objanim: Added simple animation for down door opening.

This now just needs to be made more generic for the other directions.

diff --git a/src/objanim.s b/src/objanim.s
index 34bb5abae69cced13536bd40c9e448667ef32cd7..516c7565aba1d6c0e1b46b478030e5f32f872959 100644 (file)
--- a/src/objanim.s
+++ b/src/objanim.s
@@ -49,8 +49,8 @@ objanim_door_open:
        ld [de], a
        inc de ; de = timer
        
-       ; set timer
-       ld a, 0x40
+       ; clear frame counter
+       xor a, a
        ld [de], a
 
        ; set gameplay flag to pause object updates
@@ -85,8 +85,16 @@ objanim_door_open_down_fn:
 
        ld a, [de] ; a = x position
        tile_to_scrn OBJ_OFF_X, c 
-       ld [hl+], a
        ld [TMP_X], a
+       ; offset position by counter 
+       push af
+       ld a, [objanim+obja_timer]
+       sra a
+       ld b, a
+       pop af
+       sub a, b
+       ld [hl+], a
+
        
        ; door tile
        ld a, DOOR_SPRITE_TILE 
@@ -106,6 +114,13 @@ objanim_door_open_down_fn:
        ; set x pos
        ld a, [TMP_X]
        add a, 8 ; move over a tile
+       ; offset position by counter
+       push af
+       ld a, [objanim+obja_timer]
+       sra a
+       ld b, a
+       pop af
+       add a, b
        ld [hl+], a
        
        ; tile 
@@ -117,10 +132,10 @@ objanim_door_open_down_fn:
        ld [hl], a
 
        ; check if we are done
-       ld de, objanim+obja_timer
-       ld a, [de]
-       dec a
-       ld [de], a ; timer--
+       ld a, [objanim+obja_timer]
+       inc a
+       ld [objanim+obja_timer], a ; frame counter++
+       cp a, 0x10 ; end frame?
        jr z, @timer_done REL
 
        ldnull bc