106 lines
1.5 KiB
NASM
106 lines
1.5 KiB
NASM
VBlank::
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push af
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push bc
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push de
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push hl
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ld a, [H_LOADEDROMBANK]
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ld [wVBlankSavedROMBank], a
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ld a, [hSCX]
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ld [rSCX], a
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ld a, [hSCY]
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ld [rSCY], a
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ld a, [wDisableVBlankWYUpdate]
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and a
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jr nz, .ok
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ld a, [hWY]
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ld [rWY], a
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.ok
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call AutoBgMapTransfer
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call VBlankCopyBgMap
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call RedrawRowOrColumn
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call VBlankCopy
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call VBlankCopyDouble
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call UpdateMovingBgTiles
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call $ff80 ; hOAMDMA
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ld a, BANK(PrepareOAMData)
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ld [H_LOADEDROMBANK], a
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ld [MBC1RomBank], a
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call PrepareOAMData
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; VBlank-sensitive operations end.
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call Random
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ld a, [H_VBLANKOCCURRED]
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and a
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jr z, .skipZeroing
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xor a
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ld [H_VBLANKOCCURRED], a
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.skipZeroing
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ld a, [H_FRAMECOUNTER]
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and a
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jr z, .skipDec
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dec a
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ld [H_FRAMECOUNTER], a
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.skipDec
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call FadeOutAudio
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ld a, [wAudioROMBank] ; music ROM bank
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ld [H_LOADEDROMBANK], a
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ld [MBC1RomBank], a
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cp BANK(Audio1_UpdateMusic)
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jr nz, .checkForAudio2
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.audio1
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call Audio1_UpdateMusic
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jr .afterMusic
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.checkForAudio2
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cp BANK(Audio2_UpdateMusic)
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jr nz, .audio3
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.audio2
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call Music_DoLowHealthAlarm
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call Audio2_UpdateMusic
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jr .afterMusic
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.audio3
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call Audio3_UpdateMusic
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.afterMusic
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callba TrackPlayTime ; keep track of time played
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ld a, [hDisableJoypadPolling]
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and a
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call z, ReadJoypad
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ld a, [wVBlankSavedROMBank]
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ld [H_LOADEDROMBANK], a
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ld [MBC1RomBank], a
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pop hl
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pop de
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pop bc
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pop af
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reti
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DelayFrame::
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; Wait for the next vblank interrupt.
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; As a bonus, this saves battery.
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NOT_VBLANKED EQU 1
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ld a, NOT_VBLANKED
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ld [H_VBLANKOCCURRED], a
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.halt
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halt
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ld a, [H_VBLANKOCCURRED]
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and a
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jr nz, .halt
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ret
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