chunk-based rendering

1 files changed, 29 insertions, 7 deletions

diff --git a/world.lua b/world.lua
index f4fcb70..c153a70 100644
--- a/world.lua
+++ b/world.lua
@@ -1,7 +1,6 @@
 local world = {}
 
-local chunk_size = 1024
-
+world.chunk_size = 1024
 world.chunks = {}
 setmetatable(world.chunks, {
 	__index = function(_, bee)
@@ -15,11 +14,11 @@ world.objects = {}
 world.last_id = 0
 
 function world.chunk_pos(x, y)
-	return math.floor(x / chunk_size), math.floor(y / chunk_size)
+	return math.floor(x / world.chunk_size), math.floor(y / world.chunk_size)
 end
 
 function world.world_pos(x, y)
-	return x * chunk_size, y * chunk_size
+	return x * world.chunk_size, y * world.chunk_size
 end
 
 function world.chunk(x, y)
@@ -27,13 +26,36 @@ function world.chunk(x, y)
 	if not world.chunks[cx][cy] then
 		-- load chunk from disk if the
 		world.chunks[cx][cy] = setmetatable(
-			{pos = {cx, cy}, objects = {}}, chunk)
+			{pos = {cx, cy}, objects = {}}, chunk_mt)
 	end
 	return world.chunks[cx][cy]
 end
 
-function world.get_object(id)
+function world.object(id)
+	return world.objects[id]
+end
+
+function world.all()
+	return coroutine.wrap(function()
+		for _, o in pairs(world.objects) do
+			coroutine.yield(o)
+		end
+	end)
+end
+
+function world.iterate(x1, y1, x2, y2)
+	return coroutine.wrap(function()
+		for x = x1, x2 + world.chunk_size, world.chunk_size do
+			for y = y1, y2 + world.chunk_size, world.chunk_size do
+				for _, o in pairs(world.chunk(x, y).objects) do
+					local x, y = unpack(o.data.pos)
+					if x >= x1 and x <= x2 and y >= y1 and y <= y2 then
+						coroutine.yield(o)
+					end
+				end
+			end
+		end
+	end)
 end
 
-world.__index = world
 return world