ref: 6e46ec61f9a324116ef016397cdce9e67f75e77f
dir: /home/vblank.asm/
VBlank:: push af push bc push de push hl ld a, [H_LOADEDROMBANK] ld [wd122], 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 RedrawExposedScreenEdge call VBlankCopy call VBlankCopyDouble call UpdateMovingBgTiles call $ff80 ; hOAMDMA ld a, Bank(PrepareOAMData) ld [H_LOADEDROMBANK], a ld [MBC1RomBank], a call PrepareOAMData ; VBlank-sensitive operations end. call Random ld a, [H_VBLANKOCCURRED] and a jr z, .vblanked xor a ld [H_VBLANKOCCURRED], a .vblanked ld a, [H_FRAMECOUNTER] and a jr z, .decced dec a ld [H_FRAMECOUNTER], a .decced call Func_28cb ld a, [wc0ef] ; music ROM bank ld [H_LOADEDROMBANK], a ld [MBC1RomBank], a cp BANK(Music2_UpdateMusic) jr nz, .notbank2 .bank2 call Music2_UpdateMusic jr .afterMusic .notbank2 cp BANK(Music8_UpdateMusic) jr nz, .bank1F .bank8 call Music_DoLowHealthAlarm call Music8_UpdateMusic jr .afterMusic .bank1F call Music1f_UpdateMusic .afterMusic callba TrackPlayTime ; keep track of time played ld a, [$fff9] and a call z, ReadJoypad ld a, [wd122] 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