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INCLUDE "constants.asm"
SECTION "Overworld fade", ROMX[$433e],BANK[$23]
OverworldFadeIn:: ; 23:433e
ld c, 0
call GetFadeStep
ld b, 4
call FadeTowardsWhite
ret
OverworldFadeOut:: ; 23:4349
ld c, 9
call GetFadeStep
ld b, 4
call FadeTowardsBlack
ret
; TODO: merge this
SECTION "Palette fading, part 2?", ROMX[$43d1],BANK[$23]
ApplyPalettesAtHL:: ; 23:43d1
push hl
ld a, [hli]
ld [rBGP], a
ld a, [hli]
ld [rOBP0], a
ld a, [hli]
ld [rOBP1], a
pop hl
ret
FadeTowardsWhite:: ; 23:43dd
call ApplyPalettesAtHL
inc hl
inc hl
inc hl
ld c, 8
call DelayFrames
dec b
jr nz, FadeTowardsWhite
ret
FadeTowardsBlack:: ; 23:43ec
call ApplyPalettesAtHL
dec hl
dec hl
dec hl
ld c, 8
call DelayFrames
dec b
jr nz, FadeTowardsBlack
ret
GetFadeStep:: ; 23:43fb
ld a, [wTimeOfDayPal]
and 3
push bc
ld c, a
ld b, 0
ld hl, .sequences
add hl, bc
add hl, bc
ld a, [hli]
ld h, [hl]
ld l, a
pop bc
ld b, 0
add hl, bc
ret
.sequences
dw .sequence0
dw .sequence1
dw .sequence2
dw .sequence3
.sequence0
db $ff, $ff, $ff
db $fe, $fe, $fe
db $f9, $e4, $e4
db $e4, $d0, $d0
db $90, $80, $80
db $40, $40, $40
db $00, $00, $00
.sequence1
db $ff, $ff, $ff
db $fe, $fe, $fe
db $f9, $e4, $e4
db $e9, $d0, $d0
db $90, $80, $80
db $40, $40, $40
db $00, $00, $00
.sequence2
db $ff, $ff, $ff
db $fe, $fe, $ff
db $f9, $e4, $ff
db $f9, $d0, $ff
db $90, $80, $90
db $40, $40, $40
db $00, $00, $00
.sequence3
db $ff, $ff, $ff
db $fe, $fe, $fe
db $f9, $e4, $e4
db $e8, $d0, $d0
db $90, $80, $80
db $40, $40, $40
db $00, $00, $00
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