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fixed trigger axes formula: data * 257 - 32768 (same as PS4)

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walle
2026-02-09 21:13:18 +08:00
committed by Sam Lantinga
parent 226057601f
commit 6f1aa78e04
1 changed files with 6 additions and 6 deletions
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12
src/joystick/hidapi/SDL_hidapi_gamesir.c
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@@ -696,17 +696,17 @@ static void HIDAPI_DriverGameSir_HandleStatePacket(SDL_Joystick *joystick, SDL_D
}
// Handle trigger axes
// Protocol: L2 (payload byte 12) - analog left trigger 0-255, 0 = released, 255 = pressed
// R2 (payload byte 13) - analog right trigger 0-255, 0 = released, 255 = pressed
// SDL range: 0-32767 (0 = released, 32767 = fully pressed)
// Linear mapping: 0-255 -> 0-32767
// Protocol: L2 (payload byte 12) - analog left trigger 0-255, 0 = released, 255 = fully pressed
// R2 (payload byte 13) - analog right trigger 0-255, 0 = released, 255 = fully pressed
// SDL range: -32768 to 32767 (-32768 = released, 32767 = fully pressed)
// Linear mapping: 0-255 -> -32768..32767, formula: data * 257 - 32768 (same as PS4)
if (last[12] != data[12]) {
axis = (Sint16)(((int)data[12] * 255) - 32767);
axis = ((int)data[12] * 257) - 32768;
SDL_SendJoystickAxis(timestamp, joystick, SDL_GAMEPAD_AXIS_LEFT_TRIGGER, axis);
}
if (last[13] != data[13]) {
axis = (Sint16)(((int)data[13] * 255) - 32767);
axis = ((int)data[13] * 257) - 32768;
SDL_SendJoystickAxis(timestamp, joystick, SDL_GAMEPAD_AXIS_RIGHT_TRIGGER, axis);
}
}