Ignore axis jitter when mapping controllers
diff --git a/test/controllermap.c b/test/controllermap.c
index 0f7de70..34fc133 100644
--- a/test/controllermap.c
+++ b/test/controllermap.c
@@ -143,6 +143,7 @@ static SDL_GameControllerExtendedBind s_arrBindings[BINDING_COUNT];
typedef struct
{
SDL_bool m_bMoving;
+ int m_nLastValue;
int m_nStartingValue;
int m_nFarthestValue;
} AxisState;
@@ -461,14 +462,20 @@ WatchJoystick(SDL_Joystick * joystick)
break;
case SDL_JOYAXISMOTION:
if (event.jaxis.which == nJoystickID) {
+ const int MAX_ALLOWED_JITTER = SDL_JOYSTICK_AXIS_MAX / 80; /* ShanWan PS3 controller needed 96 */
AxisState *pAxisState = &s_arrAxisState[event.jaxis.axis];
int nValue = event.jaxis.value;
int nCurrentDistance, nFarthestDistance;
if (!pAxisState->m_bMoving) {
Sint16 nInitialValue;
pAxisState->m_bMoving = SDL_JoystickGetAxisInitialState(joystick, event.jaxis.axis, &nInitialValue);
+ pAxisState->m_nLastValue = nInitialValue;
pAxisState->m_nStartingValue = nInitialValue;
pAxisState->m_nFarthestValue = nInitialValue;
+ } else if (SDL_abs(nValue - pAxisState->m_nLastValue) <= MAX_ALLOWED_JITTER) {
+ break;
+ } else {
+ pAxisState->m_nLastValue = nValue;
}
nCurrentDistance = SDL_abs(nValue - pAxisState->m_nStartingValue);
nFarthestDistance = SDL_abs(pAxisState->m_nFarthestValue - pAxisState->m_nStartingValue);