From f643ce07008ea327e1e7a730bd4c4e9e7612755a Mon Sep 17 00:00:00 2001
From: evrooije <evrooije@outlook.com>
Date: Sun, 15 Jul 2018 23:42:46 +0200
Subject: [PATCH] Further tweaking of the skyrock and bedrock layers, fixes in
 lighting and another refactoring with a first cut of a multi_map class and
 API

---
 init.lua   | 27 +++++++++++++++++++++++++++
 mapgen.lua | 17 +++++++++++------
 2 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/init.lua b/init.lua
index 0844e42..61178c3 100644
--- a/init.lua
+++ b/init.lua
@@ -1,11 +1,38 @@
+multi_map = {}
+
+multi_map.number_of_layers = 32
+multi_map.day_light = 15
+multi_map.night_light = 0
+multi_map.bedrock = "multi_map:bedrock"
+multi_map.skyrock = "multi_map:skyrock"
+multi_map.water_height = 0
+multi_map.seed = 835726
+
+multi_map.layer_height = 65535 / multi_map.number_of_layers
+multi_map.half_layer_height = multi_map.layer_height / 2
+
+function multi_map.get_current_layer(y)
+	for l = (multi_map.number_of_layers / -2), (multi_map.number_of_layers / 2) do
+		if y >= (l * layer_height) - half_layer_height and y < (l * layer_height) + half_layer_height then
+			return l
+		end
+	end
+end
+
+function multi_map.get_offset_y(y)
+	return y - (multi_map.get_current_layer(y) * multi_map.layer_height)
+end
+
 minetest.register_node("multi_map:skyrock", {
 	description = "Multi Map Impenetrable Skyblock",
 	drawtype = "airlike",
 	is_ground_content = false,
+	sunlight_propagates = true,
 	walkable = true,
 	pointable = false,
 	diggable = false,
 	climbable = false,
+	paramtype = "light",
 })
 
 minetest.register_node("multi_map:bedrock", {
diff --git a/mapgen.lua b/mapgen.lua
index 77ebc58..6a8b65e 100644
--- a/mapgen.lua
+++ b/mapgen.lua
@@ -202,6 +202,7 @@ minetest.register_on_generated(function(minp, maxp)
 	local nixz = 1
 
 	local worm_started = false
+	local supress_shadow = false
 
 	for z = minp.z, maxp.z do
 		local niz
@@ -216,10 +217,11 @@ minetest.register_on_generated(function(minp, maxp)
 					height = height + layers[current_layer].mountain_peak_2dmap[nixz]
 				end
 
-				if (layer_height * current_layer) - half_layer_height <= y and y <= (layer_height * current_layer) - half_layer_height + (sidelen / 2) then
+				if (layer_height * current_layer) + half_layer_height < y and y <= (layer_height * current_layer) + half_layer_height + sidelen then
 					vm_data[vi] = c_bedrock
-				elseif (layer_height * current_layer) + half_layer_height - (sidelen * 5) <= y and y <= (layer_height * current_layer) + half_layer_height then
+				elseif (layer_height * current_layer) + half_layer_height - (sidelen * 2) <= y and y <= (layer_height * current_layer) + half_layer_height then
 					vm_data[vi] = c_skyrock
+					supress_shadow = true
 				elseif y <= height + (layer_height * current_layer) then
 --					if math.abs(cave_3dmap[nixyz]) < 10 then -- + (y / 400) then
 						vm_data[vi] = c_stone
@@ -244,10 +246,13 @@ minetest.register_on_generated(function(minp, maxp)
 		nixz = nixz + sidelen
 	end
 
-
 	vm:set_data(vm_data)
-	vm:set_lighting({day=settings.day_light, night=settings.night_light})
 	vm:update_liquids()
-	vm:calc_lighting(false)
-	vm:write_to_map()
+	if supress_shadow then
+		vm:calc_lighting(false)
+		vm:write_to_map(false)
+	else
+		vm:calc_lighting()
+		vm:write_to_map()
+	end
 end)