GXSetScissor

• Category: Clipping and Culling
• Matrix Status: Implemented
• Matrix Notes: Verified against docs; stores GX screen-space scissor (xOrig/yOrig/wd/ht), applies GL scissor in GX top-left coordinates, and flushes pending vertices before state switch.
• 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/Culling/GXSetScissor.html and SDK source in reference/gx/GXTransform.c.
• SDK behavior:
  • Accepts (xOrig, yOrig, wd, ht) in screen coordinates with top-left origin.
  • Writes scissor register state immediately (with in-begin guard via CHECK_IN_BGN).
• Runtime parity update in src/gx/pc_gx.c:
  • Added pc_gx_flush_if_begin_complete() at start of GXSetScissor so queued geometry is emitted before scissor-state change.
  • Keeps stored GX scissor rectangle and GL Y-flip mapping unchanged.