ref: 84c7985e67b0838fce04e49a0916aa5a873131b3
dir: /home/vblank.asm/
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