Worked on enhancing the shader pipeline robustness for the libretro/RetroArch project, focusing on cross-API consistency between Metal and D3D11 backends. Addressed rendering fidelity by implementing a complete mipmapping workflow for the Metal graphics driver and stabilizing D3D11 shader rendering across the full pass chain. Utilized C, C++, and Objective-C to resolve issues with texture semantics, sampler handling, and rotation logic, ensuring accurate display and platform consistency on both Windows and macOS. The work reduced support overhead by improving shader reflection and pass referencing, resulting in a more reliable user experience and streamlined maintenance for graphics programming workflows.