516 lines
14 KiB
NASM
516 lines
14 KiB
NASM
INCLUDE "hardware.inc"
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INCLUDE "sprobjs_lib.asm"
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SECTION "Header", ROM0[$100]
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jp Init
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ds $150 - @, 0 ; Make room for the header
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SECTION "Main", ROM0
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Init:
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; Shut down audio circuitry
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ld a, 0
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ld [rNR52], a
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; Do not turn the LCD off outside of VBlank
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WaitVBlank:
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ld a, [rLY]
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cp 144
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jp c, WaitVBlank
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; Turn the LCD off
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ld a, 0
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ld [rLCDC], a
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; Initialize Sprite Object Library
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call InitSprObjLib
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; Reset hardware OAM
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xor a, a
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ld b, 160
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ld hl, _OAMRAM
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.resetOAM
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ld [hli], a
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dec b
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jr nz, .resetOAM
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; Copy cat sprite
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ld de, GfxCat
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ld hl, $8000
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ld bc, GfxCat.end - GfxCat
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call Memcopy
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; Reset positions
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ld hl, wMetaspritePosition.x
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ld a, $10
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ld [wMetaspritePosition.x], a
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ld a, $0
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ld [wMetaspritePosition.x + 1], a
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ld hl, wMetaspritePosition.y
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ld a, $10
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ld [wMetaspritePosition.y], a
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ld a, $01
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ld [wMetaspritePosition.y + 1], a
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ld hl, wMetaspritePosition.z
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ld a, $00
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ld [wMetaspritePosition.z], a
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ld a, $0
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ld [wMetaspritePosition.z + 1], a
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; Reset velocity
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ld hl, wMetaspriteVelocity.x
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ld a, $0
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ld [wMetaspriteVelocity.x], a
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ld a, $0
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ld [wMetaspriteVelocity.x + 1], a
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ld hl, wMetaspriteVelocity.y
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ld a, $0
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ld [wMetaspriteVelocity.y], a
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ld a, $0
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ld [wMetaspriteVelocity.y + 1], a
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ld hl, wMetaspriteVelocity.z
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ld a, $0
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ld [wMetaspriteVelocity.z], a
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ld a, $0
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ld [wMetaspriteVelocity.z + 1], a
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; Copy the tile data
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ld de, Tiles
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ld hl, $9000
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ld bc, TilesEnd - Tiles
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call Memcopy
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; Copy the tilemap
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ld de, Tilemap
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ld hl, $9800
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ld bc, TilemapEnd - Tilemap
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call Memcopy
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; Turn the LCD on
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ld a, LCDCF_ON | LCDCF_BGON | LCDCF_OBJON | LCDCF_OBJ8
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ld [rLCDC], a
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; During the first (blank) frame, initialize display registers
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ld a, %11100100
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ld [rBGP], a
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ld [rOBP0], a
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ld [rOBP1], a
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; Enable vblank interrupt
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ld a, IEF_VBLANK
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ldh [rIE], a
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; Clear interrupt register to 0
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xor a, a
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ldh [rIF], a
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; Enable interrupts
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ei
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Main::
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call ResetShadowOAM
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call UpdateJoypadState
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call HandleInput
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call HandlePhysics
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call HandleRender
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halt
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nop
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jp Main
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HandleInput::
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ld a, [wJoypadState]
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bit PADB_LEFT, a
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jr nz, .leftend
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ld a, [wMetaspritePosition.x]
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add a, 16
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ld b, a
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ld [wMetaspritePosition.x], a
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ld a, [wMetaspritePosition.x+1]
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adc 0
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ld c, a
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ld [wMetaspritePosition.x+1], a
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.leftend:
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ld a, [wJoypadState]
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bit PADB_RIGHT, a
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jr nz, .rightend
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ld a, [wMetaspritePosition.x]
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sub a, 16
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ld b, a
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ld [wMetaspritePosition.x], a
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ld a, [wMetaspritePosition.x+1]
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sbc 0
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ld c, a
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ld [wMetaspritePosition.x+1], a
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.rightend:
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ld a, [wJoypadState]
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bit PADB_UP, a
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jr nz, .upend
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ld a, [wMetaspritePosition.y]
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add a, 16
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ld b, a
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ld [wMetaspritePosition.y], a
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ld a, [wMetaspritePosition.y+1]
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adc 0
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ld c, a
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ld [wMetaspritePosition.y+1], a
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.upend:
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ld a, [wJoypadState]
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bit PADB_DOWN, a
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jr nz, .downend
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ld a, [wMetaspritePosition.y]
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sub a, 16
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ld b, a
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ld [wMetaspritePosition.y], a
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ld a, [wMetaspritePosition.y+1]
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sbc 0
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ld c, a
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ld [wMetaspritePosition.y+1], a
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.downend:
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ld a, [wJoypadPressed]
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bit PADB_A, a
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jr z, .jumpend
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ld a, [wMetaspriteVelocity.z]
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sub a, $F0
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ld b, a
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ld [wMetaspriteVelocity.z], a
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ld a, [wMetaspriteVelocity.z+1]
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sbc a, $00
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ld c, a
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ld [wMetaspriteVelocity.z+1], a
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.jumpend:
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ret
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HandleRender::
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; Render the player
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; load de
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ld a, [wMetaspritePosition.x]
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ld e, a
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ld a, [wMetaspritePosition.x + 1]
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ld d, a
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; load bc
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ld a, [wMetaspritePosition.z]
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ld c, a
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ld a, [wMetaspritePosition.y]
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add a, c
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ld c, a
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ld a, [wMetaspritePosition.z + 1]
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ld b, a
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ld a, [wMetaspritePosition.y + 1]
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adc a, b
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ld b, a
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ld hl, CatMetasprite
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call RenderMetasprite
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; Render the shadow
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; load de
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ld a, [wMetaspritePosition.x]
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ld e, a
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ld a, [wMetaspritePosition.x + 1]
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ld d, a
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; load bc
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ld a, [wMetaspritePosition.y]
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ld c, a
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ld a, [wMetaspritePosition.y + 1]
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ld b, a
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ld hl, ShadowMetasprite
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call RenderMetasprite
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ret
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HandlePhysics::
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; Skip gravity if on ground
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ld a, [wMetaspritePosition.z]
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ld b, a
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ld a, [wMetaspritePosition.z + 1]
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or a, b
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cp 0
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jr z, .endGravity
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; Apply gravity
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ld a, [wMetaspriteVelocity.z]
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add a, $02
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ld [wMetaspriteVelocity.z], a
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ld a, [wMetaspriteVelocity.z+1]
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adc a, $00
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ld [wMetaspriteVelocity.z+1], a
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.endGravity:
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; Calculate new z, place in bc
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ld a, [wMetaspriteVelocity.z]
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ld c, a
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ld a, [wMetaspritePosition.z]
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add c
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ld a, [wMetaspriteVelocity.z + 1]
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ld b, a
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ld a, [wMetaspritePosition.z + 1]
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adc b
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; If z is greater than or equal to 0, pos/vel to 0
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jr nz, .endLanding1
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jr nc, .endLanding1
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.startLanding
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ld a, 0
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ld [wMetaspriteVelocity.z], a
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ld [wMetaspriteVelocity.z+1], a
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ld c, 0
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ld b, 0
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jr .endLanding
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.endLanding1
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nop
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.endLanding
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; Update z position
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ld a, c
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ld [wMetaspritePosition.z], a
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ld a, b
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ld [wMetaspritePosition.z+1], a
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ret
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SECTION "Joypad Routine", ROM0
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UpdateJoypadState::
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ld hl, rP1
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ld [hl], P1F_GET_BTN
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; Read button state twice to ensure we get the proper state
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ld a, [hl]
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ld a, [hl]
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ld [hl], P1F_GET_DPAD
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cpl ; Inputs are active low - invert so it makes more sense
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and PADF_A | PADF_B | PADF_SELECT | PADF_START
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ld c, a ; Store lower 4 button bits in c
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; On real hardware, rP1 needs to be read 8 times to ensure proper state is read
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ld b, 8
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.dpadDebounceLoop:
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ld a, [hl]
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dec b
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jr nz, .dpadDebounceLoop
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ld [hl], P1F_GET_NONE ; Disable joypad inputs
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swap a ; Swap the nibbles to store dpad in upper 4 bits
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cpl ; invert the bits
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and PADF_RIGHT | PADF_LEFT | PADF_UP | PADF_DOWN
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or c
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ld c, a
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; Compare with previously stored state
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ld hl, wJoypadState
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xor [hl]
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and c
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ld [wJoypadPressed], a
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ld a, c
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ld [wJoypadState], a
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ret
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SECTION "MemCopy Routine", ROM0
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Memcopy::
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dec bc
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inc b
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inc c
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.loop:
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ld a, [de]
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ld [hli], a
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inc de
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dec c
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jr nz, .loop
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dec b
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jr nz, .loop
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ret
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SECTION "VBlank Interrupt", ROM0[$0040]
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VBlankInterrupt:
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; Store registers to prevent clobbering
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push af
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push bc
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push de
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push hl
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jp VBlankHandler
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SECTION "VBlank Handler", ROM0
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VBlankHandler:
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ldh a, [hFrameCounter]
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/*
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bit 5, a
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ld a, %11100100
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jr z, .skipCpl
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cpl ; Invert a
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.skipCpl:
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ldh [rBGP], a
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*/
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ld a, HIGH(wShadowOAM)
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call hOAMDMA
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; Reset registers to orignal state
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pop hl
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pop de
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pop bc
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pop af
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reti
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SECTION "Frame Counter", HRAM
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hFrameCounter:
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db
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SECTION "Tile data", ROM0
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Tiles:
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db $00,$ff, $00,$ff, $00,$ff, $00,$ff, $00,$ff, $00,$ff, $00,$ff, $00,$ff
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db $00,$ff, $00,$80, $00,$80, $00,$80, $00,$80, $00,$80, $00,$80, $00,$80
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db $00,$ff, $00,$7e, $00,$7e, $00,$7e, $00,$7e, $00,$7e, $00,$7e, $00,$7e
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db $00,$ff, $00,$01, $00,$01, $00,$01, $00,$01, $00,$01, $00,$01, $00,$01
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db $00,$ff, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00
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db $00,$ff, $00,$7f, $00,$7f, $00,$7f, $00,$7f, $00,$7f, $00,$7f, $00,$7f
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db $00,$ff, $03,$fc, $00,$f8, $00,$f0, $00,$e0, $20,$c0, $00,$c0, $40,$80
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db $00,$ff, $c0,$3f, $00,$1f, $00,$0f, $00,$07, $04,$03, $00,$03, $02,$01
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db $00,$80, $00,$80, $7f,$80, $00,$80, $00,$80, $7f,$80, $7f,$80, $00,$80
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db $00,$7e, $2a,$7e, $d5,$7e, $2a,$7e, $54,$7e, $ff,$00, $ff,$00, $00,$00
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db $00,$01, $00,$01, $ff,$01, $00,$01, $01,$01, $fe,$01, $ff,$01, $00,$01
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db $00,$80, $80,$80, $7f,$80, $80,$80, $00,$80, $ff,$80, $7f,$80, $80,$80
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db $00,$7f, $2a,$7f, $d5,$7f, $2a,$7f, $55,$7f, $ff,$00, $ff,$00, $00,$00
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db $00,$ff, $aa,$ff, $55,$ff, $aa,$ff, $55,$ff, $fa,$07, $fd,$07, $02,$07
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db $00,$7f, $2a,$7f, $d5,$7f, $2a,$7f, $55,$7f, $aa,$7f, $d5,$7f, $2a,$7f
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db $00,$ff, $80,$ff, $00,$ff, $80,$ff, $00,$ff, $80,$ff, $00,$ff, $80,$ff
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db $40,$80, $00,$80, $7f,$80, $00,$80, $00,$80, $7f,$80, $7f,$80, $00,$80
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db $00,$3c, $02,$7e, $85,$7e, $0a,$7e, $14,$7e, $ab,$7e, $95,$7e, $2a,$7e
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db $02,$01, $00,$01, $ff,$01, $00,$01, $01,$01, $fe,$01, $ff,$01, $00,$01
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db $00,$ff, $80,$ff, $50,$ff, $a8,$ff, $50,$ff, $a8,$ff, $54,$ff, $a8,$ff
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db $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80
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db $ff,$00, $ff,$00, $ff,$00, $ab,$7e, $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7e
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db $ff,$01, $fe,$01, $ff,$01, $fe,$01, $ff,$01, $fe,$01, $ff,$01, $fe,$01
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db $7f,$80, $ff,$80, $7f,$80, $ff,$80, $7f,$80, $ff,$80, $7f,$80, $ff,$80
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db $ff,$00, $ff,$00, $ff,$00, $aa,$7f, $d5,$7f, $aa,$7f, $d5,$7f, $aa,$7f
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db $f8,$07, $f8,$07, $f8,$07, $80,$ff, $00,$ff, $aa,$ff, $55,$ff, $aa,$ff
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db $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $ff,$80, $7f,$80, $ff,$80
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db $d5,$7f, $aa,$7f, $d5,$7f, $aa,$7f, $d5,$7f, $aa,$7f, $d5,$7f, $aa,$7f
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db $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7e, $d5,$7e, $eb,$3c
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db $54,$ff, $aa,$ff, $54,$ff, $aa,$ff, $54,$ff, $aa,$ff, $54,$ff, $aa,$ff
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db $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $00,$ff
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db $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7e, $d5,$7e, $2a,$ff
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db $ff,$01, $fe,$01, $ff,$01, $fe,$01, $ff,$01, $fe,$01, $ff,$01, $80,$ff
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db $7f,$80, $ff,$80, $7f,$80, $ff,$80, $7f,$80, $ff,$80, $7f,$80, $aa,$ff
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db $ff,$00, $ff,$00, $ff,$00, $ff,$00, $ff,$00, $ff,$00, $ff,$00, $2a,$ff
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db $ff,$01, $fe,$01, $ff,$01, $fe,$01, $fe,$01, $fe,$01, $fe,$01, $80,$ff
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db $7f,$80, $ff,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $7f,$80, $00,$ff
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db $fe,$01, $fe,$01, $fe,$01, $fe,$01, $fe,$01, $fe,$01, $fe,$01, $80,$ff
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db $3f,$c0, $3f,$c0, $3f,$c0, $1f,$e0, $1f,$e0, $0f,$f0, $03,$fc, $00,$ff
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db $fd,$03, $fc,$03, $fd,$03, $f8,$07, $f9,$07, $f0,$0f, $c1,$3f, $82,$ff
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db $55,$ff, $2a,$7e, $54,$7e, $2a,$7e, $54,$7e, $2a,$7e, $54,$7e, $00,$7e
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db $01,$ff, $00,$01, $01,$01, $00,$01, $01,$01, $00,$01, $01,$01, $00,$01
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db $54,$ff, $ae,$f8, $50,$f0, $a0,$e0, $60,$c0, $80,$c0, $40,$80, $40,$80
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db $55,$ff, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00
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db $55,$ff, $6a,$1f, $05,$0f, $02,$07, $05,$07, $02,$03, $03,$01, $02,$01
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db $54,$ff, $80,$80, $00,$80, $80,$80, $00,$80, $80,$80, $00,$80, $00,$80
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db $55,$ff, $2a,$1f, $0d,$07, $06,$03, $01,$03, $02,$01, $01,$01, $00,$01
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db $55,$ff, $2a,$7f, $55,$7f, $2a,$7f, $55,$7f, $2a,$7f, $55,$7f, $00,$7f
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db $55,$ff, $aa,$ff, $55,$ff, $aa,$ff, $55,$ff, $aa,$ff, $55,$ff, $00,$ff
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db $15,$ff, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00, $00,$00
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db $55,$ff, $6a,$1f, $0d,$07, $06,$03, $01,$03, $02,$01, $03,$01, $00,$01
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db $54,$ff, $a8,$ff, $54,$ff, $a8,$ff, $50,$ff, $a0,$ff, $40,$ff, $00,$ff
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db $00,$7e, $2a,$7e, $d5,$7e, $2a,$7e, $54,$7e, $ab,$76, $dd,$66, $22,$66
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db $00,$7c, $2a,$7e, $d5,$7e, $2a,$7e, $54,$7c, $ff,$00, $ff,$00, $00,$00
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db $00,$01, $00,$01, $ff,$01, $02,$01, $07,$01, $fe,$03, $fd,$07, $0a,$0f
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db $00,$7c, $2a,$7e, $d5,$7e, $2a,$7e, $54,$7e, $ab,$7e, $d5,$7e, $2a,$7e
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db $00,$ff, $a0,$ff, $50,$ff, $a8,$ff, $54,$ff, $a8,$ff, $54,$ff, $aa,$ff
|
|
db $dd,$62, $bf,$42, $fd,$42, $bf,$40, $ff,$00, $ff,$00, $f7,$08, $ef,$18
|
|
db $ff,$00, $ff,$00, $ff,$00, $ab,$7c, $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7e
|
|
db $f9,$07, $fc,$03, $fd,$03, $fe,$01, $ff,$01, $fe,$01, $ff,$01, $fe,$01
|
|
db $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7e, $d5,$7e, $ab,$7c
|
|
db $f7,$18, $eb,$1c, $d7,$3c, $eb,$3c, $d5,$3e, $ab,$7e, $d5,$7e, $2a,$ff
|
|
db $ff,$01, $fe,$01, $ff,$01, $fe,$01, $ff,$01, $fe,$01, $ff,$01, $a2,$ff
|
|
db $7f,$c0, $bf,$c0, $7f,$c0, $bf,$e0, $5f,$e0, $af,$f0, $57,$fc, $aa,$ff
|
|
db $ff,$01, $fc,$03, $fd,$03, $fc,$03, $f9,$07, $f0,$0f, $c1,$3f, $82,$ff
|
|
db $55,$ff, $2a,$ff, $55,$ff, $2a,$ff, $55,$ff, $2a,$ff, $55,$ff, $00,$ff
|
|
db $45,$ff, $a2,$ff, $41,$ff, $82,$ff, $41,$ff, $80,$ff, $01,$ff, $00,$ff
|
|
db $54,$ff, $aa,$ff, $54,$ff, $aa,$ff, $54,$ff, $aa,$ff, $54,$ff, $00,$ff
|
|
db $15,$ff, $2a,$ff, $15,$ff, $0a,$ff, $15,$ff, $0a,$ff, $01,$ff, $00,$ff
|
|
db $01,$ff, $80,$ff, $01,$ff, $80,$ff, $01,$ff, $80,$ff, $01,$ff, $00,$ff
|
|
TilesEnd:
|
|
|
|
SECTION "Tilemap", ROM0
|
|
|
|
Tilemap:
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $01, $02, $03, $01, $04, $03, $01, $05, $00, $01, $05, $00, $06, $04, $07, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $08, $09, $0a, $0b, $0c, $0d, $0b, $0e, $0f, $08, $0e, $0f, $10, $11, $12, $13, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $14, $15, $16, $17, $18, $19, $1a, $1b, $0f, $14, $1b, $0f, $14, $1c, $16, $1d, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $1e, $1f, $20, $21, $22, $23, $24, $22, $25, $1e, $22, $25, $26, $22, $27, $1d, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $01, $28, $29, $2a, $2b, $2c, $2d, $2b, $2e, $2d, $2f, $30, $2d, $31, $32, $33, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $08, $34, $0a, $0b, $11, $0a, $0b, $35, $36, $0b, $0e, $0f, $08, $37, $0a, $38, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $14, $39, $16, $17, $1c, $16, $17, $3a, $3b, $17, $1b, $0f, $14, $3c, $16, $1d, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $1e, $3d, $3e, $3f, $22, $27, $21, $1f, $20, $21, $22, $25, $1e, $22, $40, $1d, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $41, $42, $43, $44, $30, $33, $41, $45, $43, $41, $30, $43, $41, $30, $33, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, 0,0,0,0,0,0,0,0,0,0,0,0
|
|
TilemapEnd:
|
|
|
|
SECTION "Graphics", ROM0
|
|
GfxCat:
|
|
INCBIN "cat.2bpp"
|
|
.end::
|
|
|
|
CatMetasprite:
|
|
db 16, 8, 0, 0
|
|
db 12, 16, 0, 0
|
|
db 20, 20, 0, 0
|
|
db 24, 12, 0, 0
|
|
db 128
|
|
|
|
ShadowMetasprite:
|
|
db 24, 12, 0, 0
|
|
db 128
|
|
|
|
SECTION "Position Vars", WRAM0
|
|
; Q12.4 fixed-point X posiition
|
|
wMetaspritePosition::
|
|
.x:
|
|
dw
|
|
.y:
|
|
dw
|
|
.z:
|
|
dw
|
|
|
|
; Q4.4 fixed-point velocity
|
|
wMetaspriteVelocity::
|
|
.x:
|
|
dw
|
|
.y:
|
|
dw
|
|
.z:
|
|
dw
|
|
|
|
SECTION "Joypad Vars", WRAM0
|
|
wJoypadState:
|
|
ds 1
|
|
wJoypadPressed:
|
|
ds 1
|