The port replaces the PC desktop backends (OpenGL + SDL2) with a hand-written Citro3D backend. The N64's display-list interpreter runs on the ARM11 and drives the PICA200 through its fixed-function TEV stages — no programmable fragment shader on the PICA, so each N64 colour-combiner formula is translated at load time into a chain of TEV stages.
Highlights:
• 45ish FPS on New 3DS (above the N64 original's ~20ish FPS)
• Native stereoscopic 3D — single-pass: geometry is submitted once and replayed per-eye with a clip-space shear uniform, so 3D is essentially free on the geometry budget
• Full N64 audio synth on a dedicated ARM11 core — the naudio/libultra stack runs on core 2 on New 3DS, so heavy frames never chop audio
• Eyespy fisheye lens and motion blur — implemented via render-to-texture (forward C3D target chains, no mid-frame FrameSplit)
• Distance fog via the PICA fixed-function fog unit
• ROM streaming on OG 3DS(untested on real hardware) — the 32 MB N64 ROM is demand-streamed off the SD card so it fits in original hardware's FCRAM
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