ref: 7ab43f4d17aa63d4ef1050d80560379f19200088
dir: /home/vblank.asm/
VBlank:: push af push bc push de push hl ld a, [hLoadedROMBank] 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 hDMARoutine ld a, BANK(PrepareOAMData) ld [hLoadedROMBank], a ld [MBC1RomBank], a call PrepareOAMData ; VBlank-sensitive operations end. call Random ld a, [hVBlankOccurred] and a jr z, .skipZeroing xor a ld [hVBlankOccurred], a .skipZeroing ld a, [hFrameCounter] and a jr z, .skipDec dec a ld [hFrameCounter], a .skipDec call FadeOutAudio ld a, [wAudioROMBank] ; music ROM bank ld [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 callba TrackPlayTime ; keep track of time played ld a, [hDisableJoypadPolling] and a call z, ReadJoypad ld a, [wVBlankSavedROMBank] ld [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 ld [hVBlankOccurred], a .halt halt ld a, [hVBlankOccurred] and a jr nz, .halt ret