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39 lines
539 B
Lua
39 lines
539 B
Lua
local ecs = require "ecs"
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local w = ecs.world()
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w:register {
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name = "order",
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order = true,
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}
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w:register {
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name = "node",
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"id:int",
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"parent:int",
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}
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w:new {
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node = { id = 1, parent = 0 } ,
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order = true,
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}
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w:new {
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node = { id = 0, parent = -1 },
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order = true,
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}
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local cache = {}
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for v in w:select "order node:update" do
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local node = v.node
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if node.parent < 0 or cache[node.parent] then
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cache[node.id] = true
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print(node.id, node.parent)
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else
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v.order = false
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end
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end
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assert(pcall(w.select, w, "node order") == false)
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