GXGetProjectionv

• Category: Transformation and Matrix
• Matrix Status: Implemented
• Matrix Notes: Verified projection vector layout (type, then p0-p5) and SDK-style strict pointer semantics (no fail-soft NULL guard).
• Matrix Link: Gfx-GX-API-Matrix

Official SDK (Reference)

• Manual root: reference/rvlsdk/man/en_US/gx
• Primary SDK source area: demos/PikminDemo/src/gx (GC-style Dolphin GX source)
• Notes:
  • Confirm official signature/prototype
  • Confirm documented side effects (register/state updates)
  • Confirm special behavior and edge cases from manual

libPorpoise Implementation

• Runtime implementation area: src/gx
• Public API surface: include/dolphin/gx
• Notes:
  • Confirm API signature matches SDK
  • Confirm state writes match SDK semantics
  • Confirm backend behavior in PC renderer path

SDK vs Porpoise Diff

• Signature parity:
  • SDK:
  • Porpoise:
• Behavioral parity:
  • SDK:
  • Porpoise:

• Known divergence:

Validation Checklist

• GX demo coverage checked
• Pikmin usage path checked
• Matrix status updated if needed
• Notes updated with concrete file/function references

Working Notes

• Docs checked against reference/man/gfx/gx/Transform/GXGetProjectionv.html and SDK source in reference/gx/GXTransform.c.
• SDK behavior:
  • Outputs projection array as p[0]=type, p[1..6]=p0..p5.
  • Uses assert-style pointer contract (ASSERTMSG(ptr, GXERR_GET_NULL_PTR)), not fail-soft return.
• Runtime parity update in src/gx/pc_gx.c:
  • Removed defensive if (!p) return; from GXGetProjectionv.
  • Kept matrix-field mapping aligned with documented perspective/orthographic formats.