Split bank 6

1 files changed, 103 insertions, 0 deletions

diff --git a/src/engine/menus/unknown.asm b/src/engine/menus/unknown.asm
new file mode 100644
index 0000000..c6f04fa
--- /dev/null
+++ b/src/engine/menus/unknown.asm
@@ -0,0 +1,103 @@
+Func_18661: ; unreferenced
+	xor a
+	ld [wPlaysSfx], a
+	ld a, [wCheckMenuCursorXPosition]
+	ld d, a
+	ld a, [wCheckMenuCursorYPosition]
+	ld e, a
+	ldh a, [hDPadHeld]
+	or a
+	jr z, .check_button
+; check input from dpad
+	bit D_LEFT_F, a
+	jr nz, .left_or_right
+	bit D_RIGHT_F, a
+	jr z, .check_up_and_down
+.left_or_right
+; swap the lsb of x position value.
+	ld a, d
+	xor $1
+	ld d, a
+	jr .cursor_moved
+
+.check_up_and_down
+	bit D_UP_F, a
+	jr nz, .up_or_down
+	bit D_DOWN_F, a
+	jr z, .check_button
+.up_or_down
+	ld a, e
+	xor $1
+	ld e, a
+.cursor_moved
+	ld a, $1
+	ld [wPlaysSfx], a
+	push de
+	call .draw_blank_cursor
+	pop de
+	ld a, d
+	ld [wCheckMenuCursorXPosition], a
+	ld a, e
+	ld [wCheckMenuCursorYPosition], a
+	xor a
+	ld [wCheckMenuCursorBlinkCounter], a
+.check_button
+	ldh a, [hKeysPressed]
+	and A_BUTTON | B_BUTTON
+	jr z, .check_cursor_moved
+	and A_BUTTON
+	jr nz, .a_button
+
+; b button
+	ld a, -1
+	call Func_190fb
+	scf
+	ret
+
+; a button
+.a_button
+	call .draw_cursor
+	ld a, 1
+	call Func_190fb
+	scf
+	ret
+
+.check_cursor_moved
+	ld a, [wPlaysSfx]
+	or a
+	jr z, .check_cursor_blink
+	call PlaySFX
+.check_cursor_blink
+	ld hl, wCheckMenuCursorBlinkCounter
+	ld a, [hl]
+	inc [hl]
+	and %00001111
+	ret nz
+	ld a, SYM_CURSOR_R
+	bit D_RIGHT_F, [hl]
+	jr z, .draw_tile
+.draw_blank_cursor ; 186d4 (6:46d4)
+	ld a, SYM_SPACE
+.draw_tile
+	ld e, a
+	ld a, 10
+	ld l, a
+	ld a, [wCheckMenuCursorXPosition]
+	ld h, a
+	call HtimesL
+	ld a, l
+	add 1
+	ld b, a
+	ld a, [wCheckMenuCursorYPosition]
+	sla a
+	add 14
+	ld c, a
+	ld a, e
+	; b = 11, c = y_pos * 2 + 14
+	; h = x_pos * 10, l = 10
+	call WriteByteToBGMap0
+	or a
+	ret
+.draw_cursor ; 186f3 (6:46f3)
+	ld a, SYM_CURSOR_R
+	jr .draw_tile