From 290dc0d6d00e19c5a661b541e84e90ac3db367a3 Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Sat, 26 Jul 2025 07:22:33 +0200
Subject: [PATCH] mapgen: wip room patter drawing

---
 src/defs.s         |  3 ++-
 src/mapgen.s       | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 src/roompatterns.s |  7 +++++++
 3 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/src/defs.s b/src/defs.s
index 0f1c3f7..bff715d 100644
--- a/src/defs.s
+++ b/src/defs.s
@@ -75,7 +75,8 @@
   ; the upper nibble is
   ; an index into the current map's 
   ; exit table
-.de CF_EXIT, 1
+.de CF_EXIT, 2
+.de CF_DOOR, 4
 
   ; cells struct
 .se 0
diff --git a/src/mapgen.s b/src/mapgen.s
index 54aace5..9420e41 100644
--- a/src/mapgen.s
+++ b/src/mapgen.s
@@ -77,4 +77,53 @@ mapgen_up_left_room:
   ;   hl: origin inside of map struct
   ;   bc: room pattern header pointer
 mapgen_draw_room_pattern:
+  ld a, [bc] ; read room pattern size
+  and a, 0x0F ; number of tiles per row 
+  ; e = tile per row counter
+  ld e, a
+
+  ld a, [bc]
+  and a, 0xF0 ; number of rows
+  swap a
+  ld d, a ; d = number of rows
+  
+  inc bc ; move past header
+  ; bc = first room pattern entry
+@y_loop:
+    call mapgen_draw_room_pattern_row
+    dec d
+  jr nz, @y_loop REL
+
+  ret
+
+  ; draws a single map pattern row
+  ; writes tile flags
+  ; inputs:
+  ;   hl: map ptr
+  ;   bc: room pattern 
+  ;    e: tiles per row counter
+  ; preserves:
+  ;   de
+  ; returns:
+  ;   hl: incremented by number of tiles * c_size
+  ;   bc: incremented by number of tiles
+mapgen_draw_room_pattern_row:
+  push de  
+@x_loop:
+    ld a, [bc]
+    inc bc ; next pattern
+
+    ; read from tile and flag tables and write to map
+    push hl
+    push de
+    ld hl, room_pattern_tile_translation
+    
+    pop de
+    pop hl
+
+    ; tiles--
+    dec e
+  jr nz, @x_loop REL
+
+  pop de
   ret
diff --git a/src/roompatterns.s b/src/roompatterns.s
index 69c9876..dcfb369 100644
--- a/src/roompatterns.s
+++ b/src/roompatterns.s
@@ -73,6 +73,13 @@ room_pattern_tile_translation:
 
   ; translation table for flags
 room_pattern_floor1_flags_translation:
+ ; walls
+ .db CF_COLLISION, CF_COLLISION, CF_COLLISION 
+ .db CF_COLLISION, CF_COLLISION, CF_COLLISION 
+ .db CF_COLLISION, CF_COLLISION 
+ .db 0x00 ; floor
+ ; doors
+ .db CF_DOOR, CF_DOOR, CF_DOOR, CF_DOOR 
 
   ; table of 6 by 6 room patterns
 room_pattern_6by6:
-- 
2.30.2