From 82ccd61a659e026e57a821bf0b387fd8eb14fe59 Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Sat, 29 Mar 2025 06:22:26 +0100
Subject: [PATCH] ui: added stub for UI state

---
 src/defs.s  | 4 +++-
 src/state.s | 7 ++++++-
 src/ui.s    | 6 ++++++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/defs.s b/src/defs.s
index ea82822..27c5286 100644
--- a/src/defs.s
+++ b/src/defs.s
@@ -65,10 +65,12 @@
 .de st_time, 1
   ; state routine (BE)
   ; it can return 0000 in hl
-  ; or a new state address in hl (LE)
+  ; or a new state address in hl (BE)
   ; if bc is not 0000 after
   ; the calling state's address
   ; will be set to bc immediatly 
+  ; inputs for all state routines:
+  ;   de: state pointer
 .de st_routine, 2
   ; next state (BE)
 .de st_next, 2
diff --git a/src/state.s b/src/state.s
index 2b3c136..a1446b3 100644
--- a/src/state.s
+++ b/src/state.s
@@ -26,7 +26,9 @@ st_update:
   pop de
   ret
 @update:
- 
+  ; de = actor ptr
+  pop de
+  push de
   call call_hl
 
   pop hl ; hl = original actor ptr = dst
@@ -86,6 +88,9 @@ st_cursor_draw:
 st_cursor_delay:
   st_def CURSOR_MOVE_TIMER, st_null_fn, st_cursor
 
+st_ui_building_selector:
+  st_def 0, ui_building_selector_update, st_ui_building_selector
+
 st_update_game:
   st_def 0x00, update_game, st_update_game
 
diff --git a/src/ui.s b/src/ui.s
index 95910a5..86811f7 100644
--- a/src/ui.s
+++ b/src/ui.s
@@ -13,3 +13,9 @@ ui_draw:
   ld [hl], a
 
   ret
+
+  ; ui building selector state
+ui_building_selector_update:
+
+  ldnull bc
+  ret
-- 
2.30.2