mtcontrib/mapgen_rivers
1
0
Fork 0
mirror of https://gitlab.com/gaelysam/mapgen_rivers.git synced 2025-02-20 14:00:32 +01:00
Code Issues Projects Releases Wiki Activity

Load data on request instead of loading everything at first.

Browse Source 
Data is cached in memory in case it is reused.
Offset values have a callback that converts them to the range ±0.5
This commit is contained in:
Gaël C 2021-06-26 11:50:52 +02:00
parent 636773487a
commit 7e39189368
2 changed files with 61 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
load.lua
View File

@ -1,6 +1,6 @@
local worldpath = mapgen_rivers.world_data_path
function mapgen_rivers.load_map(filename, bytes, signed, size)
function mapgen_rivers.load_map(filename, bytes, signed, size, converter)
local file = io.open(worldpath .. filename, 'rb')
local data = file:read('*all')
if #data < bytes*size then
@ -26,9 +26,49 @@ function mapgen_rivers.load_map(filename, bytes, signed, size)
end
file:close()
if converter then
for i=1, size do
map[i] = converter(map[i])
end
end
return map
end
local sbyte = string.byte
local loader_mt = {
__index = function(loader, i)
local file = loader.file
local bytes = loader.bytes
file:seek('set', (i-1)*bytes)
local strnum = file:read(bytes)
local n = sbyte(strnum, 1)
if loader.signed and n >= 128 then
n = n - 256
end
for j=2, bytes do
n = n*256 + sbyte(strnum, j)
end
if loader.conv then
n = loader.conv(n)
end
loader[i] = n
return n
end,
}
function mapgen_rivers.interactive_loader(filename, bytes, signed, size, converter)
local file = io.open(worldpath .. filename, 'rb')
if file then
converter = converter or false
return setmetatable({file=file, bytes=bytes, signed=signed, size=size, conv=converter}, loader_mt)
end
end
function mapgen_rivers.write_map(filename, data, bytes)
local size = #data
local file = io.open(worldpath .. filename, 'wb')

35
polygons.lua
View File

@ -14,35 +14,40 @@ mapgen_rivers.grid = {}
local X = 1000
local Z = 1000
local function offset_converter(o)
return (o + 0.5) * (1/256)
end
-- Try to read file 'size'
local sfile = io.open(world_data_path..'size', 'r')
if sfile then
X, Z = tonumber(sfile:read('*l')), tonumber(sfile:read('*l'))
sfile:close()
minetest.register_on_mods_loaded(function()
local grid = mapgen_rivers.grid
grid.dem = mapgen_rivers.load_map('dem', 2, true, X*Z)
grid.lakes = mapgen_rivers.load_map('lakes', 2, true, X*Z)
grid.dirs = mapgen_rivers.load_map('dirs', 1, false, X*Z)
grid.rivers = mapgen_rivers.load_map('rivers', 4, false, X*Z)
grid.dem = mapgen_rivers.interactive_loader('dem', 2, true, X*Z)
grid.lakes = mapgen_rivers.interactive_loader('lakes', 2, true, X*Z)
grid.dirs = mapgen_rivers.interactive_loader('dirs', 1, false, X*Z)
grid.rivers = mapgen_rivers.interactive_loader('rivers', 4, false, X*Z)
grid.offset_x = mapgen_rivers.load_map('offset_x', 1, true, X*Z)
grid.offset_y = mapgen_rivers.load_map('offset_y', 1, true, X*Z)
grid.offset_x = mapgen_rivers.interactive_loader('offset_x', 1, true, X*Z, offset_converter)
grid.offset_y = mapgen_rivers.interactive_loader('offset_y', 1, true, X*Z, offset_converter)
end)
else
-- Generate a map!!
local pregenerate = dofile(mapgen_rivers.modpath .. '/pregenerate.lua')
minetest.register_on_mods_loaded(pregenerate)
minetest.register_on_mods_loaded(function()
pregenerate()
local offset_x = mapgen_rivers.grid.offset_x
local offset_y = mapgen_rivers.grid.offset_y
for i=1, X*Z do
offset_x[i] = offset_converter(offset_x[i])
offset_y[i] = offset_converter(offset_y[i])
end
end)
end
minetest.register_on_mods_loaded(function()
local offset_x, offset_y = mapgen_rivers.grid.offset_x, mapgen_rivers.grid.offset_y
for i=1, #offset_x do
offset_x[i] = (offset_x[i]+0.5) * (1/256)
offset_y[i] = (offset_y[i]+0.5) * (1/256)
end
end)
mapgen_rivers.grid.size = {x=X, y=Z}
local function index(x, z)