maplint

const (
	// VoidFeature — the canonical sentinel TA writes into
	// TileAttr.Feature for impassable / void cells.  0xFFFF means "no
	// feature, passable"; 0xFFFE / 0xFFFD also appear in the wild on a
	// handful of early Cavedog maps (Metal Heck has 724 of them on
	// what are clearly buildable steam-vent cells, and Lava Run has a
	// similar pattern) — their semantics are not "void" in the engine
	// and we treat them as "no feature" defensively.
	VoidFeature = uint16(0xFFFC)

	// MetalProximityTiles — a start position is flagged when its
	// nearest metal-producing feature is further than this many
	// tiles (1 tile = 32 game-pixels, 1 attribute cell = 16 px).
	// 24 tiles ≈ 1.5× commander beam reach, generous early-game
	// expansion range.
	MetalProximityTiles = 24

	// HeightDiscontinuityThreshold — adjacent attribute cells with
	// |Δheight| beyond this read as cliffs that walking units
	// can't traverse.  TA's units can step ~16 height per attr
	// cell; 32 is double that and a reliable "this looks broken"
	// floor.
	HeightDiscontinuityThreshold = 32

	// MetalRichSurfaceThreshold — when a schema's SurfaceMetal is
	// at or above this value the map is considered metal-rich
	// (Metal Heck uses 255).  In that mode the engine extracts
	// metal from open ground via mexes anywhere, so the
	// metal-proximity check skips that schema's starts.
	MetalRichSurfaceThreshold = 8

	// VoidIslandsTolerance — flood-fill from starts will routinely
	// strand a few cells in tight corners or behind feature
	// footprints.  Anything under this count is treated as
	// acceptable noise and the check stays green.
	VoidIslandsTolerance = 20
)