From 78146bb14c678c944618d35cae73e219d509b51a Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sun, 30 Nov 2025 11:35:36 -0800
Subject: [PATCH] Correct the sensor axis ordering with the Linux Nintendo
driver
Fixes https://github.com/libsdl-org/SDL/issues/14552
(cherry picked from commit 5e9163592fb90ee0a5121b9c9e9a1b168d5594ad)
---
src/joystick/linux/SDL_sysjoystick.c | 37 +++++++++++++++++++++++-----
1 file changed, 31 insertions(+), 6 deletions(-)
diff --git a/src/joystick/linux/SDL_sysjoystick.c b/src/joystick/linux/SDL_sysjoystick.c
index ea73821c064d2..7d936d4cf518d 100644
--- a/src/joystick/linux/SDL_sysjoystick.c
+++ b/src/joystick/linux/SDL_sysjoystick.c
@@ -150,6 +150,8 @@ typedef struct SDL_joylist_item
{
SDL_JoystickID device_instance;
char *path; // "/dev/input/event2" or whatever
+ Uint16 vendor;
+ Uint16 product;
char *name; // "SideWinder 3D Pro" or whatever
SDL_GUID guid;
dev_t devnum;
@@ -486,6 +488,8 @@ static void MaybeAddDevice(const char *path)
item->devnum = sb.st_rdev;
item->steam_virtual_gamepad_slot = -1;
item->path = SDL_strdup(path);
+ item->vendor = vendor;
+ item->product = product;
item->name = name;
item->guid = guid;
@@ -1844,6 +1848,20 @@ static void PollAllValues(Uint64 timestamp, SDL_Joystick *joystick)
// Joyballs are relative input, so there's no poll state. Events only!
}
+static void CorrectSensorData(struct joystick_hwdata *hwdata, float *values, float *data)
+{
+ if (hwdata->item->vendor == USB_VENDOR_NINTENDO) {
+ // The Nintendo driver uses a different axis order than SDL
+ data[0] = -values[1];
+ data[1] = values[2];
+ data[2] = -values[0];
+ } else {
+ data[0] = values[0];
+ data[1] = values[1];
+ data[2] = values[2];
+ }
+}
+
static void PollAllSensors(Uint64 timestamp, SDL_Joystick *joystick)
{
struct input_absinfo absinfo;
@@ -1854,27 +1872,31 @@ static void PollAllSensors(Uint64 timestamp, SDL_Joystick *joystick)
SDL_assert(joystick->hwdata->fd_sensor >= 0);
if (joystick->hwdata->has_gyro) {
- float data[3] = {0.0f, 0.0f, 0.0f};
+ float values[3] = {0.0f, 0.0f, 0.0f};
for (i = 0; i < 3; i++) {
if (ioctl(joystick->hwdata->fd_sensor, EVIOCGABS(ABS_RX + i), &absinfo) >= 0) {
- data[i] = absinfo.value * (SDL_PI_F / 180.f) / joystick->hwdata->gyro_scale[i];
+ values[i] = absinfo.value * (SDL_PI_F / 180.f) / joystick->hwdata->gyro_scale[i];
#ifdef DEBUG_INPUT_EVENTS
SDL_Log("Joystick : Re-read Gyro (axis %d) val= %f", i, data[i]);
#endif
}
}
+ float data[3];
+ CorrectSensorData(joystick->hwdata, values, data);
SDL_SendJoystickSensor(timestamp, joystick, SDL_SENSOR_GYRO, SDL_US_TO_NS(joystick->hwdata->sensor_tick), data, 3);
}
if (joystick->hwdata->has_accelerometer) {
- float data[3] = {0.0f, 0.0f, 0.0f};
+ float values[3] = {0.0f, 0.0f, 0.0f};
for (i = 0; i < 3; i++) {
if (ioctl(joystick->hwdata->fd_sensor, EVIOCGABS(ABS_X + i), &absinfo) >= 0) {
- data[i] = absinfo.value * SDL_STANDARD_GRAVITY / joystick->hwdata->accelerometer_scale[i];
+ values[i] = absinfo.value * SDL_STANDARD_GRAVITY / joystick->hwdata->accelerometer_scale[i];
#ifdef DEBUG_INPUT_EVENTS
SDL_Log("Joystick : Re-read Accelerometer (axis %d) val= %f", i, data[i]);
#endif
}
}
+ float data[3];
+ CorrectSensorData(joystick->hwdata, values, data);
SDL_SendJoystickSensor(timestamp, joystick, SDL_SENSOR_ACCEL, SDL_US_TO_NS(joystick->hwdata->sensor_tick), data, 3);
}
}
@@ -2058,12 +2080,15 @@ static void HandleInputEvents(SDL_Joystick *joystick)
PollAllSensors(SDL_GetTicksNS(), joystick); // try to sync up to current state now
} else {
Uint64 timestamp = SDL_EVDEV_GetEventTimestamp(event);
+ float data[3];
+ CorrectSensorData(joystick->hwdata, joystick->hwdata->gyro_data, data);
SDL_SendJoystickSensor(timestamp, joystick, SDL_SENSOR_GYRO,
SDL_US_TO_NS(joystick->hwdata->sensor_tick),
- joystick->hwdata->gyro_data, 3);
+ data, 3);
+ CorrectSensorData(joystick->hwdata, joystick->hwdata->accel_data, data);
SDL_SendJoystickSensor(timestamp, joystick, SDL_SENSOR_ACCEL,
SDL_US_TO_NS(joystick->hwdata->sensor_tick),
- joystick->hwdata->accel_data, 3);
+ data, 3);
}
break;
default: