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VBlank::
push af
push bc
push de
push hl
ldh a, [rVBK] ; vram bank
push af
xor a
ldh [rVBK], a ; reset vram bank to 0
ldh a, [hLoadedROMBank]
ld [wVBlankSavedROMBank], a
ldh a, [hSCX]
ldh [rSCX], a
ldh a, [hSCY]
ldh [rSCY], a
ld a, [wDisableVBlankWYUpdate]
and a
jr nz, .ok
ldh a, [hWY]
ldh [rWY], a
.ok
call AutoBgMapTransfer
call VBlankCopyBgMap
call RedrawRowOrColumn
call VBlankCopy
call VBlankCopyDouble
call UpdateMovingBgTiles
call hDMARoutine
ld a, BANK(PrepareOAMData)
ldh [hLoadedROMBank], a
ld [MBC1RomBank], a
call PrepareOAMData
; VBlank-sensitive operations end.
call TrackPlayTime ; keep track of time played
call Random
call ReadJoypad
ldh a, [hVBlankOccurred]
and a
jr z, .skipZeroing
xor a
ldh [hVBlankOccurred], a
.skipZeroing
ldh a, [hFrameCounter]
and a
jr z, .skipDec
dec a
ldh [hFrameCounter], a
.skipDec
call FadeOutAudio
ld a, BANK(Music_DoLowHealthAlarm)
call BankswitchCommon
call Music_DoLowHealthAlarm
ld a, BANK(Audio1_UpdateMusic)
call BankswitchCommon
call Audio1_UpdateMusic
call SerialFunction
ld a, [wVBlankSavedROMBank]
ldh [hLoadedROMBank], a
ld [MBC1RomBank], a
pop af
ldh [rVBK], a
pop hl
pop de
pop bc
pop af
reti
DelayFrame::
; Wait for the next vblank interrupt.
; As a bonus, this saves battery.
NOT_VBLANKED EQU 1
ld a, NOT_VBLANKED
ldh [hVBlankOccurred], a
.halt
halt
ldh a, [hVBlankOccurred]
and a
jr nz, .halt
ret
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