8BPP 512×1024 Background - Summer 2021

This background is using Direct Color Mode and Mode 3.

~~The top part of the background is not neat, but I don't know how to fix it. I would appreciate it if you could suggest a way to solve this problem.~~ (solved)

Referenced source code : https://www.smwcentral.net/?p=viewthread&t=58779, ~~https://www.smwcentral.net/?p=viewthread&t=81116&page=1&pid=1260886#p1260886~~, https://smwc.me/1585658

Download Link : 512×1024 8BPP Beach
(Later I may submit this background to the Graphic section.)

I've only made this background so far, but I might make more of this type of background in the future. But I'm not sure.

If I know how to handle Mode 2 or find the source code, I'm thinking of trying Mode 4 as well.

wow, beach background look neat but background mode 3 is glitchy

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Contact: DT Music and Gaming#8283

YO! This is so cool. I'm amazed someone managed to get those old ExGFX Revolution things to work.

It might straight up be a problem with Lunar Magic, which apparently handles VRAM differently now than it did back in the day. I'm using a Mode 3 BG in a different level and it isn't doing what yours is doing, though... I'm not totally sure what I'm seeing. Is it duplicating the tiles from lower in the BG at the top? Or are you not sure what's going on either?

512x1024 background... That's 16x16 tiles, two backgrounds, stacked vertically, right? It's definitively interesting to see Mode 3 in levels, considering the last patch which allowed for that, ExGFX Revolution, has been broken since quite some time.
There is a small question, though: The background's tilemap uses as much VRAM as layer 1 and 2 normally do. Did you change the pointer of the layer 1 to the normally layer 2 tilemap or is it in the now unused layer 3 portion of VRAM?

Really interesting stuff here, glad to see people is still experimenting crazy stuff with backgrounds. Reminds me when the ExGFX Revolution patch was first released.

Layout made by MaxodeX
2021 TRENO vibe check thread

Originally posted by Darkbloom

YO! This is so cool. I'm amazed someone managed to get those old ExGFX Revolution things to work.

It might straight up be a problem with Lunar Magic, which apparently handles VRAM differently now than it did back in the day. I'm using a Mode 3 BG in a different level and it isn't doing what yours is doing, though... I'm not totally sure what I'm seeing. Is it duplicating the tiles from lower in the BG at the top? Or are you not sure what's going on either?

This background swapped the tilemap pointers for Layer 1 and Layer 2. And I put a graphic with an 8BPP background in the place where layer 3 was.
But I didn't know about the 'ExGFX Revolution Patch Set'.

Source code(before modification): Show/Hide

Code

init:
;er-nobr">
LDA.b #%00010011	; \ mode 3, Set Layer 1 Tile as 16×16
STA.b $3E		; /
LDA.b #%00010010	; \  sprites & layer 2
STA.w $212C		;  | on MainScreen
STA.w $212E		; /
LDA.b #%00000001	; \  layer 1
STA.w $212D		;  | on SubScreen
STA.w $212F		; /

LDA #%00111010 : STA $2107	;  Swap Layer 1 and Layer 1 tilemap, Set 512×1024 BG
LDA #%00110001 : STA $2108	;  Swap Layer 2 and Layer 1 tilemap

LDA #$00
STA $1417|!addr


RTL

main:

LDA #%10100011 : STA $2130

; Layer 1 H-Scroll = Layer 3 H-Scroll
REP #$20 : LDA $22 : SEP #$20
STA $210D : XBA : STA $210D
	
; Layer 1 V-Scroll = Layer 3 V-Scroll. But this code stains the top of the background.
REP #$20 : LDA $24 : SEP #$20
STA $210E : XBA : STA $210E

RTL

On July 8, the source code has been some modifications. Thanks to Ladida for the help.

Source code: Show/Hide

Code

init:
;er-nobr">
LDA.b #%00010011	; \ mode 3, Set Layer 1 Tile as 16×16
STA.b $3E		; /

LDA #%00111010 : STA $2107	;  Swap Layer 1 and Layer 1 tilemap, Set 512×1024 BG
LDA #%00110001 : STA $2108	;  Swap Layer 2 and Layer 1 tilemap

LDA #$01 
STA $1413|!addr

LDA #$01 
STA $1414|!addr

LDA #$00
STA $1417|!addr


RTL

main:

LDA.b #%00010010	; \  sprites & layer 2
STA.w $212C		;  | on MainScreen
STA.w $212E		; /
LDA.b #%00000001	; \  layer 1
STA.w $212D		;  | on SubScreen
STA.w $212F		; /

LDA #%10100011
STA $44

REP #$20
LDA #$0D43
STA $4330
LDA.w #.table
STA $4332
SEP #$20
LDA.b #.table>>16
STA $4334
STA $4337
LDA #$08
TSB $0D9F|!addr
RTL

.table
db $01 : dw $0022|!dp
db $00