Merge pull request #263 from Rangi42/master

Syncing style with pokecrystal

1 files changed, 61 insertions, 0 deletions

diff --git a/home/tilemap.asm b/home/tilemap.asm
new file mode 100644
index 00000000..afee7097
--- /dev/null
+++ b/home/tilemap.asm
@@ -0,0 +1,61 @@
+FillMemory::
+; Fill bc bytes at hl with a.
+	push de
+	ld d, a
+.loop
+	ld a, d
+	ld [hli], a
+	dec bc
+	ld a, b
+	or c
+	jr nz, .loop
+	pop de
+	ret
+
+UncompressSpriteFromDE::
+; Decompress pic at a:de.
+	ld hl, wSpriteInputPtr
+	ld [hl], e
+	inc hl
+	ld [hl], d
+	jp UncompressSpriteData
+
+SaveScreenTilesToBuffer2::
+	hlcoord 0, 0
+	ld de, wTileMapBackup2
+	ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
+	call CopyData
+	ret
+
+LoadScreenTilesFromBuffer2::
+	call LoadScreenTilesFromBuffer2DisableBGTransfer
+	ld a, 1
+	ldh [hAutoBGTransferEnabled], a
+	ret
+
+; loads screen tiles stored in wTileMapBackup2 but leaves hAutoBGTransferEnabled disabled
+LoadScreenTilesFromBuffer2DisableBGTransfer::
+	xor a
+	ldh [hAutoBGTransferEnabled], a
+	ld hl, wTileMapBackup2
+	decoord 0, 0
+	ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
+	call CopyData
+	ret
+
+SaveScreenTilesToBuffer1::
+	hlcoord 0, 0
+	ld de, wTileMapBackup
+	ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
+	jp CopyData
+
+LoadScreenTilesFromBuffer1::
+	xor a
+	ldh [hAutoBGTransferEnabled], a
+	ld hl, wTileMapBackup
+	decoord 0, 0
+	ld bc, SCREEN_WIDTH * SCREEN_HEIGHT
+	call CopyData
+	ld a, 1
+	ldh [hAutoBGTransferEnabled], a
+	ret