watershed/functions.lua

function watershed_appletree(x, y, z, area, data)
	local c_tree = minetest.get_content_id("default:tree")
	local c_apple = minetest.get_content_id("default:apple")
	local c_wsappleaf = minetest.get_content_id("watershed:appleleaf")
	for j = -2, 4 do
		if j >= 1 then
			for i = -2, 2 do
			for k = -2, 2 do
				local vil = area:index(x + i, y + j + 1, z + k)
				if math.random(48) == 2 then
					data[vil] = c_apple
				elseif math.random(5) ~= 2 then
					data[vil] = c_wsappleaf
				end
			end
			end
		end
		local vit = area:index(x, y + j, z)
		data[vit] = c_tree
	end
end

function watershed_pinetree(x, y, z, area, data)
	local c_tree = minetest.get_content_id("default:tree")
	local c_wsneedles = minetest.get_content_id("watershed:needles")
	local c_snowblock = minetest.get_content_id("default:snowblock")
	for j = -4, 14 do
		if j == 3 or j == 6 or j == 9 or j == 12 then
			for i = -2, 2 do
			for k = -2, 2 do
				if math.abs(i) == 2 or math.abs(k) == 2 then
					if math.random(7) ~= 2 then
						local vil = area:index(x + i, y + j, z + k)
						data[vil] = c_wsneedles
						local vila = area:index(x + i, y + j + 1, z + k)
						data[vila] = c_snowblock
					end
				end
			end
			end
		elseif j == 4 or j == 7 or j == 10 then
			for i = -1, 1 do
			for k = -1, 1 do
				if not (i == 0 and j == 0) then
					if math.random(11) ~= 2 then
						local vil = area:index(x + i, y + j, z + k)
						data[vil] = c_wsneedles
						local vila = area:index(x + i, y + j + 1, z + k)
						data[vila] = c_snowblock
					end
				end
			end
			end
		elseif j == 13 then
			for i = -1, 1 do
			for k = -1, 1 do
				if not (i == 0 and j == 0) then
					local vil = area:index(x + i, y + j, z + k)
					data[vil] = c_wsneedles
					local vila = area:index(x + i, y + j + 1, z + k)
					data[vila] = c_wsneedles
					local vilaa = area:index(x + i, y + j + 2, z + k)
					data[vilaa] = c_snowblock
				end
			end
			end
		end
		local vit = area:index(x, y + j, z)
		data[vit] = c_tree
	end
	local vil = area:index(x, y + 15, z)
	local vila = area:index(x, y + 16, z)
	local vilaa = area:index(x, y + 17, z)
	data[vil] = c_wsneedles
	data[vila] = c_wsneedles
	data[vilaa] = c_snowblock
end

function watershed_jungletree(x, y, z, area, data)
	local c_juntree = minetest.get_content_id("default:jungletree")
	local c_wsjunleaf = minetest.get_content_id("watershed:jungleleaf")
	local c_vine = minetest.get_content_id("watershed:vine")
	local top = math.random(17,23)
	local branch = math.floor(top * 0.6)
	for j = -5, top do
		if j == top or j == top - 1 or j == branch + 1 or j == branch + 2 then
			for i = -2, 2 do -- leaves
			for k = -2, 2 do
				local vi = area:index(x + i, y + j, z + k)
				if math.random(5) ~= 2 then
					data[vi] = c_wsjunleaf
				end
			end
			end
		elseif j <= -1 or j == top - 2 or j == branch then -- branches, roots
			for i = -1, 1 do
			for k = -1, 1 do
				if math.abs(i) + math.abs(k) == 2 then
					local vi = area:index(x + i, y + j, z + k)
					data[vi] = c_juntree
				end
			end
			end
		end
		if j >= 0 and j <= top - 3 then -- climbable nodes
			for i = -1, 1 do
			for k = -1, 1 do
				if math.abs(i) + math.abs(k) == 1 then
					local vi = area:index(x + i, y + j, z + k)
					data[vi] = c_vine
				end
			end
			end
		end
		if j >= -1 and j <= top - 3 then -- trunk
			local vi = area:index(x, y + j, z)
			data[vi] = c_juntree
		end
	end
end

function watershed_acaciatree(x, y, z, area, data)
	local c_tree = minetest.get_content_id("default:tree")
	local c_wsaccleaf = minetest.get_content_id("watershed:acacialeaf")
	for j = -3, 6 do
		if j == 6 then
			for i = -4, 4 do
			for k = -4, 4 do
				if not (i == 0 or k == 0) then
					if math.random(7) ~= 2 then
						local vil = area:index(x + i, y + j, z + k)
						data[vil] = c_wsaccleaf
					end
				end
			end
			end
		elseif j == 5 then
			for i = -2, 2, 4 do
			for k = -2, 2, 4 do
				local vit = area:index(x + i, y + j, z + k)
				data[vit] = c_tree
			end
			end
		elseif j == 4 then
			for i = -1, 1 do
			for k = -1, 1 do
				if math.abs(i) + math.abs(k) == 2 then
					local vit = area:index(x + i, y + j, z + k)
					data[vit] = c_tree
				end
			end
			end
		else
			local vit = area:index(x, y + j, z)
			data[vit] = c_tree
		end
	end
end

function watershed_flower(data, vi, noise)
	local c_danwhi = minetest.get_content_id("flowers:dandelion_white")
	local c_danyel = minetest.get_content_id("flowers:dandelion_yellow")
	local c_rose = minetest.get_content_id("flowers:rose")
	local c_tulip = minetest.get_content_id("flowers:tulip")
	local c_geranium = minetest.get_content_id("flowers:geranium")
	local c_viola = minetest.get_content_id("flowers:viola")
	if noise > 0.8 then
		data[vi] = c_danwhi
	elseif noise > 0.4 then
		data[vi] = c_rose
	elseif noise > 0 then
		data[vi] = c_tulip
	elseif noise > -0.4 then
		data[vi] = c_danyel
	elseif noise > -0.8 then
		data[vi] = c_geranium
	else
		data[vi] = c_viola
	end
end

function watershed_cactus(x, y, z, area, data)
	local c_wscactus = minetest.get_content_id("watershed:cactus")
	for j = -2, 4 do
	for i = -2, 2 do
		if i == 0 or j == 2 or (j == 3 and math.abs(i) == 2) then
			local vic = area:index(x + i, y + j, z)
			data[vic] = c_wscactus
		end
	end
	end
end

function watershed_papyrus(x, y, z, area, data)
	local c_papyrus = minetest.get_content_id("default:papyrus")
	local ph = math.random(1, 4)
	for j = 1, ph do
		local vip = area:index(x, y + j, z)
		data[vip] = c_papyrus
	end
end

-- Register buckets, lava fuel

bucket.register_liquid(
	"watershed:water",
	"watershed:waterflow",
	"watershed:bucket_water",
	"watershed_bucketwater.png",
	"WS Water Bucket"
)

bucket.register_liquid(
	"watershed:lava",
	"watershed:lavaflow",
	"watershed:bucket_lava",
	"bucket_lava.png",
	"WS Lava Bucket"
)

minetest.register_craft({
	type = "fuel",
	recipe = "watershed:bucket_lava",
	burntime = 60,
	replacements = {{"watershed:bucket_lava", "bucket:bucket_empty"}},
})

-- Lavacooling

minetest.register_abm({
	nodenames = {"watershed:lavaflow"},
	neighbors = {"group:water"},
	interval = 1,
	chance = 11,
	action = function(pos, node, active_object_count, active_object_count_wider)
		minetest.set_node(pos, {name="watershed:stone"})
		minetest.sound_play("default_cool_lava", {pos = pos,  gain = 0.25})
	end,
})

minetest.register_abm({
	nodenames = {"watershed:lava"},
	neighbors = {"group:water"},
	interval = 1,
	chance = 11,
	action = function(pos, node, active_object_count, active_object_count_wider)
		minetest.set_node(pos, {name="default:obsidian"})
		minetest.sound_play("default_cool_lava", {pos = pos,  gain = 0.25})
	end,
})

-- Set mapgen parameters

minetest.register_on_mapgen_init(function(mgparams)
	minetest.set_mapgen_params({mgname="singlenode", flags = "nolight", flagmask = "nolight"})
end)

-- Spawn player

function spawnplayer(player)
	local TERCEN = -160 -- Terrain 'centre', average seabed level
	local TERSCA = 512 -- Vertical terrain scale
	local ATANAMP = 1.1 -- Arctan function amplitude, smaller = more and larger floatlands above ridges
	local XLSAMP = 0.2 -- Extra large scale height variation amplitude
	local BASAMP = 0.4 -- Base terrain amplitude
	local CANAMP = 0.4 -- Canyon terrain amplitude
	local CANEXP = 1.33 -- Canyon shape exponent
	local xsp
	local ysp
	local zsp
	local np_rough = {
		offset = 0,
		scale = 1,
		spread = {x=512, y=512, z=512},
		seed = 593,
		octaves = 6,
		persist = 0.63
	}
	local np_smooth = {
		offset = 0,
		scale = 1,
		spread = {x=512, y=512, z=512},
		seed = 593,
		octaves = 6,
		persist = 0.3
	}
	local np_fault = {
		offset = 0,
		scale = 1,
		spread = {x=512, y=1024, z=512},
		seed = 14440002,
		octaves = 6,
		persist = 0.5
	}
	local np_base = {
		offset = 0,
		scale = 1,
		spread = {x=4096, y=4096, z=4096},
		seed = 8890,
		octaves = 4,
		persist = 0.4
	}
	local np_xlscale = {
		offset = 0,
		scale = 1,
		spread = {x=8192, y=8192, z=8192},
		seed = -72,
		octaves = 3,
		persist = 0.4
	}
	for chunk = 1, 32 do
		print ("[watershed] chunk "..chunk)
		local x0 = 80 * math.random(-24, 24) - 32
		local z0 = 80 * math.random(-24, 24) - 32
		local y0 = -32
		local x1 = x0 + 79
		local z1 = z0 + 79
		local y1 = 47
		
		local sidelen = 80
		local chulens = {x=sidelen, y=sidelen, z=sidelen}
		local minposxyz = {x=x0, y=y0, z=z0}
		local minposxz = {x=x0, y=z0}
	
		local nvals_rough = minetest.get_perlin_map(np_rough, chulens):get3dMap_flat(minposxyz)
		local nvals_smooth = minetest.get_perlin_map(np_smooth, chulens):get3dMap_flat(minposxyz)
		local nvals_fault = minetest.get_perlin_map(np_fault, chulens):get3dMap_flat(minposxyz)
	
		local nvals_base = minetest.get_perlin_map(np_base, chulens):get2dMap_flat(minposxz)
		local nvals_xlscale = minetest.get_perlin_map(np_xlscale, chulens):get2dMap_flat(minposxz)
		
		local nixz = 1
		local nixyz = 1
		for z = z0, z1 do
			for y = y0, y1 do
				for x = x0, x1 do
					local grad = math.atan((TERCEN - y) / TERSCA) * ATANAMP
					local n_base = nvals_base[nixz]
					local terblen = math.max(1 - math.abs(n_base), 0)
					local densitybase = (1 - math.abs(n_base)) * BASAMP + nvals_xlscale[nixz] * XLSAMP + grad
					local density
					if nvals_fault[nixyz] >= 0 then
						density = densitybase
						+ math.abs(nvals_rough[nixyz] * terblen
						+ nvals_smooth[nixyz] * (1 - terblen)) ^ CANEXP * CANAMP
					else	
						density = densitybase
						+ math.abs(nvals_rough[nixyz] * terblen
						- nvals_smooth[nixyz] * (1 - terblen)) ^ CANEXP * CANAMP
					end
					if y >= 1 and density > -0.01 and density < 0 then
						ysp = y
						xsp = x
						zsp = z
						break
					end
					nixz = nixz + 1
					nixyz = nixyz + 1
				end
				if ysp then
					break
				end
				nixz = nixz - 80
			end
			if ysp then
				break
			end
			nixz = nixz + 80
		end
		if ysp then
			break
		end
	end
	print ("[watershed] spawn player ("..xsp.." "..ysp.." "..zsp..")")
	player:setpos({x=xsp, y=ysp, z=zsp})
end

minetest.register_on_newplayer(function(player)
	spawnplayer(player)
end)

minetest.register_on_respawnplayer(function(player)
	spawnplayer(player)
	return true
end)