1 files changed, 431 insertions, 0 deletions
diff --git a/engine/copy.asm b/engine/copy.asm
new file mode 100644
index 000000000..c5ba92c65
--- /dev/null
+++ b/engine/copy.asm
@@ -0,0 +1,431 @@
+; Functions to copy data from ROM.
+
+
+Functiondc9: ; dc9
+	ld a, [rLCDC]
+	bit 7, a
+	jp z, Copy2bpp
+
+	ld a, [hROMBank]
+	push af
+	ld a, BANK(Function104284)
+	rst Bankswitch
+	call Function104284
+	pop af
+	rst Bankswitch
+
+	ret
+; ddc
+
+Functionddc: ; ddc
+	ld a, [rLCDC]
+	bit 7, a
+	jp z, Copy1bpp
+
+	ld a, [hROMBank]
+	push af
+	ld a, BANK(Function1042b2)
+	rst Bankswitch
+	call Function1042b2
+	pop af
+	rst Bankswitch
+
+	ret
+; def
+
+Functiondef: ; def
+	ld [hBuffer], a
+	ld a, [hROMBank]
+	push af
+	ld a, [hBuffer]
+	rst Bankswitch
+	call FarCopyBytesDouble
+	pop af
+	rst Bankswitch
+	ret
+; dfd
+
+Functiondfd: ; dfd
+	dec c
+	ld a, [hBGMapMode]
+	push af
+	xor a
+	ld [hBGMapMode], a
+	ld a, [hROMBank]
+	push af
+	ld a, b
+	rst Bankswitch
+
+.asm_e09
+	ld a, d
+	ld [rHDMA1], a
+	ld a, e
+	and $f0
+	ld [rHDMA2], a
+	ld a, h
+	and $1f
+	ld [rHDMA3], a
+	ld a, l
+	and $f0
+	ld [rHDMA4], a
+	ld a, c
+	cp $8
+	jr c, .asm_e3c
+	sub $8
+	ld c, a
+	ld a, $f
+	ld [hDMATransfer], a
+	call DelayFrame
+	ld a, l
+	add $0
+	ld l, a
+	ld a, h
+	adc $1
+	ld h, a
+	ld a, e
+	add $0
+	ld e, a
+	ld a, d
+	adc $1
+	ld d, a
+	jr .asm_e09
+
+.asm_e3c
+	ld a, c
+	and $7f
+	ld [hDMATransfer], a
+	call DelayFrame
+	pop af
+	rst Bankswitch
+
+	pop af
+	ld [hBGMapMode], a
+	ret
+; e4a
+
+
+
+Functione4a: ; e4a
+	ld a, $5
+	ld hl, $4135
+	rst FarCall
+	ret
+; e51
+
+
+
+Functione51: ; e51
+	ld a, $3e
+	ld hl, $7449
+	rst FarCall
+	ret
+; e58
+
+Functione58: ; e58
+	ld a, $3e
+	ld hl, $74be
+	rst FarCall
+	ret
+; e5f
+
+
+
+Functione5f: ; e5f
+	ld a, $3e
+	ld hl, $748a
+	rst FarCall
+	ld a, $3e
+	ld hl, $74b0
+	rst FarCall
+	ret
+; e6c
+
+Functione6c: ; e6c
+	ld a, $3e
+	ld hl, $74b0
+	rst FarCall
+	ret
+; e73
+
+Functione73: ; e73
+	push de
+	ld a, $0
+	call GetSRAMBank
+	push bc
+	ld de, $a000
+	ld a, b
+	call FarDecompress
+	pop bc
+	pop hl
+	ld de, $a000
+	call Request2bpp
+	call CloseSRAM
+	ret
+; e8d
+
+
+
+FarCopyBytes: ; e8d
+; copy bc bytes from a:hl to de
+
+	ld [hBuffer], a
+	ld a, [hROMBank]
+	push af
+	ld a, [hBuffer]
+	rst Bankswitch
+
+	call CopyBytes
+
+	pop af
+	rst Bankswitch
+	ret
+; 0xe9b
+
+
+FarCopyBytesDouble: ; e9b
+; Copy bc bytes from a:hl to bc*2 bytes at de,
+; doubling each byte in the process.
+
+	ld [hBuffer], a
+	ld a, [hROMBank]
+	push af
+	ld a, [hBuffer]
+	rst Bankswitch
+
+; switcheroo, de <> hl
+	ld a, h
+	ld h, d
+	ld d, a
+	ld a, l
+	ld l, e
+	ld e, a
+
+	inc b
+	inc c
+	jr .dec
+
+.loop
+	ld a, [de]
+	inc de
+	ld [hli], a
+	ld [hli], a
+.dec
+	dec c
+	jr nz, .loop
+	dec b
+	jr nz, .loop
+
+	pop af
+	rst Bankswitch
+	ret
+; 0xeba
+
+
+Request2bpp: ; eba
+	ld a, [hBGMapMode]
+	push af
+	xor a
+	ld [hBGMapMode], a
+
+	ld a, [hROMBank]
+	push af
+	ld a, b
+	rst Bankswitch
+
+	ld a, [$ffd3]
+	push af
+
+	ld a, $8
+	ld [$ffd3], a
+	ld a, [InLinkBattle]
+	cp $4
+	jr nz, .asm_edc
+	ld a, [$ffe9]
+	and a
+	jr nz, .asm_edc
+	ld a, $6
+	ld [$ffd3], a
+
+.asm_edc
+	ld a, e
+	ld [$cf68], a
+	ld a, d
+	ld [$cf69], a
+	ld a, l
+	ld [$cf6a], a
+	ld a, h
+	ld [$cf6b], a
+
+.asm_eec
+	ld a, c
+	ld hl, $ffd3
+	cp [hl]
+	jr nc, .asm_f08
+
+	ld [$cf67], a
+.wait
+	call DelayFrame
+	ld a, [$cf67]
+	and a
+	jr nz, .wait
+
+	pop af
+	ld [$ffd3], a
+
+	pop af
+	rst Bankswitch
+
+	pop af
+	ld [hBGMapMode], a
+	ret
+
+.asm_f08
+	ld a, [$ffd3]
+	ld [$cf67], a
+.asm_f0d
+	call DelayFrame
+	ld a, [$cf67]
+	and a
+	jr nz, .asm_f0d
+	ld a, c
+	ld hl, $ffd3
+	sub [hl]
+	ld c, a
+	jr .asm_eec
+; f1e
+
+
+Request1bpp: ; f1e
+	ld a, [hBGMapMode]
+	push af
+	xor a
+	ld [hBGMapMode], a
+
+	ld a, [hROMBank]
+	push af
+	ld a, b
+	rst Bankswitch
+
+	ld a, [$ffd3]
+	push af
+
+	ld a, $8
+	ld [$ffd3], a
+	ld a, [InLinkBattle]
+	cp $4
+	jr nz, .asm_f40
+	ld a, [$ffe9]
+	and a
+	jr nz, .asm_f40
+	ld a, $6
+	ld [$ffd3], a
+
+.asm_f40
+	ld a, e
+	ld [$cf6d], a
+	ld a, d
+	ld [$cf6e], a
+	ld a, l
+	ld [$cf6f], a
+	ld a, h
+	ld [$cf70], a
+.asm_f50
+	ld a, c
+	ld hl, $ffd3
+	cp [hl]
+	jr nc, .asm_f6c
+
+	ld [$cf6c], a
+.wait
+	call DelayFrame
+	ld a, [$cf6c]
+	and a
+	jr nz, .wait
+
+	pop af
+	ld [$ffd3], a
+
+	pop af
+	rst Bankswitch
+
+	pop af
+	ld [hBGMapMode], a
+	ret
+
+.asm_f6c
+	ld a, [$ffd3]
+	ld [$cf6c], a
+.asm_f71
+	call DelayFrame
+	ld a, [$cf6c]
+	and a
+	jr nz, .asm_f71
+	ld a, c
+	ld hl, $ffd3
+	sub [hl]
+	ld c, a
+	jr .asm_f50
+; f82
+
+
+Get2bpp: ; f82
+	ld a, [rLCDC]
+	bit 7, a
+	jp nz, Request2bpp
+
+Copy2bpp: ; f89
+; copy c 2bpp tiles from b:de to hl
+
+	push hl
+	ld h, d
+	ld l, e
+	pop de
+
+; bank
+	ld a, b
+
+; bc = c * $10
+	push af
+	swap c
+	ld a, $f
+	and c
+	ld b, a
+	ld a, $f0
+	and c
+	ld c, a
+	pop af
+
+	jp FarCopyBytes
+; f9d
+
+
+Get1bpp: ; f9d
+	ld a, [rLCDC]
+	bit 7, a
+	jp nz, Request1bpp
+
+Copy1bpp: ; fa4
+; copy c 1bpp tiles from b:de to hl
+
+	push de
+	ld d, h
+	ld e, l
+
+; bank
+	ld a, b
+
+; bc = c * $10 / 2
+	push af
+	ld h, 0
+	ld l, c
+	add hl, hl
+	add hl, hl
+	add hl, hl
+	ld b, h
+	ld c, l
+	pop af
+
+	pop hl
+	jp FarCopyBytesDouble
+; fb6
+