ref: fcb573f4ac006b73827b6fc317fc7501e17004ae
dir: /home/vblank.asm/
VBlank:: push af push bc push de push hl 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 Random 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, [wAudioROMBank] ; music ROM bank ldh [hLoadedROMBank], 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 farcall TrackPlayTime ; keep track of time played ldh a, [hDisableJoypadPolling] and a call z, ReadJoypad ld a, [wVBlankSavedROMBank] ldh [hLoadedROMBank], 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 ldh [hVBlankOccurred], a .halt halt ldh a, [hVBlankOccurred] and a jr nz, .halt ret