Start reorganizing pokeyellow

1 files changed, 122 insertions, 0 deletions

diff --git a/engine/movie/title_rb.asm b/engine/movie/title_rb.asm
new file mode 100755
index 00000000..df630b53
--- /dev/null
+++ b/engine/movie/title_rb.asm
@@ -0,0 +1,122 @@
+; Leftover of Red/Blue. Seemingly unused
+
+TitleScroll_WaitBall:
+; Wait around for the TitleBall animation to play out.
+; hi: speed
+; lo: duration
+	db $05, $05, 0
+
+TitleScroll_In:
+; Scroll a TitleMon in from the right.
+; hi: speed
+; lo: duration
+	db $a2, $94, $84, $63, $52, $31, $11, 0
+
+TitleScroll_Out:
+; Scroll a TitleMon out to the left.
+; hi: speed
+; lo: duration
+	db $12, $22, $32, $42, $52, $62, $83, $93, 0
+
+TitleScroll:
+	ld a, d
+
+	ld bc, TitleScroll_In
+	ld d, $88
+	ld e, 0 ; don't animate titleball
+
+	and a
+	jr nz, .ok
+
+	ld bc, TitleScroll_Out
+	ld d, $00
+	ld e, 0 ; don't animate titleball
+.ok
+
+_TitleScroll:
+	ld a, [bc]
+	and a
+	ret z
+
+	inc bc
+	push bc
+
+	ld b, a
+	and $f
+	ld c, a
+	ld a, b
+	and $f0
+	swap a
+	ld b, a
+
+.loop
+	ld h, d
+	ld l, $48
+	call .ScrollBetween
+
+	ld h, $00
+	ld l, $88
+	call .ScrollBetween
+
+	ld a, d
+	add b
+	ld d, a
+
+	call GetTitleBallY
+	dec c
+	jr nz, .loop
+
+	pop bc
+	jr _TitleScroll
+
+.ScrollBetween:
+.wait
+	ldh a, [rLY] ; rLY
+	cp l
+	jr nz, .wait
+
+	ld a, h
+	ldh [rSCX], a
+
+.wait2
+	ldh a, [rLY] ; rLY
+	cp h
+	jr z, .wait2
+	ret
+
+TitleBallYTable:
+; OBJ y-positions for the Poke Ball held by Red in the title screen.
+; This is really two 0-terminated lists. Initiated with an index of 1.
+	db 0, $71, $6f, $6e, $6d, $6c, $6d, $6e, $6f, $71, $74, 0
+
+TitleScreenAnimateBallIfStarterOut:
+; Animate the TitleBall if a starter just got scrolled out.
+	ld a, [wTitleScreenScene]
+	cp STARTER1
+	jr z, .ok
+	cp STARTER2
+	jr z, .ok
+	cp STARTER3
+	ret nz
+.ok
+	ld e, 1 ; animate titleball
+	ld bc, TitleScroll_WaitBall
+	ld d, 0
+	jp _TitleScroll
+
+GetTitleBallY:
+; Get position e from TitleBallYTable
+	push de
+	push hl
+	xor a
+	ld d, a
+	ld hl, TitleBallYTable
+	add hl, de
+	ld a, [hl]
+	pop hl
+	pop de
+	and a
+	ret z
+	ld [wOAMBuffer + $28], a
+	inc e
+	ret