From 9339e47c79f40fe9c4541e638d7fd67ab634c600 Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Sat, 4 Feb 2023 23:28:08 +0000
Subject: improve tracking of loading chunks, and increase load dist around
 player

---
 common/map.lua | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

(limited to 'common/map.lua')

diff --git a/common/map.lua b/common/map.lua
index 5bcd09e..d32cbf3 100644
--- a/common/map.lua
+++ b/common/map.lua
@@ -1,6 +1,11 @@
 -- a Map is a 2d array of chunks
 -- it handles loading and unloading of chunks
--- the specifics of which are then implemented separately for client and server
+-- each slot in the Map is either a Chunk object (if that chunk is loaded),
+-- nil (if not loaded), or false (if 'loading'). on the client 'loading' means
+-- the request for the chunk is currently in flight. on the server it might one day
+-- mean that terrain generation for that chunk is currently in progress.
+-- to test whether a chunk is loaded you can do if map:chunk(cp) then ... end
+-- to test whether a chunk needs to be loaded you do if map:chunk(cp) == nil then ... end.
 -- it will probably also do things relating to entities and multiblock things
 
 local class = require"common.class"
@@ -11,13 +16,21 @@ local Map = class()
 function Map.make(cls)
 	return setmetatable({chunks={}},cls)
 end
-function Map.add_chunk(self,cp,the_chunk)
-	print("adding chunk",cp)
-	assert(the_chunk.cp == cp,"attempting to add chunk with the wrong cp")
+function Map._set_chunk(self,cp,value)
 	if not self.chunks[cp.u] then self.chunks[cp.u] = {} end
-	self.chunks[cp.u][cp.v] = the_chunk
+	self.chunks[cp.u][cp.v] = value
+end
+function Map.add_chunk(self,the_chunk)
+	local cp = the_chunk.cp
+	print("adding chunk",cp)
+	self:_set_chunk(cp,the_chunk)
+end
+function Map.mark_chunk_loading(self,cp)
+	print("marking chunk as loading",cp)
+	self:_set_chunk(cp,false)
 end
 function Map.unload_chunk(self,cp)
+	print("unloading chunk",cp)
 	if not self.chunks[cp.u] then return end
 	self.chunks[cp.u][cp.v] = nil
 	-- remove list if empty
@@ -42,7 +55,7 @@ function Map.at(self,hpos)
 	local cpu,cpv = math.floor(hpos.q/CHUNK_SIZE),math.floor(hpos.r/CHUNK_SIZE)
 	local hoffq,hoffr = hpos.q-(cpu*CHUNK_SIZE), hpos.r-(cpv*CHUNK_SIZE)
 	local ch = self:_chunkuv(cpu,cpv)
-	if ch == nil then return nil end
+	if not ch then return nil end
 	return ch:_atqr(hoffq,hoffr)
 end
 function Map.set_at(self,hpos,tile)
@@ -50,7 +63,7 @@ function Map.set_at(self,hpos,tile)
 	local ch = self:chunk(cp)
 	-- setting a tile in an unloaded chunk is silently ignored
 	-- this might change one day
-	if ch == nil then return nil end
+	if not ch then return nil end
 	ch:set_at(hoffs,tile)
 end
 
-- 
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