251 lines
6.9 KiB
Lua
251 lines
6.9 KiB
Lua
local modpath = minetest.get_modpath(minetest.get_current_modname()) .. '/'
|
|
local worldpath = minetest.get_worldpath() .. '/'
|
|
local load_map = dofile(modpath .. 'load.lua')
|
|
local geometry = dofile(modpath .. 'geometry.lua')
|
|
|
|
local function copy_if_needed(filename)
|
|
local wfilename = worldpath..filename
|
|
local wfile = io.open(wfilename, 'r')
|
|
if wfile then
|
|
wfile:close()
|
|
return
|
|
end
|
|
local mfilename = modpath..filename
|
|
local mfile = io.open(mfilename, 'r')
|
|
local wfile = io.open(wfilename, 'w')
|
|
wfile:write(mfile:read("*all"))
|
|
mfile:close()
|
|
wfile:close()
|
|
end
|
|
|
|
copy_if_needed('size')
|
|
local sfile = io.open(worldpath..'size')
|
|
local X = tonumber(sfile:read('*l'))
|
|
local Z = tonumber(sfile:read('*l'))
|
|
|
|
copy_if_needed('dem')
|
|
local dem = load_map(worldpath..'dem', 2, true)
|
|
copy_if_needed('lakes')
|
|
local lakes = load_map(worldpath..'lakes', 2, true)
|
|
copy_if_needed('links')
|
|
local links = load_map(worldpath..'links', 1, false)
|
|
copy_if_needed('rivers')
|
|
local rivers = load_map(worldpath..'rivers', 4, false)
|
|
|
|
copy_if_needed('offset_x')
|
|
local offset_x = load_map(worldpath..'offset_x', 1, true)
|
|
for k, v in ipairs(offset_x) do
|
|
offset_x[k] = (v+0.5)/256
|
|
end
|
|
|
|
copy_if_needed('offset_y')
|
|
local offset_z = load_map(worldpath..'offset_y', 1, true)
|
|
for k, v in ipairs(offset_z) do
|
|
offset_z[k] = (v+0.5)/256
|
|
end
|
|
|
|
|
|
local function index(x, z)
|
|
return z*X+x+1
|
|
end
|
|
|
|
local function get_point_location(x, z)
|
|
local i = index(x, z)
|
|
return x+offset_x[i], z+offset_z[i]
|
|
end
|
|
|
|
local function interp(v00, v01, v10, v11, xf, zf)
|
|
local v0 = v01*xf + v00*(1-xf)
|
|
local v1 = v11*xf + v10*(1-xf)
|
|
return v1*zf + v0*(1-zf)
|
|
end
|
|
|
|
local data = {}
|
|
|
|
local blocksize = 12
|
|
local sea_level = 1
|
|
local min_catchment = 25
|
|
|
|
local storage = minetest.get_mod_storage()
|
|
if storage:contains("blocksize") then
|
|
blocksize = storage:get_int("blocksize")
|
|
else
|
|
storage:set_int("blocksize", blocksize)
|
|
end
|
|
if storage:contains("sea_level") then
|
|
sea_level = storage:get_int("sea_level")
|
|
else
|
|
storage:set_int("sea_level", sea_level)
|
|
end
|
|
if storage:contains("min_catchment") then
|
|
min_catchment = storage:get_float("min_catchment")
|
|
else
|
|
storage:set_float("min_catchment", min_catchment)
|
|
end
|
|
|
|
local function generate(minp, maxp, seed)
|
|
local c_stone = minetest.get_content_id("default:stone")
|
|
local c_dirt = minetest.get_content_id("default:dirt")
|
|
local c_lawn = minetest.get_content_id("default:dirt_with_grass")
|
|
local c_sand = minetest.get_content_id("default:sand")
|
|
local c_water = minetest.get_content_id("default:water_source")
|
|
local c_rwater = minetest.get_content_id("default:river_water_source")
|
|
|
|
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
|
|
vm:get_data(data)
|
|
|
|
local a = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
|
|
local ystride = a.ystride -- Tip : the ystride of a VoxelArea is the number to add to the array index to get the index of the position above. It's faster because it avoids to completely recalculate the index.
|
|
local chulens = maxp.z - minp.z + 1
|
|
|
|
local polygon_number = {}
|
|
local polygons = {}
|
|
local xpmin, xpmax = math.max(math.floor(minp.x/blocksize - 0.5), 0), math.min(math.ceil(maxp.x/blocksize), X-2)
|
|
local zpmin, zpmax = math.max(math.floor(minp.z/blocksize - 0.5), 0), math.min(math.ceil(maxp.z/blocksize), Z-2)
|
|
local n = 1
|
|
local n_filled = 0
|
|
for xp = xpmin, xpmax do
|
|
for zp=zpmin, zpmax do
|
|
local iA = index(xp, zp)
|
|
local iB = index(xp+1, zp)
|
|
local iC = index(xp+1, zp+1)
|
|
local iD = index(xp, zp+1)
|
|
local poly_x = {offset_x[iA]+xp, offset_x[iB]+xp+1, offset_x[iC]+xp+1, offset_x[iD]+xp}
|
|
local poly_z = {offset_z[iA]+zp, offset_z[iB]+zp, offset_z[iC]+zp+1, offset_z[iD]+zp+1}
|
|
|
|
local bounds = {}
|
|
local xmin = math.max(math.floor(blocksize*math.min(unpack(poly_x)))+1, minp.x)
|
|
local xmax = math.min(math.floor(blocksize*math.max(unpack(poly_x))), maxp.x)
|
|
for x=xmin, xmax do
|
|
bounds[x] = {}
|
|
end
|
|
|
|
local i1 = 4
|
|
for i2=1, 4 do -- Loop on 4 edges
|
|
local x1, x2 = poly_x[i1], poly_x[i2]
|
|
local lxmin = math.floor(blocksize*math.min(x1, x2))+1
|
|
local lxmax = math.floor(blocksize*math.max(x1, x2))
|
|
if lxmin <= lxmax then
|
|
local z1, z2 = poly_z[i1], poly_z[i2]
|
|
local a = (z1-z2) / (x1-x2)
|
|
local b = blocksize*(z1 - a*x1)
|
|
for x=math.max(lxmin, minp.x), math.min(lxmax, maxp.x) do
|
|
table.insert(bounds[x], a*x+b)
|
|
end
|
|
end
|
|
i1 = i2
|
|
end
|
|
for x=xmin, xmax do
|
|
local xlist = bounds[x]
|
|
table.sort(xlist)
|
|
local c = math.floor(#xlist/2)
|
|
for l=1, c do
|
|
local zmin = math.max(math.floor(xlist[l*2-1])+1, minp.z)
|
|
local zmax = math.min(math.floor(xlist[l*2]), maxp.z)
|
|
local i = (x-minp.x) * chulens + (zmin-minp.z) + 1
|
|
for z=zmin, zmax do
|
|
polygon_number[i] = n
|
|
i = i + 1
|
|
n_filled = n_filled + 1
|
|
end
|
|
end
|
|
end
|
|
|
|
polygons[n] = {x=poly_x, z=poly_z, i={iA, iB, iC, iD}}
|
|
n = n + 1
|
|
end
|
|
end
|
|
|
|
local i = 1
|
|
for x = minp.x, maxp.x do
|
|
for z = minp.z, maxp.z do
|
|
local npoly = polygon_number[i]
|
|
if npoly then
|
|
local poly = polygons[npoly]
|
|
local xf, zf = geometry.transform_quadri(poly.x, poly.z, x/blocksize, z/blocksize)
|
|
if xf < 0 or xf > 1 or zf < 0 or zf > 1 then
|
|
print(xf, zf, x, z)
|
|
end
|
|
local i00, i01, i11, i10 = unpack(poly.i)
|
|
|
|
local terrain_height = math.floor(interp(
|
|
dem[i00],
|
|
dem[i01],
|
|
dem[i10],
|
|
dem[i11],
|
|
xf, zf
|
|
))
|
|
|
|
local lake_height = math.floor(math.min(
|
|
lakes[i00],
|
|
lakes[i01],
|
|
lakes[i10],
|
|
lakes[i11]
|
|
))
|
|
|
|
local is_lake = lake_height > terrain_height
|
|
|
|
local is_river = false
|
|
if xf < 1/6 then
|
|
if links[i00] == 1 and rivers[i00] >= min_catchment then
|
|
is_river = true
|
|
elseif links[i10] == 3 and rivers[i10] >= min_catchment then
|
|
is_river = true
|
|
end
|
|
end
|
|
|
|
if zf < 1/6 then
|
|
if links[i00] == 2 and rivers[i00] >= min_catchment then
|
|
is_river = true
|
|
elseif links[i01] == 4 and rivers[i01] >= min_catchment then
|
|
is_river = true
|
|
end
|
|
end
|
|
|
|
local ivm = a:index(x, minp.y-1, z)
|
|
|
|
if terrain_height >= minp.y then
|
|
for y=minp.y, math.min(maxp.y, terrain_height) do
|
|
if y == terrain_height then
|
|
if is_lake or y <= sea_level then
|
|
data[ivm] = c_sand
|
|
elseif is_river then
|
|
data[ivm] = c_rwater
|
|
else
|
|
data[ivm] = c_lawn
|
|
end
|
|
else
|
|
data[ivm] = c_stone
|
|
end
|
|
ivm = ivm + ystride
|
|
end
|
|
end
|
|
|
|
if lake_height > sea_level then
|
|
if is_lake and lake_height > minp.y then
|
|
for y=math.max(minp.y, terrain_height+1), math.min(maxp.y, lake_height) do
|
|
data[ivm] = c_rwater
|
|
ivm = ivm + ystride
|
|
end
|
|
end
|
|
else
|
|
for y=math.max(minp.y, terrain_height+1), math.min(maxp.y, sea_level) do
|
|
data[ivm] = c_water
|
|
ivm = ivm + ystride
|
|
end
|
|
end
|
|
end
|
|
i = i + 1
|
|
end
|
|
end
|
|
|
|
vm:set_data(data)
|
|
minetest.generate_ores(vm, minp, maxp)
|
|
vm:set_lighting({day = 0, night = 0})
|
|
vm:calc_lighting()
|
|
vm:update_liquids()
|
|
vm:write_to_map()
|
|
end
|
|
|
|
minetest.register_on_generated(generate)
|