mirror of https://github.com/pret/pokecrystal.git
104 lines
1.2 KiB
NASM
104 lines
1.2 KiB
NASM
ResetMapBufferEventFlags::
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xor a
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ld hl, wEventFlags
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ld [hli], a
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ret
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ResetBikeFlags::
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xor a
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ld hl, wBikeFlags
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ld [hli], a
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ld [hl], a
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ret
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ResetFlashIfOutOfCave::
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ld a, [wEnvironment]
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cp ROUTE
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jr z, .outdoors
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cp TOWN
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jr z, .outdoors
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ret
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.outdoors
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ld hl, wStatusFlags
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res STATUSFLAGS_FLASH_F, [hl]
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ret
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EventFlagAction::
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ld hl, wEventFlags
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call FlagAction
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ret
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FlagAction::
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; Perform action b on bit de in flag array hl.
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; inputs:
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; b: function
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; 0 RESET_FLAG clear bit
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; 1 SET_FLAG set bit
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; 2 CHECK_FLAG check bit
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; de: bit number
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; hl: pointer to the flag array
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; get index within the byte
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ld a, e
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and 7
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; shift de right by three bits (get the index within memory)
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rept 3
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srl d
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rr e
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endr
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add hl, de
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; implement a decoder
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ld c, 1
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rrca
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jr nc, .one
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rlc c
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.one
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rrca
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jr nc, .two
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rlc c
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rlc c
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.two
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rrca
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jr nc, .three
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swap c
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.three
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; check b's value: 0, 1, 2
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ld a, b
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cp SET_FLAG
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jr c, .clearbit ; RESET_FLAG
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jr z, .setbit ; SET_FLAG
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; check bit
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ld a, [hl]
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and c
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ld c, a
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ret
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.setbit
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; set bit
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ld a, [hl]
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or c
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ld [hl], a
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ret
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.clearbit
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; clear bit
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ld a, c
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cpl
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and [hl]
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ld [hl], a
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ret
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CheckReceivedDex::
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ld de, ENGINE_POKEDEX
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ld b, CHECK_FLAG
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farcall EngineFlagAction
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ld a, c
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and a
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ret
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