1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
local ecs = require 'honey.ecs.ecs'
local module = {}
setmetatable(module, {__index=_G})
setfenv(1, module)
--===== transform cascading =====--
local function recursiveTransform(db, id, node)
if node._visited then
return node._matrix
end
if not node.parent then
node._matrix = node.matrix
else
local parentNode = db:getComponent(node.parent, "node")
local parentMatrix = recursiveTransform(db, node.parent, parentNode)
node._matrix = parentMatrix * node.matrix
if node.name then
if not parentNode._child then parentNode._child = {} end
parentNode._child[node.name] = ecs.Accessor(db, id)
end
end
node._visited = true
return node._matrix
end
system = {ecs.System("node", function(db, dt, params)
local nodes = db:queryComponent("node")
-- prepare nodes
for id, node in pairs(nodes) do
node._visited = false
node._child = nil
end
-- compute nodes
for id, node in pairs(nodes) do
recursiveTransform(db, id, node)
end
end)}
return module
|
