113 lines
2.8 KiB
Lua
113 lines
2.8 KiB
Lua
local EvolutionModel = dofile(mapgen_rivers.modpath .. '/terrainlib_lua/erosion.lua')
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local twist = dofile(mapgen_rivers.modpath .. '/terrainlib_lua/twist.lua')
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local blocksize = mapgen_rivers.settings.blocksize
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local tectonic_speed = mapgen_rivers.settings.tectonic_speed
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local np_base = table.copy(mapgen_rivers.noise_params.base)
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local evol_params = mapgen_rivers.settings.evol_params
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local time = mapgen_rivers.settings.evol_time
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local time_step = mapgen_rivers.settings.evol_time_step
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local niter = math.ceil(time/time_step)
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time_step = time / niter
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-- Setup the model
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local grid = mapgen_rivers.grid
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local size = grid.size
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local seed = tonumber(minetest.get_mapgen_setting("seed"))
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np_base.seed = (np_base.seed or 0) + seed
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local nobj_base = PerlinNoiseMap(np_base, {x=size.x, y=1, z=size.y})
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local dem = nobj_base:get_3d_map_flat({x=0, y=0, z=0})
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dem.X = size.x
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dem.Y = size.y
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local model = EvolutionModel(evol_params)
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model.dem = dem
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local ref_dem = model:define_isostasy(dem)
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local tectonic_step = tectonic_speed * time_step
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collectgarbage()
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-- Run the model
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for i=1, niter do
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minetest.log("info", "[mapgen_rivers] Iteration " .. i .. " of " .. niter)
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model:diffuse(time_step)
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model:flow()
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model:erode(time_step)
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if i < niter then
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if tectonic_step ~= 0 then
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nobj_base:get_3d_map_flat({x=0, y=tectonic_step*i, z=0}, ref_dem)
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end
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model:isostasy()
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end
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collectgarbage()
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end
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model:flow()
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local mfloor = math.floor
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local mmin, mmax = math.min, math.max
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local offset_x, offset_y = twist(model.dirs, model.rivers, 5)
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for i=1, size.x*size.y do
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offset_x[i] = mmin(mmax(offset_x[i]*256, -128), 127)
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offset_y[i] = mmin(mmax(offset_y[i]*256, -128), 127)
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end
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-- Write the results in the world directory
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minetest.mkdir(mapgen_rivers.world_data_path)
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local function write_map(filename, data, bytes)
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local size = #data
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local file = io.open(worldpath .. filename, 'wb')
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local bytelist = {}
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for j=1, bytes do
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bytelist[j] = 0
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end
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local unpk = unpack
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local schar = string.char
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local floor = math.floor
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for i=1, size do
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local n = floor(data[i])
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data[i] = n
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for j=bytes, 2, -1 do
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bytelist[j] = n % 256
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n = floor(n / 256)
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end
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bytelist[1] = n % 256
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file:write(schar(unpk(bytelist)))
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end
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file:close()
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end
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write_map('dem', model.dem, 2)
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write_map('lakes', model.lakes, 2)
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write_map('dirs', model.dirs, 1)
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write_map('rivers', model.rivers, 4)
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write_map('offset_x', offset_x, 1)
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write_map('offset_y', offset_y, 1)
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local sfile = io.open(mapgen_rivers.world_data_path .. 'size', "w")
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sfile:write(size.x..'\n'..size.y)
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sfile:close()
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if not mapgen_rivers.settings.use_interactive_loader then
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mapgen_rivers.grid = {
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size = {x=size_x, y=size_y},
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dem = model.dem,
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lakes = model.lakes,
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dirs = model.dirs,
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rivers = model.rivers,
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offset_x = offset_x,
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offset_y = offset_y,
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}
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end
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