Remove unused LAST_SC* variables

inc/util.inc

@@ -64,3 +64,13 @@ MACRO slan
         sla \1
     ENDR
 ENDM
+
+; Performs SRL on a register N times
+; \1 8-bit register
+; \2 N, a value 1-8
+MACRO srln
+    ASSERT 1 <= \2 && \2 <= 8
+    REPT \2
+        srl \1
+    ENDR
+ENDM

src/map.s

@@ -6,9 +6,6 @@ SECTION "Map Data", WRAM0
 PAGEX:: DB ; X coordinate to enqueue map column at
 PAGEY:: DB ; Y coordinate to enqueue map row at
 
-LAST_SCX:: DB ; Value of SCX last frame
-LAST_SCY:: DB ; Value of SCY last frame
-
 PENDING_ROW_PTR:: DW ; Where to write pending row data (0 = no write)
 PENDING_ROW_DATA:: DS SCRN_VX_B ; Row to be written
 
@@ -39,11 +36,9 @@ Map_Load::
     ; Initialize scroll state
     ld a, INIT_SCX
     ld [rSCX], a
-    ld [LAST_SCX], a
 
     ld a, INIT_SCY
     ld [rSCY], a
-    ld [LAST_SCY], a
 
     ld a, 8
     ld [PAGEX], a
@@ -245,10 +240,7 @@ Map_Scroll::
     ld [PAGEX], a
 
 .done:
-    ld hl, LAST_SCY
-    ld a, [rSCY]
-    ld [hl], a
-
+    ; TODO: Turn jumps here into rets
     ret
 
 Map_Update::