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Explain order of bits in wireflags

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This commit is contained in:
Elias Åström 2024-11-17 15:03:34 +01:00 committed by cora
parent 36ee008105
commit 9082549b8e
1 changed files with 9 additions and 9 deletions
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18
mods/ITEMS/REDSTONE/mcl_redstone/wire.lua
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@ -3,7 +3,7 @@ local S = minetest.get_translator(minetest.get_current_modname())
-- Wireflags are numbers with binary representation YYYYXXXX where XXXX
-- determines if there is a visible connection in each of the four cardinal
-- directions and YYYY if the respective connection also goes up over the
-- neighbouring node.
-- neighbouring node. Order of the bits (right to left) are -z, +x, +z, -x.
local wires = {}
for y0 = 0, 15 do
@ -46,14 +46,6 @@ local function check_bit(n, b)
return bit.band(n, bit.lshift(1, b)) ~= 0
end
-- Transform illegal wireflags like 0b11110011 to legal ones like 0b00110011 to
-- avoid unknown node crashes when updating nodes.
local function make_legal(wireflags)
local y0 = bit.band(wireflags, 0xf)
local y1 = bit.band(y0, bit.rshift(wireflags, 4))
return bit.bor(bit.lshift(y1, 4), y0)
end
-- Make wires which only extend in one direction also extend in the opposite
-- direction.
local function make_long(wireflags)
@ -75,6 +67,14 @@ local function make_long(wireflags)
return wireflags
end
-- Transform illegal wireflags like 0b11110011 to legal ones like 0b00110011 to
-- avoid unknown node crashes when updating nodes.
local function make_legal(wireflags)
local y0 = bit.band(wireflags, 0xf)
local y1 = bit.band(y0, bit.rshift(wireflags, 4))
return bit.bor(bit.lshift(y1, 4), y0)
end
local function wireflags_to_name(wireflags)
return wireflags == 0 and
"mcl_redstone:redstone" or