pokecrystal-board/home/vblank.asm

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; VBlank is the interrupt responsible for updating VRAM.
; In Pokemon Crystal, VBlank has been hijacked to act as the
; main loop. After time-sensitive graphics operations have been
; performed, joypad input and sound functions are executed.
; This prevents the display and audio output from lagging.
VBlank:: ; 283
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push af
push bc
push de
push hl
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ld a, [hVBlank]
and 7
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ld e, a
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ld d, 0
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ld hl, .VBlanks
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rept 2
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add hl, de
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endr
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ld a, [hli]
ld h, [hl]
ld l, a
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call _hl_
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call GameTimer
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pop hl
pop de
pop bc
pop af
reti
; 2a1
.VBlanks ; 2a1
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dw VBlank0
dw VBlank1
dw VBlank2
dw VBlank3
dw VBlank4
dw VBlank5
dw VBlank6
dw VBlank0 ; just in case
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; 2b1
VBlank0:: ; 2b1
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; normal operation
; rng
; scx, scy, wy, wx
; bg map buffer
; palettes
; dma transfer
; bg map
; tiles
; oam
; joypad
; sound
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; inc frame counter
ld hl, hVBlankCounter
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inc [hl]
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; advance random variables
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ld a, [rDIV]
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ld b, a
ld a, [hRandomAdd]
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adc b
ld [hRandomAdd], a
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ld a, [rDIV]
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ld b, a
ld a, [hRandomSub]
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sbc b
ld [hRandomSub], a
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ld a, [hROMBank]
ld [hROMBankBackup], a
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ld a, [hSCX]
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ld [rSCX], a
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ld a, [hSCY]
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ld [rSCY], a
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ld a, [hWY]
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ld [rWY], a
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ld a, [hWX]
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ld [rWX], a
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; There's only time to call one of these in one vblank.
; Calls are in order of priority.
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call UpdateBGMapBuffer
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jr c, .done
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call UpdatePalsIfCGB
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jr c, .done
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call DMATransfer
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jr c, .done
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call UpdateBGMap
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; These have their own timing checks.
call Serve2bppRequest
call Serve1bppRequest
call AnimateTileset
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.done
ld a, [hOAMUpdate]
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and a
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jr nz, .done_oam
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call hPushOAM
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.done_oam
; vblank-sensitive operations are done
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xor a
ld [VBlankOccurred], a
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ld a, [OverworldDelay]
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and a
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jr z, .ok
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dec a
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ld [OverworldDelay], a
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.ok
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ld a, [TextDelayFrames]
and a
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jr z, .ok2
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dec a
ld [TextDelayFrames], a
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.ok2
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call Joypad
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ld a, BANK(_UpdateSound)
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rst Bankswitch
call _UpdateSound
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ld a, [hROMBankBackup]
rst Bankswitch
ld a, [hSeconds]
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ld [hSecondsBackup], a
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ret
; 325
VBlank2:: ; 325
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; sound only
ld a, [hROMBank]
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ld [hROMBankBackup], a
ld a, BANK(_UpdateSound)
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rst Bankswitch
call _UpdateSound
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ld a, [hROMBankBackup]
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rst Bankswitch
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xor a
ld [VBlankOccurred], a
ret
; 337
VBlank1:: ; 337
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; scx, scy
; palettes
; bg map
; tiles
; oam
; sound / lcd stat
ld a, [hROMBank]
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ld [hROMBankBackup], a
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ld a, [hSCX]
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ld [rSCX], a
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ld a, [hSCY]
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ld [rSCY], a
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call UpdatePals
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jr c, .done
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call UpdateBGMap
call Serve2bppRequest@VBlank
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call hPushOAM
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.done
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xor a
ld [VBlankOccurred], a
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; get requested ints
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ld a, [rIF]
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ld b, a
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; discard requested ints
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xor a
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ld [rIF], a
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; enable lcd stat
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ld a, %10 ; lcd stat
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ld [rIE], a
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; rerequest serial int if applicable (still disabled)
; request lcd stat
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ld a, b
and %1000 ; serial
or %10 ; lcd stat
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ld [rIF], a
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ei
ld a, BANK(_UpdateSound)
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rst Bankswitch
call _UpdateSound
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ld a, [hROMBankBackup]
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rst Bankswitch
di
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; get requested ints
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ld a, [rIF]
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ld b, a
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; discard requested ints
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xor a
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ld [rIF], a
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; enable ints besides joypad
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ld a, %1111 ; serial timer lcdstat vblank
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ld [rIE], a
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; rerequest ints
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ld a, b
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ld [rIF], a
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ret
; 37f
UpdatePals:: ; 37f
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; update pals for either dmg or cgb
ld a, [hCGB]
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and a
jp nz, UpdateCGBPals
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; update gb pals
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ld a, [wcfc7]
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ld [rBGP], a
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ld a, [wcfc8]
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ld [rOBP0], a
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ld a, [wcfc9]
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ld [rOBP1], a
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and a
ret
; 396
VBlank3:: ; 396
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; scx, scy
; palettes
; bg map
; tiles
; oam
; sound / lcd stat
ld a, [hROMBank]
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ld [hROMBankBackup], a
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ld a, [hSCX]
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ld [rSCX], a
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ld a, [hSCY]
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ld [rSCY], a
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ld a, [hCGBPalUpdate]
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and a
call nz, ForceUpdateCGBPals
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jr c, .done
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call UpdateBGMap
call Serve2bppRequest@VBlank
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call hPushOAM
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.done
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xor a
ld [VBlankOccurred], a
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ld a, [rIF]
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push af
xor a
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ld [rIF], a
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ld a, %10 ; lcd stat
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ld [rIE], a
ld [rIF], a
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ei
ld a, BANK(_UpdateSound)
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rst Bankswitch
call _UpdateSound
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ld a, [hROMBankBackup]
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rst Bankswitch
di
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; request lcdstat
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ld a, [rIF]
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ld b, a
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; and any other ints
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pop af
or b
ld b, a
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; reset ints
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xor a
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ld [rIF], a
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; enable ints besides joypad
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ld a, %1111 ; serial timer lcdstat vblank
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ld [rIE], a
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; request ints
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ld a, b
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ld [rIF], a
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ret
; 3df
VBlank4:: ; 3df
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; bg map
; tiles
; oam
; joypad
; serial
; sound
ld a, [hROMBank]
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ld [hROMBankBackup], a
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call UpdateBGMap
call Serve2bppRequest
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call hPushOAM
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call Joypad
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xor a
ld [VBlankOccurred], a
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call AskSerial
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ld a, BANK(_UpdateSound)
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rst Bankswitch
call _UpdateSound
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ld a, [hROMBankBackup]
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rst Bankswitch
ret
; 400
VBlank5:: ; 400
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; scx
; palettes
; bg map
; tiles
; joypad
;
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ld a, [hROMBank]
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ld [hROMBankBackup], a
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ld a, [hSCX]
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ld [rSCX], a
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call UpdatePalsIfCGB
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jr c, .done
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call UpdateBGMap
call Serve2bppRequest
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.done
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xor a
ld [VBlankOccurred], a
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call Joypad
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xor a
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ld [rIF], a
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ld a, %10 ; lcd stat
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ld [rIE], a
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; request lcd stat
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ld [rIF], a
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ei
ld a, BANK(_UpdateSound)
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rst Bankswitch
call _UpdateSound
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ld a, [hROMBankBackup]
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rst Bankswitch
di
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xor a
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ld [rIF], a
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; enable ints besides joypad
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ld a, %1111 ; serial timer lcdstat vblank
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ld [rIE], a
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ret
; 436
VBlank6:: ; 436
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; palettes
; tiles
; dma transfer
; sound
ld a, [hROMBank]
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ld [hROMBankBackup], a
; inc frame counter
ld hl, hVBlankCounter
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inc [hl]
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call UpdateCGBPals
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jr c, .done
call Serve2bppRequest
call Serve1bppRequest
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call DMATransfer
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.done
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xor a
ld [VBlankOccurred], a
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ld a, BANK(_UpdateSound)
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rst Bankswitch
call _UpdateSound
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ld a, [hROMBankBackup]
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rst Bankswitch
ret
; 45a