From: Lukas Krickl <lukas@krickl.dev>
Date: Mon, 12 May 2025 05:12:14 +0000 (+0200)
Subject: map: Added map header for future expansion purposes
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=3f5708057c52602d644ee635a94420a0c07fb618;p=gbrg%2F.git

map: Added map header for future expansion purposes
---

diff --git a/maps/default_map.s b/maps/default_map.s
index b5580b4..d937e1b 100644
--- a/maps/default_map.s
+++ b/maps/default_map.s
@@ -1,3 +1,7 @@
+default_map_header:
+.db 0, 0, 0, 0 ; flags
+dw default_map_bg
+
 default_map_bg:
 
 .db 0x65,0x0, 0x64,0x0, 0x64,0x0, 0x64,0x0, 0x64,0x0, 0x64,0x0, 0x64,0x0, 0x64,0x0
diff --git a/src/defs.s b/src/defs.s
index ffd0878..ee02818 100644
--- a/src/defs.s
+++ b/src/defs.s
@@ -106,3 +106,11 @@
 .de bge_tile_ptr, 2
 .de bge_new_tile, 1
 .de bge_size, 0
+
+  ; map header struct
+.se 0
+.de map_flags_1, 1
+.de map_flags_2, 1
+.de map_flags_3, 1
+.de map_flags_4, 1
+.de map_bg_ptr, 2
diff --git a/src/map.s b/src/map.s
index 06bcc8a..6b961ba 100644
--- a/src/map.s
+++ b/src/map.s
@@ -1,18 +1,34 @@
 
   ; initial map setup
 map_init:
-  ld hl, default_map_bg 
+  ld hl, default_map_header 
   call tile_map_load
 
   call cells_draw_all
 
   ret
-  
+ 
+ ; loads a map 
+ ; inputs:
+ ;    hl: map header
+tile_map_load:
+  ; load bg ptr
+  ld de, map_bg_ptr
+  add hl, de ; hl = bg_ptr
+  ld a, [hl+]
+  ld d, a
+  ld a, [hl+]
+  ld h, a
+  ld l, d
+  ; hl = bg ptr
+  call tile_map_bg_load
+  ret
+
   ; loads a tile map into cells 
   ; and to cell memory
   ; inputs:
-  ;   hl: map
-tile_map_load:
+  ;   hl: map bg data
+tile_map_bg_load:
   ; first clear 
   push_all
 
diff --git a/tools/tms2map.py b/tools/tms2map.py
index 61f5099..f250822 100755
--- a/tools/tms2map.py
+++ b/tools/tms2map.py
@@ -47,6 +47,10 @@ def print_data(data, name, layer):
         print(",", end='')
         print(hex(TILE_FLAGS[int(byte)-1]), end=end)
 
+def print_header(name):
+    print(name + "_header:")
+    print(".db 0, 0, 0, 0 ; flags")
+    print("dw " + name + "_bg\n")
     
 def get_flag(tile):
     for child in tile:
@@ -67,6 +71,8 @@ def get_flags(tileset):
 def convert(src, name):
     tree = ET.parse(src)
     root = tree.getroot()
+    
+    print_header(name)
 
     for child in root:
         if child.tag == "layer":