1 files changed, 347 insertions, 0 deletions
diff --git a/engine/palettes.asm b/engine/palettes.asm
new file mode 100644
index 000000000..accaa96b5
--- /dev/null
+++ b/engine/palettes.asm
@@ -0,0 +1,347 @@
+; Functions dealing with palettes.
+
+
+UpdatePalsIfCGB: ; c2f
+; update bgp data from BGPals
+; update obp data from OBPals
+; return carry if successful
+
+; check cgb
+	ld a, [hCGB]
+	and a
+	ret z
+
+
+UpdateCGBPals: ; c33
+; return carry if successful
+; any pals to update?
+	ld a, [hCGBPalUpdate]
+	and a
+	ret z
+
+
+ForceUpdateCGBPals: ; c37
+
+	ld a, [rSVBK]
+	push af
+	ld a, 5 ; BANK(BGPals)
+	ld [rSVBK], a
+
+	ld hl, BGPals ; 5:d080
+
+; copy 8 pals to bgpd
+	ld a, %10000000 ; auto increment, index 0
+	ld [rBGPI], a
+	ld c, rBGPD % $100
+	ld b, 4 ; NUM_PALS / 2
+.bgp
+	rept $10
+	ld a, [hli]
+	ld [$ff00+c], a
+	endr
+
+	dec b
+	jr nz, .bgp
+	
+; hl is now 5:d0c0 OBPals
+	
+; copy 8 pals to obpd
+	ld a, %10000000 ; auto increment, index 0
+	ld [rOBPI], a
+	ld c, rOBPD - rJOYP
+	ld b, 4 ; NUM_PALS / 2
+.obp
+	rept $10
+	ld a, [hli]
+	ld [$ff00+c], a
+	endr
+
+	dec b
+	jr nz, .obp
+	
+	pop af
+	ld [rSVBK], a
+
+; clear pal update queue
+	xor a
+	ld [hCGBPalUpdate], a
+
+	scf
+	ret
+; c9f
+
+
+DmgToCgbBGPals: ; c9f
+; exists to forego reinserting cgb-converted image data
+
+; input: a -> bgp
+
+	ld [rBGP], a
+	push af
+
+	ld a, [hCGB]
+	and a
+	jr z, .end
+
+	push hl
+	push de
+	push bc
+	ld a, [rSVBK]
+	push af
+
+	ld a, 5
+	ld [rSVBK], a
+
+; copy & reorder bg pal buffer
+	ld hl, BGPals ; to
+	ld de, Unkn1Pals ; from
+; order
+	ld a, [rBGP]
+	ld b, a
+; all pals
+	ld c, 8
+	call CopyPals
+; request pal update
+	ld a, 1
+	ld [hCGBPalUpdate], a
+
+	pop af
+	ld [rSVBK], a
+	pop bc
+	pop de
+	pop hl
+.end
+	pop af
+	ret
+; ccb
+
+
+DmgToCgbObjPals: ; ccb
+; exists to forego reinserting cgb-converted image data
+
+; input: d -> obp1
+;        e -> obp2
+
+	ld a, e
+	ld [rOBP0], a
+	ld a, d
+	ld [rOBP1], a
+	
+	ld a, [hCGB]
+	and a
+	ret z
+
+	push hl
+	push de
+	push bc
+	ld a, [rSVBK]
+	push af
+
+	ld a, 5
+	ld [rSVBK], a
+
+; copy & reorder obj pal buffer
+	ld hl, OBPals ; to
+	ld de, Unkn2Pals ; from
+; order
+	ld a, [rOBP0]
+	ld b, a
+; all pals
+	ld c, 8
+	call CopyPals
+; request pal update
+	ld a, 1
+	ld [hCGBPalUpdate], a
+
+	pop af
+	ld [rSVBK], a
+	pop bc
+	pop de
+	pop hl
+	ret
+; cf8
+
+
+Functioncf8: ; cf8
+	ld [rOBP0], a
+	push af
+	ld a, [hCGB]
+	and a
+	jr z, .asm_d22
+	push hl
+	push de
+	push bc
+	ld a, [rSVBK]
+	push af
+	ld a, $5
+	ld [rSVBK], a
+	ld hl, $d0c0
+	ld de, MartPointer
+	ld a, [rOBP0]
+	ld b, a
+	ld c, $1
+	call CopyPals
+	ld a, $1
+	ld [hCGBPalUpdate], a
+	pop af
+	ld [rSVBK], a
+	pop bc
+	pop de
+	pop hl
+
+.asm_d22
+	pop af
+	ret
+; d24
+
+Functiond24: ; d24
+	ld [rOBP1], a
+	push af
+	ld a, [hCGB]
+	and a
+	jr z, .asm_d4e
+	push hl
+	push de
+	push bc
+	ld a, [rSVBK]
+	push af
+	ld a, $5
+	ld [rSVBK], a
+	ld hl, $d0c8
+	ld de, $d048
+	ld a, [rOBP1]
+	ld b, a
+	ld c, $1
+	call CopyPals
+	ld a, $1
+	ld [hCGBPalUpdate], a
+	pop af
+	ld [rSVBK], a
+	pop bc
+	pop de
+	pop hl
+
+.asm_d4e
+	pop af
+	ret
+; d50
+
+
+
+CopyPals: ; d50
+; copy c palettes in order b from de to hl
+
+	push bc
+	ld c, 4 ; NUM_PAL_COLORS
+.loop
+	push de
+	push hl
+	
+; get pal color
+	ld a, b
+	and %11 ; color
+; 2 bytes per color
+	add a
+	ld l, a
+	ld h, 0
+	add hl, de
+	ld e, [hl]
+	inc hl
+	ld d, [hl]
+	
+; dest
+	pop hl
+; write color
+	ld [hl], e
+	inc hl
+	ld [hl], d
+	inc hl
+; next pal color
+	srl b
+	srl b
+; source
+	pop de
+; done pal?
+	dec c
+	jr nz, .loop
+	
+; de += 8 (next pal)
+	ld a, 8 ; NUM_PAL_COLORS * 2 ; bytes per pal
+	add e
+	jr nc, .ok
+	inc d
+.ok
+	ld e, a
+	
+; how many more pals?
+	pop bc
+	dec c
+	jr nz, CopyPals
+	ret
+; d79
+
+
+Functiond79: ; d79
+	ld a, [hCGB]
+	and a
+	ret z
+	ld a, 1
+	ld [rVBK], a
+	ld hl, VTiles0
+	ld bc, $2000
+	xor a
+	call ByteFill
+	ld a, 0
+	ld [rVBK], a
+	ret
+; d90
+
+
+Functiond90: ; d90
+	ret
+; d91
+
+
+Functiond91: ; d91
+	ld a, [hCGB]
+	and a
+	ret z
+	ld a, [rSVBK]
+	push af
+	ld a, 5 ; BANK(BGPals)
+	ld [rSVBK], a
+	ld hl, BGPals
+	ld bc, $40 + $10
+	xor a
+	call ByteFill
+	pop af
+	ld [rSVBK], a
+	ld a, 1
+	ld [hCGBPalUpdate], a
+	call DelayFrame
+	ret
+; db1
+
+
+Functiondb1: ; db1
+	ld a, [hROMBank]
+	push af
+	ld a, BANK(Function4c000)
+	rst Bankswitch
+	call Function4c000
+	pop af
+	rst Bankswitch
+	ret
+; dbd
+
+Functiondbd: ; dbd
+	ld a, [hROMBank]
+	push af
+	ld a, BANK(Function4c03f)
+	rst Bankswitch
+	call Function4c03f
+	pop af
+	rst Bankswitch
+	ret
+; dc9
+