From e5df0b9f170bd8060d49e47fd790dc0ae9f62de6 Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Tue, 31 Dec 2024 11:51:42 +0100
Subject: [PATCH] map: Added base room copy routine

---
 src/map.s | 98 ++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 86 insertions(+), 12 deletions(-)

diff --git a/src/map.s b/src/map.s
index d7779f1..102469a 100644
--- a/src/map.s
+++ b/src/map.s
@@ -507,12 +507,6 @@ map_gen_next:
   ld a, [hl]
   ld d, a
   pop hl ; hl = room dst
-  
-  ; set default exit ptr to 0000 
-  ; to indicate it is empty
-  xor a, a 
-  ld b, a
-  ld c, a
 
   ; now we copy
   push hl ; save original ptr for now
@@ -534,14 +528,12 @@ map_gen_next:
   ld [mapgen_depth], a
   ret
 
-  ; copies a base room 
+  ; copies a base room
+  ; sets all exits to 0000 (null ptr)
   ; inputs:
   ;   de: base room
   ;   hl: target
-  ;   bc: default exit room ptr
 map_gen_copy_base_room:
-  push bc
-
   ; save original hl in tmp
   ; this can then be used as a ptr to the struct 
   ld a, h
@@ -582,6 +574,7 @@ map_gen_copy_base_room:
   pop bc ; bc = tile ptr target 
   push bc ; need to pop into hl in a bit :^)
 
+  ; set tiles ptr
   dec hl ; hl = room header tile ptr
   ld a, c
   ld [hl+], a
@@ -591,21 +584,102 @@ map_gen_copy_base_room:
   pop hl ; get target back
   ld bc, ROOM_TILES_SIZE
   call memcpy
+  push hl ; save hl again just like before 
 
 @copy_flags:
+
+  ; hl = header 
+  ld a, [tmp]
+  ld h, a
+  ld a, [tmp+1]
+  ld l, a
+
+  ld bc, room_flags 
+  add hl, bc ; hl = flags ptr
+
+  ; read src flags into de 
+  ld a, [hl+]
+  ld e, a
+  ld a, [hl]
+  ld d, a 
+
+  ; fix flags ptr
+  pop bc ; bc = flags ptr target 
+  push bc ; push again to get the value into hl later
+
+  ; set flags ptr
+  dec hl ; hl = room flag ptr 
+  ld a, c
+  ld [hl+], a
+  ld a, b
+  ld [hl], a
+
+  pop hl ; get target back 
+
   ; copy flags
   ld bc, ROOM_FLAGS_SIZE
   call memcpy
+  push hl ; save hl again 
 
 @copy_actors:
+  ; hl = header 
+  ld a, [tmp]
+  ld h, a
+  ld a, [tmp+1]
+  ld l, a
+
+  ld bc, room_actor_table 
+  add hl, bc ; hl = flags ptr
+
+  ; read src actors into de 
+  ld a, [hl+]
+  ld e, a
+  ld a, [hl]
+  ld d, a 
+
+  ; fix flags ptr
+  pop bc ; bc = actors ptr target 
+  push bc ; push again to get the value into hl later
+
+  ; set actor ptr
+  dec hl ; hl = room actor ptr 
+  ld a, c
+  ld [hl+], a
+  ld a, b
+  ld [hl], a
+
+  pop hl ; get target back 
+
   ; copy actors 
   ld bc, ACTOR_TABLE_SIZE
   call memcpy
+  push hl ; save again for later
 
 @setup_exits:
-  ; set exits 
-  pop bc ; restore default exit value 
+  ; fix exit table 
 
+  ; hl = header 
+  ld a, [tmp]
+  ld h, a
+  ld a, [tmp+1]
+  ld l, a
+
+  ld bc, room_exit_table 
+  add hl, bc ; hl = flags ptr
+
+  pop bc ; bc = exit table location 
+  push bc ; push again we need value back in hl soon :^)
+
+  ; set exit table ptr
+  ld a, c
+  ld [hl+], a
+  ld a, b
+  ld [hl], a
+
+  pop hl ; hl = exit table location 
+  ; set exits to NULL  
+  xor a, a
+.rep ci, 2 * ROOM_EXITS_MAX, 1, ld a, [hl+]
 
   ret
 
-- 
2.30.2