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|
VBlank::
push af
push bc
push de
push hl
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 Random
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
ld a, [wAudioROMBank] ; music ROM bank
ld [H_LOADEDROMBANK], a
ld [MBC1RomBank], a
cp BANK(Audio1_UpdateMusic)
jr nz, .checkForAudio2
.audio1
call Audio1_UpdateMusic
jr .afterMusic
.checkForAudio2
cp BANK(Audio2_UpdateMusic)
jr nz, .audio3
.audio2
call Music_DoLowHealthAlarm
call Audio2_UpdateMusic
jr .afterMusic
.audio3
call Audio3_UpdateMusic
.afterMusic
callba TrackPlayTime ; keep track of time played
ld a, [hDisableJoypadPolling]
and a
call z, ReadJoypad
ld a, [wVBlankSavedROMBank]
ld [H_LOADEDROMBANK], a
ld [MBC1RomBank], 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
ld [H_VBLANKOCCURRED], a
.halt
halt
ld a, [H_VBLANKOCCURRED]
and a
jr nz, .halt
ret
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