v1.6.6 — Visibility Parity

v1.6.6 — Visibility Parity

Tagged 2026-09-24.

Summary

Fifth theme in the 1.6.x visual + play parity arc (man/tank/boat/sound, v1.6.5) that Jerod's
original roadmap ruling missed: forest concealment. Live-observed and reported: a tank entering
forested terrain should become progressively less visible with distance and cover -- never
fully invisible up close, fading in as an observer approaches.

Fixed since v1.6.5

• #153 -- forest concealment (forestvis()/
  calcvis(), bolo.c:174/217-321) was already a faithful, differentially-tested port
  (Sources/BoloKit/CalcVis.swift, Sources/BoloKit/PillTick.swift) and already wired into
  rendering (GameRenderView.swift's visFraction) -- but gated behind state.hiddenMines
  being on and a fogState existing. Forest concealment is core, always-on oracle gameplay,
  unrelated to the separate Hidden Mines fog-of-war feature (#1); the default (hiddenMines
  off) meant it never fired at all.
• Host/client asymmetry, confirmed live: the host got concealment (when Hidden Mines was
  on), but a joined guest never did, in any mode -- GameRenderView.render(_:fogState:) defaults
  fogState to nil, and only the host render path ever supplied a real one. Forest
  concealment only ever needed state.terrain (already synced to guests), never fogState
  itself -- only the fog term did.
• Fix: calcVis now accepts fogState: FogState?; a missing one means "no fog
  contribution," not "skip forest concealment." visFraction's tank/walking-builder path
  (matching the oracle's own per-sprite-kind calcvis() choice) always calls calcVis now.
  Fixes host, solo, and join uniformly through the same render call sites -- no join-path-
  specific change needed. The parachuting-builder state deliberately stays on plain fogVis
  (GSBoloView.m:389 uses fogvis, not calcvis, for an airborne builder -- correct oracle
  behavior, not a gap).
• Softened the sea/river water textures (applySeaShading/applyRiverFlow,
  GlyphSource.swift) -- reported as too bold/high-contrast; halved each texture's color delta
  from its base fill.

Testing

4 new differential unit tests (FogDifferentialTests.swift, calcVis with fogState: nil)
plus 2 new offscreen pixel-diff render tests (VisibilityParityTests.swift) confirming the
actual reported symptom: a forest-buried enemy tank renders differently than one in the open
with no fogState at all, and more visibly the closer the observer gets. 148/148 Bolo 2026Tests and 956/956 SwiftPM tests green (known pre-existing timing/port-contention flakes,
confirmed unrelated and passing in isolation).

See docs/STATUS.md for full detail.