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Reworked deadzone algorithm

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abcpea 2026-01-13 15:45:25 +11:00
parent 5f512205e4
commit 9f9ec5d754
1 changed files with 9 additions and 10 deletions
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19
src/pc/controller/controller_sdl2.c
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@ -176,25 +176,24 @@ static inline void update_button(const int i, const bool new) {
}
}
static inline void update_analog_stick(s8 *stick_x, s8 *stick_y,
static inline void update_analog_stick(s8 *stick_x, s8 *stick_y,
int16_t input_x, int16_t input_y) {
static const float FSHRT_MAX = 32768.f;
uint32_t magnitude_sq = (uint32_t)(input_x * input_x) + (uint32_t)(input_y * input_y);
uint32_t stickDeadzoneActual = configStickDeadzone * DEADZONE_STEP;
if (magnitude_sq > (uint32_t)(stickDeadzoneActual * stickDeadzoneActual)) {
uint32_t magnitude = sqrt(magnitude_sq);
float stickDeadzoneScale = FSHRT_MAX / (FSHRT_MAX - stickDeadzoneActual);
float magnitude = sqrt(magnitude_sq);
float dir_x = (float)input_x / magnitude;
float dir_y = (float)input_y / magnitude;
float dir_sum = fabsf(dir_x) + fabsf(dir_y);
float scale = 1.f / (fabs(dir_x) >= fabs(dir_y) ? fabs(dir_x) : fabs(dir_y));
float deadzone = stickDeadzoneActual / (FSHRT_MAX);
magnitude -= stickDeadzoneActual;
magnitude *= stickDeadzoneScale;
if (dir_sum >= 1)
magnitude /= (dir_sum);
magnitude /= 0x100;
magnitude /= FSHRT_MAX;
magnitude = scale * (magnitude - deadzone);
magnitude /= scale - deadzone;
magnitude *= 127;
magnitude = magnitude >= 127 ? 127 : magnitude;
*stick_x = dir_x * magnitude;