Fix the EHZ Deformation bug
From Sonic Retro
Revision as of 10:34, 15 September 2017 by MainMemory (talk | contribs) (fixing grammar and formatting)
Revision as of 10:34, 15 September 2017 by MainMemory (talk | contribs) (fixing grammar and formatting)
(Original guide by qiuu)
In Sonic 2 is in EHZ a small deformation bug, the lowest two layers don't scroll as they are not affected by the deformation code:
To fix this, go to SwScrl_EHZ:. Scroll down until you see SwScrl_RippleData:. Above it you should have this piece of code:
move.w #($B4)/12-1,d1 ; $B4 bytes
- move.w d4,(a1)+
move.w d3,(a1)+
move.w d4,(a1)+
move.w d3,(a1)+
move.w d4,(a1)+
move.w d3,(a1)+
swap d3
add.l d0,d3
add.l d0,d3
add.l d0,d3
swap d3
dbf d1,-
rts
Copy and paste this code twice into it:
move.w d4,(a1)+
move.w d3,(a1)+
In the end it should look like this:
move.w #($B4)/12-1,d1 ; $B4 bytes
- move.w d4,(a1)+
move.w d3,(a1)+
move.w d4,(a1)+
move.w d3,(a1)+
move.w d4,(a1)+
move.w d3,(a1)+
swap d3
add.l d0,d3
add.l d0,d3
add.l d0,d3
swap d3
dbf d1,-
move.w d4,(a1)+
move.w d3,(a1)+
move.w d4,(a1)+
move.w d3,(a1)+
rts
And that's it! Now it should look fixed:
Sonic 2 Beta
This bug can also be fixed in the Sonic 2 Beta.
Just replace the code with this:
move.w d4,(a1)+
move.w d3,(a1)+
move.w d4,(a1)+
move.w d3,(a1)+
move.w d4,(a1)+
move.w d3,(a1)+
swap d3
add.l d0,d3
add.l d0,d3
add.l d0,d3
swap d3
dbf d1,loc_61B2
move.w d4,(a1)+
move.w d3,(a1)+
move.w d4,(a1)+
move.w d3,(a1)+
rts