At some point, we may completely overhaul how link cable emulation works so that multiple GBA emulators can implement support for it. This might be enough to make hooking up your favourite other emulators really easy to the point where it isn't worth having one integrated even from the perspective of a user who has to do no real work to make it happen. I suppose that there might also come a point where we expose an interface so a GBA emulator could be connected as a virtual GameBoy Player. There isn't much advantage to that, though, as all that would happen is there'd be extra performance impact compared to just emulating the game and not sending the output to another emulator. When the GameBoy Player supports additional features like rumble, good GBA emulators also support rumble, even though an actual GBA didn't.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
