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dinput: Fix dead zone handling.

This commit is contained in:
Vitaliy Margolen 2007-11-25 11:17:28 -07:00 committed by Alexandre Julliard
parent 3d5cc3b2e2
commit 1ed3a815ed
1 changed files with 16 additions and 9 deletions
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25
dlls/dinput/joystick_linuxinput.c
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@ -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 );