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VBlank:: ; 1de5 (0:1de5)
push af
push bc
push de
push hl
ld a, [rVBK] ; vram bank
push af
xor a
ld [rVBK], a ; reset vram bank to 0
ld a, [H_LOADEDROMBANK]
ld [wVBlankSavedROMBank], a
ld a, [hSCX]
ld [rSCX], a
ld a, [hSCY]
ld [rSCY], a
ld a, [wDisableVBlankWYUpdate]
and a
jr nz, .ok
ld a, [hWY]
ld [rWY], a
.ok
call AutoBgMapTransfer
call VBlankCopyBgMap
call RedrawRowOrColumn
call VBlankCopy
call VBlankCopyDouble
call UpdateMovingBgTiles
call $ff80 ; hOAMDMA
ld a, BANK(PrepareOAMData)
ld [H_LOADEDROMBANK], a
ld [MBC1RomBank], a
call PrepareOAMData
; VBlank-sensitive operations end.
call TrackPlayTime ; keep track of time played
call Random
call ReadJoypad
ld a, [H_VBLANKOCCURRED]
and a
jr z, .skipZeroing
xor a
ld [H_VBLANKOCCURRED], a
.skipZeroing
ld a, [H_FRAMECOUNTER]
and a
jr z, .skipDec
dec a
ld [H_FRAMECOUNTER], a
.skipDec
call FadeOutAudio
callbs Music_DoLowHealthAlarm
callbs Audio1_UpdateMusic
call SerialFunction
ld a, [wVBlankSavedROMBank]
ld [H_LOADEDROMBANK], a
ld [MBC1RomBank], a
pop af
ld [rVBK],a
pop hl
pop de
pop bc
pop af
reti
DelayFrame:: ; 1e64 (0:1e64)
; Wait for the next vblank interrupt.
; As a bonus, this saves battery.
NOT_VBLANKED EQU 1
ld a, NOT_VBLANKED
ld [H_VBLANKOCCURRED], a
.halt
halt
ld a, [H_VBLANKOCCURRED]
and a
jr nz, .halt
ret
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