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🧪 Test Builds: melonDS with Latency Improvements

Added 2025-10-03 21:33:48 +0000 UTC

Hey everyone!

I'm uploading experimental APKs of melonDS-Android with low-latency tweaks for you to test.

These builds explore two different strategies to improve input timing. Please try them both and let me know which feels smoother on your device.

MelonDSTestLatency BASE.apk - Base app, try this first!
MelonDSTestLatency v1.apk
- Focuses on refactoring input handling on the Android side:
  - Introduced TouchInputListener and restructured TouchscreenInputHandler to request unbuffered dispatch.
  - Motion history is routed through combined pressed-state callbacks to avoid redundant key toggles.
  - MelonTouchHandler now communicates with the native core using a unified setTouchState bridge, replacing separate press/release JNI calls.
MelonDSTestLatency v2.apk
- Implements a native lock-free touchscreen queue, input resampling, short-horizon prediction, and host frame latching.
- Optimizes the JNI bridge and thread handling, modeled after native pipelines in downstream emulator builds.
- Normalizes MotionEvent history and routes stylus preference through TouchSample, with Choreographer frame times forwarded to native code for improved sync.

These aren’t final, your testing and input will directly influence what makes it into the next stable release.

Does one version feel noticeably more responsive?
Any input bugs or dropped touches?
Try them on different games or devices (especially if you're using a stylus or low-latency display).
Let me know your device model + Android version when reporting!

Thanks so much for testing these cutting-edge builds, your feedback will directly influence what makes it into the next public release.

—Sapphire