Compress the Sameboy logo. 117 bytes are now free
This commit is contained in:
Jakub Kądziołka
parent
8386aaf12f
commit
c678407d1e
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@ -57,11 +57,10 @@ Start:
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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 DoubleBitsAndWriteRow
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call DoubleBitsAndWriteRow
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call DoubleBitsAndWriteRowTwice
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inc de
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ld a, e
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xor $34 ; End of logo
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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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@ -71,53 +70,24 @@ Start:
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xor a
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ld hl, $8000
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call ClearMemoryPage
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call LoadTileset
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; Copy SameBoy Logo
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ld de, SameboyLogo
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ld hl, $8080
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ld c, (SameboyLogoEnd - SameboyLogo) / 2
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.sameboyLogoLoop
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ld a, [de]
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ldi [hl], a
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inc hl
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inc de
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ld a, [de]
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ldi [hl], a
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inc hl
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inc de
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dec c
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jr nz, .sameboyLogoLoop
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; Copy (unresized) ROM logo
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ld de, $104
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ld c, 6
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.CGBROMLogoLoop
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push bc
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call ReadCGBLogoTile
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pop bc
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dec c
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jr nz, .CGBROMLogoLoop
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inc hl
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call ReadTrademarkSymbol
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; Load Tilemap
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ld hl, $98C2
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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 [$4F], 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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ENDC
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.tilemapLoop
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ld c, $10
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.tilemapRowLoop
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ld [hl], a
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push af
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IF !DEF(FAST)
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; Switch to second VRAM Bank
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ld a, 1
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ldh [$4F], a
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@ -125,25 +95,29 @@ IF !DEF(FAST)
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; Switch to back first VRAM Bank
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xor a
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ldh [$4F], a
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ENDC
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pop af
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ldi [hl], a
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inc a
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add d
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dec c
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jr nz, .tilemapRowLoop
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sub 47
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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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cp $38
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jr nz, .doneTilemap
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dec d
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jr z, .endTilemap
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dec d
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ld hl, $99a7
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ld b, 1
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ld c, 7
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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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.doneTilemap
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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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@ -187,9 +161,7 @@ ENDC
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jr nz, .expandPalettesLoop
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ld hl, BgPalettes
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ld d, 64 ; Length of write
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ld e, c ; Index of write (C=0)
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call LoadBGPalettes
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call LoadBGPalettes64
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; Turn on LCD
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ld a, $91
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@ -560,8 +532,7 @@ TrademarkSymbol:
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db $3c,$42,$b9,$a5,$b9,$a5,$42,$3c
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SameboyLogo:
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incbin "SameboyLogo.1bpp"
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SameboyLogoEnd:
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incbin "SameboyLogo.rle"
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AnimationColors:
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dw $7FFF ; White
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@ -578,7 +549,9 @@ DMGPalettes:
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dw $7FFF, $32BF, $00D0, $0000
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; Helper Functions
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DoubleBitsAndWriteRow:
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DoubleBitsAndWriteRowTwice:
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call .twice
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.twice
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; Double the most significant 4 bits, b is shifted by 4
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ld a, 4
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ld c, 0
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@ -661,7 +634,46 @@ ReadCGBLogoHalfTile:
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ld a, e
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ret
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ReadCGBLogoTile:
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LoadTileset:
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; Copy SameBoy Logo
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ld de, SameboyLogo
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ld hl, $8080
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.sameboyLogoLoop
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ld a, [de]
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inc de
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ld b, a
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and $0f
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jr z, .skipLiteral
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ld c, a
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.literalLoop
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ld a, [de]
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ldi [hl], a
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inc hl
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inc de
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dec c
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jr nz, .literalLoop
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.skipLiteral
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swap b
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ld a, b
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and $0f
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jr z, .sameboyLogoEnd
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ld c, a
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ld a, [de]
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inc de
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.repeatLoop
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ldi [hl], a
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inc hl
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dec c
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jr nz, .repeatLoop
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jr .sameboyLogoLoop
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.sameboyLogoEnd
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; Copy (unresized) ROM logo
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ld de, $104
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.CGBROMLogoLoop
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ld c, $f0
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call ReadCGBLogoHalfTile
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add a, 22
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@ -669,8 +681,10 @@ ReadCGBLogoTile:
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call ReadCGBLogoHalfTile
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sub a, 22
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ld e, a
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ret
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cp $1c
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jr nz, .CGBROMLogoLoop
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inc hl
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; fallthrough
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ReadTrademarkSymbol:
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ld de, TrademarkSymbol
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ld c,$08
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@ -687,7 +701,11 @@ LoadObjPalettes:
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ld c, $6A
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jr LoadPalettes
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LoadBGPalettes64:
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ld d, 64
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LoadBGPalettes:
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ld e, 0
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ld c, $68
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LoadPalettes:
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@ -735,7 +753,23 @@ DoIntroAnimation:
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Preboot:
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IF !DEF(FAST)
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call FadeOut
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ld b, 32 ; 32 times to fade
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.fadeLoop
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ld c, 32 ; 32 colors to fade
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ld hl, BgPalettes
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.frameLoop
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push bc
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call BrightenColor
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pop bc
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dec c
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jr nz, .frameLoop
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call WaitFrame
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call WaitFrame
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ld hl, BgPalettes
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call LoadBGPalettes64
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dec b
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jr nz, .fadeLoop
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ENDC
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call ClearVRAMViaHDMA
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; Select the first bank
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@ -921,9 +955,7 @@ LoadPalettesFromIndex: ; a = index of combination
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ld c, a
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add hl, bc
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ld d, 8
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ld e, 0
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call LoadBGPalettes
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ret
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jp LoadBGPalettes
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BrightenColor:
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ld a, [hli]
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@ -976,28 +1008,6 @@ BrightenColor:
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ld [hli], a
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ret
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FadeOut:
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ld b, 32 ; 32 times to fade
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.fadeLoop
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ld c, 32 ; 32 colors to fade
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ld hl, BgPalettes
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.frameLoop
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push bc
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call BrightenColor
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pop bc
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dec c
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jr nz, .frameLoop
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call WaitFrame
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call WaitFrame
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ld hl, BgPalettes
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ld d, 64 ; Length of write
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ld e, 0 ; Index of write
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call LoadBGPalettes
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dec b
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ret z
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jr .fadeLoop
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ClearVRAMViaHDMA:
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ld hl, $FF51
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@ -1014,8 +1024,7 @@ ClearVRAMViaHDMA:
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ld [hli], a
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; Do it
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ld a, $12
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ld [hl], a
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ld [hl], $12
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ret
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GetInputPaletteIndex:
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@ -1113,9 +1122,7 @@ ChangeAnimationPalette:
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call WaitFrame
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ld hl, BgPalettes
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ld d, 64 ; Length of write
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ld e, 0 ; Index of write
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call LoadBGPalettes
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call LoadBGPalettes64
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; Delay the wait loop while the user is selecting a palette
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ld a, 30
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ldh [WaitLoopCounter], a
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48
BootROMs/logo-compress.c
Normal file
48
BootROMs/logo-compress.c
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@ -0,0 +1,48 @@
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#include <assert.h>
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#include <inttypes.h>
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#include <stdio.h>
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void pair(size_t count, uint8_t byte) {
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static size_t unique_count = 0;
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static uint8_t unique_data[15];
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if (count == 1) {
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unique_data[unique_count++] = byte;
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assert(unique_count <= 15);
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} else {
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assert(count <= 15);
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uint8_t control = (count << 4) | unique_count;
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putchar(control);
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for (size_t i = 0; i < unique_count; i++) {
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putchar(unique_data[i]);
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}
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if (count != 0) {
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putchar(byte);
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} else {
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assert(control == 0);
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}
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unique_count = 0;
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}
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}
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int main(int argc, char *argv[]) {
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size_t count = 1;
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uint8_t byte = getchar();
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int new;
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size_t position = 0;
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while ((new = getchar()) != EOF) {
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if (byte == new) {
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count++;
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} else {
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pair(count, byte);
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byte = new;
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count = 1;
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}
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}
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pair(count, byte);
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pair(0, 0);
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}
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14
Makefile
14
Makefile
@ -322,13 +322,23 @@ $(BIN)/SDL/Shaders: Shaders
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# Boot ROMs
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$(OBJ)/%.1bpp: %.png
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-@$(MKDIR) -p $(dir $@)
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rgbgfx -d 1 -h -o $@ $<
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$(OBJ)/BootROMs/SameboyLogo.rle: $(OBJ)/BootROMs/SameboyLogo.1bpp build/logo-compress
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build/logo-compress < $< > $@
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build/logo-compress: BootROMs/logo-compress.c
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$(CC) $< -o $@
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$(BIN)/BootROMs/agb_boot.bin: BootROMs/cgb_boot.asm
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$(BIN)/BootROMs/cgb_boot_fast.bin: BootROMs/cgb_boot.asm
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$(BIN)/BootROMs/sgb2_boot: BootROMs/sgb_boot.asm
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$(BIN)/BootROMs/%.bin: BootROMs/%.asm
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$(BIN)/BootROMs/%.bin: BootROMs/%.asm $(OBJ)/BootROMs/SameboyLogo.rle
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-@$(MKDIR) -p $(dir $@)
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cd BootROMs && rgbasm -o ../$@.tmp ../$<
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rgbasm -i $(OBJ)/BootROMs/ -i BootROMs/ -o $@.tmp $<
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rgblink -o $@.tmp2 $@.tmp
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dd if=$@.tmp2 of=$@ count=1 bs=$(if $(findstring dmg,$@)$(findstring sgb,$@),256,2304)
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@rm $@.tmp $@.tmp2
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