Initial commit

README.txt

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+riverexp 0.1.0 by paramat
+For Minetest 0.4.11 stable or later
+Depends default
+Licenses: Code WTFPL. Textures CC-BY-SA

depends.txt

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+default

init.lua

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+-- Parameters
+
+local YWATER = 1
+local YSAND = 4
+local YTERCEN = 0
+local TERSCA = 384
+local BASAMP = 0.2
+
+local TSTONE = 0.02
+local TRIVER = 0.007
+local VALAMP = 0.33
+local VALEXP = 1
+local RIVAMP = 1.5
+
+-- Noise parameters
+
+-- 2D noise
+
+local np_valleyhi = {
+	offset = 0,
+	scale = 1,
+	spread = {x=768, y=768, z=768},
+	seed = -100,
+	octaves = 5,
+	persist = 0.6,
+	lacunarity = 2.0,
+	--flags = ""
+}
+
+local np_valleyhi2 = {
+	offset = 0,
+	scale = 1,
+	spread = {x=768, y=768, z=768},
+	seed = 95556,
+	octaves = 5,
+	persist = 0.6,
+	lacunarity = 2.0,
+	--flags = ""
+}
+
+local np_valleylo = {
+	offset = 0,
+	scale = 1,
+	spread = {x=768, y=768, z=768},
+	seed = -100,
+	octaves = 3,
+	persist = 0.5,
+	lacunarity = 2.0,
+	--flags = ""
+}
+
+local np_valleylo2 = {
+	offset = 0,
+	scale = 1,
+	spread = {x=768, y=768, z=768},
+	seed = 95556,
+	octaves = 3,
+	persist = 0.5,
+	lacunarity = 2.0,
+	--flags = ""
+}
+
+local np_base = {
+	offset = 0,
+	scale = 1,
+	spread = {x=1536, y=1536, z=1536},
+	seed = 188,
+	octaves = 3,
+	persist = 0.4,
+	lacunarity = 2.0,
+	--flags = ""
+}
+
+--local np_ = {
+--	offset = 0,
+--	scale = 1,
+--	spread = {x=, y=, z=},
+--	seed = ,
+--	octaves = ,
+--	persist = 0.5,
+--	lacunarity = 2.0,
+--	--flags = ""
+--}
+
+-- Stuff
+
+dofile(minetest.get_modpath("riverexp").."/nodes.lua")
+
+-- Set mapgen parameters
+
+minetest.register_on_mapgen_init(function(mgparams)
+	minetest.set_mapgen_params({mgname="singlenode", flags="nolight"})
+end)
+
+-- Initialize noise objects to nil
+
+local nobj_valleyhi = nil
+local nobj_valleyhi2 = nil
+local nobj_valleylo = nil
+local nobj_valleylo2 = nil
+local nobj_base = nil
+
+-- On generated function
+
+minetest.register_on_generated(function(minp, maxp, seed)
+	local t0 = 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 ("[riverexp] 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_stone = minetest.get_content_id("default:stone")
+	local c_water = minetest.get_content_id("default:water_source")
+	local c_sand  = minetest.get_content_id("default:sand")
+	
+	local c_grass      = minetest.get_content_id("riverexp:grass")
+	local c_freshwater = minetest.get_content_id("riverexp:freshwater")
+
+	local sidelen = x1 - x0 + 1
+	local ystride = sidelen + 32
+	--local zstride = ystride ^ 2
+	--local chulens3d = {x=sidelen, y=sidelen+17, z=sidelen}
+	local chulens2d = {x=sidelen, y=sidelen, z=1}
+	--local minpos3d = {x=x0, y=y0-16, z=z0}
+	local minpos2d = {x=x0, y=z0}
+	
+	nobj_valleyhi = nobj_valleyhi or minetest.get_perlin_map(np_valleyhi, chulens2d)
+	local nvals_valleyhi = nobj_valleyhi:get2dMap_flat(minpos2d)
+
+	nobj_valleyhi2 = nobj_valleyhi2 or minetest.get_perlin_map(np_valleyhi2, chulens2d)
+	local nvals_valleyhi2 = nobj_valleyhi2:get2dMap_flat(minpos2d)
+
+	nobj_valleylo = nobj_valleylo or minetest.get_perlin_map(np_valleylo, chulens2d)
+	local nvals_valleylo = nobj_valleylo:get2dMap_flat(minpos2d)
+
+	nobj_valleylo2 = nobj_valleylo2 or minetest.get_perlin_map(np_valleylo2, chulens2d)
+	local nvals_valleylo2 = nobj_valleylo2:get2dMap_flat(minpos2d)
+
+	nobj_base = nobj_base or minetest.get_perlin_map(np_base, chulens2d)
+	local nvals_base = nobj_base:get2dMap_flat(minpos2d)
+
+	--nobj_ = nobj_ or minetest.get_perlin_map(np_, chulens2d)
+	--local nvals_ = nobj_:get2dMap_flat(minpos2d)
+
+	--local ni3d = 1
+	local ni2d = 1
+	for z = z0, z1 do
+		for y = y0 - 16, y1 + 1 do
+			local vi = area:index(x0, y, z)
+			for x = x0, x1 do
+
+				local n_base = nvals_base[ni2d]
+				local blend = math.min(math.max(n_base * 3 - 1, 0), 1)
+				local triver = TRIVER * (1 - blend * 0.5)
+				local valamp = VALAMP
+				local valexp = VALEXP
+
+				local n_valleylo = nvals_valleylo[ni2d]
+				local n_valleyhi = nvals_valleyhi[ni2d]
+				local n_valleymix = n_valleylo * (1 - blend) + n_valleyhi * blend
+
+				local n_valleylo2 = nvals_valleylo2[ni2d]
+				local n_valleyhi2 = nvals_valleyhi2[ni2d]
+				local n_valleymix2 = n_valleylo2 * (1 - blend) + n_valleyhi2 * blend
+
+				local grad = (YTERCEN - y) / TERSCA
+				local densitybase = n_base * BASAMP + grad
+				local densityval = math.abs(n_valleymix * n_valleymix2) - triver
+				if densityval > 0 then -- valley shape
+					densityval = densityval ^ valexp * valamp
+				else -- river channel shape
+					densityval = densityval * RIVAMP
+				end
+				local density = densityval + densitybase
+
+				if density >= TSTONE then
+					data[vi] = c_stone
+				elseif density > 0 and density < TSTONE then
+					if y <= YSAND or densitybase > 0.001 then
+						data[vi] = c_sand
+					else
+						data[vi] = c_grass
+					end
+				elseif y <= YWATER then
+					data[vi] = c_water
+				elseif densitybase > 0 then
+					data[vi] = c_freshwater
+				end
+
+				--ni3d = ni3d + 1
+				ni2d = ni2d + 1
+				vi = vi + 1
+			end
+			ni2d = ni2d - sidelen
+		end
+		ni2d = ni2d + sidelen
+	end
+	
+	vm:set_data(data)
+	vm:calc_lighting()
+	vm:write_to_map(data)
+	vm:update_liquids()
+
+	local chugent = math.ceil((os.clock() - t0) * 1000)
+	print ("[riverexp] "..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.
+                       

nodes.lua

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+minetest.register_node("riverexp:grass", {
+	description = "Grass",
+	tiles = {"default_grass.png", "default_dirt.png", "default_grass.png"},
+	groups = {crumbly=3},
+	sounds = default.node_sound_dirt_defaults({
+		footstep = {name="default_grass_footstep", gain=0.25},
+	}),
+})
+
+minetest.register_node("riverexp:freshwater", {
+	description = "Fresh Water Source",
+	inventory_image = minetest.inventorycube("riverexp_freshwater.png"),
+	drawtype = "liquid",
+	tiles = {
+		{
+			name="riverexp_freshwateranim.png",
+			animation={type="vertical_frames",
+			aspect_w=16, aspect_h=16, length=2.0}
+		}
+	},
+	special_tiles = {
+		{
+			name="riverexp_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 = "riverexp:freshwaterflow",
+	liquid_alternative_source = "riverexp:freshwater",
+	liquid_viscosity = WATER_VISC,
+	liquid_renewable = false,
+	liquid_range = 2,
+	post_effect_color = {a=64, r=100, g=150, b=200},
+	groups = {water=3, liquid=3, puts_out_fire=1},
+})
+
+minetest.register_node("riverexp:freshwaterflow", {
+	description = "Fresh Flowing Water",
+	inventory_image = minetest.inventorycube("riverexp_freshwater.png"),
+	drawtype = "flowingliquid",
+	tiles = {"riverexp_freshwater.png"},
+	special_tiles = {
+		{
+			image="riverexp_freshwaterflowanim.png",
+			backface_culling=false,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
+		{
+			image="riverexp_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 = "riverexp:freshwaterflow",
+	liquid_alternative_source = "riverexp:freshwater",
+	liquid_viscosity = WATER_VISC,
+	liquid_renewable = false,
+	liquid_range = 2,
+	post_effect_color = {a=64, r=100, g=130, b=200},
+	groups = {water=3, liquid=3, puts_out_fire=1, not_in_creative_inventory=1},
+})
+