View source for Separate ending art from GHZ/make Ending load alternate art

{{GuideBy|JGMR}}<br>
''(Based on [[SCHG How-to:Separate title art from GHZ/make GHZ load alternate art|this guide]] by [[User:MKAmeX|MKAmeX]] and originally by [[User:Shadow05|Shadow05]])''

The title says it all. After completing the [[SCHG How-to:Separate title art from GHZ/make GHZ load alternate art|previous guide]], this guide will make the Ending sequence for Sonic 1 to load a different art file, allowing you to have custom level art for the Ending sequence that won't appear in the Title or in GHZ.

Note that this guide is optional; you might not want to follow this guide unless you want the art for GHZ, the title screen and the ending sequence separated.

==Hivebrain's 2005 disasssembly==

First, we'll need to have a copy of GHZ's level art file:

Simply copy '8x8ghz.bin' and rename it as 8x8end.bin.

With that done, we now have our Ending sequence art (8x8end.bin), the GHZ art (8x8ghz.bin), and our Title Screen art (8x8ghz1.bin + 8x8ghz2.bin). Now we can edit the code to this art separately.

First, open ''_inc/Main level load blocks.asm''.

Find this:

<syntaxhighlight lang="asm">
        dc.l Nem_GHZ_2nd        ; main load block for ending
</syntaxhighlight>

Change '''Nem_GHZ_2nd''' to '''Nem_Ending''', you should be left with this:

<syntaxhighlight lang="asm">
        dc.l Nem_Ending ; main load block for ending
</syntaxhighlight>

This is pointless as this particular pointer is never used, but it'll keep things tidy.

Next, open ''sonic1.asm'' and look for:

<syntaxhighlight lang="asm">Nem_GHZ:        incbin  artnem\8x8ghz.bin       ; GHZ primary patterns
                even</syntaxhighlight>

Add this after '''Nem_GHZ:''':
<syntaxhighlight lang="asm">Nem_Ending:     incbin  artnem\8x8end.bin       ; Ending sequence primary patterns
                even</syntaxhighlight>

It should look like:

<syntaxhighlight lang="asm">Blk16_GHZ:	incbin	map16\ghz.bin
		even
Nem_GHZ:	incbin	artnem\8x8ghz.bin	; GHZ primary patterns
		Even
Nem_Ending:	incbin	artnem\8x8end.bin	; Ending sequence primary patterns
		even
Nem_GHZ_1st:	incbin	artnem\8x8ghz1.bin	; Title Screen only
		even
Nem_GHZ_2nd:	incbin	artnem\8x8ghz2.bin	; Title Screen only
		even
Blk256_GHZ:	incbin	map256\ghz.bin
		even</syntaxhighlight>

Next, open ''_inc/Pattern load cues.asm'' and find: 

<syntaxhighlight lang="asm">PLC_Ending:	dc.w $E
		dc.l Nem_GHZ_1st	; GHZ main patterns
		dc.w 0
		dc.l Nem_GHZ_2nd	; GHZ secondary	patterns
		dc.w $39A0</syntaxhighlight>

Change '''Nem_GHZ_1st''' to '''Nem_Ending''', remove '''Nem_GHZ_2nd's''' entry, and change the '''dc.w $E''' to '''dc.w $D'''.
Your code should look like this.

<syntaxhighlight lang="asm">PLC_Ending:	dc.w $D
		dc.l Nem_Ending	; Ending sequence main patterns
		dc.w 0</syntaxhighlight>

Load up your ROM and it should load correctly. Though you won't be able to tell the difference between the Ending sequence, Title screen, and GHZ art unless you edit it.

==SVN/GitHub disassembly==

First, we'll need to have a copy of GHZ's level art file:

Simply copy '8x8 - GHZ.bin' and rename it as 8x8 - Ending.bin.

With that done, we now have our Ending sequence art (8x8 - Ending.bin), the GHZ art (8x8 - GHZ.bin), and our Title Screen art (8x8 - GHZ1.bin + 8x8 - GHZ2.bin). Now we can edit the code to this art separately.

First, open ''_inc/LevelHeaders.asm''.

Find this:

<syntaxhighlight lang="asm">
	lhead	0,		Nem_GHZ_2nd,	0,		Blk16_GHZ,	Blk256_GHZ,	bgm_SBZ,	palid_Ending	; Ending
</syntaxhighlight>

Change '''Nem_GHZ_2nd''' to '''Nem_Ending''', you should be left with this:

<syntaxhighlight lang="asm">	lhead	0,		Nem_Ending,	0,		Blk16_GHZ,	Blk256_GHZ,	bgm_SBZ,	palid_Ending	; Ending</syntaxhighlight>

This is pointless as this particular pointer is never used, but it'll keep things tidy.

Next, open ''sonic.asm'' and look for:

<syntaxhighlight lang="asm">Nem_GHZ:	incbin	"artnem\8x8 - GHZ.bin"	; GHZ primary patterns
		even</syntaxhighlight>

Add this after '''Nem_GHZ:''':
<syntaxhighlight lang="asm">Nem_Ending:	incbin	"artnem\8x8 - Ending.bin"	; Ending sequence primary patterns
		even</syntaxhighlight>

It should look like:

<syntaxhighlight lang="asm">Blk16_GHZ:	incbin	"map16\GHZ.bin"
		even
Nem_GHZ:	incbin	"artnem\8x8 - GHZ.bin"	; GHZ primary patterns
		even
Nem_Ending:	incbin	"artnem\8x8 - Ending.bin"	; Ending sequence primary patterns
		even
Nem_GHZ_1st:	incbin	"artnem\8x8 - GHZ1.bin"	; Title Screen only
		even
Nem_GHZ_2nd:	incbin	"artnem\8x8 - GHZ2.bin"	; Title Screen only
		even
Blk256_GHZ:	incbin	"map256\GHZ.bin"
		even</syntaxhighlight>

Next, go to ''_inc/Pattern Load Cues.asm'' and find: 

<syntaxhighlight lang="asm">PLC_Ending:	dc.w ((PLC_Endingend-PLC_Ending-2)/6)-1
		plcm	Nem_GHZ_1st,0		; GHZ main patterns
		plcm	Nem_GHZ_2nd, $39A0	; GHZ secondary	patterns</syntaxhighlight>

Change '''Nem_GHZ_1st''' to '''Nem_Ending''' and remove '''Nem_GHZ_2nd's''' entry.
Your code should look like this:

<syntaxhighlight lang="asm">PLC_Ending:	dc.w ((PLC_Endingend-PLC_Ending-2)/6)-1
		plcm	Nem_Ending,0		; Ending sequence main patterns</syntaxhighlight>

Load up your ROM and it should load correctly. Though you won't be able to tell the difference between the Ending sequence, Title screen, and GHZ art unless you edit it.

Also, if you're going to be editing the art, you may want to edit the blocks and chunks, but luckily those are separated between the GHZ, Ending sequence and Title screen. Have fun with your new art!

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