Sync with pokered

1 files changed, 65 insertions, 0 deletions

diff --git a/home/pathfinding.asm b/home/pathfinding.asm
new file mode 100644
index 00000000..53f98847
--- /dev/null
+++ b/home/pathfinding.asm
@@ -0,0 +1,65 @@
+; calculates the difference |a-b|, setting carry flag if a<b
+CalcDifference::
+	sub b
+	ret nc
+	cpl
+	add $1
+	scf
+	ret
+
+MoveSprite::
+; move the sprite [hSpriteIndex] with the movement pointed to by de
+; actually only copies the movement data to wNPCMovementDirections for later
+	call SetSpriteMovementBytesToFF
+MoveSprite_::
+	push hl
+	push bc
+	call GetSpriteMovementByte1Pointer
+	xor a
+	ld [hl], a
+	ld hl, wNPCMovementDirections
+	ld c, 0
+
+.loop
+	ld a, [de]
+	ld [hli], a
+	inc de
+	inc c
+	cp -1 ; have we reached the end of the movement data?
+	jr nz, .loop
+
+	ld a, c
+	ld [wNPCNumScriptedSteps], a ; number of steps taken
+
+	pop bc
+	ld hl, wd730
+	set 0, [hl]
+	pop hl
+	xor a
+	ld [wOverrideSimulatedJoypadStatesMask], a
+	ld [wSimulatedJoypadStatesEnd], a
+	dec a
+	ld [wJoyIgnore], a
+	ld [wWastedByteCD3A], a
+	ret
+
+; divides [hDividend2] by [hDivisor2] and stores the quotient in [hQuotient2]
+DivideBytes::
+	push hl
+	ld hl, hQuotient2
+	xor a
+	ld [hld], a
+	ld a, [hld]
+	and a
+	jr z, .done
+	ld a, [hli]
+.loop
+	sub [hl]
+	jr c, .done
+	inc hl
+	inc [hl]
+	dec hl
+	jr .loop
+.done
+	pop hl
+	ret