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workaround for analogue trigger configuration - eg with xpad.

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Unlike other axis, they don't default to 0, but instead start at -32768 and go to +32767 when pressed. This confuses the
current ES code axis code. As a workaround, we get the initial value and if it is -32767, we add 32767 and divide by two. This gives it
a range that can be handled with the current code (from 0 to 32767). Note on my X11 machine, I had to plug the joystick in after ES
was loaded or it get 0 as the initial axis value for the triggers. This seems ok on the RPI though, so possible some SDL issue.

With this change on a 360 controller the triggers should be correctly detected as +2 and +5 without seeing two presses for each trigger press.
This commit is contained in:
Jools Wills 2016-08-13 01:40:50 +01:00
parent fa513e4c2d
commit c5b74947a0
2 changed files with 20 additions and 5 deletions
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24
es-core/src/InputManager.cpp
View file

@ -89,7 +89,14 @@ void InputManager::addJoystickByDeviceIndex(int id)
// set up the prevAxisValues
int numAxes = SDL_JoystickNumAxes(joy);
mPrevAxisValues[joyId] = new int[numAxes];
std::fill(mPrevAxisValues[joyId], mPrevAxisValues[joyId] + numAxes, 0); //initialize array to 0
mInitAxisValues[joyId] = new int[numAxes];
int axis;
for (int i = 0; i< numAxes; i++) {
axis = SDL_JoystickGetAxis(joy, i);
mInitAxisValues[joyId][i] = axis;
mPrevAxisValues[joyId][i] = axis;
}
}
void InputManager::removeJoystickByJoystickID(SDL_JoystickID joyId)
@ -170,21 +177,28 @@ InputConfig* InputManager::getInputConfigByDevice(int device)
bool InputManager::parseEvent(const SDL_Event& ev, Window* window)
{
bool causedEvent = false;
int axis;
int deadzone = DEADZONE;
switch(ev.type)
{
case SDL_JOYAXISMOTION:
axis = ev.jaxis.value;
if (mInitAxisValues[ev.jaxis.which][ev.jaxis.axis] == -32768)
{
deadzone /= 2;
axis = (axis + 32767) / 2;
}
//if it switched boundaries
if((abs(ev.jaxis.value) > DEADZONE) != (abs(mPrevAxisValues[ev.jaxis.which][ev.jaxis.axis]) > DEADZONE))
if((abs(axis) > deadzone) != (abs(mPrevAxisValues[ev.jaxis.which][ev.jaxis.axis]) > deadzone))
{
int normValue;
if(abs(ev.jaxis.value) <= DEADZONE)
if(abs(axis) <= deadzone)
normValue = 0;
else
if(ev.jaxis.value > 0)
if(axis > 0)
normValue = 1;
else
normValue = -1;
window->input(getInputConfigByDevice(ev.jaxis.which), Input(ev.jaxis.which, TYPE_AXIS, ev.jaxis.axis, normValue, false));
causedEvent = true;
}

1
es-core/src/InputManager.h
View file

@ -26,6 +26,7 @@ private:
InputConfig* mKeyboardInputConfig;
std::map<SDL_JoystickID, int*> mPrevAxisValues;
std::map<SDL_JoystickID, int*> mInitAxisValues;
bool initialized() const;