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INCLUDE "constants.asm"
SECTION "home/lcd.asm", ROM0
LCD::
push af
ldh a, [hLCDCPointer]
and a
jr z, .done
push hl
rla
jr c, .try_hide_sprites
ld a, [rLY]
ld l, a
ld h, HIGH(wLYOverrides)
ld h, [hl]
ldh a, [hLCDCPointer]
ld l, a
ld a, h
ld h, $FF
ld [hl], a
pop hl
pop af
reti
.try_hide_sprites
ld a, [rLY]
cp $80
jr nz, .dont_hide
ld hl, rLCDC
res 1, [hl]
.dont_hide
pop hl
pop af
reti
; Seems unused?
ldh a, [hSCX]
ld [rSCX], a
ldh a, [hSCY]
ld [rSCY], a
pop hl
.done
pop af
reti
; TODO: can this be done using `sine_table`?
db 0, 1, 2, 2, 3, 3, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 0, -1, -2, -2, -3, -3, -4, -4, -4, -4, -4, -3, -3, -2, -2, -1
DisableLCD::
ld a, [rLCDC]
bit 7, a
ret z
xor a
ld [rIF], a
ld a, [rIE]
ld b, a
res 0, a
ld [rIE], a
.wait
ld a, [rLY]
cp LY_VBLANK + 1
jr nz, .wait
ld a, [rLCDC]
and $7f ; Shut LCD down
ld [rLCDC], a
xor a
ld [rIF], a
ld a, b
ld [rIE], a
ret
EnableLCD::
ld a, [rLCDC]
set 7, a
ld [rLCDC], a
ret
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