From 108c280843c8a544dba0300fabadff9e81a7002e Mon Sep 17 00:00:00 2001
From: Starbeamrainbowlabs <sbrl@starbeamrainbowlabs.com>
Date: Mon, 1 Mar 2021 21:26:33 +0000
Subject: [PATCH] Start laying out stuff for our noise experiment, but it isn't
 hooked up yet and isn't finished.

---
 worldeditadditions/lib/noise/engines.lua |  3 ++
 worldeditadditions/lib/noise/make_2d.lua |  9 ++++++
 worldeditadditions/lib/noise/noise.lua   |  3 ++
 worldeditadditions/lib/noise/noise2d.lua | 38 ++++++++++++++++++++++++
 4 files changed, 53 insertions(+)
 create mode 100644 worldeditadditions/lib/noise/engines.lua
 create mode 100644 worldeditadditions/lib/noise/make_2d.lua
 create mode 100644 worldeditadditions/lib/noise/noise.lua
 create mode 100644 worldeditadditions/lib/noise/noise2d.lua

diff --git a/worldeditadditions/lib/noise/engines.lua b/worldeditadditions/lib/noise/engines.lua
new file mode 100644
index 0000000..7d172fd
--- /dev/null
+++ b/worldeditadditions/lib/noise/engines.lua
@@ -0,0 +1,3 @@
+function worldeditadditions.noise.engine_perlin_2d(x, y)
+	
+end
diff --git a/worldeditadditions/lib/noise/make_2d.lua b/worldeditadditions/lib/noise/make_2d.lua
new file mode 100644
index 0000000..9810d44
--- /dev/null
+++ b/worldeditadditions/lib/noise/make_2d.lua
@@ -0,0 +1,9 @@
+
+-- ███    ███  █████  ██   ██ ███████         ██████  ██████
+-- ████  ████ ██   ██ ██  ██  ██                   ██ ██   ██
+-- ██ ████ ██ ███████ █████   █████            █████  ██   ██
+-- ██  ██  ██ ██   ██ ██  ██  ██              ██      ██   ██
+-- ██      ██ ██   ██ ██   ██ ███████ ███████ ███████ ██████
+function worldeditadditions.noise.make_2d(size, noise_func)
+	-- TODO: Follow https://www.redblobgames.com/maps/terrain-from-noise/
+end
diff --git a/worldeditadditions/lib/noise/noise.lua b/worldeditadditions/lib/noise/noise.lua
new file mode 100644
index 0000000..30b2549
--- /dev/null
+++ b/worldeditadditions/lib/noise/noise.lua
@@ -0,0 +1,3 @@
+worldeditadditions.noise = {}
+
+dofile(worldeditadditions.modpath.."/lib/noise/alg_perlin.lua")
diff --git a/worldeditadditions/lib/noise/noise2d.lua b/worldeditadditions/lib/noise/noise2d.lua
new file mode 100644
index 0000000..5661628
--- /dev/null
+++ b/worldeditadditions/lib/noise/noise2d.lua
@@ -0,0 +1,38 @@
+--- Applies a layer of 2D noise over the terrain in the defined region.
+-- @module worldeditadditions.noise2d
+
+-- ███    ██  ██████  ██ ███████ ███████ ██████  ██████
+-- ████   ██ ██    ██ ██ ██      ██           ██ ██   ██
+-- ██ ██  ██ ██    ██ ██ ███████ █████    █████  ██   ██
+-- ██  ██ ██ ██    ██ ██      ██ ██      ██      ██   ██
+-- ██   ████  ██████  ██ ███████ ███████ ███████ ██████
+--- Applies a layer of 2d noise over the terrain in the defined region.
+-- @param	pos1			Vector	pos1 of the defined region
+-- @param	pos2			Vector	pos2 of the defined region
+-- @param	noise_params	table	A noise parameters table. Will be passed unmodified to PerlinNoise() from the Minetest API.
+function worldeditadditions.noise2d(pos1, pos2, noise_params)
+	pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+	-- pos2 will always have the highest co-ordinates now
+	
+	-- Fetch the nodes in the specified area
+	local manip, area = worldedit.manip_helpers.init(pos1, pos2)
+	local data = manip:get_data()
+	
+	local heightmap_old, heightmap_size = worldeditadditions.make_heightmap(
+		pos1, pos2,
+		manip, area,
+		data
+	)
+	local heightmap_new = worldeditadditions.shallowcopy(heightmap_old)
+	
+	local perlin_map = PerlinNoiseMap(noise_params, heightmap_size)
+	
+	
+	local stats = { added = 0, removed = 0 }
+	
+	-- Save the modified nodes back to disk & return
+	-- No need to save - this function doesn't actually change anything
+	worldedit.manip_helpers.finish(manip, data)
+	
+	return true, stats
+end