Difference between revisions of "Make an Alternative Title Screen"
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(Alternative Title Screen Guide by JcFerggy) |
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Revision as of 14:13, 2 January 2008
This is a guide that JcFerggy wrote, so if you use it, please credit him.
Using the June 2005 Disassembly of Sonic 1, open up sonic1.asm. First search for "Nem_GHZ_1st:". You should see something like this: <asm>; ---------------------------------------------------------------------------
- Compressed graphics - primary patterns and block mappings
- ---------------------------------------------------------------------------
Blk16_GHZ: incbin map16\ghz.bin
even
Nem_GHZ_1st: incbin artnem\8x8ghz1.bin; GHZ primary patterns
even
Nem_GHZ_2nd: incbin artnem\8x8ghz2.bin; GHZ secondary patterns
even
Blk256_GHZ: incbin map256\ghz.bin
even
Blk16_LZ: incbin map16\lz.bin
even
Nem_LZ: incbin artnem\8x8lz.bin; LZ primary patterns
even</asm>
Next, copy the "Blk16_GHZ", "Blk256_GHZ", and "Nem_GHZ_1st", and change "GHZ" to "TS". It should look something like this: <asm>; ---------------------------------------------------------------------------
- Compressed graphics - primary patterns and block mappings
- ---------------------------------------------------------------------------
Blk16_GHZ: incbin map16\ghz.bin
even
Nem_GHZ_1st: incbin artnem\8x8ghz1.bin; GHZ primary patterns
even
Nem_GHZ_2nd: incbin artnem\8x8ghz2.bin; GHZ secondary patterns
even
Blk256_GHZ: incbin map256\ghz.bin
even
Blk16_TS: incbin map16\ts.bin
even
Nem_TS_1st: incbin artnem\8x8ts1.bin; GHZ primary patterns
even
Blk256_TS: incbin map256\ts.bin
even
Blk16_LZ: incbin map16\lz.bin
even</asm>
Now search for "Title_LoadText:". You should see this: <asm>Title_LoadText:
move.w (a5)+,(a6)
dbf d1,Title_LoadText; load uncompressed text patterns
move.b #0,($FFFFFE30).w; clear lamppost counter
move.w #0,($FFFFFE08).w; disable debug item placement mode
move.w #0,($FFFFFFF0).w; disable debug mode
move.w #0,($FFFFFFEA).w
move.w #0,($FFFFFE10).w; set level to GHZ (00)
move.w #0,($FFFFF634).w; disable pallet cycling
bsr.w LevelSizeLoad
bsr.w DeformBgLayer
lea ($FFFFB000).w,a1
lea (Blk16_GHZ).l,a0; load GHZ 16x16 mappings
move.w #0,d0
bsr.w EniDec
lea (Blk256_GHZ).l,a0; load GHZ 256x256 mappings
lea ($FF0000).l,a1
bsr.w KosDec
bsr.w LevelLayoutLoad
bsr.w Pal_FadeFrom
move #$2700,sr
bsr.w ClearScreen
lea ($C00004).l,a5
lea ($C00000).l,a6
lea ($FFFFF708).w,a3
lea ($FFFFA440).w,a4
move.w #$6000,d2
bsr.w LoadTilesFromStart2
lea ($FF0000).l,a1
lea (Eni_Title).l,a0; load title screen mappings
move.w #0,d0
bsr.w EniDec
lea ($FF0000).l,a1
move.l #$42060003,d0
moveq #$21,d1
moveq #$15,d2
bsr.w ShowVDPGraphics
move.l #$40000000,($C00004).l
lea (Nem_GHZ_1st).l,a0; load GHZ patterns
bsr.w NemDec
moveq #1,d0; load title screen pallet
bsr.w PalLoad1
move.b #$8A,d0; play title screen music
bsr.w PlaySound_Special
move.b #0,($FFFFFFFA).w; disable debug mode
move.w #$178,($FFFFF614).w; run title screen for $178 frames
lea ($FFFFD080).w,a1
moveq #0,d0
move.w #7,d1</asm>
In there you will see things relating to "Blk16_GHZ", "Blk256_GHZ", and "Nem_GHZ_1st". Change them from "GHZ" to "TS" also. You should now have something that looks like this: <asm>Title_LoadText:
move.w (a5)+,(a6)
dbf d1,Title_LoadText; load uncompressed text patterns
move.b #0,($FFFFFE30).w; clear lamppost counter
move.w #0,($FFFFFE08).w; disable debug item placement mode
move.w #0,($FFFFFFF0).w; disable debug mode
move.w #0,($FFFFFFEA).w
move.w #0,($FFFFFE10).w; set level to GHZ (00)
move.w #0,($FFFFF634).w; disable pallet cycling
bsr.w LevelSizeLoad
bsr.w DeformBgLayer
lea ($FFFFB000).w,a1
lea (Blk16_TS).l,a0; load GHZ 16x16 mappings
move.w #0,d0
bsr.w EniDec
lea (Blk256_TS).l,a0; load GHZ 256x256 mappings
lea ($FF0000).l,a1
bsr.w KosDec
bsr.w LevelLayoutLoad
bsr.w Pal_FadeFrom
move #$2700,sr
bsr.w ClearScreen
lea ($C00004).l,a5
lea ($C00000).l,a6
lea ($FFFFF708).w,a3
lea ($FFFFA440).w,a4
move.w #$6000,d2
bsr.w LoadTilesFromStart2
lea ($FF0000).l,a1
lea (Eni_Title).l,a0; load title screen mappings
move.w #0,d0
bsr.w EniDec
lea ($FF0000).l,a1
move.l #$42060003,d0
moveq #$21,d1
moveq #$15,d2
bsr.w ShowVDPGraphics
move.l #$40000000,($C00004).l
lea (Nem_TS_1st).l,a0; load GHZ patterns
bsr.w NemDec
moveq #1,d0; load title screen pallet
bsr.w PalLoad1
move.b #$8A,d0; play title screen music
bsr.w PlaySound_Special
move.b #0,($FFFFFFFA).w; disable debug mode
move.w #$178,($FFFFF614).w; run title screen for $178 frames
lea ($FFFFD080).w,a1
moveq #0,d0
move.w #7,d1</asm>
Now, you will be able to load another set of files, but as of yet, you don't have any. Go into "artnem" and make a copy of "8x8ghz1.bin" and "8x8ghz2.bin" and rename them to "8x8ts1.bin" and "8x8ts2.bin". Do the same thing in "map16" and "map256", making a copy of the GHZ files, and renaming them to TS.
Now those TS files you just made will be your new background. You have to edit them the same way you do the regular GHZ files. Also, your new background will still have the layout of your GHZ background, That means the same chunk numbers have to be used. Also, if you want to load the files in SonED2, you need a new project file, so make a copy of an already exsisting one, and replace everything that is in there with this:
Type: 1
Zone ID: 0 Act ID: 0
Object Def: objdef\s1obj
8x8 Tiles: ..\artnem\8x8ts.bin
16x16 Tiles: ..\map16\ts.bin
256x256 Tiles: ..\map256\ts.bin
FG Layout: ..\levels\blank.bin BG Layout: ..\levels\ghzbg.bin
Objects: ..\objpos\blank.bin
Palettes-
Number of files: 1
Palette 1-
Start index: 0 Number of entries: 64 File: ..\pallet\title.bin
Angle Array: ..\collide\anglemap.bin Collision Array: ..\collide\colarray_n.bin Rotated Collision Array: ..\collide\colarray_r.bin
Collision Index 1: ..\collide\blank.bin
-EOF- And that should be everything to get you on your way.