CTroll3D is a 3DS homebrew that allows you to control the Citra emulator from your 3DS. For this to work, you need a version of Citra that supports CTroll3D and the CTroll3D homebrew on your 3DS.
- Bottom screen mirroring.
- CTroll3D.3dsx (or you can clone/download the source and build it yourself).
- Citra that supports CTroll3D.
If you are on macOS 11 or later, you can download a binary release from the developer. Otherwise, you can clone/download the source code and follow the instructions to build the emulator:
How to use
Open the CTroll3D homebrew on your 3DS.
On Citra, access the menu option: Tools> Connect CTroll3D, and enter your 3DS IP Address.
glReadPixels and VSync doesn't perform too well. So to increase the performance, please disable the VSync on Citra (and some other heavy stuffs like Accurate Multiplications).
You can access these options in Preferences > Graphics > Advanced.
In some cases, the bottom screen mirroring can slow down your emulation, and should be disabled by pressing L+R+Down+Touchscreen (it can be enabled by L+R+Up+Touchscreen).