From e4a9a6948dc927c4bfd6e0c14219ff55f96bc9b1 Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Fri, 8 Aug 2025 06:38:09 +0200
Subject: [PATCH] object animation: added stub for object animations

This system will allow playing simple animations e.g. when a door opens.
---
 src/defs.s    | 18 +++++++++++++-----
 src/main.s    |  1 +
 src/mem.s     |  3 ++-
 src/objanim.s |  4 ++++
 src/wram.s    |  5 +++--
 5 files changed, 23 insertions(+), 8 deletions(-)
 create mode 100644 src/objanim.s

diff --git a/src/defs.s b/src/defs.s
index ce128fd..b12ada4 100644
--- a/src/defs.s
+++ b/src/defs.s
@@ -316,6 +316,19 @@
   ; pointer to new map struct
 .de exit_to, 2
 .de exit_size, 0
+	
+	; object animation struct
+	; simple call in update code
+	; with a single state
+	; intended for use with short-term map animations
+	; e.g. door opening
+.se 0
+.de obja_st, st_size
+.de obja_flags, 1
+.de obja_pos_y, 1
+.de obja_pos_x, 1
+.de obja_dat, 1
+.de obja_size, 0
 
 ; special text commands
 
@@ -324,12 +337,7 @@
 ; byte as a number
 #define TEXT_NUMBER 0x80
 
-  ; dice display
-
   ; constants
-#define DD_TIME 90 
-#define DD_D0_TILE 0x90 
-#define DD_CROSS_TILE 0xA0
 
 #define DISTANCE_BGTA 1
 #define DISTANCE_AGTB 0
diff --git a/src/main.s b/src/main.s
index 2972f72..677a7f4 100644
--- a/src/main.s
+++ b/src/main.s
@@ -76,6 +76,7 @@ main:
 #include "demos.s"
 #include "mainmenu.s"
 #include "actsave.s"
+#include "objanim.s"
 
 ; fill bank
 .fill 0xFF, 0x4000 - $
diff --git a/src/mem.s b/src/mem.s
index cd99e3e..7ffb0e1 100644
--- a/src/mem.s
+++ b/src/mem.s
@@ -32,7 +32,8 @@ mem_init:
   ld hl, st_unit_delay_to_active
   ld bc, st_size
   call memcpy
-
+	
+	call objanim_init
   
   ; set up default game speed
   ld a, GAME_SPEED_DEFAULT
diff --git a/src/objanim.s b/src/objanim.s
new file mode 100644
index 0000000..d13fca2
--- /dev/null
+++ b/src/objanim.s
@@ -0,0 +1,4 @@
+
+	; sets up object animation state
+objanim_init:
+	ret
diff --git a/src/wram.s b/src/wram.s
index 65491e1..e3c7990 100644
--- a/src/wram.s
+++ b/src/wram.s
@@ -73,8 +73,6 @@ redraw_steps: .adv 1
 ; same memory as empty_unit
 empty_oam: .adv oamsize
 
-  ; ptr to actor for next UI update
-ui_draw_actor: .adv 2
 
   ; can be used for custom state transtions
   ; simple write state info to this location 
@@ -94,6 +92,9 @@ scroll_x: .adv 1
   ; allows us to move scroll when needed 
 scroll_move_y: .adv 1
 scroll_move_x: .adv 1
+	
+	; state for object animation
+objanim: .adv obja_size
 
   ; game state
   ; this region holds the entire game state
-- 
2.30.2