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Bug 5052

Summary: Interval between SDL_SENSORUPDATE events for gyroscopes is too high
Product: SDL Reporter: Andrei Kortunov <andrei.kortunov>
Component: eventsAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.9   
Hardware: ARM   
OS: Android (All)   

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