59 lines
2.0 KiB
Lua
59 lines
2.0 KiB
Lua
math.randomseed(os.time())
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function init()
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local LifeState = world:get_type_by_name("LifeState")
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local life_state = world:get_component(entity, LifeState)
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local cells = life_state.cells
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-- set some cells alive
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for _ = 1, 10000 do
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local index = math.random(#cells)
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cells[index] = 255
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end
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end
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function on_update()
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local LifeState = world:get_type_by_name("LifeState")
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local Settings = world:get_type_by_name("Settings")
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local life_state = world:get_component(entity, LifeState)
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-- note currently this is a copy of the cells, as of now the macro does not automatically support Vec<T> proxies by reference
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local cells = life_state.cells
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-- note that here we do not make use of LuaProxyable and just go off pure reflection
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local settings = world:get_resource(Settings)
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local dimensions = settings.physical_grid_dimensions
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-- primitives are passed by value to lua, keep a hold of old state but turn 255's into 1's
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local prev_state = {}
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for k, v in pairs(cells) do
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prev_state[k] = (not (v == 0)) and 1 or 0
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end
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for i = 1, (dimensions[1] * dimensions[2]) do
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local north = prev_state[i - dimensions[1]] or 1
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local south = prev_state[i + dimensions[1]] or 1
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local east = prev_state[i + 1] or 1
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local west = prev_state[i - 1] or 1
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local northeast = prev_state[i - dimensions[1] + 1] or 1
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local southeast = prev_state[i + dimensions[1] + 1] or 1
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local northwest = prev_state[i - dimensions[1] - 1] or 1
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local southwest = prev_state[i + dimensions[1] - 1] or 1
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local neighbours = north + south + east + west
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+ northeast + southeast + northwest + southwest
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-- was dead and got 3 neighbours now
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if prev_state[i] == 0 and neighbours == 3 then
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cells[i] = 255
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-- was alive and should die now
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elseif prev_state[i] == 1 and ((neighbours < 2) or (neighbours > 3)) then
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cells[i] = 0
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end
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end
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-- propagate the updates
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life_state.cells = cells
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end
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