302 lines
7.4 KiB
Lua
302 lines
7.4 KiB
Lua
-- Parameters
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local YWATER = 1 -- y of water level
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local YSURF = 4 -- y of surface centre and top of beach
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local TERSCA = 128 -- Terrain vertical scale in nodes
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local TSTONE = 0.04 -- Stone density threshold, depth of sand or biome nodes
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local DEBUG = false
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-- 3D noise
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local np_terrain = {
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offset = 0,
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scale = 1,
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spread = {x = 384, y = 192, z = 384},
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seed = 5900033,
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octaves = 5,
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persist = 0.63,
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lacunarity = 2.0,
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--flags = ""
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}
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-- 2D noise
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local np_biome = {
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offset = 0,
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scale = 1,
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spread = {x = 512, y = 512, z = 512},
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seed = -188900,
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octaves = 3,
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persist = 0.4,
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lacunarity = 2.0,
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--flags = ""
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}
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-- Nodes
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minetest.register_node("stability:grass", {
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description = "Grass",
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tiles = {"default_grass.png", "default_dirt.png", "default_grass.png"},
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groups = {crumbly = 3},
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sounds = default.node_sound_dirt_defaults({
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footstep = {name = "default_grass_footstep", gain = 0.25},
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}),
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})
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minetest.register_node("stability:dirt", {
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description = "Dirt",
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tiles = {"default_dirt.png"},
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groups = {crumbly = 3},
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sounds = default.node_sound_dirt_defaults(),
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})
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-- Set mapgen parameters
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minetest.set_mapgen_params({mgname = "singlenode",
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flags = "nolight", water_level = YWATER})
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-- Constants
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local c_air = minetest.CONTENT_AIR
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local c_ignore = minetest.CONTENT_IGNORE
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local c_stone = minetest.get_content_id("default:stone")
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local c_destone = minetest.get_content_id("default:desert_stone")
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local c_sand = minetest.get_content_id("default:sand")
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local c_desand = minetest.get_content_id("default:desert_sand")
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local c_dirtsnow = minetest.get_content_id("default:dirt_with_snow")
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local c_water = minetest.get_content_id("default:water_source")
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local c_grass = minetest.get_content_id("stability:grass")
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local c_dirt = minetest.get_content_id("stability:dirt")
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-- Initialize noise objects to nil
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local nobj_terrain = nil
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local nobj_biome = nil
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-- Localise noise buffers
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local nbuf_terrain
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local nbuf_biome
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-- Localise data buffer
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local dbuf
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-- On generated function
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minetest.register_on_generated(function(minp, maxp, seed)
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local t0 = os.clock()
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local x1 = maxp.x
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local y1 = maxp.y
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local z1 = maxp.z
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local x0 = minp.x
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local y0 = minp.y
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local z0 = minp.z
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local sidelen = x1 - x0 + 1
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local ystridevm = sidelen + 32 -- strides for voxelmanip
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local zstridevm = ystridevm ^ 2
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local ystridepm = sidelen + 2 -- strides for perlinmaps, densitymap, stability map
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local zstridepm = ystridepm ^ 2
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local chulens3d = {x = sidelen + 2, y = sidelen + 2, z = sidelen + 2}
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local chulens2d = {x = sidelen + 2, y = sidelen + 2, z = 1}
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local minpos3d = {x = x0 - 1, y = y0 - 1, z = z0 - 1}
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local minpos2d = {x = x0 - 1, y = z0 - 1}
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nobj_terrain = nobj_terrain or minetest.get_perlin_map(np_terrain, chulens3d)
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nobj_biome = nobj_biome or minetest.get_perlin_map(np_biome, chulens2d)
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local nvals_terrain = nobj_terrain:get3dMap_flat(minpos3d, nbuf_terrain)
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local nvals_biome = nobj_biome:get2dMap_flat(minpos2d, nbuf_biome)
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local dvals = {} -- 3D densitymap
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local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
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local area = VoxelArea:new{MinEdge = emin, MaxEdge = emax}
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local data = vm:get_data(dbuf)
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-- Place stone
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local ni3d = 1
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local ni2d = 1
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for z = z0 - 1, z1 + 1 do
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for y = y0 - 1, y1 + 1 do
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local vi = area:index(x0 - 1, y, z)
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for x = x0 - 1, x1 + 1 do
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local n_terrain = nvals_terrain[ni3d]
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local n_biome = nvals_biome[ni2d]
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local grad = (YSURF - y) / TERSCA
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local tstone = TSTONE
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if y < YSURF then -- make shore and seabed shallower
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grad = grad * 4
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tstone = TSTONE * 4
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end
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local density = n_terrain + grad
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dvals[ni3d] = density
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if density >= tstone then
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if n_biome > 0.4 then
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data[vi] = c_destone
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else
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data[vi] = c_stone
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end
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elseif y == y1 + 1 and x >= x0 and x <= x1 and z >= z0 and z <= z1 then
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data[vi] = c_air
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end
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ni3d = ni3d + 1
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ni2d = ni2d + 1
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vi = vi + 1
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end
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ni2d = ni2d - ystridepm
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end
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ni2d = ni2d + ystridepm
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end
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-- Place sub-surface biome nodes
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local stable = {} -- stability map
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for y = y0, y1 + 1 do
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local tstone = TSTONE
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if y < YSURF then
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tstone = TSTONE * 4
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end
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for z = z0, z1 do
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local vi = area:index(x0, y, z)
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local di = (z - z0 + 1) * zstridepm + -- densitymap index
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(y - y0 + 1) * ystridepm + 2 -- +2 because starting at x = x0
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local ni2d = (z - z0 + 1) * ystridepm + 2 -- biome noise and stability maps
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for x = x0, x1 do
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local density = dvals[di]
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local n_biome = nvals_biome[ni2d]
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if density >= tstone then -- existing stone
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stable[ni2d] = true
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elseif density >= 0 and (stable[ni2d] or y == y0) then -- biome layer
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local nodu = data[(vi - ystridevm)]
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local node = data[(vi - ystridevm + 1)]
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local nodw = data[(vi - ystridevm - 1)]
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local nodn = data[(vi - ystridevm + zstridevm)]
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local nods = data[(vi - ystridevm - zstridevm)]
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local nodne = data[(vi - ystridevm + zstridevm + 1)]
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local nodnw = data[(vi - ystridevm + zstridevm - 1)]
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local nodse = data[(vi - ystridevm - zstridevm + 1)]
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local nodsw = data[(vi - ystridevm - zstridevm - 1)]
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if y == y0 then -- also check for ignore
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if nodu == c_air or nodu == c_ignore
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or node == c_air or node == c_ignore
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or nodw == c_air or nodw == c_ignore
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or nodn == c_air or nodn == c_ignore
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or nods == c_air or nods == c_ignore
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or nodne == c_air or nodne == c_ignore
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or nodnw == c_air or nodnw == c_ignore
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or nodse == c_air or nodse == c_ignore
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or nodsw == c_air or nodsw == c_ignore then
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stable[ni2d] = false
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else
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stable[ni2d] = true
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end
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else
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if node == c_air
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or nodw == c_air
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or nodn == c_air
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or nods == c_air
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or nodne == c_air
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or nodnw == c_air
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or nodse == c_air
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or nodsw == c_air then
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stable[ni2d] = false
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end
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end
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if stable[ni2d] then
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if y <= YSURF then
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data[vi] = c_sand
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elseif n_biome > 0.4 then
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data[vi] = c_desand
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elseif n_biome < -0.4 then
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data[vi] = c_dirt
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else
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data[vi] = c_dirt
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end
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end
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else
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stable[ni2d] = false
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end
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vi = vi + 1
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di = di + 1
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ni2d = ni2d + 1
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end
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end
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end
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if y1 > YSURF then
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-- Place surface biome nodes
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for z = z0, z1 do
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local ni2d = (z - z0 + 1) * ystridepm + 2
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for x = x0, x1 do
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local aircount = 0
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local n_biome = nvals_biome[ni2d]
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local vi = area:index(x, y1 + 2, z)
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for y = y1 + 2, y0, -1 do
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if y <= YSURF then
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break
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end
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local nodid = data[vi]
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if nodid == c_air then
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aircount = aircount + 1
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elseif aircount >= 1 then -- surface found
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if nodid == c_dirt then
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if n_biome < -0.4 then
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data[vi] = c_dirtsnow
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else
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data[vi] = c_grass
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end
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end
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aircount = 0
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end
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vi = vi - ystridevm
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end
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ni2d = ni2d + 1
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end
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end
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end
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if y0 <= YWATER then
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-- Place water
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for z = z0, z1 do
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for y = y0, y1 do
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local vi = area:index(x0, y, z)
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for x = x0, x1 do
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if data[vi] == c_air and y <= YWATER then
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data[vi] = c_water
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end
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vi = vi + 1
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end
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end
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end
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end
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vm:set_data(data)
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vm:calc_lighting({x = x0, y = y0 - 1, z = z0}, {x = x1, y = y1 + 1, z = z1})
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vm:write_to_map(data)
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vm:update_liquids()
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if DEBUG then
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local chugent = math.ceil((os.clock() - t0) * 1000)
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print ("[stability] "..chugent.." ms")
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end
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end)
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