Game Boy Color >> Assembly

Palette(OAM)

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參考資訊：
1. bgb
2. rgbds
3. gambatte
4. DMGreport

每個像素使用2bits表示(4個顏色)，相較於BG，OAM使用00代表透明顏色，因此，OAM只能顯示3個顏色


每一個Palette有4個顏色可以設定，共有8個Palette可以使用


每個顏色由15bits組成


設定的方式則是透過OCPS(設定位址)、OCPD(設定資料)


main.s

OAMRAM      equ $fe00
LCDC        equ $ff40
LCDCF_OBJ8  equ %00000000
LCDCF_OBJON equ %00000010

section "vblank", rom0[$0040]
    reti

section "lcdc", rom0[$0048]
    reti

section "timer", rom0[$0050]
    reti

section "serial", rom0[$0058]
    reti

section "joypad", rom0[$0060]
    reti

section "entry", rom0[$0100]
    nop
    jp _start

section "header", rom0[$0104]
    db $ce, $ed, $66, $66, $cc, $0d, $00, $0b, $03, $73, $00, $83, $00, $0c, $00, $0d
    db $00, $08, $11, $1f, $88, $89, $00, $0e, $dc, $cc, $6e, $e6, $dd, $dd, $d9, $99
    db $bb, $bb, $67, $63, $6e, $0e, $ec, $cc, $dd, $dc, $99, $9f, $bb, $b9, $33, $3e
    db "0123456789abcde"
    db $80
    db 0, 0
    db 0
    db 0
    db 0
    db 0
    db 1
    db $33
    db 0
    db 0
    dw 0

_start:
    di

    ld a, [LCDC]
    or LCDCF_OBJON
    or LCDCF_OBJ8
    ld [LCDC], a

    ld d, 32
    ld bc, tile
    ld hl, $8000
copy_tile:
    ld a, [bc]
    ld [hl+], a
    inc bc
    dec d
    jr nz, copy_tile

    ld b, 0
    ld hl, color
copy_palette:
    ld a, b
    ld [$ff6a], a
    ld a, [hl]
    ld [$ff6b], a
    inc hl
    inc b
    ld a, b
    cp 8
    jr nz, copy_palette

    ld hl, OAMRAM + 0
    ld [hl], 30
    ld hl, OAMRAM + 1
    ld [hl], 30
    ld hl, OAMRAM + 2
    ld [hl], 1
    ld hl, OAMRAM + 3
    ld [hl], 0

    jp @

color:
    dw $7fff
    dw $001f
    dw $03e0
    dw $7c00

tile:
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000
    db %00000000

    db %11111111
    db %00000000
    db %11111111
    db %00000000
    db %11111111
    db %00000000
    db %11111111
    db %00000000
    db %11111111
    db %00000000
    db %11111111
    db %00000000
    db %11111111
    db %00000000
    db %11111111
    db %00000000

設定OBJ0的位置(y:30, x:30)、CHR(1)、屬性(0)，CHR其實就是一般稱呼的Tile，而Sprite則是由Tile組合而成的圖形

完成

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