First commit

README.txt

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+riverdev 0.1.0 by paramat
+For latest stable Minetest back to 0.4.8
+Depends default
+Licenses: code WTFPL

depends.txt

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+default

init.lua

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+-- riverdev 0.1.0 by paramat
+-- For latest stable Minetest and back to 0.4.8
+-- Depends default
+-- License: code WTFPL
+
+-- Parameters
+
+local YMIN = -33000
+local YMAX = 33000
+local YWATER = 1
+local TERZERO = 32 -- Terrain zero level
+local TERSCAL = 128 -- Terrain scale in nodes
+local TSTONE = 0.04 -- Density threshold for stone, depth of stone below surface
+local BASAMP = 0.4
+local MIDAMP = 0.4
+local TERAMP = 0.4
+local TRIVER = -0.04
+local TSTREAM = -0.02
+
+-- 3D noise for terrain
+
+local np_terrain = {
+	offset = 0,
+	scale = 1,
+	spread = {x=384, y=384, z=384}, -- squashed perlin noise, y spread is half
+	seed = 5900033,
+	octaves = 5,
+	persist = 0.63
+}
+
+-- 2D noise for mid terrain
+
+local np_mid = {
+	offset = 0,
+	scale = 1,
+	spread = {x=768, y=768, z=768}, -- spread is still stated with xyz values
+	seed = 85546,
+	octaves = 4,
+	persist = 0.5
+}
+
+-- 2D noise for base terrain
+
+local np_base = {
+	offset = 0,
+	scale = 1,
+	spread = {x=1536, y=1536, z=1536}, -- spread is still stated with xyz values
+	seed = -990054,
+	octaves = 3,
+	persist = 0.4
+}
+
+-- Stuff
+
+riverdev = {}
+
+minetest.register_on_mapgen_init(function(mgparams)
+	minetest.set_mapgen_params({mgname="singlenode"})
+end)
+
+-- Nodes
+
+minetest.register_node("riverdev:stone", {
+	description = "Stone",
+	tiles = {"default_stone.png"},
+	is_ground_content = false,
+	groups = {cracky=3},
+	drop = "default:cobble",
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("riverdev:freshwater", {
+	description = "Fresh Water Source",
+	inventory_image = minetest.inventorycube("riverdev_freshwater.png"),
+	drawtype = "liquid",
+	tiles = {
+		{
+			name="riverdev_freshwateranim.png",
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=2.0}
+		}
+	},
+	special_tiles = {
+		{
+			name="riverdev_freshwateranim.png",
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=2.0},
+			backface_culling = false,
+		}
+	},
+	alpha = WATER_ALPHA,
+	paramtype = "light",
+	is_ground_content = false,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drop = "",
+	drowning = 1,
+	liquidtype = "source",
+	liquid_alternative_flowing = "riverdev:freshwaterflow",
+	liquid_alternative_source = "riverdev:freshwater",
+	liquid_viscosity = WATER_VISC,
+	liquid_renewable = false,
+	liquid_range = 0,
+	post_effect_color = {a=64, r=100, g=150, b=200},
+	groups = {water=3, liquid=3, puts_out_fire=1},
+})
+
+minetest.register_node("riverdev:freshwaterflow", {
+	description = "Fresh Flowing Water",
+	inventory_image = minetest.inventorycube("riverdev_freshwater.png"),
+	drawtype = "flowingliquid",
+	tiles = {"riverdev_freshwater.png"},
+	special_tiles = {
+		{
+			image="riverdev_freshwaterflowanim.png",
+			backface_culling=false,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
+		{
+			image="riverdev_freshwaterflowanim.png",
+			backface_culling=true,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
+	},
+	alpha = WATER_ALPHA,
+	paramtype = "light",
+	paramtype2 = "flowingliquid",
+	is_ground_content = false,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drop = "",
+	drowning = 1,
+	liquidtype = "flowing",
+	liquid_alternative_flowing = "riverdev:freshwaterflow",
+	liquid_alternative_source = "riverdev:freshwater",
+	liquid_viscosity = WATER_VISC,
+	liquid_renewable = false,
+	liquid_range = 0,
+	post_effect_color = {a=64, r=100, g=150, b=200},
+	groups = {water=3, liquid=3, puts_out_fire=1, not_in_creative_inventory=1},
+})
+
+-- On generated function
+
+minetest.register_on_generated(function(minp, maxp, seed)
+	if minp.y < YMIN or maxp.y > YMAX then
+		return
+	end
+
+	local t1 = os.clock()
+	local x1 = maxp.x
+	local y1 = maxp.y
+	local z1 = maxp.z
+	local x0 = minp.x
+	local y0 = minp.y
+	local z0 = minp.z
+	
+	print ("[riverdev] chunk minp ("..x0.." "..y0.." "..z0..")")
+	
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
+	local data = vm:get_data()
+	
+	local c_air = minetest.get_content_id("air")
+	local c_water = minetest.get_content_id("default:water_source")
+	local c_sand = minetest.get_content_id("default:sand")
+	local c_stone = minetest.get_content_id("riverdev:stone")
+	local c_freshwater = minetest.get_content_id("riverdev:freshwater")
+	
+	local sidelen = x1 - x0 + 1
+	local chulens = {x=sidelen, y=sidelen, z=sidelen}
+	local minposxyz = {x=x0, y=y0, z=z0}
+	local minposxz = {x=x0, y=z0}
+	
+	local nvals_terrain = minetest.get_perlin_map(np_terrain, chulens):get3dMap_flat(minposxyz)
+	
+	local nvals_mid = minetest.get_perlin_map(np_mid, chulens):get2dMap_flat(minposxz)
+	local nvals_base = minetest.get_perlin_map(np_base, chulens):get2dMap_flat(minposxz)
+	
+	local nixyz = 1 -- 3D noise index
+	local nixz = 1 -- 2D noise index
+	local stable = {}
+	for z = z0, z1 do
+		for x = x0, x1 do
+			local si = x - x0 + 1
+			local nodename = minetest.get_node({x=x,y=y0-1,z=z}).name
+			if nodename == "air"
+			or nodename == "default:water_source"
+			or nodename == "riverdev:freshwater"
+			or nodename == "riverdev:freshwaterflow" then
+				stable[si] = 0
+			else
+				stable[si] = 2
+			end
+		end
+		for y = y0, y1 do
+			local vi = area:index(x0, y, z)
+			for x = x0, x1 do
+				local si = x - x0 + 1
+				local n_terrain = nvals_terrain[nixyz]
+				local n_mid = nvals_mid[nixz]
+				local n_base = nvals_base[nixz]
+				
+				local grad = (TERZERO - y) / TERSCAL
+				local densitybas = n_base * BASAMP + grad
+				local densitymid = math.abs(n_mid) * MIDAMP + densitybas
+				local density = math.abs(n_terrain) * TERAMP * math.abs(n_mid) + densitymid
+				
+				if density >= TSTONE then -- stone
+					data[vi] = c_stone
+					stable[si] = stable[si] + 1
+				elseif density >= 0 and density < TSTONE and stable[si] >= 2 then -- fine materials
+					data[vi] = c_sand
+				elseif y <= YWATER and density < TSTONE then -- sea water
+					data[vi] = c_water
+					stable[si] = 0
+				elseif densitybas >= TRIVER then -- river water
+					data[vi] = c_freshwater
+					stable[si] = 0
+				elseif densitymid >= TSTREAM then -- stream water
+					data[vi] = c_freshwater
+					stable[si] = 0
+				else -- air
+					stable[si] = 0
+				end
+				
+				
+				nixyz = nixyz + 1 -- increment 3D noise index
+				nixz = nixz + 1 -- increment 2D noise index
+				vi = vi + 1
+			end
+			nixz = nixz - 80 -- rewind 2D noise index by 80 nodes for next x row above
+		end
+		nixz = nixz + 80 -- fast-forward 2D noise index by 80 nodes for next northward xy plane
+	end
+	
+	vm:set_data(data)
+	vm:set_lighting({day=0, night=0})
+	vm:calc_lighting()
+	vm:write_to_map(data)
+	local chugent = math.ceil((os.clock() - t1) * 1000)
+	print ("[riverdev] "..chugent.." ms")
+end)

license.txt

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+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.
+