1245 lines
25 KiB
NASM
1245 lines
25 KiB
NASM
; SameBoy CGB bootstrap ROM
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INCLUDE "hardware.inc"
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SECTION "BootCode", ROM0[$0]
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Start:
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; Init stack pointer
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ld sp, $fffe
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; Clear memory VRAM
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call ClearMemoryPage8000
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; Clear OAM
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ld h, $fe
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ld c, $a0
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.clearOAMLoop
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ldi [hl], a
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dec c
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jr nz, .clearOAMLoop
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IF !DEF(CGB0)
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; Init waveform
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ld c, $10
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ld hl, $FF30
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.waveformLoop
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ldi [hl], a
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cpl
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dec c
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jr nz, .waveformLoop
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ENDC
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; Clear chosen input palette
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ldh [InputPalette], a
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; Clear title checksum
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ldh [TitleChecksum], a
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; Init Audio
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ld a, $80
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ldh [rNR52], a
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ldh [rNR11], a
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ld a, $f3
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ldh [rNR12], a
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ldh [rNR51], a
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ld a, $77
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ldh [rNR50], a
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; Init BG palette
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ld a, $fc
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ldh [rBGP], a
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; Load logo from ROM.
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; A nibble represents a 4-pixels line, 2 bytes represent a 4x4 tile, scaled to 8x8.
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; Tiles are ordered left to right, top to bottom.
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; These tiles are not used, but are required for DMG compatibility. This is done
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; by the original CGB Boot ROM as well.
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ld de, $104 ; Logo start
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ld hl, $8010 ; This is where we load the tiles in VRAM
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.loadLogoLoop
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ld a, [de] ; Read 2 rows
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ld b, a
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call DoubleBitsAndWriteRowTwice
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inc de
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ld a, e
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cp $34 ; End of logo
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jr nz, .loadLogoLoop
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call ReadTrademarkSymbol
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; Clear the second VRAM bank
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ld a, 1
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ldh [rVBK], a
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call ClearMemoryPage8000
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call LoadTileset
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ld b, 3
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IF DEF(FAST)
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xor a
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ldh [rVBK], a
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ELSE
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; Load Tilemap
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ld hl, $98C2
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ld d, 3
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ld a, 8
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.tilemapLoop
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ld c, $10
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.tilemapRowLoop
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call .write_with_palette
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; Repeat the 3 tiles common between E and B. This saves 27 bytes after
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; compression, with a cost of 17 bytes of code.
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push af
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sub $20
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sub $3
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jr nc, .notspecial
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add $20
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call .write_with_palette
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dec c
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.notspecial
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pop af
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add d ; d = 3 for SameBoy logo, d = 1 for Nintendo logo
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dec c
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jr nz, .tilemapRowLoop
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sub 44
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push de
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ld de, $10
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add hl, de
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pop de
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dec b
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jr nz, .tilemapLoop
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dec d
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jr z, .endTilemap
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dec d
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ld a, $38
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ld l, $a7
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ld bc, $0107
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jr .tilemapRowLoop
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.write_with_palette
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push af
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; Switch to second VRAM Bank
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ld a, 1
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ldh [rVBK], a
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ld [hl], 8
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; Switch to back first VRAM Bank
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xor a
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ldh [rVBK], a
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pop af
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ldi [hl], a
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ret
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.endTilemap
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ENDC
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; Expand Palettes
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ld de, AnimationColors
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ld c, 8
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ld hl, BgPalettes
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xor a
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.expandPalettesLoop:
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cpl
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; One white
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ld [hli], a
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ld [hli], a
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; Mixed with white
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ld a, [de]
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inc e
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or $20
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ld b, a
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ld a, [de]
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dec e
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or $84
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rra
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rr b
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ld [hl], b
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inc l
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ld [hli], a
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; One black
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xor a
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ld [hli], a
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ld [hli], a
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; One color
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ld a, [de]
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inc e
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ld [hli], a
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ld a, [de]
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inc e
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ld [hli], a
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xor a
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dec c
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jr nz, .expandPalettesLoop
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call LoadPalettesFromHRAM
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; Turn on LCD
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ld a, $91
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ldh [rLCDC], a
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IF !DEF(FAST)
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call DoIntroAnimation
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ld a, 48 ; frames to wait after playing the chime
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ldh [WaitLoopCounter], a
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ld b, 4 ; frames to wait before playing the chime
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call WaitBFrames
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; Play first sound
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ld a, $83
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call PlaySound
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ld b, 5
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call WaitBFrames
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; Play second sound
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ld a, $c1
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call PlaySound
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.waitLoop
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call GetInputPaletteIndex
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call WaitFrame
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ld hl, WaitLoopCounter
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dec [hl]
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jr nz, .waitLoop
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ELSE
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ld a, $c1
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call PlaySound
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ENDC
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call Preboot
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IF DEF(AGB)
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ld b, 1
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ENDC
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jr BootGame
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HDMAData:
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db $D0, $00, $98, $A0, $12
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db $D0, $00, $80, $00, $40
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SECTION "BootGame", ROM0[$fe]
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BootGame:
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ldh [rBANK], a ; unmap boot ROM
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SECTION "MoreStuff", ROM0[$200]
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; Game Palettes Data
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TitleChecksums:
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db $00 ; Default
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db $88 ; ALLEY WAY
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db $16 ; YAKUMAN
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db $36 ; BASEBALL, (Game and Watch 2)
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db $D1 ; TENNIS
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db $DB ; TETRIS
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db $F2 ; QIX
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db $3C ; DR.MARIO
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db $8C ; RADARMISSION
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db $92 ; F1RACE
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db $3D ; YOSSY NO TAMAGO
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db $5C ;
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db $58 ; X
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db $C9 ; MARIOLAND2
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db $3E ; YOSSY NO COOKIE
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db $70 ; ZELDA
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db $1D ;
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db $59 ;
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db $69 ; TETRIS FLASH
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db $19 ; DONKEY KONG
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db $35 ; MARIO'S PICROSS
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db $A8 ;
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db $14 ; POKEMON RED, (GAMEBOYCAMERA G)
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db $AA ; POKEMON GREEN
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db $75 ; PICROSS 2
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db $95 ; YOSSY NO PANEPON
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db $99 ; KIRAKIRA KIDS
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db $34 ; GAMEBOY GALLERY
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db $6F ; POCKETCAMERA
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db $15 ;
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db $FF ; BALLOON KID
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db $97 ; KINGOFTHEZOO
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db $4B ; DMG FOOTBALL
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db $90 ; WORLD CUP
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db $17 ; OTHELLO
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db $10 ; SUPER RC PRO-AM
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db $39 ; DYNABLASTER
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db $F7 ; BOY AND BLOB GB2
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db $F6 ; MEGAMAN
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db $A2 ; STAR WARS-NOA
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db $49 ;
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db $4E ; WAVERACE
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db $43 ;
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db $68 ; LOLO2
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db $E0 ; YOSHI'S COOKIE
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db $8B ; MYSTIC QUEST
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db $F0 ;
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db $CE ; TOPRANKINGTENNIS
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db $0C ; MANSELL
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db $29 ; MEGAMAN3
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db $E8 ; SPACE INVADERS
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db $B7 ; GAME&WATCH
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db $86 ; DONKEYKONGLAND95
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db $9A ; ASTEROIDS/MISCMD
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db $52 ; STREET FIGHTER 2
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db $01 ; DEFENDER/JOUST
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db $9D ; KILLERINSTINCT95
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db $71 ; TETRIS BLAST
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db $9C ; PINOCCHIO
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db $BD ;
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db $5D ; BA.TOSHINDEN
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db $6D ; NETTOU KOF 95
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db $67 ;
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db $3F ; TETRIS PLUS
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db $6B ; DONKEYKONGLAND 3
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; For these games, the 4th letter is taken into account
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FirstChecksumWithDuplicate:
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; Let's play hangman!
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db $B3 ; ???[B]????????
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db $46 ; SUP[E]R MARIOLAND
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db $28 ; GOL[F]
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db $A5 ; SOL[A]RSTRIKER
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db $C6 ; GBW[A]RS
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db $D3 ; KAE[R]UNOTAMENI
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db $27 ; ???[B]????????
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db $61 ; POK[E]MON BLUE
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db $18 ; DON[K]EYKONGLAND
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db $66 ; GAM[E]BOY GALLERY2
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db $6A ; DON[K]EYKONGLAND 2
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db $BF ; KID[ ]ICARUS
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db $0D ; TET[R]IS2
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db $F4 ; ???[-]????????
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db $B3 ; MOG[U]RANYA
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db $46 ; ???[R]????????
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db $28 ; GAL[A]GA&GALAXIAN
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db $A5 ; BT2[R]AGNAROKWORLD
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db $C6 ; KEN[ ]GRIFFEY JR
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db $D3 ; ???[I]????????
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db $27 ; MAG[N]ETIC SOCCER
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db $61 ; VEG[A]S STAKES
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db $18 ; ???[I]????????
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db $66 ; MIL[L]I/CENTI/PEDE
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db $6A ; MAR[I]O & YOSHI
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db $BF ; SOC[C]ER
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db $0D ; POK[E]BOM
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db $F4 ; G&W[ ]GALLERY
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db $B3 ; TET[R]IS ATTACK
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ChecksumsEnd:
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PalettePerChecksum:
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palette_index: MACRO ; palette, flags
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db ((\1)) | (\2) ; | $80 means game requires DMG boot tilemap
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ENDM
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palette_index 0, 0 ; Default Palette
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palette_index 4, 0 ; ALLEY WAY
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palette_index 5, 0 ; YAKUMAN
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palette_index 35, 0 ; BASEBALL, (Game and Watch 2)
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palette_index 34, 0 ; TENNIS
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palette_index 3, 0 ; TETRIS
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palette_index 31, 0 ; QIX
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palette_index 15, 0 ; DR.MARIO
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palette_index 10, 0 ; RADARMISSION
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palette_index 5, 0 ; F1RACE
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palette_index 19, 0 ; YOSSY NO TAMAGO
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palette_index 36, 0 ;
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palette_index 7, $80 ; X
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palette_index 37, 0 ; MARIOLAND2
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palette_index 30, 0 ; YOSSY NO COOKIE
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palette_index 44, 0 ; ZELDA
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palette_index 21, 0 ;
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palette_index 32, 0 ;
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palette_index 31, 0 ; TETRIS FLASH
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palette_index 20, 0 ; DONKEY KONG
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palette_index 5, 0 ; MARIO'S PICROSS
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palette_index 33, 0 ;
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palette_index 13, 0 ; POKEMON RED, (GAMEBOYCAMERA G)
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palette_index 14, 0 ; POKEMON GREEN
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palette_index 5, 0 ; PICROSS 2
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palette_index 29, 0 ; YOSSY NO PANEPON
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palette_index 5, 0 ; KIRAKIRA KIDS
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palette_index 18, 0 ; GAMEBOY GALLERY
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palette_index 9, 0 ; POCKETCAMERA
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palette_index 3, 0 ;
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palette_index 2, 0 ; BALLOON KID
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palette_index 26, 0 ; KINGOFTHEZOO
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palette_index 25, 0 ; DMG FOOTBALL
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palette_index 25, 0 ; WORLD CUP
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palette_index 41, 0 ; OTHELLO
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palette_index 42, 0 ; SUPER RC PRO-AM
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palette_index 26, 0 ; DYNABLASTER
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palette_index 45, 0 ; BOY AND BLOB GB2
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palette_index 42, 0 ; MEGAMAN
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palette_index 45, 0 ; STAR WARS-NOA
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palette_index 36, 0 ;
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palette_index 38, 0 ; WAVERACE
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palette_index 26, $80 ;
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palette_index 42, 0 ; LOLO2
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palette_index 30, 0 ; YOSHI'S COOKIE
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palette_index 41, 0 ; MYSTIC QUEST
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palette_index 34, 0 ;
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palette_index 34, 0 ; TOPRANKINGTENNIS
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palette_index 5, 0 ; MANSELL
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palette_index 42, 0 ; MEGAMAN3
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palette_index 6, 0 ; SPACE INVADERS
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palette_index 5, 0 ; GAME&WATCH
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palette_index 33, 0 ; DONKEYKONGLAND95
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palette_index 25, 0 ; ASTEROIDS/MISCMD
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palette_index 42, 0 ; STREET FIGHTER 2
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palette_index 42, 0 ; DEFENDER/JOUST
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palette_index 40, 0 ; KILLERINSTINCT95
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palette_index 2, 0 ; TETRIS BLAST
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palette_index 16, 0 ; PINOCCHIO
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palette_index 25, 0 ;
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palette_index 42, 0 ; BA.TOSHINDEN
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palette_index 42, 0 ; NETTOU KOF 95
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palette_index 5, 0 ;
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palette_index 0, 0 ; TETRIS PLUS
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palette_index 39, 0 ; DONKEYKONGLAND 3
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palette_index 36, 0 ;
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palette_index 22, 0 ; SUPER MARIOLAND
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palette_index 25, 0 ; GOLF
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palette_index 6, 0 ; SOLARSTRIKER
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palette_index 32, 0 ; GBWARS
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palette_index 12, 0 ; KAERUNOTAMENI
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palette_index 36, 0 ;
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palette_index 11, 0 ; POKEMON BLUE
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palette_index 39, 0 ; DONKEYKONGLAND
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palette_index 18, 0 ; GAMEBOY GALLERY2
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palette_index 39, 0 ; DONKEYKONGLAND 2
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palette_index 24, 0 ; KID ICARUS
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palette_index 31, 0 ; TETRIS2
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palette_index 50, 0 ;
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palette_index 17, 0 ; MOGURANYA
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palette_index 46, 0 ;
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palette_index 6, 0 ; GALAGA&GALAXIAN
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palette_index 27, 0 ; BT2RAGNAROKWORLD
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palette_index 0, 0 ; KEN GRIFFEY JR
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palette_index 47, 0 ;
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palette_index 41, 0 ; MAGNETIC SOCCER
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palette_index 41, 0 ; VEGAS STAKES
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palette_index 0, 0 ;
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palette_index 0, 0 ; MILLI/CENTI/PEDE
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palette_index 19, 0 ; MARIO & YOSHI
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palette_index 34, 0 ; SOCCER
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palette_index 23, 0 ; POKEBOM
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palette_index 18, 0 ; G&W GALLERY
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palette_index 29, 0 ; TETRIS ATTACK
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Dups4thLetterArray:
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db "BEFAARBEKEK R-URAR INAILICE R"
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; We assume the last three arrays fit in the same $100 byte page!
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PaletteCombinations:
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palette_comb: MACRO ; Obj0, Obj1, Bg
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db (\1) * 8, (\2) * 8, (\3) *8
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ENDM
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raw_palette_comb: MACRO ; Obj0, Obj1, Bg
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db (\1) * 2, (\2) * 2, (\3) * 2
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ENDM
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palette_comb 4, 4, 29
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palette_comb 18, 18, 18
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palette_comb 20, 20, 20
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palette_comb 24, 24, 24
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palette_comb 9, 9, 9
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palette_comb 0, 0, 0
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palette_comb 27, 27, 27
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palette_comb 5, 5, 5
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palette_comb 12, 12, 12
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palette_comb 26, 26, 26
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palette_comb 16, 8, 8
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palette_comb 4, 28, 28
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palette_comb 4, 2, 2
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palette_comb 3, 4, 4
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palette_comb 4, 29, 29
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palette_comb 28, 4, 28
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palette_comb 2, 17, 2
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palette_comb 16, 16, 8
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palette_comb 4, 4, 7
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palette_comb 4, 4, 18
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palette_comb 4, 4, 20
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palette_comb 19, 19, 9
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raw_palette_comb 4 * 4 - 1, 4 * 4 - 1, 11 * 4
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palette_comb 17, 17, 2
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palette_comb 4, 4, 2
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palette_comb 4, 4, 3
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palette_comb 28, 28, 0
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palette_comb 3, 3, 0
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palette_comb 0, 0, 1
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palette_comb 18, 22, 18
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palette_comb 20, 22, 20
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palette_comb 24, 22, 24
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palette_comb 16, 22, 8
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palette_comb 17, 4, 13
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raw_palette_comb 28 * 4 - 1, 0 * 4, 14 * 4
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raw_palette_comb 28 * 4 - 1, 4 * 4, 15 * 4
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raw_palette_comb 19 * 4, 23 * 4 - 1, 9 * 4
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palette_comb 16, 28, 10
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palette_comb 4, 23, 28
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palette_comb 17, 22, 2
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palette_comb 4, 0, 2
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palette_comb 4, 28, 3
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palette_comb 28, 3, 0
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palette_comb 3, 28, 4
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palette_comb 21, 28, 4
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palette_comb 3, 28, 0
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palette_comb 25, 3, 28
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palette_comb 0, 28, 8
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palette_comb 4, 3, 28
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palette_comb 28, 3, 6
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palette_comb 4, 28, 29
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; SameBoy "Exclusives"
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palette_comb 30, 30, 30 ; CGA
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palette_comb 31, 31, 31 ; DMG LCD
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palette_comb 28, 4, 1
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palette_comb 0, 0, 2
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Palettes:
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dw $7FFF, $32BF, $00D0, $0000
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dw $639F, $4279, $15B0, $04CB
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dw $7FFF, $6E31, $454A, $0000
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dw $7FFF, $1BEF, $0200, $0000
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dw $7FFF, $421F, $1CF2, $0000
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dw $7FFF, $5294, $294A, $0000
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dw $7FFF, $03FF, $012F, $0000
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dw $7FFF, $03EF, $01D6, $0000
|
|
dw $7FFF, $42B5, $3DC8, $0000
|
|
dw $7E74, $03FF, $0180, $0000
|
|
dw $67FF, $77AC, $1A13, $2D6B
|
|
dw $7ED6, $4BFF, $2175, $0000
|
|
dw $53FF, $4A5F, $7E52, $0000
|
|
dw $4FFF, $7ED2, $3A4C, $1CE0
|
|
dw $03ED, $7FFF, $255F, $0000
|
|
dw $036A, $021F, $03FF, $7FFF
|
|
dw $7FFF, $01DF, $0112, $0000
|
|
dw $231F, $035F, $00F2, $0009
|
|
dw $7FFF, $03EA, $011F, $0000
|
|
dw $299F, $001A, $000C, $0000
|
|
dw $7FFF, $027F, $001F, $0000
|
|
dw $7FFF, $03E0, $0206, $0120
|
|
dw $7FFF, $7EEB, $001F, $7C00
|
|
dw $7FFF, $3FFF, $7E00, $001F
|
|
dw $7FFF, $03FF, $001F, $0000
|
|
dw $03FF, $001F, $000C, $0000
|
|
dw $7FFF, $033F, $0193, $0000
|
|
dw $0000, $4200, $037F, $7FFF
|
|
dw $7FFF, $7E8C, $7C00, $0000
|
|
dw $7FFF, $1BEF, $6180, $0000
|
|
; SameBoy "Exclusives"
|
|
dw $7FFF, $7FEA, $7D5F, $0000 ; CGA 1
|
|
dw $4778, $3290, $1D87, $0861 ; DMG LCD
|
|
|
|
KeyCombinationPalettes:
|
|
db 1 * 3 ; Right
|
|
db 48 * 3 ; Left
|
|
db 5 * 3 ; Up
|
|
db 8 * 3 ; Down
|
|
db 0 * 3 ; Right + A
|
|
db 40 * 3 ; Left + A
|
|
db 43 * 3 ; Up + A
|
|
db 3 * 3 ; Down + A
|
|
db 6 * 3 ; Right + B
|
|
db 7 * 3 ; Left + B
|
|
db 28 * 3 ; Up + B
|
|
db 49 * 3 ; Down + B
|
|
; SameBoy "Exclusives"
|
|
db 51 * 3 ; Right + A + B
|
|
db 52 * 3 ; Left + A + B
|
|
db 53 * 3 ; Up + A + B
|
|
db 54 * 3 ; Down + A + B
|
|
|
|
TrademarkSymbol:
|
|
db $3c,$42,$b9,$a5,$b9,$a5,$42,$3c
|
|
|
|
SameBoyLogo:
|
|
incbin "SameBoyLogo.pb12"
|
|
|
|
|
|
AnimationColors:
|
|
dw $7FFF ; White
|
|
dw $774F ; Cyan
|
|
dw $22C7 ; Green
|
|
dw $039F ; Yellow
|
|
dw $017D ; Orange
|
|
dw $241D ; Red
|
|
dw $6D38 ; Purple
|
|
dw $7102 ; Blue
|
|
AnimationColorsEnd:
|
|
|
|
; Helper Functions
|
|
DoubleBitsAndWriteRowTwice:
|
|
call .twice
|
|
.twice
|
|
; Double the most significant 4 bits, b is shifted by 4
|
|
ld a, 4
|
|
ld c, 0
|
|
.doubleCurrentBit
|
|
sla b
|
|
push af
|
|
rl c
|
|
pop af
|
|
rl c
|
|
dec a
|
|
jr nz, .doubleCurrentBit
|
|
ld a, c
|
|
; Write as two rows
|
|
ldi [hl], a
|
|
inc hl
|
|
ldi [hl], a
|
|
inc hl
|
|
ret
|
|
|
|
WaitFrame:
|
|
push hl
|
|
ld hl, $FF0F
|
|
res 0, [hl]
|
|
.wait
|
|
bit 0, [hl]
|
|
jr z, .wait
|
|
pop hl
|
|
ret
|
|
|
|
WaitBFrames:
|
|
call GetInputPaletteIndex
|
|
call WaitFrame
|
|
dec b
|
|
jr nz, WaitBFrames
|
|
ret
|
|
|
|
PlaySound:
|
|
ldh [rNR13], a
|
|
ld a, $87
|
|
ldh [rNR14], a
|
|
ret
|
|
|
|
ClearMemoryPage8000:
|
|
ld hl, $8000
|
|
; Clear from HL to HL | 0x2000
|
|
ClearMemoryPage:
|
|
xor a
|
|
ldi [hl], a
|
|
bit 5, h
|
|
jr z, ClearMemoryPage
|
|
ret
|
|
|
|
ReadTwoTileLines:
|
|
call ReadTileLine
|
|
; c = $f0 for even lines, $f for odd lines.
|
|
ReadTileLine:
|
|
ld a, [de]
|
|
and c
|
|
ld b, a
|
|
inc e
|
|
inc e
|
|
ld a, [de]
|
|
dec e
|
|
dec e
|
|
and c
|
|
swap a
|
|
or b
|
|
bit 0, c
|
|
jr z, .dontSwap
|
|
swap a
|
|
.dontSwap
|
|
inc hl
|
|
ldi [hl], a
|
|
swap c
|
|
ret
|
|
|
|
|
|
ReadCGBLogoHalfTile:
|
|
call .do_twice
|
|
.do_twice
|
|
call ReadTwoTileLines
|
|
inc e
|
|
ld a, e
|
|
ret
|
|
|
|
; LoadTileset using PB12 codec, 2020 Jakub Kądziołka
|
|
; (based on PB8 codec, 2019 Damian Yerrick)
|
|
|
|
SameBoyLogo_dst = $8080
|
|
SameBoyLogo_length = (128 * 24) / 64
|
|
|
|
LoadTileset:
|
|
ld hl, SameBoyLogo
|
|
ld de, SameBoyLogo_dst - 1
|
|
ld c, SameBoyLogo_length
|
|
.refill
|
|
; Register map for PB12 decompression
|
|
; HL: source address in boot ROM
|
|
; DE: destination address in VRAM
|
|
; A: Current literal value
|
|
; B: Repeat bits, terminated by 1000...
|
|
; Source address in HL lets the repeat bits go straight to B,
|
|
; bypassing A and avoiding spilling registers to the stack.
|
|
ld b, [hl]
|
|
dec b
|
|
jr z, .sameboyLogoEnd
|
|
inc b
|
|
inc hl
|
|
|
|
; Shift a 1 into lower bit of shift value. Once this bit
|
|
; reaches the carry, B becomes 0 and the byte is over
|
|
scf
|
|
rl b
|
|
|
|
.loop
|
|
; If not a repeat, load a literal byte
|
|
jr c, .simple_repeat
|
|
sla b
|
|
jr c, .shifty_repeat
|
|
ld a, [hli]
|
|
jr .got_byte
|
|
.shifty_repeat
|
|
sla b
|
|
jr nz, .no_refill_during_shift
|
|
ld b, [hl] ; see above. Also, no, factoring it out into a callable
|
|
inc hl ; routine doesn't save bytes, even with conditional calls
|
|
scf
|
|
rl b
|
|
.no_refill_during_shift
|
|
ld c, a
|
|
jr nc, .shift_left
|
|
srl a
|
|
db $fe ; eat the add a with cp d8
|
|
.shift_left
|
|
add a
|
|
sla b
|
|
jr c, .go_and
|
|
or c
|
|
db $fe ; eat the and c with cp d8
|
|
.go_and
|
|
and c
|
|
jr .got_byte
|
|
.simple_repeat
|
|
sla b
|
|
jr c, .got_byte
|
|
; far repeat
|
|
dec de
|
|
ld a, [de]
|
|
inc de
|
|
.got_byte
|
|
inc de
|
|
ld [de], a
|
|
sla b
|
|
jr nz, .loop
|
|
jr .refill
|
|
|
|
; End PB12 decoding. The rest uses HL as the destination
|
|
.sameboyLogoEnd
|
|
ld h, d
|
|
ld l, $80
|
|
|
|
; Copy (unresized) ROM logo
|
|
ld de, $104
|
|
.CGBROMLogoLoop
|
|
ld c, $f0
|
|
call ReadCGBLogoHalfTile
|
|
add a, 22
|
|
ld e, a
|
|
call ReadCGBLogoHalfTile
|
|
sub a, 22
|
|
ld e, a
|
|
cp $1c
|
|
jr nz, .CGBROMLogoLoop
|
|
inc hl
|
|
; fallthrough
|
|
ReadTrademarkSymbol:
|
|
ld de, TrademarkSymbol
|
|
ld c,$08
|
|
.loadTrademarkSymbolLoop:
|
|
ld a,[de]
|
|
inc de
|
|
ldi [hl],a
|
|
inc hl
|
|
dec c
|
|
jr nz, .loadTrademarkSymbolLoop
|
|
ret
|
|
|
|
DoIntroAnimation:
|
|
; Animate the intro
|
|
ld a, 1
|
|
ldh [rVBK], a
|
|
ld d, 26
|
|
.animationLoop
|
|
ld b, 2
|
|
call WaitBFrames
|
|
ld hl, $98C0
|
|
ld c, 3 ; Row count
|
|
.loop
|
|
ld a, [hl]
|
|
cp $F ; Already blue
|
|
jr z, .nextTile
|
|
inc [hl]
|
|
and $7
|
|
jr z, .nextLine ; Changed a white tile, go to next line
|
|
.nextTile
|
|
inc hl
|
|
jr .loop
|
|
.nextLine
|
|
ld a, l
|
|
or $1F
|
|
ld l, a
|
|
inc hl
|
|
dec c
|
|
jr nz, .loop
|
|
dec d
|
|
jr nz, .animationLoop
|
|
ret
|
|
|
|
Preboot:
|
|
IF !DEF(FAST)
|
|
ld b, 32 ; 32 times to fade
|
|
.fadeLoop
|
|
ld c, 32 ; 32 colors to fade
|
|
ld hl, BgPalettes
|
|
.frameLoop
|
|
push bc
|
|
|
|
; Brighten Color
|
|
ld a, [hli]
|
|
ld e, a
|
|
ld a, [hld]
|
|
ld d, a
|
|
; RGB(1,1,1)
|
|
ld bc, $421
|
|
|
|
; Is blue maxed?
|
|
ld a, e
|
|
and $1F
|
|
cp $1F
|
|
jr nz, .blueNotMaxed
|
|
dec c
|
|
.blueNotMaxed
|
|
|
|
; Is green maxed?
|
|
ld a, e
|
|
cp $E0
|
|
jr c, .greenNotMaxed
|
|
ld a, d
|
|
and $3
|
|
cp $3
|
|
jr nz, .greenNotMaxed
|
|
res 5, c
|
|
.greenNotMaxed
|
|
|
|
; Is red maxed?
|
|
ld a, d
|
|
and $7C
|
|
cp $7C
|
|
jr nz, .redNotMaxed
|
|
res 2, b
|
|
.redNotMaxed
|
|
|
|
ld a, e
|
|
add c
|
|
ld [hli], a
|
|
ld a, d
|
|
adc b
|
|
ld [hli], a
|
|
pop bc
|
|
|
|
dec c
|
|
jr nz, .frameLoop
|
|
|
|
call WaitFrame
|
|
call LoadPalettesFromHRAM
|
|
call WaitFrame
|
|
dec b
|
|
jr nz, .fadeLoop
|
|
ENDC
|
|
ld a, 2
|
|
ldh [rSVBK], a
|
|
; Clear RAM Bank 2 (Like the original boot ROM)
|
|
ld hl, $D000
|
|
call ClearMemoryPage
|
|
inc a
|
|
call ClearVRAMViaHDMA
|
|
call _ClearVRAMViaHDMA
|
|
call ClearVRAMViaHDMA ; A = $40, so it's bank 0
|
|
xor a
|
|
ldh [rSVBK], a
|
|
cpl
|
|
ldh [rJOYP], a
|
|
|
|
; Final values for CGB mode
|
|
ld d, a
|
|
ld e, c
|
|
ld l, $0d
|
|
|
|
ld a, [$143]
|
|
bit 7, a
|
|
call z, EmulateDMG
|
|
bit 7, a
|
|
|
|
ldh [rKEY0], a ; write CGB compatibility byte, CGB mode
|
|
ldh a, [TitleChecksum]
|
|
ld b, a
|
|
|
|
jr z, .skipDMGForCGBCheck
|
|
ldh a, [InputPalette]
|
|
and a
|
|
jr nz, .emulateDMGForCGBGame
|
|
.skipDMGForCGBCheck
|
|
IF DEF(AGB)
|
|
; Set registers to match the original AGB-CGB boot
|
|
; AF = $1100, C = 0
|
|
xor a
|
|
ld c, a
|
|
add a, $11
|
|
ld h, c
|
|
; B is set to 1 after ret
|
|
ELSE
|
|
; Set registers to match the original CGB boot
|
|
; AF = $1180, C = 0
|
|
xor a
|
|
ld c, a
|
|
ld a, $11
|
|
ld h, c
|
|
; B is set to the title checksum
|
|
ENDC
|
|
ret
|
|
|
|
.emulateDMGForCGBGame
|
|
call EmulateDMG
|
|
ldh [rKEY0], a ; write $04, DMG emulation mode
|
|
ld a, $1
|
|
ret
|
|
|
|
GetKeyComboPalette:
|
|
ld hl, KeyCombinationPalettes - 1 ; Return value is 1-based, 0 means nothing down
|
|
ld c, a
|
|
ld b, 0
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ret
|
|
|
|
EmulateDMG:
|
|
ld a, 1
|
|
ldh [rOPRI], a ; DMG Emulation sprite priority
|
|
call GetPaletteIndex
|
|
bit 7, a
|
|
call nz, LoadDMGTilemap
|
|
res 7, a
|
|
ld b, a
|
|
add b
|
|
add b
|
|
ld b, a
|
|
ldh a, [InputPalette]
|
|
and a
|
|
jr z, .nothingDown
|
|
call GetKeyComboPalette
|
|
jr .paletteFromKeys
|
|
.nothingDown
|
|
ld a, b
|
|
.paletteFromKeys
|
|
call WaitFrame
|
|
call LoadPalettesFromIndex
|
|
ld a, 4
|
|
; Set the final values for DMG mode
|
|
ld de, 8
|
|
ld l, $7c
|
|
ret
|
|
|
|
GetPaletteIndex:
|
|
ld hl, $14B
|
|
ld a, [hl] ; Old Licensee
|
|
cp $33
|
|
jr z, .newLicensee
|
|
dec a ; 1 = Nintendo
|
|
jr nz, .notNintendo
|
|
jr .doChecksum
|
|
.newLicensee
|
|
ld l, $44
|
|
ld a, [hli]
|
|
cp "0"
|
|
jr nz, .notNintendo
|
|
ld a, [hl]
|
|
cp "1"
|
|
jr nz, .notNintendo
|
|
|
|
.doChecksum
|
|
ld l, $34
|
|
ld c, $10
|
|
xor a
|
|
|
|
.checksumLoop
|
|
add [hl]
|
|
inc l
|
|
dec c
|
|
jr nz, .checksumLoop
|
|
ld b, a
|
|
|
|
; c = 0
|
|
ld hl, TitleChecksums
|
|
|
|
.searchLoop
|
|
ld a, l
|
|
sub LOW(ChecksumsEnd) ; use sub to zero out a
|
|
ret z
|
|
ld a, [hli]
|
|
cp b
|
|
jr nz, .searchLoop
|
|
|
|
; We might have a match, Do duplicate/4th letter check
|
|
ld a, l
|
|
sub FirstChecksumWithDuplicate - TitleChecksums + 1
|
|
jr c, .match ; Does not have a duplicate, must be a match!
|
|
; Has a duplicate; check 4th letter
|
|
push hl
|
|
ld a, l
|
|
add Dups4thLetterArray - FirstChecksumWithDuplicate - 1 ; -1 since hl was incremented
|
|
ld l, a
|
|
ld a, [hl]
|
|
pop hl
|
|
ld c, a
|
|
ld a, [$134 + 3] ; Get 4th letter
|
|
cp c
|
|
jr nz, .searchLoop ; Not a match, continue
|
|
|
|
.match
|
|
ld a, l
|
|
add PalettePerChecksum - TitleChecksums - 1; -1 since hl was incremented
|
|
ld l, a
|
|
ld a, b
|
|
ldh [TitleChecksum], a
|
|
ld a, [hl]
|
|
ret
|
|
|
|
.notNintendo
|
|
xor a
|
|
ret
|
|
|
|
; optimizations in callers rely on this returning with b = 0
|
|
GetPaletteCombo:
|
|
ld hl, PaletteCombinations
|
|
ld b, 0
|
|
ld c, a
|
|
add hl, bc
|
|
ret
|
|
|
|
LoadPalettesFromIndex: ; a = index of combination
|
|
call GetPaletteCombo
|
|
|
|
; Obj Palettes
|
|
ld e, 0
|
|
.loadObjPalette
|
|
ld a, [hli]
|
|
push hl
|
|
ld hl, Palettes
|
|
; b is already 0
|
|
ld c, a
|
|
add hl, bc
|
|
ld d, 8
|
|
ld c, $6A
|
|
call LoadPalettes
|
|
pop hl
|
|
bit 3, e
|
|
jr nz, .loadBGPalette
|
|
ld e, 8
|
|
jr .loadObjPalette
|
|
.loadBGPalette
|
|
;BG Palette
|
|
ld c, [hl]
|
|
; b is already 0
|
|
ld hl, Palettes
|
|
add hl, bc
|
|
ld d, 8
|
|
jr LoadBGPalettes
|
|
|
|
LoadPalettesFromHRAM:
|
|
ld hl, BgPalettes
|
|
ld d, 64
|
|
|
|
LoadBGPalettes:
|
|
ld e, 0
|
|
ld c, LOW(rBGPI)
|
|
|
|
LoadPalettes:
|
|
ld a, $80
|
|
or e
|
|
ld [c], a
|
|
inc c
|
|
.loop
|
|
ld a, [hli]
|
|
ld [c], a
|
|
dec d
|
|
jr nz, .loop
|
|
ret
|
|
|
|
ClearVRAMViaHDMA:
|
|
ldh [rVBK], a
|
|
ld hl, HDMAData
|
|
_ClearVRAMViaHDMA:
|
|
call WaitFrame ; Wait for vblank
|
|
ld c, $51
|
|
ld b, 5
|
|
.loop
|
|
ld a, [hli]
|
|
ldh [c], a
|
|
inc c
|
|
dec b
|
|
jr nz, .loop
|
|
ret
|
|
|
|
; clobbers AF and HL
|
|
GetInputPaletteIndex:
|
|
ld a, $20 ; Select directions
|
|
ldh [rJOYP], a
|
|
ldh a, [rJOYP]
|
|
cpl
|
|
and $F
|
|
ret z ; No direction keys pressed, no palette
|
|
|
|
ld l, 0
|
|
.directionLoop
|
|
inc l
|
|
rra
|
|
jr nc, .directionLoop
|
|
|
|
; c = 1: Right, 2: Left, 3: Up, 4: Down
|
|
|
|
ld a, $10 ; Select buttons
|
|
ldh [rJOYP], a
|
|
ldh a, [rJOYP]
|
|
cpl
|
|
rla
|
|
rla
|
|
and $C
|
|
add l
|
|
ld l, a
|
|
ldh a, [InputPalette]
|
|
cp l
|
|
ret z ; No change, don't load
|
|
ld a, l
|
|
ldh [InputPalette], a
|
|
; Slide into change Animation Palette
|
|
|
|
ChangeAnimationPalette:
|
|
push bc
|
|
push de
|
|
call GetKeyComboPalette
|
|
call GetPaletteCombo
|
|
inc l
|
|
inc l
|
|
ld c, [hl]
|
|
ld hl, Palettes + 1
|
|
add hl, bc
|
|
ld a, [hld]
|
|
cp $7F ; Is white color?
|
|
jr nz, .isWhite
|
|
inc hl
|
|
inc hl
|
|
.isWhite
|
|
push af
|
|
ld a, [hli]
|
|
|
|
push hl
|
|
ld hl, BgPalettes ; First color, all palettes
|
|
call ReplaceColorInAllPalettes
|
|
ld l, LOW(BgPalettes + 2) ; Second color, all palettes
|
|
call ReplaceColorInAllPalettes
|
|
pop hl
|
|
ldh [BgPalettes + 6], a ; Fourth color, first palette
|
|
|
|
ld a, [hli]
|
|
push hl
|
|
ld hl, BgPalettes + 1 ; First color, all palettes
|
|
call ReplaceColorInAllPalettes
|
|
ld l, LOW(BgPalettes + 3) ; Second color, all palettes
|
|
call ReplaceColorInAllPalettes
|
|
pop hl
|
|
ldh [BgPalettes + 7], a ; Fourth color, first palette
|
|
|
|
pop af
|
|
jr z, .isNotWhite
|
|
inc hl
|
|
inc hl
|
|
.isNotWhite
|
|
; Mixing code by ISSOtm
|
|
ldh a, [BgPalettes + 7 * 8 + 2]
|
|
and ~$21
|
|
ld b, a
|
|
ld a, [hli]
|
|
and ~$21
|
|
add a, b
|
|
ld b, a
|
|
ld a, [BgPalettes + 7 * 8 + 3]
|
|
res 2, a ; and ~$04, but not touching carry
|
|
ld c, [hl]
|
|
res 2, c ; and ~$04, but not touching carry
|
|
adc a, c
|
|
rra ; Carry sort of "extends" the accumulator, we're bringing that bit back home
|
|
ld [BgPalettes + 7 * 8 + 3], a
|
|
ld a, b
|
|
rra
|
|
ld [BgPalettes + 7 * 8 + 2], a
|
|
dec l
|
|
|
|
ld a, [hli]
|
|
ldh [BgPalettes + 7 * 8 + 6], a ; Fourth color, 7th palette
|
|
ld a, [hli]
|
|
ldh [BgPalettes + 7 * 8 + 7], a ; Fourth color, 7th palette
|
|
|
|
ld a, [hli]
|
|
ldh [BgPalettes + 4], a ; Third color, first palette
|
|
ld a, [hli]
|
|
ldh [BgPalettes + 5], a ; Third color, first palette
|
|
|
|
|
|
call WaitFrame
|
|
call LoadPalettesFromHRAM
|
|
; Delay the wait loop while the user is selecting a palette
|
|
ld a, 48
|
|
ldh [WaitLoopCounter], a
|
|
pop de
|
|
pop bc
|
|
ret
|
|
|
|
ReplaceColorInAllPalettes:
|
|
ld de, 8
|
|
ld c, e
|
|
.loop
|
|
ld [hl], a
|
|
add hl, de
|
|
dec c
|
|
jr nz, .loop
|
|
ret
|
|
|
|
LoadDMGTilemap:
|
|
push af
|
|
call WaitFrame
|
|
ld a, $19 ; Trademark symbol
|
|
ld [$9910], a ; ... put in the superscript position
|
|
ld hl,$992f ; Bottom right corner of the logo
|
|
ld c,$c ; Tiles in a logo row
|
|
.tilemapLoop
|
|
dec a
|
|
jr z, .tilemapDone
|
|
ldd [hl], a
|
|
dec c
|
|
jr nz, .tilemapLoop
|
|
ld l, $0f ; Jump to top row
|
|
jr .tilemapLoop
|
|
.tilemapDone
|
|
pop af
|
|
ret
|
|
|
|
BootEnd:
|
|
IF BootEnd > $900
|
|
FAIL "BootROM overflowed: {BootEnd}"
|
|
ENDC
|
|
|
|
SECTION "HRAM", HRAM[$FF80]
|
|
TitleChecksum:
|
|
ds 1
|
|
BgPalettes:
|
|
ds 8 * 4 * 2
|
|
InputPalette:
|
|
ds 1
|
|
WaitLoopCounter:
|
|
ds 1
|