1 files changed, 51 insertions, 0 deletions
diff --git a/home/overworld.asm b/home/overworld.asm
index acc108c7..0408bf32 100644
--- a/home/overworld.asm
+++ b/home/overworld.asm
@@ -2421,3 +2421,54 @@ ForceBikeOrSurf::
 	ld hl, LoadPlayerSpriteGraphics
 	call Bankswitch
 	jp PlayDefaultMusic ; update map/player state?
+
+CheckForUserInterruption::
+; Return carry if Up+Select+B, Start or A are pressed in c frames.
+; Used only in the intro and title screen.
+	call DelayFrame
+
+	push bc
+	call JoypadLowSensitivity
+	pop bc
+
+	ldh a, [hJoyHeld]
+	cp D_UP + SELECT + B_BUTTON
+	jr z, .input
+
+	ldh a, [hJoy5]
+	and START | A_BUTTON
+	jr nz, .input
+
+	dec c
+	jr nz, CheckForUserInterruption
+
+	and a
+	ret
+
+.input
+	scf
+	ret
+
+; function to load position data for destination warp when switching maps
+; INPUT:
+; a = ID of destination warp within destination map
+LoadDestinationWarpPosition::
+	ld b, a
+	ldh a, [hLoadedROMBank]
+	push af
+	ld a, [wPredefParentBank]
+	ldh [hLoadedROMBank], a
+	ld [MBC1RomBank], a
+	ld a, b
+	add a
+	add a
+	ld c, a
+	ld b, 0
+	add hl, bc
+	ld bc, 4
+	ld de, wCurrentTileBlockMapViewPointer
+	call CopyData
+	pop af
+	ldh [hLoadedROMBank], a
+	ld [MBC1RomBank], a
+	ret