Merge pull request #110 from ElectroDeoxys/master

Split Home bank

1 files changed, 86 insertions, 0 deletions

diff --git a/src/home/memory.asm b/src/home/memory.asm
new file mode 100644
index 0000000..c5c3317
--- /dev/null
+++ b/src/home/memory.asm
@@ -0,0 +1,86 @@
+; decompresses data from a given bank
+; uses values initialized by InitDataDecompression
+; input:
+; bc = row width
+; de = buffer to place decompressed data
+DecompressDataFromBank:
+	ldh a, [hBankROM]
+	push af
+	ld a, [wTempPointerBank]
+	call BankswitchROM
+	call DecompressData
+	pop af
+	call BankswitchROM
+	ret
+
+; Copies bc bytes from [wTempPointer] to de
+CopyBankedDataToDE:
+	ldh a, [hBankROM]
+	push af
+	push hl
+	ld a, [wTempPointerBank]
+	call BankswitchROM
+	ld a, [wTempPointer]
+	ld l, a
+	ld a, [wTempPointer + 1]
+	ld h, a
+	call CopyDataHLtoDE_SaveRegisters
+	pop hl
+	pop af
+	call BankswitchROM
+	ret
+
+; fill bc bytes of data at hl with a
+FillMemoryWithA:
+	push hl
+	push de
+	push bc
+	ld e, a
+.loop
+	ld [hl], e
+	inc hl
+	dec bc
+	ld a, b
+	or c
+	jr nz, .loop
+	pop bc
+	pop de
+	pop hl
+	ret
+
+; fill 2*bc bytes of data at hl with d,e
+FillMemoryWithDE:
+	push hl
+	push bc
+.loop
+	ld [hl], e
+	inc hl
+	ld [hl], d
+	inc hl
+	dec bc
+	ld a, b
+	or c
+	jr nz, .loop
+	pop bc
+	pop hl
+	ret
+
+; gets far byte a:hl, outputs value in a
+GetFarByte:
+	push hl
+	push af
+	ldh a, [hBankROM]
+	push af
+	push hl
+	ld hl, sp+$05
+	ld a, [hl]
+	call BankswitchROM
+	pop hl
+	ld a, [hl]
+	ld hl, sp+$03
+	ld [hl], a
+	pop af
+	call BankswitchROM
+	pop af
+	pop hl
+	ret