Module: wine
Branch: master
Commit: 1ed3a815edc0edca2c077a1a2795414fca187cf7
URL: http://source.winehq.org/git/wine.git/?a=commit;h=1ed3a815edc0edca2c077a1a2…
Author: Vitaliy Margolen <wine-patches(a)kievinfo.com>
Date: Sun Nov 25 11:17:28 2007 -0700
dinput: Fix dead zone handling.
---
dlls/dinput/joystick_linuxinput.c | 25 ++++++++++++++++---------
1 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/dlls/dinput/joystick_linuxinput.c b/dlls/dinput/joystick_linuxinput.c
index 18417fb..13e413b 100644
--- a/dlls/dinput/joystick_linuxinput.c
+++ b/dlls/dinput/joystick_linuxinput.c
@@ -88,23 +88,30 @@ DWORD joystick_map_pov(POINTL *p)
/*
* This maps the read value (from the input event) to a value in the
* 'wanted' range.
+ * Notes:
+ * Dead zone is in % multiplied by a 100 (range 0..10000)
*/
LONG joystick_map_axis(ObjProps *props, int val)
{
LONG ret;
- LONG center = (props->lMax - props->lMin) / 2;
+ LONG dead_zone = MulDiv( props->lDeadZone, props->lDevMax - props->lDevMin, 10000 );
+ LONG dev_range = props->lDevMax - props->lDevMin - dead_zone;
- /* map the value from the hmin-hmax range into the wmin-wmax range */
- ret = MulDiv( val - props->lDevMin, props->lMax - props->lMin,
- props->lDevMax - props->lDevMin );
+ /* Center input */
+ val -= (props->lDevMin + props->lDevMax) / 2;
- if (abs( ret - center ) <= props->lDeadZone / 2 )
- ret = center;
+ /* Remove dead zone */
+ if (abs( val ) <= dead_zone / 2)
+ val = 0;
+ else
+ val = val < 0 ? val + dead_zone / 2 : val - dead_zone / 2;
- ret += props->lMin;
+ /* Scale and map the value from the device range into the required range */
+ ret = MulDiv( val, props->lMax - props->lMin, dev_range ) +
+ (props->lMin + props->lMax) / 2;
- TRACE( "(%d %d) -> (%d <%d> %d): val=%d ret=%d\n",
- props->lDevMin, props->lDevMax,
+ TRACE( "(%d <%d> %d) -> (%d <%d> %d): val=%d ret=%d\n",
+ props->lDevMin, dead_zone, props->lDevMax,
props->lMin, props->lDeadZone, props->lMax,
val, ret );