home: disassemble more map/overworld functions

Signed-off-by: Tauwasser <Tauwasser@tauwasser.eu>

1 files changed, 133 insertions, 2 deletions

diff --git a/home/overworld.asm b/home/overworld.asm
index 8ea66ca..bd0cc4c 100644
--- a/home/overworld.asm
+++ b/home/overworld.asm
@@ -42,8 +42,139 @@ CheckStartmenuSelectHook:
 	dec a
 	ret
 
-Function2c4a::
-; TODO
+Function2c4a: ; 2c4a (0:2c4a)
+; copy of Function2ba8
+.loop
+	call Function2c5a
+	and a
+	ld a, [$cb6e]
+	bit 5, a
+	ret z
+	bit 6, a
+	jr z, .loop
+	scf
+	ret
+
+Function2c5a: ; 2c5a (0:2c5a)
+	ldh a, [hROMBank]
+	push af
+	ld a, BANK(Function50b9)
+	call Bankswitch
+	call Function50b9
+	call Function_18a0
+	ld a, BANK(Functiond6e4)
+	call Bankswitch
+	call Functiond6e4
+	ld a, BANK(_UpdateSprites)
+	call Bankswitch
+	call _UpdateSprites
+	call DelayFrame
+	call UpdateToolgear
+	ld hl, wToolgearFlags
+	set 2, [hl]
+	call DelayFrame
+	pop af
+	call Bankswitch
+	ret
+
+UpdateAndTransferToolgear: ; 2c8b (0:2c8b)
+	call DelayFrame
+	call UpdateToolgear
+	ld hl, wToolgearFlags
+	set 2, [hl] ;  ; transfer toolgear to window
+	call DelayFrame
+	ret
+
+ScheduleNorthRowRedraw: ; 2c9a (0:2c9a)
+	coord hl, 0, 0
+	call CopyToRedrawRowOrColumnSrcTiles
+	ld a, [wBGMapAnchor]
+	ldh [hRedrawRowOrColumnDest], a
+	ld a, [wBGMapAnchor + 1]
+	ldh [hRedrawRowOrColumnDest + 1], a
+	ld a, REDRAW_ROW
+	ldh [hRedrawRowOrColumnMode], a
+	ret
+
+ScheduleSouthRowRedraw: ; 2caf (0:2caf)
+	coord hl, 0, SCREEN_HEIGHT - 2
+	call CopyToRedrawRowOrColumnSrcTiles
+	ld a, [wBGMapAnchor]
+	ld l, a
+	ld a, [wBGMapAnchor + 1]
+	ld h, a
+	ld bc, BG_MAP_WIDTH * (SCREEN_HEIGHT - 2)
+	add hl, bc
+	; the following 4 lines wrap us from bottom to top if necessary
+	ld a, h
+	and HIGH(vBGMap1 - vBGMap0 - $01)
+	or HIGH(vBGMap0)
+	ldh [hRedrawRowOrColumnDest + 1], a
+	ld a, l
+	ldh [hRedrawRowOrColumnDest], a
+	ld a, REDRAW_ROW
+	ldh [hRedrawRowOrColumnMode], a
+	ret
+
+ScheduleEastColumnRedraw: ; 2cd0 (0:2cd0)
+	coord hl, SCREEN_WIDTH - 2, 0
+	call ScheduleColumnRedrawHelper
+	ld a, [wBGMapAnchor]
+	ld c, a
+	and ($FF ^ (BG_MAP_WIDTH - 1))  ; mask upper address bits
+	ld b, a
+	ld a, c
+	add SCREEN_WIDTH
+	and BG_MAP_WIDTH - 1            ; mask lower address bits
+	or b
+	ldh [hRedrawRowOrColumnDest], a
+	ld a, [wBGMapAnchor + 1]
+	ldh [hRedrawRowOrColumnDest + 1], a
+	ld a, REDRAW_COL
+	ldh [hRedrawRowOrColumnMode], a
+	ret
+
+ScheduleWestColumnRedraw: ; 2cef (0:2cef)
+	coord hl, 0, 0
+	call ScheduleColumnRedrawHelper
+	ld a, [wBGMapAnchor]
+	ldh [hRedrawRowOrColumnDest], a
+	ld a, [wBGMapAnchor + 1]
+	ldh [hRedrawRowOrColumnDest + 1], a
+	ld a, REDRAW_COL
+	ldh [hRedrawRowOrColumnMode], a
+	ret
+
+CopyToRedrawRowOrColumnSrcTiles: ; 2d04 (0:2d04)
+	ld de, wRedrawRowOrColumnSrcTiles
+	ld c, 2 * SCREEN_WIDTH
+.loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	dec c
+	jr nz, .loop
+	ret
+
+ScheduleColumnRedrawHelper: ; 2d10 (0:2d10)
+	ld de, wRedrawRowOrColumnSrcTiles
+	ld c, SCREEN_HEIGHT
+.loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	ld a, [hl]
+	ld [de], a
+	inc de
+	ld a, SCREEN_WIDTH - 1
+	add l
+	ld l, a
+	jr nc, .noCarry
+	inc h
+.noCarry
+	dec c
+	jr nz, .loop
+	ret
 
 if DEBUG
 SECTION "Install StartMenu Hook Function", ROM0[$35EC]