# resident_count.ludic - what a file-backed mesh holds now: its tiles in, their bytes, and how many it has
# how many of kind's tiles are in, and (nav_tiles_bytes) how many bytes those hold
export function nav_tiles_in(nav_st: NavState, kind: int) -> int { return nv_tiles_sum(nav_st, kind, false) }
export function nav_tiles_bytes(nav_st: NavState, kind: int) -> int { return nv_tiles_sum(nav_st, kind, true) }
function nv_tiles_sum(nav_st: NavState, kind: int, bytes: bool) -> int {
  let h = nv_mesh(nav_st, kind)
  if h == null { return 0 }
  var n = 0
  for i in 0 .. nvc_index_count(h) {
    nvc_index_tile(h, i, nav_st.nv_tile)
    if nav_st.nv_tile[2] > 0.5 and bytes { n += int(nav_st.nv_tile[3]) }
    if nav_st.nv_tile[2] > 0.5 and not bytes { n += 1 }
  }
  return n
}
# how many tiles kind's file holds in all
export function nav_tiles_all(nav_st: NavState, kind: int) -> int {
  let h = nv_mesh(nav_st, kind)
  if h == null { return 0 }
  return nvc_index_count(h)
}