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It's not really about 2D/3D. The chip8 and gacubeboy emulators are both 2D and use GX2. I think they'reSo for an 2D emulator --> RGBA
3D Emulator --> Luck + BGRA/RGB
also using RGB565, though don't hold me to that one.
Brave souls could also make a software 3D renderer for OSScreen, which would be RGBA8888 (can someone please clear up the correct notation for these?)