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Made :each()'s order deterministic

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As table hashes are generated from their GC pointer, and these pointers
are potentially different each time a program is run, using them for
keys in a table causes the iteration order to potentially differ between
runs, too. This commit changes each_overlapping_entity() to not iterate
the set of entities, assuring the order in which :each() passes entities
to the callback function is deterministic.
This commit is contained in:
rxi 2017-03-23 19:13:34 +00:00
parent 6a6a7dea85
commit 90476217a3
1 changed files with 7 additions and 8 deletions
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15
shash.lua
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@ -138,13 +138,14 @@ local function overlaps(e1, e2)
end end
local function add_each_overlapping_in_cell(self, idx, e, set) local function each_overlapping_in_cell(self, idx, e, set, fn, ...)
local t = self.cells[idx] local t = self.cells[idx]
if not t then if not t then
return return
end end
for i, v in ipairs(t) do for i, v in ipairs(t) do
if e ~= v and overlaps(e, v) then if e ~= v and overlaps(e, v) and not set[v] then
fn(v[5], ...)
set[v] = true set[v] = true
end end
end end
@ -152,16 +153,14 @@ end
local function each_overlapping_entity(self, e, fn, ...) local function each_overlapping_entity(self, e, fn, ...)
-- Init set -- Init set for keeping track of which entities have already been handled
local set = table.remove(self.tablepool) or {} local set = table.remove(self.tablepool) or {}
-- Do overlap checks and add overlapping to set -- Do overlap checks
each_overlapping_cell(self, e, add_each_overlapping_in_cell, e, set) each_overlapping_cell(self, e, each_overlapping_in_cell, e, set, fn, ...)
-- Do callback for each entity in set and clear set -- Clear set and return to pool
for v in pairs(set) do for v in pairs(set) do
fn(v[5], ...)
set[v] = nil set[v] = nil
end end
-- Return set to pool
table.insert(self.tablepool, set) table.insert(self.tablepool, set)
end end