Commit 2c02b7410cefdf1602c2ad953541bfa62458bb42
2020-03-23T12:10:05
Fixed bug 5052 - Interval between SDL_SENSORUPDATE events for gyroscopes is too high Andrei Kortunov Hello. I try to implement an application for Android, which uses a new sensors API from 2.0.9 to control a camera rotation via built-in gyroscope, using the code from the test/testsensor.c as an example. Gyroscope input itself works well, but an interval between SDL_SENSORUPDATE events is about 200ms (the SENSOR_DELAY_NORMAL, I believe), when I need the interval about 20-40ms (the SENSOR_DELAY_GAME or SENSOR_DELAY_FASTEST).
diff --git a/src/sensor/android/SDL_androidsensor.c b/src/sensor/android/SDL_androidsensor.c
index d7c0a7e..165eb9b 100644
--- a/src/sensor/android/SDL_androidsensor.c
+++ b/src/sensor/android/SDL_androidsensor.c
@@ -130,6 +130,7 @@ static int
SDL_ANDROID_SensorOpen(SDL_Sensor *sensor, int device_index)
{
struct sensor_hwdata *hwdata;
+ int delay_us, min_delay_us;
hwdata = (struct sensor_hwdata *)SDL_calloc(1, sizeof(*hwdata));
if (hwdata == NULL) {
@@ -149,7 +150,14 @@ SDL_ANDROID_SensorOpen(SDL_Sensor *sensor, int device_index)
return SDL_SetError("Couldn't enable sensor");
}
- /* FIXME: What rate should we set for this sensor? 60 FPS? Let's try the default rate for now... */
+ /* Use 60 Hz update rate if possible */
+ /* FIXME: Maybe add a hint for this? */
+ delay_us = 1000000 / 60;
+ min_delay_us = ASensor_getMinDelay(hwdata->asensor);
+ if (delay_us < min_delay_us) {
+ delay_us = min_delay_us;
+ }
+ ASensorEventQueue_setEventRate(hwdata->eventqueue, hwdata->asensor, delay_us);
sensor->hwdata = hwdata;
return 0;