mirror of https://github.com/pret/pokecrystal.git
271 lines
3.7 KiB
NASM
271 lines
3.7 KiB
NASM
_HandlePlayerStep::
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ld a, [wPlayerStepFlags]
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and a
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ret z
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bit 7, a ; starting step
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jr nz, .update_overworld_map
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bit 6, a ; finishing step
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jr nz, .update_player_coords
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bit 5, a ; ongoing step
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jr nz, .finish
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ret
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.update_overworld_map
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ld a, 4
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ld [wHandlePlayerStep], a
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call UpdateOverworldMap
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jr .finish
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.update_player_coords
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call UpdatePlayerCoords
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jr .finish
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.finish
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call HandlePlayerStep
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ld a, [wPlayerStepVectorX]
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ld d, a
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ld a, [wPlayerStepVectorY]
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ld e, a
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ld a, [wPlayerBGMapOffsetX]
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sub d
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ld [wPlayerBGMapOffsetX], a
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ld a, [wPlayerBGMapOffsetY]
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sub e
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ld [wPlayerBGMapOffsetY], a
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ret
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ScrollScreen::
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ld a, [wPlayerStepVectorX]
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ld d, a
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ld a, [wPlayerStepVectorY]
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ld e, a
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ldh a, [hSCX]
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add d
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ldh [hSCX], a
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ldh a, [hSCY]
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add e
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ldh [hSCY], a
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ret
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HandlePlayerStep:
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ld hl, wHandlePlayerStep
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ld a, [hl]
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and a
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ret z
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dec [hl]
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ld a, [hl]
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ld hl, .Jumptable
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rst JumpTable
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ret
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.Jumptable:
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dw GetMovementPermissions
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dw BufferScreen
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dw .mobile
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dw .fail2
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; The rest are never used. Ever.
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dw .fail1
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dw .fail1
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dw .fail1
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dw .fail1
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dw .fail1
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dw .fail1
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dw .fail1
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.fail1
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ret
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.mobile
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farcall StubbedTrainerRankings_StepCount
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ret
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.fail2
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ret
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UpdatePlayerCoords:
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ld a, [wPlayerStepDirection]
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and a
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jr nz, .check_step_down
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ld hl, wYCoord
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inc [hl]
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ret
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.check_step_down
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cp UP
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jr nz, .check_step_left
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ld hl, wYCoord
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dec [hl]
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ret
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.check_step_left
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cp LEFT
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jr nz, .check_step_right
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ld hl, wXCoord
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dec [hl]
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ret
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.check_step_right
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cp RIGHT
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ret nz
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ld hl, wXCoord
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inc [hl]
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ret
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UpdateOverworldMap:
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ld a, [wPlayerStepDirection]
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and a
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jr z, .step_down
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cp UP
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jr z, .step_up
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cp LEFT
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jr z, .step_left
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cp RIGHT
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jr z, .step_right
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ret
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.step_down
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call .ScrollOverworldMapDown
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call LoadMapPart
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call ScrollMapUp
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ret
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.step_up
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call .ScrollOverworldMapUp
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call LoadMapPart
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call ScrollMapDown
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ret
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.step_left
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call .ScrollOverworldMapLeft
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call LoadMapPart
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call ScrollMapRight
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ret
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.step_right
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call .ScrollOverworldMapRight
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call LoadMapPart
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call ScrollMapLeft
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ret
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.ScrollOverworldMapDown:
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ld a, [wBGMapAnchor]
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add 2 * BG_MAP_WIDTH
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ld [wBGMapAnchor], a
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jr nc, .not_overflowed
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ld a, [wBGMapAnchor + 1]
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inc a
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and %11
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or HIGH(vBGMap0)
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ld [wBGMapAnchor + 1], a
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.not_overflowed
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ld hl, wMetatileStandingY
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inc [hl]
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ld a, [hl]
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cp 2 ; was 1
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jr nz, .done_down
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ld [hl], 0
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call .Add6ToOverworldMapAnchor
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.done_down
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ret
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.Add6ToOverworldMapAnchor:
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ld hl, wOverworldMapAnchor
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ld a, [wMapWidth]
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add 6
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add [hl]
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ld [hli], a
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ret nc
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inc [hl]
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ret
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.ScrollOverworldMapUp:
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ld a, [wBGMapAnchor]
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sub 2 * BG_MAP_WIDTH
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ld [wBGMapAnchor], a
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jr nc, .not_underflowed
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ld a, [wBGMapAnchor + 1]
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dec a
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and %11
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or HIGH(vBGMap0)
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ld [wBGMapAnchor + 1], a
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.not_underflowed
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ld hl, wMetatileStandingY
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dec [hl]
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ld a, [hl]
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cp -1 ; was 0
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jr nz, .done_up
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ld [hl], $1
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call .Sub6FromOverworldMapAnchor
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.done_up
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ret
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.Sub6FromOverworldMapAnchor:
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ld hl, wOverworldMapAnchor
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ld a, [wMapWidth]
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add 6
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ld b, a
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ld a, [hl]
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sub b
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ld [hli], a
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ret nc
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dec [hl]
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ret
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.ScrollOverworldMapLeft:
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ld a, [wBGMapAnchor]
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ld e, a
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and $e0
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ld d, a
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ld a, e
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sub $2
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and $1f
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or d
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ld [wBGMapAnchor], a
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ld hl, wMetatileStandingX
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dec [hl]
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ld a, [hl]
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cp -1
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jr nz, .done_left
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ld [hl], 1
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call .DecrementwOverworldMapAnchor
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.done_left
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ret
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.DecrementwOverworldMapAnchor:
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ld hl, wOverworldMapAnchor
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ld a, [hl]
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sub 1
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ld [hli], a
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ret nc
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dec [hl]
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ret
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.ScrollOverworldMapRight:
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ld a, [wBGMapAnchor]
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ld e, a
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and $e0
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ld d, a
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ld a, e
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add $2
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and $1f
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or d
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ld [wBGMapAnchor], a
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ld hl, wMetatileStandingX
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inc [hl]
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ld a, [hl]
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cp 2
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jr nz, .done_right
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ld [hl], 0
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call .IncrementwOverworldMapAnchor
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.done_right
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ret
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.IncrementwOverworldMapAnchor:
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ld hl, wOverworldMapAnchor
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ld a, [hl]
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add 1
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ld [hli], a
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ret nc
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inc [hl]
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ret
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