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; empties screen and replaces
; wVBlankFunctionTrampoline with HandleAllSpriteAnimations
SetSpriteAnimationsAsVBlankFunction:
call EmptyScreen
call Set_OBJ_8x8
call Func_3ca4
lb de, $38, $7f
call SetupText
ld hl, wVBlankFunctionTrampoline + 1
ld de, wVBlankFunctionTrampolineBackup
call BackupVBlankFunctionTrampoline
di
ld [hl], LOW(HandleAllSpriteAnimations)
inc hl
ld [hl], HIGH(HandleAllSpriteAnimations)
ei
ret
; sets backup VBlank function as wVBlankFunctionTrampoline
RestoreVBlankFunction:
ld hl, wVBlankFunctionTrampolineBackup
ld de, wVBlankFunctionTrampoline + 1
call BackupVBlankFunctionTrampoline
call Func_3ca4
bank1call ZeroObjectPositionsAndToggleOAMCopy
ret
; copies 2 bytes from hl to de while interrupts are disabled
; used to load or store wVBlankFunctionTrampoline
; to wVBlankFunctionTrampolineBackup
BackupVBlankFunctionTrampoline:
di
ld a, [hli]
ld [de], a
inc de
ld a, [hld]
ld [de], a
ei
ret
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