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Bug 5052 - Interval between SDL_SENSORUPDATE events for gyroscopes is too high
Summary: Interval between SDL_SENSORUPDATE events for gyroscopes is too high
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: events (show other bugs)
Version: 2.0.9
Hardware: ARM Android (All)
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-03-22 18:02 UTC by Andrei Kortunov
Modified: 2020-03-23 19:10 UTC (History)
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Description Andrei Kortunov 2020-03-22 18:02:28 UTC 
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).

For example, Unity3D has the Input.gyro.updateInterval attribute to control a gyroscope update interval. Is there a way to do something like that in SDL2?
Comment 1 Andrei Kortunov 2020-03-22 19:59:03 UTC 
In theory, the value can be controlled via ASensorEventQueue_setEventRate() function on Android, somewhere in the SDL_androidsensor.c:

ASensorEventQueue_setEventRate(hwdata->eventqueue, hwdata->asensor, desiredDelay);

It would be nice to have an optional argument for SDL_SensorOpen function to specify the update interval.

To get the minimum supported interval (SENSOR_DELAY_FASTEST), it is possible to use the ASensor_getMinDelay().
Comment 2 Sam Lantinga 2020-03-23 19:10:56 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/06adf174772e