From b4c189ab1b6233c7e7e260446e80b789f375b5d6 Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Sat, 11 Feb 2023 15:33:13 +0000
Subject: change from random worldgen to be based on a hash of position;
 implement serverside chunk unloading

---
 server/server.lua | 31 +++++++++++++++++++++++++------
 1 file changed, 25 insertions(+), 6 deletions(-)

(limited to 'server/server.lua')

diff --git a/server/server.lua b/server/server.lua
index cc9903e..88f4efe 100644
--- a/server/server.lua
+++ b/server/server.lua
@@ -3,6 +3,7 @@ local json = require"common.dkjson"
 local chunk = require"common.chunk"
 local noise = require"noise"
 local coords = require"common.coords"
+local Pos = coords.Pos
 local worldgen = require"worldgen"
 local MapS = require"map".MapS
 local posix_time = require"posix.time"
@@ -34,7 +35,7 @@ local function random_color()
 	return {math.random(),math.random(),math.random()}
 end
 local function make_player(peer)
-	local p = {pos={0,0},color=random_color(),peer=peer,id=nextid}
+	local p = {pos=Pos:make(0,0),color=random_color(),peer=peer,id=nextid}
 	nextid = nextid + 1
 	return p
 end
@@ -42,8 +43,8 @@ end
 local function player_info_part(player)
 	return {
 		id=player.id,
-		x=player.pos[1],
-		y=player.pos[2],
+		x=player.pos.x,
+		y=player.pos.y,
 		color=player.color,
 	}
 end
@@ -95,8 +96,7 @@ local function handle_ev(ev)
 		local op = j.t
 		if op == "ppos" then
 			local x,y = j.x,j.y
-			player.pos[1] = x
-			player.pos[2] = y
+			player.pos = coords.Pos:make(x,y)
 			-- print(player.id,"-->",player.pos[1],player.pos[2])
 			for i,otherplayer in ipairs(playerlist) do
 				if otherplayer ~= player then
@@ -157,11 +157,30 @@ local ndts = 100
 local ntick = 0
 
 
+local function player_near_chunk(cp)
+	-- true: chunk at cp should stay loaded (because of a nearby player),
+	-- false: no players nearby, can be unloaded
+	-- this is kind of inefficient at the moment
+	for _,player in ipairs(playerlist) do
+		local pcp = player.pos:to_hex():containing_chunk()
+		for _,neighb in ipairs(pcp:neighborhood()) do
+			if neighb == cp then
+				return true
+			end
+		end
+	end
+	return false
+end
+
 local function tick(ntick)
 	if ntick % 30 == 0 then
-		print("saving things...")
+		print("saving things")
 		for cp,ch in map:iter_chunks() do
 			map:save_chunk(cp)
+			if not player_near_chunk(cp) then
+				print("unloading chunk",cp)
+				map:remove_chunk(cp)
+			end
 		end
 	end
 end
-- 
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