1 files changed, 676 insertions, 0 deletions
diff --git a/engine/menus/menu.asm b/engine/menus/menu.asm
new file mode 100644
index 00000000..2073e5ca
--- /dev/null
+++ b/engine/menus/menu.asm
@@ -0,0 +1,676 @@
+_2DMenu_::
+	xor a
+	ldh [hBGMapMode], a
+	call MenuBox
+	call Place2DMenuItemStrings
+	call UpdateSprites
+	call ApplyTilemap
+	call Init2DMenuCursorPosition
+	call StaticMenuJoypad
+	call MenuClickSound
+	ld a, [wMenuDataFlags]
+	bit 1, a
+	jr z, .skip
+	call GetMenuJoypad
+	bit SELECT_F, a
+	jr nz, .quit1
+
+.skip
+	ld a, [wMenuDataFlags]
+	bit 0, a
+	jr nz, .skip2
+	call GetMenuJoypad
+	bit B_BUTTON_F, a
+	jr nz, .quit2
+
+.skip2
+	ld a, [w2DMenuNumCols]
+	ld c, a
+	ld a, [wMenuCursorY]
+	dec a
+	call SimpleMultiply
+	ld c, a
+	ld a, [wMenuCursorX]
+	add c
+	ld [wMenuCursorBuffer], a
+	and a
+	ret
+
+.quit1
+	scf
+	ret
+
+.quit2
+	scf
+	ret
+
+Get2DMenuNumberOfColumns:
+	ld a, [wMenuData_2DMenuDimensions]
+	and $f
+	ret
+
+Get2DMenuNumberOfRows:
+	ld a, [wMenuData_2DMenuDimensions]
+	swap a
+	and $f
+	ret
+
+Place2DMenuItemStrings:
+	ld hl, wMenuData_2DMenuItemStringsAddr
+	ld e, [hl]
+	inc hl
+	ld d, [hl]
+	call GetMenuTextStartCoord
+	call Coord2Tile
+	call Get2DMenuNumberOfRows
+	ld b, a
+.row
+	push bc
+	push hl
+	call Get2DMenuNumberOfColumns
+	ld c, a
+.col
+	push bc
+	ld a, [wMenuData_2DMenuItemStringsBank]
+	call Place2DMenuItemName
+	inc de
+	ld a, [wMenuData_2DMenuSpacing]
+	ld c, a
+	ld b, 0
+	add hl, bc
+	pop bc
+	dec c
+	jr nz, .col
+	pop hl
+	ld bc, 2 * SCREEN_WIDTH
+	add hl, bc
+	pop bc
+	dec b
+	jr nz, .row
+	ld hl, wMenuData_2DMenuFunctionAddr
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	or h
+	ret z
+	ld a, [wMenuData_2DMenuFunctionBank]
+	rst FarCall
+	ret
+
+Init2DMenuCursorPosition:
+	call GetMenuTextStartCoord
+	ld a, b
+	ld [w2DMenuCursorInitY], a
+	dec c
+	ld a, c
+	ld [w2DMenuCursorInitX], a
+	call Get2DMenuNumberOfRows
+	ld [w2DMenuNumRows], a
+	call Get2DMenuNumberOfColumns
+	ld [w2DMenuNumCols], a
+	call .InitFlags_a
+	call .InitFlags_b
+	call .InitFlags_c
+	ld a, [w2DMenuNumCols]
+	ld e, a
+	ld a, [wMenuCursorBuffer]
+	ld b, a
+	xor a
+	ld d, 0
+.loop
+	inc d
+	add e
+	cp b
+	jr c, .loop
+	sub e
+	ld c, a
+	ld a, b
+	sub c
+	and a
+	jr z, .reset1
+	cp e
+	jr z, .okay1
+	jr c, .okay1
+.reset1
+	ld a, 1
+.okay1
+	ld [wMenuCursorX], a
+	ld a, [w2DMenuNumRows]
+	ld e, a
+	ld a, d
+	and a
+	jr z, .reset2
+	cp e
+	jr z, .okay2
+	jr c, .okay2
+.reset2
+	ld a, 1
+.okay2
+	ld [wMenuCursorY], a
+	xor a
+	ld [wCursorOffCharacter], a
+	ld [wCursorCurrentTile], a
+	ld [wCursorCurrentTile + 1], a
+	ret
+
+.InitFlags_a:
+	xor a
+	ld hl, w2DMenuFlags1
+	ld [hli], a
+	ld [hld], a
+	ld a, [wMenuDataFlags]
+	bit 5, a
+	ret z
+	set 5, [hl]
+	set 4, [hl]
+	ret
+
+.InitFlags_b:
+	ld a, [wMenuData_2DMenuSpacing]
+	or $20
+	ld [w2DMenuCursorOffsets], a
+	ret
+
+.InitFlags_c:
+	ld hl, wMenuDataFlags
+	ld a, A_BUTTON
+	bit 0, [hl]
+	jr nz, .skip
+	or B_BUTTON
+.skip
+	bit 1, [hl]
+	jr z, .skip2
+	or SELECT
+.skip2
+	ld [wMenuJoypadFilter], a
+	ret
+
+_StaticMenuJoypad::
+	call Place2DMenuCursor
+_ScrollingMenuJoypad::
+	ld hl, w2DMenuFlags2
+	res 7, [hl]
+	ldh a, [hBGMapMode]
+	push af
+
+.menu_joypad_loop
+	call Move2DMenuCursor
+	ldh a, [hOAMUpdate]
+	push af
+	ld a, $1
+	ldh [hOAMUpdate], a
+	call WaitBGMap
+	pop af
+	ldh [hOAMUpdate], a
+	xor a
+	ldh [hBGMapMode], a
+
+.loopRTC
+	call UpdateTimeAndPals
+	call Menu_WasButtonPressed
+	jr c, .pressed
+	ld a, [w2DMenuFlags1]
+	bit 7, a
+	jp nz, .done
+	jr .loopRTC
+
+.pressed
+	call _2DMenuInterpretJoypad
+	jp c, .done
+	ld a, [w2DMenuFlags1]
+	bit 7, a
+	jr nz, .done
+	call GetMenuJoypad
+	ld b, a
+	ld a, [wMenuJoypadFilter]
+	and b
+	jp z, .menu_joypad_loop
+
+.done
+	pop af
+	ldh [hBGMapMode], a
+	call GetMenuJoypad
+	ret
+
+Menu_WasButtonPressed:
+	ld a, [w2DMenuFlags1]
+	bit 6, a
+	jr z, .skip_to_joypad
+	callfar PlaySpriteAnimationsAndDelayFrame
+
+.skip_to_joypad
+	call JoyTextDelay
+	call GetMenuJoypad
+	and a
+	ret z
+	scf
+	ret
+
+_2DMenuInterpretJoypad:
+	call GetMenuJoypad
+	bit A_BUTTON_F, a
+	jp nz, .a_b_start_select
+	bit B_BUTTON_F, a
+	jp nz, .a_b_start_select
+	bit SELECT_F, a
+	jp nz, .a_b_start_select
+	bit START_F, a
+	jp nz, .a_b_start_select
+	bit D_RIGHT_F, a
+	jr nz, .d_right
+	bit D_LEFT_F, a
+	jr nz, .d_left
+	bit D_UP_F, a
+	jr nz, .d_up
+	bit D_DOWN_F, a
+	jr nz, .d_down
+	and a
+	ret
+
+.set_bit_7
+	ld hl, w2DMenuFlags2
+	set 7, [hl]
+	scf
+	ret
+
+.d_down
+	ld hl, wMenuCursorY
+	ld a, [w2DMenuNumRows]
+	cp [hl]
+	jr z, .check_wrap_around_down
+	inc [hl]
+	xor a
+	ret
+
+.check_wrap_around_down
+	ld a, [w2DMenuFlags1]
+	bit 5, a
+	jr nz, .wrap_around_down
+	bit 3, a
+	jp nz, .set_bit_7
+	xor a
+	ret
+
+.wrap_around_down
+	ld [hl], $1
+	xor a
+	ret
+
+.d_up
+	ld hl, wMenuCursorY
+	ld a, [hl]
+	dec a
+	jr z, .check_wrap_around_up
+	ld [hl], a
+	xor a
+	ret
+
+.check_wrap_around_up
+	ld a, [w2DMenuFlags1]
+	bit 5, a
+	jr nz, .wrap_around_up
+	bit 2, a
+	jp nz, .set_bit_7
+	xor a
+	ret
+
+.wrap_around_up
+	ld a, [w2DMenuNumRows]
+	ld [hl], a
+	xor a
+	ret
+
+.d_left
+	ld hl, wMenuCursorX
+	ld a, [hl]
+	dec a
+	jr z, .check_wrap_around_left
+	ld [hl], a
+	xor a
+	ret
+
+.check_wrap_around_left
+	ld a, [w2DMenuFlags1]
+	bit 4, a
+	jr nz, .wrap_around_left
+	bit 1, a
+	jp nz, .set_bit_7
+	xor a
+	ret
+
+.wrap_around_left
+	ld a, [w2DMenuNumCols]
+	ld [hl], a
+	xor a
+	ret
+
+.d_right
+	ld hl, wMenuCursorX
+	ld a, [w2DMenuNumCols]
+	cp [hl]
+	jr z, .check_wrap_around_right
+	inc [hl]
+	xor a
+	ret
+
+.check_wrap_around_right
+	ld a, [w2DMenuFlags1]
+	bit 4, a
+	jr nz, .wrap_around_right
+	bit 0, a
+	jp nz, .set_bit_7
+	xor a
+	ret
+
+.wrap_around_right
+	ld [hl], $1
+	xor a
+	ret
+
+.a_b_start_select
+	xor a
+	ret
+
+Move2DMenuCursor:
+	ld hl, wCursorCurrentTile
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	ld a, [hl]
+	cp "▶"
+	jr nz, Place2DMenuCursor
+	ld a, [wCursorOffCharacter]
+	ld [hl], a
+Place2DMenuCursor:
+	ld a, [w2DMenuCursorInitY]
+	ld b, a
+	ld a, [w2DMenuCursorInitX]
+	ld c, a
+	call Coord2Tile
+	ld a, [w2DMenuCursorOffsets]
+	swap a
+	and $f
+	ld c, a
+	ld a, [wMenuCursorY]
+	ld b, a
+	xor a
+	dec b
+	jr z, .got_row
+.row_loop
+	add c
+	dec b
+	jr nz, .row_loop
+
+.got_row
+	ld c, SCREEN_WIDTH
+	call AddNTimes
+	ld a, [w2DMenuCursorOffsets]
+	and $f
+	ld c, a
+	ld a, [wMenuCursorX]
+	ld b, a
+	xor a
+	dec b
+	jr z, .got_col
+.col_loop
+	add c
+	dec b
+	jr nz, .col_loop
+
+.got_col
+	ld c, a
+	add hl, bc
+	ld a, [hl]
+	cp "▶"
+	jr z, .cursor_on
+	ld [wCursorOffCharacter], a
+	ld [hl], "▶"
+
+.cursor_on
+	ld a, l
+	ld [wCursorCurrentTile], a
+	ld a, h
+	ld [wCursorCurrentTile + 1], a
+	ret
+
+_PushWindow::
+	xor a ; BANK(sWindowStack)
+	call OpenSRAM
+
+	ld hl, wWindowStackPointer
+	ld e, [hl]
+	inc hl
+	ld d, [hl]
+	push de
+	ld b, $10
+	ld hl, wMenuFlags
+.loop
+	ld a, [hli]
+	ld [de], a
+	dec de
+	dec b
+	jr nz, .loop
+
+; If bit 6 or 7 of the menu flags is set, set bit 0 of the address
+; at 7:[wWindowStackPointer], and draw the menu using the coordinates from the header.
+; Otherwise, reset bit 0 of 7:[wWindowStackPointer].
+	ld a, [wMenuFlags]
+	bit 6, a
+	jr nz, .bit_6
+	bit 7, a
+	jr z, .not_bit_7
+
+.bit_6
+	ld hl, wWindowStackPointer
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	set 0, [hl]
+	call MenuBoxCoord2Tile
+	call GetMenuBoxDims
+	inc b
+	inc c
+	call .ret ; empty function
+
+.row
+	push bc
+	push hl
+
+.col
+	ld a, [hli]
+	ld [de], a
+	dec de
+	dec c
+	jr nz, .col
+
+	pop hl
+	ld bc, SCREEN_WIDTH
+	add hl, bc
+	pop bc
+	dec b
+	jr nz, .row
+	jr .done
+
+.not_bit_7
+	pop hl ; last-pushed register was de
+	push hl
+	ld a, [hld]
+	ld l, [hl]
+	ld h, a
+	res 0, [hl]
+
+.done
+	pop hl
+	call .ret ; empty function
+	ld a, h
+	ld [de], a
+	dec de
+	ld a, l
+	ld [de], a
+	dec de
+	ld hl, wWindowStackPointer
+	ld [hl], e
+	inc hl
+	ld [hl], d
+
+	call CloseSRAM
+	ld hl, wWindowStackSize
+	inc [hl]
+	ret
+
+.ret
+	ret
+
+_ExitMenu::
+	xor a
+	ldh [hBGMapMode], a
+
+	xor a ; BANK(sWindowStack)
+	call OpenSRAM
+
+	call GetWindowStackTop
+	ld a, l
+	or h
+	jp z, Error_Cant_ExitMenu
+	ld a, l
+	ld [wWindowStackPointer], a
+	ld a, h
+	ld [wWindowStackPointer + 1], a
+	call PopWindow
+	ld a, [wMenuFlags]
+	bit 0, a
+	jr z, .loop
+	ld d, h
+	ld e, l
+	call RestoreTileBackup
+
+.loop
+	call GetWindowStackTop
+	ld a, h
+	or l
+	jr z, .done
+	call PopWindow
+
+.done
+	call CloseSRAM
+	ld hl, wWindowStackSize
+	dec [hl]
+	call Function2434b
+	ld a, [wSpriteUpdatesEnabled]
+	cp 0
+	ret z
+
+	call Functiond2a
+	ret
+
+Function2434b:
+	ld a, [wVramState]
+	bit 0, a
+	ret z
+	xor a ; sScratch
+	call OpenSRAM
+	hlcoord 0, 0
+	ld de, sScratch
+	ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
+	call CopyBytes
+	call CloseSRAM
+	call OverworldTextModeSwitch
+	xor a ; sScratch
+	call OpenSRAM
+	ld hl, sScratch
+	decoord 0, 0
+	ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
+.loop
+	ld a, [hl]
+	cp $61
+	jr c, .next
+	ld [de], a
+.next
+	inc hl
+	inc de
+	dec bc
+	ld a, c
+	or b
+	jr nz, .loop
+	call CloseSRAM
+	ret
+
+Error_Cant_ExitMenu:
+	ld hl, .WindowPoppingErrorText
+	call PrintText
+	call WaitBGMap
+.infinite_loop
+	jr .infinite_loop
+
+.WindowPoppingErrorText:
+	text_far _WindowPoppingErrorText
+	text_end
+
+_InitVerticalMenuCursor::
+	ld a, [wMenuDataFlags]
+	ld b, a
+	ld hl, w2DMenuCursorInitY
+	ld a, [wMenuBorderTopCoord]
+	inc a
+	bit 6, b
+	jr nz, .skip_offset
+	inc a
+.skip_offset
+	ld [hli], a
+; w2DMenuCursorInitX
+	ld a, [wMenuBorderLeftCoord]
+	inc a
+	ld [hli], a
+; w2DMenuNumRows
+	ld a, [wMenuDataItems]
+	ld [hli], a
+; w2DMenuNumCols
+	ld a, 1
+	ld [hli], a
+; w2DMenuFlags1
+	ld [hl], $0
+	bit 5, b
+	jr z, .skip_bit_5
+	set 5, [hl]
+.skip_bit_5
+	ld a, [wMenuFlags]
+	bit 4, a
+	jr z, .skip_bit_6
+	set 6, [hl]
+.skip_bit_6
+	inc hl
+; w2DMenuFlags2
+	xor a
+	ld [hli], a
+; w2DMenuCursorOffsets
+	ln a, 2, 0
+	ld [hli], a
+; wMenuJoypadFilter
+	ld a, A_BUTTON
+	bit 0, b
+	jr nz, .skip_bit_1
+	add B_BUTTON
+.skip_bit_1
+	ld [hli], a
+; wMenuCursorY
+	ld a, [wMenuCursorBuffer]
+	and a
+	jr z, .load_at_the_top
+	ld c, a
+	ld a, [wMenuDataItems]
+	cp c
+	jr nc, .load_position
+.load_at_the_top
+	ld c, 1
+.load_position
+	ld [hl], c
+	inc hl
+; wMenuCursorX
+	ld a, 1
+	ld [hli], a
+; wCursorOffCharacter, wCursorCurrentTile
+	xor a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ret