2 files changed, 171 insertions, 0 deletions
diff --git a/engine/menus/savemenu_copytilemapatonce.asm b/engine/menus/savemenu_copytilemapatonce.asm
new file mode 100755
index 00000000..4b567a58
--- /dev/null
+++ b/engine/menus/savemenu_copytilemapatonce.asm
@@ -0,0 +1,84 @@
+SaveMenu_CopyTilemapAtOnce:
+	ldh a, [hCGB]
+	and a
+	jp z, WaitBGMap
+
+; The following is a modified version of CopyTilemapAtOnce
+; that waits for [rLY] to be $60 instead of $80 - 1.
+	ldh a, [hBGMapMode]
+	push af
+	xor a
+	ldh [hBGMapMode], a
+
+	ldh a, [hMapAnims]
+	push af
+	xor a
+	ldh [hMapAnims], a
+
+.wait
+	ldh a, [rLY]
+	cp $60
+	jr c, .wait
+
+	di
+	ld a, BANK(vBGMap2)
+	ldh [rVBK], a
+	hlcoord 0, 0, wAttrmap
+	call .CopyBGMapViaStack
+	ld a, BANK(vBGMap0)
+	ldh [rVBK], a
+	hlcoord 0, 0
+	call .CopyBGMapViaStack
+
+.wait2
+	ldh a, [rLY]
+	cp $60
+	jr c, .wait2
+	ei
+
+	pop af
+	ldh [hMapAnims], a
+	pop af
+	ldh [hBGMapMode], a
+	ret
+
+.CopyBGMapViaStack:
+; Copy all tiles to vBGMap
+	ld [hSPBuffer], sp
+	ld sp, hl
+	ldh a, [hBGMapAddress + 1]
+	ld h, a
+	ld l, 0
+	ld a, SCREEN_HEIGHT
+	ldh [hTilesPerCycle], a
+	ld b, 1 << 1 ; not in v/hblank
+	ld c, LOW(rSTAT)
+
+.loop
+rept SCREEN_WIDTH / 2
+	pop de
+; if in v/hblank, wait until not in v/hblank
+.loop\@
+	ldh a, [c]
+	and b
+	jr nz, .loop\@
+; load vBGMap
+	ld [hl], e
+	inc l
+	ld [hl], d
+	inc l
+endr
+
+	ld de, BG_MAP_WIDTH - SCREEN_WIDTH
+	add hl, de
+	ldh a, [hTilesPerCycle]
+	dec a
+	ldh [hTilesPerCycle], a
+	jr nz, .loop
+
+	ldh a, [hSPBuffer]
+	ld l, a
+	ldh a, [hSPBuffer + 1]
+	ld h, a
+	ld sp, hl
+	ret
diff --git a/engine/phone/phonering_copytilemapatonce.asm b/engine/phone/phonering_copytilemapatonce.asm
new file mode 100755
index 00000000..6ce141b5
--- /dev/null
+++ b/engine/phone/phonering_copytilemapatonce.asm
@@ -0,0 +1,87 @@
+PhoneRing_CopyTilemapAtOnce:
+	ldh a, [hCGB]
+	and a
+	jp z, WaitBGMap
+	ld a, [wSpriteUpdatesEnabled]
+	cp $0
+	jp z, WaitBGMap
+
+; The following is a modified version of CopyTilemapAtOnce
+; that waits for [rLY] to be LY_VBLANK - 1 instead of $80 - 1.
+	ldh a, [hBGMapMode]
+	push af
+	xor a
+	ldh [hBGMapMode], a
+
+	ldh a, [hMapAnims]
+	push af
+	xor a
+	ldh [hMapAnims], a
+
+.wait
+	ldh a, [rLY]
+	cp LY_VBLANK - 1
+	jr c, .wait
+
+	di
+	ld a, BANK(vBGMap2)
+	ldh [rVBK], a
+	hlcoord 0, 0, wAttrmap
+	call .CopyBGMapViaStack
+	ld a, BANK(vBGMap0)
+	ldh [rVBK], a
+	hlcoord 0, 0
+	call .CopyBGMapViaStack
+
+.wait2
+	ldh a, [rLY]
+	cp LY_VBLANK - 1
+	jr c, .wait2
+	ei
+
+	pop af
+	ldh [hMapAnims], a
+	pop af
+	ldh [hBGMapMode], a
+	ret
+
+.CopyBGMapViaStack:
+; Copy all tiles to vBGMap
+	ld [hSPBuffer], sp
+	ld sp, hl
+	ldh a, [hBGMapAddress + 1]
+	ld h, a
+	ld l, 0
+	ld a, SCREEN_HEIGHT
+	ldh [hTilesPerCycle], a
+	ld b, 1 << 1 ; not in v/hblank
+	ld c, LOW(rSTAT)
+
+.loop
+rept SCREEN_WIDTH / 2
+	pop de
+; if in v/hblank, wait until not in v/hblank
+.loop\@
+	ldh a, [c]
+	and b
+	jr nz, .loop\@
+; load vBGMap
+	ld [hl], e
+	inc l
+	ld [hl], d
+	inc l
+endr
+
+	ld de, BG_MAP_WIDTH - SCREEN_WIDTH
+	add hl, de
+	ldh a, [hTilesPerCycle]
+	dec a
+	ldh [hTilesPerCycle], a
+	jr nz, .loop
+
+	ldh a, [hSPBuffer]
+	ld l, a
+	ldh a, [hSPBuffer + 1]
+	ld h, a
+	ld sp, hl
+	ret