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129 lines
1.8 KiB
NASM
129 lines
1.8 KiB
NASM
INCLUDE "constants.asm"
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SECTION "home/movement.asm", ROM0
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InitMovementBuffer::
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ld [wMovementBufferObject], a
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xor a
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ld [wMovementBufferCount], a
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ld a, BANK(wMovementBuffer)
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ld [wMovementBufferPointerBank], a
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ld a, LOW(wMovementBuffer)
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ld [wMovementBufferPointerAddr], a
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ld a, HIGH(wMovementBuffer)
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ld [wMovementBufferPointerAddr + 1], a
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ret
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DecrementMovementBufferCount::
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ld a, [wMovementBufferCount]
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and a
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ret z
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dec a
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ld [wMovementBufferCount], a
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ret
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AppendToMovementBuffer:: ; 00:19f2
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push hl
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push de
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ld hl, wMovementBufferCount
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ld e, [hl]
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inc [hl]
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ld d, $0
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ld hl, wMovementBuffer
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add hl, de
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ld [hl], a
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pop de
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pop hl
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ret
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AppendToMovementBufferNTimes:: ; 00:1a03
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push af
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ld a, c
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and a
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jr nz, .asm_1a0a
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pop af
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ret
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.asm_1a0a: ; 00:1a0a
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pop af
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.asm_1a0b: ; 00:1a0b
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call AppendToMovementBuffer
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dec c
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jr nz, .asm_1a0b
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ret
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ComputePathToWalkToPlayer::
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push af
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ld a, b
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sub d
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ld h, LEFT
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jr nc, .asm_1a1d
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dec a
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cpl
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ld h, RIGHT
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.asm_1a1d: ; 00:1a1d
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ld d, a
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ld a, c
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sub e
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ld l, UP
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jr nc, .asm_1a28
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dec a
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cpl
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ld l, DOWN
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.asm_1a28: ; 00:1a28
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ld e, a
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cp d
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jr nc, .asm_1a32
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ld a, h
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ld h, l
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ld l, a
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ld a, d
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ld d, e
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ld e, a
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.asm_1a32: ; 00:1a32
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pop af
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ld b, a
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ld a, h
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call .GetMovementData
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ld c, d
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call AppendToMovementBufferNTimes
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ld a, l
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call .GetMovementData
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ld c, e
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call AppendToMovementBufferNTimes
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ret
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.GetMovementData: ; 00:1a45
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push de
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push hl
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ld l, b
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ld h, $0
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add hl, hl
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add hl, hl
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ld e, a
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ld d, $0
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add hl, de
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ld de, .Data
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add hl, de
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ld a, [hl]
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pop hl
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pop de
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ret
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.Data: ; 00:1a58
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db $04, $05, $06, $07
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db $08, $09, $0a, $0b
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db $0c, $0d, $0e, $0f
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; slow_step DOWN
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; slow_step UP
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; slow_step LEFT
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; slow_step RIGHT
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; step DOWN
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; step UP
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; step LEFT
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; step RIGHT
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; big_step DOWN
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; big_step UP
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; big_step LEFT
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; big_step RIGHT |