GXSetTevIndTile

• Category: Indirect Texturing
• Matrix Status: Partial
• Matrix Notes: Parity-checked helper semantics (tile-size wrap decode, matrix setup, and indirect stage configuration) are in place; final fidelity is bounded by GXSetTevIndirect backend approximation.
• Matrix Link: Gfx-GX-API-Matrix

Official SDK (Reference)

• Manual page: reference/man/gfx/gx/Indirect/GXSetTevIndTile.html
• SDK source: reference/gx/GXBump.c (GXSetTevIndTile, around lines 421+)
• Verified SDK behavior:
  • Maps tile sizes {16,32,64,128,256} to {GX_ITW_16,32,64,128,256}.
  • Invalid tile sizes assert in debug and fall back to GX_ITW_OFF.
  • Builds indirect matrix:
    • mtx[0][0] = tilespacing_s / 1024
    • mtx[1][1] = tilespacing_t / 1024
    • other terms are 0
  • Calls GXSetIndTexMtx(matrix_sel, mtx, 10).
  • Calls GXSetTevIndirect(..., format, bias_sel, matrix_sel, wrap_s, wrap_t, FALSE, TRUE, alpha_sel).

libPorpoise Implementation

• Runtime implementation area: src/gx
• Public API surface: include/dolphin/gx
• Current implementation:
  • src/gx/pc_gx.c: GXSetTevIndTile performs the same tile-size wrap mapping (invalid -> GX_ITW_OFF), same matrix construction, calls GXSetIndTexMtx(..., 10), and forwards to GXSetTevIndirect with add_prev=GX_FALSE and utc_lod=GX_TRUE.

SDK vs Porpoise Diff

• Signature parity:
  • SDK: void GXSetTevIndTile(...)
  • Porpoise: same
• Behavioral parity:
  • Tile-size decode, matrix setup, and forwarding parameters match SDK.
• Known divergence:
  • As with other indirect helpers, end-to-end accuracy is limited by remaining GXSetTevIndirect approximation points (notably bump-alpha side behavior).

Validation Checklist

• GX demo coverage checked (indirect tiling setup path)
• Pikmin usage path checked (indirect helper forwarding path)
• Matrix status updated if needed
• Notes updated with concrete file/function references

Working Notes

• No runtime patch required for this function; implementation already matched SDK helper behavior.