pokecrystal/engine/tilesets/timeofday_pals.asm

DummyPredef35:
DummyPredef36:
	ret

UpdateTimeOfDayPal::
	call UpdateTime
	ld a, [wTimeOfDay]
	ld [wCurTimeOfDay], a
	call GetTimePalette
	ld [wTimeOfDayPal], a
	ret

_TimeOfDayPals::
; return carry if pals are changed

; forced pals?
	ld hl, wTimeOfDayPalFlags
	bit 7, [hl]
	jr nz, .dontchange

; do we need to bother updating?
	ld a, [wTimeOfDay]
	ld hl, wCurTimeOfDay
	cp [hl]
	jr z, .dontchange

; if so, the time of day has changed
	ld a, [wTimeOfDay]
	ld [wCurTimeOfDay], a

; get palette id
	call GetTimePalette

; same palette as before?
	ld hl, wTimeOfDayPal
	cp [hl]
	jr z, .dontchange

; update palette id
	ld [wTimeOfDayPal], a

; save bg palette 7
	ld hl, wBGPals1 palette PAL_BG_TEXT

; save wram bank
	ldh a, [rSVBK]
	ld b, a

	ld a, BANK(wBGPals1)
	ldh [rSVBK], a

; push palette
	ld c, NUM_PAL_COLORS
.push
	ld d, [hl]
	inc hl
	ld e, [hl]
	inc hl
	push de
	dec c
	jr nz, .push

; restore wram bank
	ld a, b
	ldh [rSVBK], a

; update sgb pals
	ld b, SCGB_MAPPALS
	call GetSGBLayout

; restore bg palette 7
	ld hl, wOBPals1 - 1 ; last byte in wBGPals1

; save wram bank
	ldh a, [rSVBK]
	ld d, a

	ld a, BANK(wOBPals1)
	ldh [rSVBK], a

; pop palette
	ld e, NUM_PAL_COLORS
.pop
	pop bc
	ld [hl], c
	dec hl
	ld [hl], b
	dec hl
	dec e
	jr nz, .pop

; restore wram bank
	ld a, d
	ldh [rSVBK], a

; update palettes
	call _UpdateTimePals
	call DelayFrame

; successful change
	scf
	ret

.dontchange
; no change occurred
	and a
	ret

_UpdateTimePals::
	ld c, $9 ; normal
	call GetTimePalFade
	call DmgToCgbTimePals
	ret

FadeInPalettes::
	ld c, $12
	call GetTimePalFade
	ld b, $4
	call ConvertTimePalsDecHL
	ret

FadeOutPalettes::
	call FillWhiteBGColor
	ld c, $9
	call GetTimePalFade
	ld b, $4
	call ConvertTimePalsIncHL
	ret

BattleTowerFade:
	call FillWhiteBGColor
	ld c, $9
	call GetTimePalFade
	ld b, $4
.asm_8c09c
	call DmgToCgbTimePals
	inc hl
	inc hl
	inc hl
	ld c, $7
	call DelayFrames
	dec b
	jr nz, .asm_8c09c
	ret

FadeInQuickly:
	ld c, $0
	call GetTimePalFade
	ld b, $4
	call ConvertTimePalsIncHL
	ret

FadeBlackQuickly:
	ld c, $9
	call GetTimePalFade
	ld b, $4
	call ConvertTimePalsDecHL
	ret

FillWhiteBGColor:
	ldh a, [rSVBK]
	push af
	ld a, BANK(wBGPals1)
	ldh [rSVBK], a

	ld hl, wBGPals1
	ld a, [hli]
	ld e, a
	ld a, [hli]
	ld d, a
	ld hl, wBGPals1 + 1 palettes
	ld c, 6
.loop
	ld a, e
	ld [hli], a
	ld a, d
	ld [hli], a
rept 6
	inc hl
endr
	dec c
	jr nz, .loop

	pop af
	ldh [rSVBK], a
	ret

ReplaceTimeOfDayPals:
	ld hl, .BrightnessLevels
	ld a, [wMapTimeOfDay]
	cp $4 ; Dark cave, needs Flash
	jr z, .DarkCave
	and $7
	add l
	ld l, a
	ld a, $0
	adc h
	ld h, a
	ld a, [hl]
	ld [wTimeOfDayPalset], a
	ret

.DarkCave:
	ld a, [wStatusFlags]
	bit STATUSFLAGS_FLASH_F, a
	jr nz, .UsedFlash
	ld a, %11111111 ; 3, 3, 3, 3
	ld [wTimeOfDayPalset], a
	ret

.UsedFlash:
	ld a, %10101010 ; 2, 2, 2, 2
	ld [wTimeOfDayPalset], a
	ret

.BrightnessLevels:
	dc 3, 2, 1, 0
	dc 1, 1, 1, 1
	dc 2, 2, 2, 2
	dc 0, 0, 0, 0
	dc 3, 3, 3, 3
	dc 3, 2, 1, 0
	dc 3, 2, 1, 0
	dc 3, 2, 1, 0

GetTimePalette:
	ld a, [wTimeOfDay]
	ld e, a
	ld d, 0
	ld hl, .TimePalettes
	add hl, de
	add hl, de
	ld a, [hli]
	ld h, [hl]
	ld l, a
	jp hl

.TimePalettes:
	dw .MorningPalette
	dw .DayPalette
	dw .NitePalette
	dw .DarknessPalette

.MorningPalette:
	ld a, [wTimeOfDayPalset]
	and %00000011 ; 0
	ret

.DayPalette:
	ld a, [wTimeOfDayPalset]
	and %00001100 ; 1
	srl a
	srl a
	ret

.NitePalette:
	ld a, [wTimeOfDayPalset]
	and %00110000 ; 2
	swap a
	ret

.DarknessPalette:
	ld a, [wTimeOfDayPalset]
	and %11000000 ; 3
	rlca
	rlca
	ret

DmgToCgbTimePals:
	push hl
	push de
	ld a, [hli]
	call DmgToCgbBGPals
	ld a, [hli]
	ld e, a
	ld a, [hli]
	ld d, a
	call DmgToCgbObjPals
	pop de
	pop hl
	ret

ConvertTimePalsIncHL:
.loop
	call DmgToCgbTimePals
	inc hl
	inc hl
	inc hl
	ld c, 2
	call DelayFrames
	dec b
	jr nz, .loop
	ret

ConvertTimePalsDecHL:
.loop
	call DmgToCgbTimePals
	dec hl
	dec hl
	dec hl
	ld c, 2
	call DelayFrames
	dec b
	jr nz, .loop
	ret

GetTimePalFade:
; check cgb
	ldh a, [hCGB]
	and a
	jr nz, .cgb

; else: dmg

; index
	ld a, [wTimeOfDayPal]
	and %11

; get fade table
	push bc
	ld c, a
	ld b, $0
	ld hl, .dmgfades
	add hl, bc
	add hl, bc
	ld a, [hli]
	ld h, [hl]
	ld l, a
	pop bc

; get place in fade table
	ld b, $0
	add hl, bc
	ret

.cgb
	ld hl, .cgbfade
	ld b, $0
	add hl, bc
	ret

.dmgfades
	dw .morn
	dw .day
	dw .nite
	dw .darkness

.morn
	dc 3,3,3,3, 3,3,3,3, 3,3,3,3
	dc 3,3,3,2, 3,3,3,2, 3,3,3,2
	dc 3,3,2,1, 3,2,1,0, 3,2,1,0
	dc 3,2,1,0, 3,1,0,0, 3,1,0,0
	dc 2,1,0,0, 2,0,0,0, 2,0,0,0
	dc 1,0,0,0, 1,0,0,0, 1,0,0,0
	dc 0,0,0,0, 0,0,0,0, 0,0,0,0

.day
	dc 3,3,3,3, 3,3,3,3, 3,3,3,3
	dc 3,3,3,2, 3,3,3,2, 3,3,3,2
	dc 3,3,2,1, 3,2,1,0, 3,2,1,0
	dc 3,2,1,0, 3,1,0,0, 3,1,0,0
	dc 2,1,0,0, 2,0,0,0, 2,0,0,0
	dc 1,0,0,0, 1,0,0,0, 1,0,0,0
	dc 0,0,0,0, 0,0,0,0, 0,0,0,0

.nite
	dc 3,3,3,3, 3,3,3,3, 3,3,3,3
	dc 3,3,3,2, 3,3,3,2, 3,3,3,2
	dc 3,3,2,1, 3,2,1,0, 3,2,1,0
	dc 3,2,2,1, 3,1,0,0, 3,1,0,0
	dc 2,1,0,0, 2,0,0,0, 2,0,0,0
	dc 1,0,0,0, 1,0,0,0, 1,0,0,0
	dc 0,0,0,0, 0,0,0,0, 0,0,0,0

.darkness
	dc 3,3,3,3, 3,3,3,3, 3,3,3,3
	dc 3,3,3,2, 3,3,3,2, 3,3,3,3
	dc 3,3,3,2, 3,2,1,0, 3,3,3,3
	dc 3,3,3,1, 3,1,0,0, 3,3,3,3
	dc 3,3,3,1, 2,0,0,0, 3,3,3,3
	dc 0,0,0,0, 1,0,0,0, 0,0,0,0
	dc 0,0,0,0, 0,0,0,0, 0,0,0,0

.cgbfade
	dc 3,3,3,3, 3,3,3,3, 3,3,3,3
	dc 3,3,3,2, 3,3,3,2, 3,3,3,2
	dc 3,3,2,1, 3,3,2,1, 3,3,2,1
	dc 3,2,1,0, 3,2,1,0, 3,2,1,0
	dc 2,1,0,0, 2,1,0,0, 2,1,0,0
	dc 1,0,0,0, 1,0,0,0, 1,0,0,0
	dc 0,0,0,0, 0,0,0,0, 0,0,0,0