1 files changed, 78 insertions, 0 deletions
diff --git a/src/objs/tilemap.lua b/src/objs/tilemap.lua
new file mode 100644
index 0000000..572a99e
--- /dev/null
+++ b/src/objs/tilemap.lua
@@ -0,0 +1,78 @@
+-- Tilemap entity, it dynamically rebuilds its draw cache thingy
+-- You just need to worry not and use the tile getting/setting functions
+
+TILESIZE = 16
+function new_tilemap(width, height)
+  local map = new_entity()
+  add_comp(map, "Tilemap", width, height)
+
+  return map
+end
+
+local function ID(map, x, y)
+  return x + y * map.width + 1
+end
+
+-- local function POS(map, id)
+--   id = id - 1
+--   return id % map.width, math.floor(id / map.width)
+-- end
+
+register_comp("Tilemap", function(tilemap, width, height)
+  tilemap.tiledata = {}
+  for i=1, width*height do
+    tilemap.tiledata[i] = 0
+  end
+  tilemap.width = width
+  tilemap.height = height
+  tilemap.cache = {}
+  tilemap.cachesize = 0
+  tilemap.needs_rebuild = false
+end)
+
+function rebuild_tilemap(map)
+  map.cache = {}
+
+  for x = 0, map.width - 1 do
+    for y = 0, map.height - 1 do
+
+      local tile = get_tile(map, x, y)
+      if tile ~= 0 then
+        map.cachesize = map.cachesize + 1
+        map.cache[map.cachesize] = {
+          x = x * TILESIZE, y = y * TILESIZE,
+        }
+      end
+    end
+  end
+end
+
+function tilemap_draw_sys(tilemap)
+  if tilemap.needs_rebuild then
+    rebuild_tilemap(tilemap)
+    tilemap.needs_rebuild = false
+  end
+
+  for i=1, tilemap.cachesize do
+    local tile = tilemap.cache[i]
+    lg.circle("fill", tile.x, tile.y, 4)
+  end
+end
+
+function get_tile(map, x, y)
+  return map.tiledata[ID(map, x, y)]
+end
+
+function queue_tilemap_rebuild(tilemap)
+  tilemap.needs_rebuild = true
+end
+
+function set_tile(map, x, y, tileid)
+  map.tiledata[ID(map, x, y)] = tileid
+  map.needs_rebuild = true
+end
+
+function remove_tile(map, x, y)
+  map.tiledata[ID(map, x, y)] = 0
+  map.needs_rebuild = true
+end