From 80153b820ad017b09b7f896f0fb17beaf49faa95 Mon Sep 17 00:00:00 2001
From: libjet <libj3t@gmail.com>
Date: Tue, 18 Feb 2020 03:32:24 +0000
Subject: Add clear_sprites.asm

---
 engine/overworld/map_object_action.asm |  2 +-
 engine/variables.asm                   |  2 +-
 home.asm                               | 30 +++++-------------------------
 home/clear_sprites.asm                 | 23 +++++++++++++++++++++++
 4 files changed, 30 insertions(+), 27 deletions(-)
 create mode 100755 home/clear_sprites.asm

diff --git a/engine/overworld/map_object_action.asm b/engine/overworld/map_object_action.asm
index 40499b50..553243c4 100755
--- a/engine/overworld/map_object_action.asm
+++ b/engine/overworld/map_object_action.asm
@@ -9,7 +9,7 @@
 	ld a, [hli]
 	ld h, [hl]
 	ld l, a
-	call jp_hl
+	call _hl_
 	ret
 
 Pointers4460:
diff --git a/engine/variables.asm b/engine/variables.asm
index e2a399f0..7e6906ee 100755
--- a/engine/variables.asm
+++ b/engine/variables.asm
@@ -25,7 +25,7 @@ GetVarAction_::
 	jr .loadstringbuffer2
 
 .call
-	call jp_de
+	call _de_
 	ret
 
 .loadstringbuffer2
diff --git a/home.asm b/home.asm
index 0ddd8f15..93eadf05 100644
--- a/home.asm
+++ b/home.asm
@@ -143,35 +143,15 @@ INCLUDE "home/item.asm"
 INCLUDE "home/random.asm"
 INCLUDE "home/sram.asm"
 
-jp_hl::
+; Register aliases
+_hl_::
 	jp hl
 
-jp_de::
+_de_::
 	push de
 	ret
 
-ClearSprites:: ; 30ff (0:30ff)
-	ld hl, wVirtualOAM
-	ld b, $a0
-	xor a
-.asm_3105
-	ld [hli], a
-	dec b
-	jr nz, .asm_3105
-	ret
-
-HideSprites::
-	ld hl, wVirtualOAM
-	ld de, $4
-	ld b, $28
-	ld a, $a0
-.asm_3114
-	ld [hl], a
-	add hl, de
-	dec b
-	jr nz, .asm_3114
-	ret
-
+INCLUDE "home/clear_sprites.asm"
 INCLUDE "home/copy2.asm"
 
 BackUpTilesToBuffer::
@@ -619,7 +599,7 @@ Function3414::
 	ld a, [hli]
 	ld h, [hl]
 	ld l, a
-	call jp_hl
+	call _hl_
 	pop hl
 	ld a, h
 	rst Bankswitch
diff --git a/home/clear_sprites.asm b/home/clear_sprites.asm
new file mode 100755
index 00000000..cbf6e78b
--- /dev/null
+++ b/home/clear_sprites.asm
@@ -0,0 +1,23 @@
+ClearSprites::
+; Erase OAM data
+	ld hl, wVirtualOAM
+	ld b, wVirtualOAMEnd - wVirtualOAM
+	xor a
+.loop
+	ld [hli], a
+	dec b
+	jr nz, .loop
+	ret
+
+HideSprites::
+; Set all OAM y-positions to 160 to hide them offscreen
+	ld hl, wVirtualOAMSprite00YCoord
+	ld de, SPRITEOAMSTRUCT_LENGTH
+	ld b, NUM_SPRITE_OAM_STRUCTS
+	ld a, SCREEN_WIDTH_PX
+.loop
+	ld [hl], a ; y
+	add hl, de
+	dec b
+	jr nz, .loop
+	ret
\ No newline at end of file
-- 
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