1 files changed, 103 insertions, 0 deletions
diff --git a/engine/overworld/init_map.asm b/engine/overworld/init_map.asm
new file mode 100644
index 000000000..2eb4998a6
--- /dev/null
+++ b/engine/overworld/init_map.asm
@@ -0,0 +1,103 @@
+ReanchorBGMap_NoOAMUpdate:: ; 6454
+	call DelayFrame
+	ld a, [hOAMUpdate]
+	push af
+
+	ld a, $1
+	ld [hOAMUpdate], a
+	ld a, [hBGMapMode]
+	push af
+	xor a
+	ld [hBGMapMode], a
+
+	call .ReanchorBGMap
+
+	pop af
+	ld [hBGMapMode], a
+	pop af
+	ld [hOAMUpdate], a
+	ld hl, wVramState
+	set 6, [hl]
+	ret
+
+.ReanchorBGMap:
+	xor a
+	ld [hLCDCPointer], a
+	ld [hBGMapMode], a
+	ld a, $90
+	ld [hWY], a
+	call OverworldTextModeSwitch
+	ld a, HIGH(vBGMap1)
+	call .LoadBGMapAddrIntoHRAM
+	call _OpenAndCloseMenu_HDMATransferTileMapAndAttrMap
+	farcall LoadOW_BGPal7
+	farcall ApplyPals
+	ld a, $1
+	ld [hCGBPalUpdate], a
+	xor a
+	ld [hBGMapMode], a
+	ld [hWY], a
+	farcall HDMATransfer_FillBGMap0WithBlack ; no need to farcall
+	ld a, HIGH(vBGMap0)
+	call .LoadBGMapAddrIntoHRAM
+	xor a ; LOW(vBGMap0)
+	ld [wBGMapAnchor], a
+	ld a, HIGH(vBGMap0)
+	ld [wBGMapAnchor + 1], a
+	xor a
+	ld [hSCX], a
+	ld [hSCY], a
+	call ApplyBGMapAnchorToObjects
+	ret
+
+.LoadBGMapAddrIntoHRAM: ; 64b9
+	ld [hBGMapAddress + 1], a
+	xor a
+	ld [hBGMapAddress], a
+	ret
+
+LoadFonts_NoOAMUpdate:: ; 64bf
+	ld a, [hOAMUpdate]
+	push af
+	ld a, $1
+	ld [hOAMUpdate], a
+
+	call .LoadGFX
+
+	pop af
+	ld [hOAMUpdate], a
+	ret
+
+.LoadGFX:
+	call LoadFontsExtra
+	ld a, $90
+	ld [hWY], a
+	call SafeUpdateSprites
+	call LoadStandardFont
+	ret
+
+HDMATransfer_FillBGMap0WithBlack: ; 64db
+	ld a, [rSVBK]
+	push af
+	ld a, BANK(wDecompressScratch)
+	ld [rSVBK], a
+
+	ld a, "■"
+	ld hl, wDecompressScratch
+	ld bc, wScratchAttrMap - wDecompressScratch
+	call ByteFill
+	ld a, HIGH(wDecompressScratch)
+	ld [rHDMA1], a
+	ld a, LOW(wDecompressScratch)
+	ld [rHDMA2], a
+	ld a, HIGH(vBGMap0 % $8000)
+	ld [rHDMA3], a
+	ld a, LOW(vBGMap0 % $8000)
+	ld [rHDMA4], a
+	ld a, $3f
+	ld [hDMATransfer], a
+	call DelayFrame
+
+	pop af
+	ld [rSVBK], a
+	ret