GXSetClipMode

• Category: Clipping and Culling
• Matrix Status: Partial
• Matrix Notes: Clip mode value is tracked and sanitized to SDK enum values; backend intentionally keeps standard clipping (no direct emulation of GX clip-disable path).
• 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/GXSetClipMode.html and SDK source in reference/gx/GXTransform.c.
• SDK behavior:
  • Writes mode directly to XF clip-disable register (XF_CLIPDISABLE) with GX_CLIP_ENABLE/GX_CLIP_DISABLE.
• Runtime behavior in src/gx/pc_gx.c:
  • Flushes pending geometry before state change.
  • Stores clip mode with enum sanitization (DISABLE or ENABLE), matching SDK accepted-value domain.
  • Keeps GL_DEPTH_CLAMP disabled to avoid incorrect overdraw artifacts from prior approximation attempts.
• Known divergence:
  • GX_CLIP_DISABLE is tracked but not fully emulated in GL rasterization path; clipping remains effectively enabled.