Android: Multi-Touch broken on Android 13 and certain Samsung Devices

[Ghabry]

This is reported alot and I found issues documenting it in the Lemuroid repository (an app supporting libretro cores that is not RetroArch ❤️ )

https://github.com/Swordfish90/Lemuroid

https://github.com/Swordfish90/Lemuroid/blob/96da5eddb8d2602adf8c82f57b34518e64a309c6/lemuroid-touchinput/src/main/java/com/swordfish/touchinput/radial/LemuroidTouchConfigs.kt#L131-L133

        // Using standard MotionEvents.getX/Y() is broken on Samsung devices running Android 11,
        // but Android 13 broke MotionEvents.getRawX/Y() events in landscape mode for every device.
        val useRawTouchCoordinates = Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU

Relevant issues:

• Lemuroid on Android 13 Swordfish90/Lemuroid#582
• Multi-touch broken in landscape mode after android 13 update  Swordfish90/Lemuroid#558
• Multi Touch is still broken in Samsung S22 Ultra Swordfish90/Lemuroid#620

[Ghabry]

The real issue here is btw dynamic resolution scaling by Samsung. They run games at lower resolutions by default to give higher performance and to not break the games they fake the X/y coordinates of touch events.
But ui components are not repositioned so all the calculations are off 🤦

[hsoftxl]

what is "btw dynamic resolution"?

what is "btw dynamic resolution"?

"btw" in that context means "By the way, "

The automatic resolution change is likely some sort of a battery optimization feature (besides performance) that could be disabled somewhere in settings. This is vendor specific and version specific, so can't tell where this is placed in devices.

[Ghabry]

This is not reproducible on a Samsung Galaxy A52 with Android 13.

Everything works fine.

Additionally got a report that Gamepads have a huge latency: Imo there is some noticable input lag that is not suitable for fast action games but RPGs are perfectly playable with it.

---

EDIT: Removed it from game booster and readded it. Now its broken.

[Ghabry]

Recording of the issue:

Single touch works, multi touch behaves... interesting.

Also notice at the end when "A" jumps to the finger position again because "B" is untouched first m(

rec-2023-05-22_15.45.01.mp4