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Fixed mapping controllers that have axes that start at -32768 and then snap to 0 at the first input report

This commit is contained in:
Sam Lantinga 2019-11-28 11:44:15 -08:00
parent a3a8fcef77
commit 8aaf945b2f
3 changed files with 25 additions and 24 deletions
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34
src/joystick/SDL_joystick.c
View File

@ -833,43 +833,49 @@ int
SDL_PrivateJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)
{
int posted;
SDL_JoystickAxisInfo *info;
/* Make sure we're not getting garbage or duplicate events */
if (axis >= joystick->naxes) {
return 0;
}
if (!joystick->axes[axis].has_initial_value) {
joystick->axes[axis].initial_value = value;
joystick->axes[axis].value = value;
joystick->axes[axis].zero = value;
joystick->axes[axis].has_initial_value = SDL_TRUE;
info = &joystick->axes[axis];
if (!info->has_initial_value ||
(!info->has_second_value && info->initial_value == -32768 && value == 0)) {
info->initial_value = value;
info->value = value;
info->zero = value;
info->has_initial_value = SDL_TRUE;
} else {
info->has_second_value = SDL_TRUE;
}
if (value == joystick->axes[axis].value) {
if (value == info->value) {
return 0;
}
if (!joystick->axes[axis].sent_initial_value) {
if (!info->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 - info->value) <= MAX_ALLOWED_JITTER) {
return 0;
}
joystick->axes[axis].sent_initial_value = SDL_TRUE;
joystick->axes[axis].value = value; /* Just so we pass the check above */
SDL_PrivateJoystickAxis(joystick, axis, joystick->axes[axis].initial_value);
info->sent_initial_value = SDL_TRUE;
info->value = value; /* Just so we pass the check above */
SDL_PrivateJoystickAxis(joystick, axis, info->initial_value);
}
/* We ignore events if we don't have keyboard focus, except for centering
* events.
*/
if (SDL_PrivateJoystickShouldIgnoreEvent()) {
if ((value > joystick->axes[axis].zero && value >= joystick->axes[axis].value) ||
(value < joystick->axes[axis].zero && value <= joystick->axes[axis].value)) {
if ((value > info->zero && value >= info->value) ||
(value < info->zero && value <= info->value)) {
return 0;
}
}
/* Update internal joystick state */
joystick->axes[axis].value = value;
info->value = value;
/* Post the event, if desired */
posted = 0;

1
src/joystick/SDL_sysjoystick.h
View File

@ -35,6 +35,7 @@ typedef struct _SDL_JoystickAxisInfo
Sint16 value; /* Current axis state */
Sint16 zero; /* Zero point on the axis (-32768 for triggers) */
SDL_bool has_initial_value; /* Whether we've seen a value on the axis yet */
SDL_bool has_second_value; /* Whether we've seen a second value on the axis yet */
SDL_bool sent_initial_value; /* Whether we've sent the initial axis value */
} SDL_JoystickAxisInfo;

14
test/controllermap.c
View File

@ -413,13 +413,6 @@ WatchJoystick(SDL_Joystick * joystick)
s_nNumAxes = SDL_JoystickNumAxes(joystick);
s_arrAxisState = (AxisState *)SDL_calloc(s_nNumAxes, sizeof(*s_arrAxisState));
for (iIndex = 0; iIndex < s_nNumAxes; ++iIndex) {
AxisState *pAxisState = &s_arrAxisState[iIndex];
Sint16 nInitialValue;
pAxisState->m_bMoving = SDL_JoystickGetAxisInitialState(joystick, iIndex, &nInitialValue);
pAxisState->m_nStartingValue = nInitialValue;
pAxisState->m_nFarthestValue = nInitialValue;
}
/* Loop, getting joystick events! */
while (!done && !s_bBindingComplete) {
@ -472,9 +465,10 @@ WatchJoystick(SDL_Joystick * joystick)
int nValue = event.jaxis.value;
int nCurrentDistance, nFarthestDistance;
if (!pAxisState->m_bMoving) {
pAxisState->m_bMoving = SDL_TRUE;
pAxisState->m_nStartingValue = nValue;
pAxisState->m_nFarthestValue = nValue;
Sint16 nInitialValue;
pAxisState->m_bMoving = SDL_JoystickGetAxisInitialState(joystick, event.jaxis.axis, &nInitialValue);
pAxisState->m_nStartingValue = nInitialValue;
pAxisState->m_nFarthestValue = nInitialValue;
}
nCurrentDistance = SDL_abs(nValue - pAxisState->m_nStartingValue);
nFarthestDistance = SDL_abs(pAxisState->m_nFarthestValue - pAxisState->m_nStartingValue);