GXSetTevAlphaIn

• Category: Texture Environment
• Matrix Status: Implemented
• Matrix Notes: Implemented with typed TEV alpha args and per-stage state updates.
• Matrix Link: Gfx-GX-API-Matrix

Official SDK (Reference)

• Manual page: reference/man/gfx/gx/Tev/GXSetTevAlphaIn.html
• SDK source: reference/ACGC-PC-Port/src/static/dolphin/gx/GXTev.c (GXSetTevAlphaIn)
• SDK behavior:
  • Programs TEV alpha combiner inputs a,b,c,d for one TEV stage.
  • Writes TEV stage alpha-input register fields; no direct alpha-op mutation.
  • SDK debug path asserts stage range and argument ranges (a..d <= 7).

libPorpoise Implementation

• Public API declaration: include/dolphin/gx/GXTev.h
• Runtime implementation: src/gx/pc_gx.c (GXSetTevAlphaIn)
• Behavior:
  • Stores a,b,c,d per TEV stage in renderer state and marks TEV state dirty.
  • Ignores out-of-range stage by returning early.

SDK vs Porpoise Diff

• Signature parity:
  • Signatures match (GXTevStageID, four GXTevAlphaArg operands).
• Behavioral parity:
  • Stage-local alpha-input programming behavior matches TEV semantics.
• Known divergence:
  • SDK debug path asserts on invalid stage/operand ranges; Porpoise fail-soft ignores invalid stage and does not enforce operand-range asserts in this setter path.

Validation Checklist

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

Working Notes

• No runtime code change required in this pass.