update: added stubs for cell updates

diff --git a/src/update.s b/src/update.s
index ecf9b0b41d697da0f67b63e1fdaf198c74434828..e9be5fc2e0f0c91a26ea31bcef5898b04496e334 100644 (file)
--- a/src/update.s
+++ b/src/update.s
@@ -31,3 +31,17 @@ update:
 
   
 
+  ; bg update queue 
+  ; this is called once during blank
+  ; and updates a fixed amount of tiles 
+  ; from a circular buffer
+  ; the buffer can hold up to 255 items and wraps around
+bg_update_queue_process:
+  ret
+
+  ; pushes a new bg update to the queue
+  ; inputs:
+  ;   hl: ptr to tile 
+  ;    a: tile data
+bg_update_queue_push:
+  ret