1 files changed, 203 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/sensor/n3ds/SDL_n3dssensor.c b/contrib/SDL-3.2.8/src/sensor/n3ds/SDL_n3dssensor.c
new file mode 100644
index 0000000..ac36e70
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/sensor/n3ds/SDL_n3dssensor.c
@@ -0,0 +1,203 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "SDL_internal.h"
+
+#ifdef SDL_SENSOR_N3DS
+
+#include <3ds.h>
+
+#include "../SDL_syssensor.h"
+
+// 1 accelerometer and 1 gyroscope
+#define N3DS_SENSOR_COUNT 2
+
+typedef struct
+{
+    SDL_SensorType type;
+    SDL_SensorID instance_id;
+} SDL_N3DSSensor;
+
+static SDL_N3DSSensor N3DS_sensors[N3DS_SENSOR_COUNT];
+
+static bool InitN3DSServices(void);
+static void UpdateN3DSAccelerometer(SDL_Sensor *sensor);
+static void UpdateN3DSGyroscope(SDL_Sensor *sensor);
+
+static bool IsDeviceIndexValid(int device_index)
+{
+    return device_index >= 0 && device_index < N3DS_SENSOR_COUNT;
+}
+
+static bool N3DS_SensorInit(void)
+{
+    if (!InitN3DSServices()) {
+        return SDL_SetError("Failed to initialise N3DS services");
+    }
+
+    N3DS_sensors[0].type = SDL_SENSOR_ACCEL;
+    N3DS_sensors[0].instance_id = SDL_GetNextObjectID();
+    N3DS_sensors[1].type = SDL_SENSOR_GYRO;
+    N3DS_sensors[1].instance_id = SDL_GetNextObjectID();
+    return true;
+}
+
+static bool InitN3DSServices(void)
+{
+    if (R_FAILED(hidInit())) {
+        return false;
+    }
+
+    if (R_FAILED(HIDUSER_EnableAccelerometer())) {
+        return false;
+    }
+
+    if (R_FAILED(HIDUSER_EnableGyroscope())) {
+        return false;
+    }
+    return true;
+}
+
+static int N3DS_SensorGetCount(void)
+{
+    return N3DS_SENSOR_COUNT;
+}
+
+static void N3DS_SensorDetect(void)
+{
+}
+
+static const char *N3DS_SensorGetDeviceName(int device_index)
+{
+    if (IsDeviceIndexValid(device_index)) {
+        switch (N3DS_sensors[device_index].type) {
+        case SDL_SENSOR_ACCEL:
+            return "Accelerometer";
+        case SDL_SENSOR_GYRO:
+            return "Gyroscope";
+        default:
+            return "Unknown";
+        }
+    }
+
+    return NULL;
+}
+
+static SDL_SensorType N3DS_SensorGetDeviceType(int device_index)
+{
+    if (IsDeviceIndexValid(device_index)) {
+        return N3DS_sensors[device_index].type;
+    }
+    return SDL_SENSOR_INVALID;
+}
+
+static int N3DS_SensorGetDeviceNonPortableType(int device_index)
+{
+    return (int)N3DS_SensorGetDeviceType(device_index);
+}
+
+static SDL_SensorID N3DS_SensorGetDeviceInstanceID(int device_index)
+{
+    if (IsDeviceIndexValid(device_index)) {
+        return N3DS_sensors[device_index].instance_id;
+    }
+    return -1;
+}
+
+static bool N3DS_SensorOpen(SDL_Sensor *sensor, int device_index)
+{
+    return true;
+}
+
+static void N3DS_SensorUpdate(SDL_Sensor *sensor)
+{
+    switch (sensor->type) {
+    case SDL_SENSOR_ACCEL:
+        UpdateN3DSAccelerometer(sensor);
+        break;
+    case SDL_SENSOR_GYRO:
+        UpdateN3DSGyroscope(sensor);
+        break;
+    default:
+        break;
+    }
+}
+
+static void UpdateN3DSAccelerometer(SDL_Sensor *sensor)
+{
+    static accelVector previous_state = { 0, 0, 0 };
+    accelVector current_state;
+    float data[3];
+    Uint64 timestamp = SDL_GetTicksNS();
+
+    hidAccelRead(&current_state);
+    if (SDL_memcmp(&previous_state, &current_state, sizeof(accelVector)) != 0) {
+        SDL_memcpy(&previous_state, &current_state, sizeof(accelVector));
+        data[0] = (float)current_state.x * SDL_STANDARD_GRAVITY;
+        data[1] = (float)current_state.y * SDL_STANDARD_GRAVITY;
+        data[2] = (float)current_state.z * SDL_STANDARD_GRAVITY;
+        SDL_SendSensorUpdate(timestamp, sensor, timestamp, data, sizeof(data));
+    }
+}
+
+static void UpdateN3DSGyroscope(SDL_Sensor *sensor)
+{
+    static angularRate previous_state = { 0, 0, 0 };
+    angularRate current_state;
+    float data[3];
+    Uint64 timestamp = SDL_GetTicksNS();
+
+    hidGyroRead(&current_state);
+    if (SDL_memcmp(&previous_state, &current_state, sizeof(angularRate)) != 0) {
+        SDL_memcpy(&previous_state, &current_state, sizeof(angularRate));
+        data[0] = (float)current_state.x;
+        data[1] = (float)current_state.y;
+        data[2] = (float)current_state.z;
+        SDL_SendSensorUpdate(timestamp, sensor, timestamp, data, sizeof(data));
+    }
+}
+
+static void N3DS_SensorClose(SDL_Sensor *sensor)
+{
+}
+
+static void N3DS_SensorQuit(void)
+{
+    HIDUSER_DisableGyroscope();
+    HIDUSER_DisableAccelerometer();
+    hidExit();
+}
+
+SDL_SensorDriver SDL_N3DS_SensorDriver = {
+    .Init = N3DS_SensorInit,
+    .GetCount = N3DS_SensorGetCount,
+    .Detect = N3DS_SensorDetect,
+    .GetDeviceName = N3DS_SensorGetDeviceName,
+    .GetDeviceType = N3DS_SensorGetDeviceType,
+    .GetDeviceNonPortableType = N3DS_SensorGetDeviceNonPortableType,
+    .GetDeviceInstanceID = N3DS_SensorGetDeviceInstanceID,
+    .Open = N3DS_SensorOpen,
+    .Update = N3DS_SensorUpdate,
+    .Close = N3DS_SensorClose,
+    .Quit = N3DS_SensorQuit,
+};
+
+#endif // SDL_SENSOR_N3DS