Two Stop Bits

A developer implemented real-time 3D shader rendering on Game Boy Color hardware by encoding normal maps as spherical coordinates and using logarithm-based lookup tables to simulate multiplication without a multiply instruction. The solution processes 15 tiles per frame using 8-bit fixed-point arithmetic, self-modifying code for optimization, and achieves ~130 cycles per pixel. The project includes a complete workflow from Blender normal map generation to SM83 assembly implementation, with detailed mathematical explanations of the Lambert shader calculations adapted for extreme hardware constraints.

I put a real-time 3D shader on the Game Boy Color