tilemap skeleton

2 files changed, 87 insertions, 6 deletions

diff --git a/main.lua b/main.lua
index 5811733..c739bf4 100644
--- a/main.lua
+++ b/main.lua
@@ -10,17 +10,21 @@ function love.load()
   event_bind(scn.on_update, "Sprite", sprite_anim_sys)
 
   event_bind(scn.on_draw, "Sprite", sprite_draw_sys)
+  event_bind(scn.on_draw, "Tilemap", tilemap_draw_sys)
   set_scene(scn)
 
   new_player(100, 100)
 
   box1 = phys.Box.new(20, 20, 16, 16, {
     layers = {},
-    mask = {"hard"},
+    mask = { "hard" },
   })
 
   ground1 = phys.Box.new(5, 50, 64, 16, {})
-  ground2 = phys.Box.new(64-16, 50+16, 16, 64, {})
+  ground2 = phys.Box.new(64 - 16, 50 + 16, 16, 64, {})
+
+  local tilemap = new_tilemap(64, 64)
+  scn.tilemap = tilemap
 end
 
 function love.update(dt)
@@ -49,15 +53,14 @@ function love.draw(dt)
   -- TODO: Take care of weird displays
   lg.setCanvas()
   local scr_width, scr_height = lg.getDimensions()
-  WindowScale = min(scr_width/SCR_WIDTH, scr_height/SCR_HEIGHT)
+  WindowScale = min(scr_width / SCR_WIDTH, scr_height / SCR_HEIGHT)
 
   lg.draw(
     viewport,
-    scr_width/2, scr_height/2, 0,
+    scr_width / 2, scr_height / 2, 0,
     WindowScale, WindowScale,
-    SCR_WIDTH/2, SCR_HEIGHT/2)
+    SCR_WIDTH / 2, SCR_HEIGHT / 2)
 
   lg.print(tostring(love.timer.getFPS()))
   input_step()
 end
-
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