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Only apply the jitter filter to prevent unexpected motion on axes that haven't been touched.

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This commit is contained in:
Sam Lantinga 2017-09-21 10:29:17 -07:00
parent 5ae90ef67a
commit eaab6098eb
1 changed files with 5 additions and 4 deletions
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5
src/joystick/SDL_joystick.c
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@ -661,7 +661,6 @@ int
SDL_PrivateJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value) SDL_PrivateJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)
{ {
int posted; int posted;
const int MAX_ALLOWED_JITTER = SDL_JOYSTICK_AXIS_MAX / 80; /* ShanWan PS3 controller needed 96 */
/* Make sure we're not getting garbage or duplicate events */ /* Make sure we're not getting garbage or duplicate events */
if (axis >= joystick->naxes) { if (axis >= joystick->naxes) {
@ -673,10 +672,12 @@ SDL_PrivateJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)
joystick->axes[axis].zero = value; joystick->axes[axis].zero = value;
joystick->axes[axis].has_initial_value = SDL_TRUE; joystick->axes[axis].has_initial_value = SDL_TRUE;
} }
if (!joystick->axes[axis].sent_initial_value) {
/* Make sure we don't send motion until there's real activity on this axis */
const int MAX_ALLOWED_JITTER = SDL_JOYSTICK_AXIS_MAX / 80; /* ShanWan PS3 controller needed 96 */
if (SDL_abs(value - joystick->axes[axis].value) <= MAX_ALLOWED_JITTER) { if (SDL_abs(value - joystick->axes[axis].value) <= MAX_ALLOWED_JITTER) {
return 0; return 0;
} }
if (!joystick->axes[axis].sent_initial_value) {
joystick->axes[axis].sent_initial_value = SDL_TRUE; joystick->axes[axis].sent_initial_value = SDL_TRUE;
joystick->axes[axis].value = value; /* Just so we pass the check above */ joystick->axes[axis].value = value; /* Just so we pass the check above */
SDL_PrivateJoystickAxis(joystick, axis, joystick->axes[axis].initial_value); SDL_PrivateJoystickAxis(joystick, axis, joystick->axes[axis].initial_value);