update: oam now only clears the unused objects each frame

diff --git a/src/mem.s b/src/mem.s
index ae06a618175c983540f2d54f225b5135eb595572..07c063e1894fcbf0fc8a9b64efb1e9c53c78544d 100644 (file)
--- a/src/mem.s
+++ b/src/mem.s
@@ -100,7 +100,30 @@ shadow_oam_clear:
   ld hl, shadow_oam
   ld d, 0
   jp memset
-
+       
+       ; clears the remaining shadow oam 
+       ; entries
+shadow_oam_clear_rest:
+       ld hl, shadow_oam
+       ld d, 0
+       ld a, [current_oam_obj]
+       ld e, a
+       add hl, de ; hl = soam obj offset
+       xor a, a
+
+       sra e
+       sra e ; / 4 for loop coutner
+
+@clear_loop:
+       ld [hl+], a
+       ld [hl+], a
+       ld [hl+], a
+       ld [hl+], a
+       dec e
+       jr nz, @clear_loop REL
+
+       ret
+       
 
 ; dma shadow oam to oam
 ; registers:

diff --git a/src/update.s b/src/update.s
index 010c83a4c63cd6ae57fe20f41e29be8338d61709..9ae0149a711acb8c83f00fa0f87f5726990c44bf 100644 (file)
--- a/src/update.s
+++ b/src/update.s
@@ -5,8 +5,6 @@ update_game:
   ; tick rng every frame
   call rand
 
-  ; clear oam
-  call shadow_oam_clear
        
        call video_map_adjust_scroll
 
@@ -16,6 +14,9 @@ update_game:
        call actor_update_all
 
        
+  ; clear oam
+  call shadow_oam_clear_rest
+
   ret
 
 new_game: