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; initialize the screen by emptying the tilemap. used during screen transitions
EmptyScreen:
call DisableLCD
call FillTileMap
xor a
ld [wDuelDisplayedScreen], a
ld a, [wConsole]
cp CONSOLE_SGB
ret nz
call EnableLCD
ld hl, AttrBlkPacket_EmptyScreen
call SendSGB
call DisableLCD
ret
AttrBlkPacket_EmptyScreen:
sgb ATTR_BLK, 1 ; sgb_command, length
db 1 ; number of data sets
; Control Code, Color Palette Designation, X1, Y1, X2, Y2
db ATTR_BLK_CTRL_INSIDE + ATTR_BLK_CTRL_LINE, 0 << 0 + 0 << 2, 0, 0, 19, 17 ; data set 1
ds 6 ; data set 2
ds 2 ; data set 3
; returns v*BGMap0 + BG_MAP_WIDTH * c + b in de.
; used to map coordinates at bc to a BGMap0 address.
BCCoordToBGMap0Address:
ld l, c
ld h, $0
add hl, hl
add hl, hl
add hl, hl
add hl, hl
add hl, hl
ld c, b
ld b, HIGH(v0BGMap0)
add hl, bc
ld e, l
ld d, h
ret
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