Notes

• vendor/sh4_math.h lives in shachi/vendor/ — unmodified public domain file.
• KOS’s mat_transform() already does bulk FTRV. Shachi adds perspective divide and normalize.
• All batch functions should be written in SH4 asm with proper pipeline hazard mitigation (see codex/hardware/SH4_TIMING.md).

Spec 3: DC Native Asset Formats (shachi/assets.h)

Problem

Runtime format conversion (PNG→PVR texture, OBJ→triangle strip) wastes precious SH-4 cycles. The Katana SDK solved this with offline conversion tools (PVRConv, GDWorkshop). Shachi needs a build-time pipeline that produces DC-native formats, and runtime loaders that can memcpy them straight to VRAM.