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dannye
75 lines
1.1 KiB
NASM
75 lines
1.1 KiB
NASM
FarCopyData::
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; Copy bc bytes from a:hl to de.
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ld [wFarCopyDataSavedROMBank], a
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ldh a, [hLoadedROMBank]
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push af
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ld a, [wFarCopyDataSavedROMBank]
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call BankswitchCommon
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call CopyData
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pop af
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call BankswitchCommon
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ret
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CopyData::
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; Copy bc bytes from hl to de.
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ld a, b
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and a
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jr z, .copybytes
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ld a, c
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and a ; is lower byte 0
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jr z, .loop
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inc b ; if not, increment b as there are <$100 bytes to copy
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.loop
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call .copybytes
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dec b
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jr nz, .loop
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ret
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.copybytes
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ld a, [hli]
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ld [de], a
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inc de
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dec c
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jr nz, .copybytes
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ret
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CopyVideoDataAlternate::
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ldh a, [rLCDC]
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bit B_LCDC_ENABLE, a ; LCD enabled?
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jp nz, CopyVideoData ; if yes, then copy video data
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push hl
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ld h, d
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ld l, e
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pop de
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ld a, b ; save bank
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push af
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swap c
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ld a, $f
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and c
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ld b, a
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ld a, $f0
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and c
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ld c, a
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pop af
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jp FarCopyData
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CopyVideoDataDoubleAlternate::
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ldh a, [rLCDC]
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bit B_LCDC_ENABLE, a ; LCD enabled?
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jp nz, CopyVideoDataDouble ; if yes, then copy video data
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push de
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ld d, h
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ld e, l
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ld a, b
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push af ; save bank to switch to
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ld h, $0
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ld l, c
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add hl, hl ; get raw length of bytes to copy
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add hl, hl
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add hl, hl
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ld b, h
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ld c, l
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pop af
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pop hl
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jp FarCopyDataDouble
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