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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).
This commit is contained in:
Sam Lantinga 2020-03-23 12:10:05 -07:00
parent 68c7e80dc5
commit 2c02b7410c
1 changed files with 9 additions and 1 deletions
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10
src/sensor/android/SDL_androidsensor.c
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@ -130,6 +130,7 @@ static int
SDL_ANDROID_SensorOpen(SDL_Sensor *sensor, int device_index) SDL_ANDROID_SensorOpen(SDL_Sensor *sensor, int device_index)
{ {
struct sensor_hwdata *hwdata; struct sensor_hwdata *hwdata;
int delay_us, min_delay_us;
hwdata = (struct sensor_hwdata *)SDL_calloc(1, sizeof(*hwdata)); hwdata = (struct sensor_hwdata *)SDL_calloc(1, sizeof(*hwdata));
if (hwdata == NULL) { if (hwdata == NULL) {
@ -149,7 +150,14 @@ SDL_ANDROID_SensorOpen(SDL_Sensor *sensor, int device_index)
return SDL_SetError("Couldn't enable sensor"); 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; sensor->hwdata = hwdata;
return 0; return 0;