mtcontrib/mapgen_rivers
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Optimized load.lua by avoiding multi-argument packing

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Gaël C 2021-06-26 11:49:26 +02:00
parent 9cda649c93
commit 636773487a
1 changed files with 5 additions and 4 deletions
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9
load.lua
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@ -6,19 +6,20 @@ function mapgen_rivers.load_map(filename, bytes, signed, size)
if #data < bytes*size then if #data < bytes*size then
data = minetest.decompress(data) data = minetest.decompress(data)
end end
local sbyte = string.byte
local map = {} local map = {}
for i=1, size do for i=1, size do
local i0, i1 = (i-1)*bytes+1, i*bytes local i0 = (i-1)*bytes+1
local elements = {data:byte(i0, i1)} local elements = {data:byte(i0, i1)}
local n = elements[1] local n = sbyte(data, i0)
if signed and n >= 128 then if signed and n >= 128 then
n = n - 256 n = n - 256
end end
for j=2, bytes do for j=1, bytes-1 do
n = n*256 + elements[j] n = n*256 + sbyte(data, i0+j)
end end
map[i] = n map[i] = n