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Look at direction of analog axis travel instead of instantaneous sample (#5509) 

* Look at direction of analog axis travel instead of instantaneous sample

* Clang-format

* Use map count, use unordered_map

* Improve digital vs. true analog axis heuristics
This commit is contained in:
xperia64 2021-01-03 02:09:26 +00:00 committed by GitHub
parent 9c76120a13
commit 755393da90
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 44 additions and 1 deletions
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45
src/input_common/sdl/sdl_impl.cpp
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@ -904,8 +904,41 @@ public:
while (state.event_queue.Pop(event)) {
switch (event.type) {
case SDL_JOYAXISMOTION:
if (std::abs(event.jaxis.value / 32767.0) < 0.5) {
if (!axis_memory.count(event.jaxis.which) ||
!axis_memory[event.jaxis.which].count(event.jaxis.axis)) {
axis_memory[event.jaxis.which][event.jaxis.axis] = event.jaxis.value;
axis_event_count[event.jaxis.which][event.jaxis.axis] = 1;
break;
} else {
axis_event_count[event.jaxis.which][event.jaxis.axis]++;
// The joystick and axis exist in our map if we take this branch, so no checks
// needed
if (std::abs(
(event.jaxis.value - axis_memory[event.jaxis.which][event.jaxis.axis]) /
32767.0) < 0.5) {
break;
} else {
if (axis_event_count[event.jaxis.which][event.jaxis.axis] == 2 &&
IsAxisAtPole(event.jaxis.value) &&
IsAxisAtPole(axis_memory[event.jaxis.which][event.jaxis.axis])) {
// If we have exactly two events and both are near a pole, this is
// likely a digital input masquerading as an analog axis; Instead of
// trying to look at the direction the axis travelled, assume the first
// event was press and the second was release; This should handle most
// digital axes while deferring to the direction of travel for analog
// axes
event.jaxis.value = std::copysign(
32767, axis_memory[event.jaxis.which][event.jaxis.axis]);
} else {
// There are more than two events, so this is likely a true analog axis,
// check the direction it travelled
event.jaxis.value = std::copysign(
32767, event.jaxis.value -
axis_memory[event.jaxis.which][event.jaxis.axis]);
}
axis_memory.clear();
axis_event_count.clear();
}
}
case SDL_JOYBUTTONUP:
case SDL_JOYHATMOTION:
@ -914,6 +947,16 @@ public:
}
return {};
}
private:
// Determine whether an axis value is close to an extreme or center
// Some controllers have a digital D-Pad as a pair of analog sticks, with 3 possible values per
// axis, which is why the center must be considered a pole
bool IsAxisAtPole(int16_t value) {
return std::abs(value) >= 32767 || std::abs(value) < 327;
}
std::unordered_map<SDL_JoystickID, std::unordered_map<uint8_t, int16_t>> axis_memory;
std::unordered_map<SDL_JoystickID, std::unordered_map<uint8_t, uint32_t>> axis_event_count;
};
class SDLAnalogPoller final : public SDLPoller {