Cemu for Android External Screen Support

⚠️ Disclaimer

External screen support is currently experimental and intended as a proof of concept.
There are known bugs and limitations, and stability is not guaranteed.

This feature will be gradually improved in future versions, with the goal of delivering a more polished dual-screen experience on Android.

Tested and verified on the Ayaneo Pocket DS for external display functionality.

Changes in this version

Add support for rendering GamePad to external display

• Allows toggling the GamePad screen to an external display.
• Introduces a PadPresentation using DisplayManager and DisplayListener.
• Lifecycle-aware handling of connected/disconnected displays.
• Side menu updated with a checkbox to toggle external display mode.
• Updates to NativeEmulation.cpp to manage pad surface lifecycle and native window state.

Add DisplayUtils and setPadRotatedLeft JNI

• Introduces DisplayUtils.kt to centralize screen-related logic.
• Adds setPadRotatedLeft() JNI to handle GamePad screen rotation explicitly.

Refactor screen rotation and add screen swapping feature

• Adds a new swap_screens boolean to flip the main and GamePad displays.
• Updates UI, touch input, and renderer logic accordingly.
• Adds screen swap checkbox to side menu.

Add WindowManager flags to prevent focus and touch modal in EmulationActivity

• Ensures external display windows do not steal focus or input from the main display.

Fix screen swap touch controls

• Corrects touch logic for both main and external GamePad views when screens are swapped.
• Canvas touch listeners now respect the swapped state for accurate interaction.

Tested on

• Ayaneo Pocket DS
• Pocket ACE + Retroid Dual Screen Add-on.

🙏 Special Thanks

Huge thanks to @retrogamecorps for his testing efforts in making this version possible.