i_joystick.c
index b6333334..06d3679b 100644
--- a/src/i_joystick.c
+++ b/src/i_joystick.c
@@ -37,6 +37,11 @@
 #include "d_main.h"
 #include "i_joystick.h"
 
+// When an axis is within the dead zone, it is set to zero.
+// This is 5% of the full range:
+
+#define DEAD_ZONE (32768 / 20)
+
 static SDL_Joystick *joystick = NULL;
 
 // Configuration variables:
@@ -158,6 +163,11 @@ static int GetAxisState(int axis, int invert)
         result = -result;
     }
 
+    if (result < DEAD_ZONE && result > -DEAD_ZONE)
+    {
+        result = 0;
+    }
+
     return result;
 }
 
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