Difference between revisions of "Fix Tails' respawn speeds"
From Sonic Retro
KingofHarts (talk | contribs) (New bug guide from RHS... why is someone not paying me? LOL) |
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| − | + | {{GuideBy|redhotsonic}} | |
Quote from ''redhotsonic'' - "The problem here is when you and Tails enter the water, your speed, acceleration and deceleration are decreased, to give you the underwater physics. The problem is, if you lose Tails when underwater, when he next respawns (in Sonic 2, he only respawns when you've come out of water), he will still have his underwater speeds. Hence why Tails suddenly cannot keep up. This bug only occurs when you lose Tails underwater, and his underwater speed will remain this way until he enters/exits water again (no matter how many times you lose him and he respawns)." | Quote from ''redhotsonic'' - "The problem here is when you and Tails enter the water, your speed, acceleration and deceleration are decreased, to give you the underwater physics. The problem is, if you lose Tails when underwater, when he next respawns (in Sonic 2, he only respawns when you've come out of water), he will still have his underwater speeds. Hence why Tails suddenly cannot keep up. This bug only occurs when you lose Tails underwater, and his underwater speed will remain this way until he enters/exits water again (no matter how many times you lose him and he respawns)." | ||
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<asm> | <asm> | ||
loc_1BC68: | loc_1BC68: | ||
| − | + | lea (Sonic_Stat_Record_Buf).w,a2 | |
| − | + | move.b 2(a2,d3.w),d2 | |
| − | + | andi.b #$D2,d2 | |
| − | + | bne.s return_1BCDE | |
| − | + | or.w d0,d1 | |
| − | + | bne.s return_1BCDE | |
; etc... | ; etc... | ||
</asm> | </asm> | ||
| Line 20: | Line 20: | ||
Right after the 2nd "bne.s return_1BCDE" command, insert this: | Right after the 2nd "bne.s return_1BCDE" command, insert this: | ||
<asm> | <asm> | ||
| − | + | move.w #$600,(Tails_top_speed).w ; set Tails' top speed | |
| − | + | move.w #$C,(Tails_acceleration).w ; set Tails' acceleration | |
| − | + | move.w #$80,(Tails_deceleration).w ; set Tails' deceleration | |
</asm> | </asm> | ||
So, you have something like this: | So, you have something like this: | ||
<asm> | <asm> | ||
| − | loc_1BC68: | + | loc_1BC68: ; Fix for Tails' underwater respawn |
| − | + | lea (Sonic_Stat_Record_Buf).w,a2 | |
| − | + | move.b 2(a2,d3.w),d2 | |
| − | + | andi.b #$D2,d2 | |
| − | + | bne.s return_1BCDE | |
| − | + | or.w d0,d1 | |
| − | + | bne.s return_1BCDE | |
| − | + | move.w #$600,(Tails_top_speed).w ; set Tails' top speed | |
| − | + | move.w #$C,(Tails_acceleration).w ; set Tails' acceleration | |
| − | + | move.w #$80,(Tails_deceleration).w ; set Tails' deceleration | |
| − | ; | + | ; etc... |
</asm> | </asm> | ||
Done! Now Tails' respawn speeds are fixed, and when respawning after being lost underwater, he will move and behave normally! | Done! Now Tails' respawn speeds are fixed, and when respawning after being lost underwater, he will move and behave normally! | ||
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==Sonic 3K fix== | ==Sonic 3K fix== | ||
The bug is NOT fixed in S3K either, but to fix it, you have to do an extra check, so follow this S3K fix! | The bug is NOT fixed in S3K either, but to fix it, you have to do an extra check, so follow this S3K fix! | ||
| − | This can be done in '''SVN disassembly'''. | + | This can be done in the '''SVN disassembly'''. |
Go to "loc_13CD2:" and you'll see this: | Go to "loc_13CD2:" and you'll see this: | ||
<asm> | <asm> | ||
loc_13CD2: | loc_13CD2: | ||
| − | + | lea (Stat_table).w,a2 | |
| − | + | move.b 2(a2,d3.w),d2 | |
| − | + | andi.b #$80,d2 | |
| − | + | bne.s loc_13D42 | |
| − | + | or.w d0,d1 | |
| − | + | bne.s loc_13D42 | |
| − | ; | + | ; etc... |
</asm> | </asm> | ||
Right after the 2nd "bne.s loc_13D42" command, insert this: | Right after the 2nd "bne.s loc_13D42" command, insert this: | ||
<asm> | <asm> | ||
| − | + | btst #6,$2A(a0) ; is Tails underwater? | |
| − | + | bne.s .underwater ; if so, branch | |
| − | + | move.w #$600,($FFFFFEC0).w ; set Tails' top speed | |
| − | + | move.w #$C,($FFFFFEC2).w ; set Tails' acceleration | |
| − | + | move.w #$80,($FFFFFEC4).w ; set Tails' deceleration | |
| − | + | .underwater: | |
</asm> | </asm> | ||
So, you have something like this: | So, you have something like this: | ||
<asm> | <asm> | ||
| − | loc_13CD2: | + | loc_13CD2: ; Fix for Tails' underwater respawn |
| − | + | lea (Stat_table).w,a2 | |
| − | + | move.b 2(a2,d3.w),d2 | |
| − | + | andi.b #$80,d2 | |
| − | + | bne.s loc_13D42 | |
| − | + | or.w d0,d1 | |
| − | + | bne.s loc_13D42 | |
| − | + | btst #6,$2A(a0) ; is Tails underwater? | |
| − | + | bne.s .underwater ; if so, branch | |
| − | + | move.w #$600,($FFFFFEC0).w ; set Tails' top speed | |
| − | + | move.w #$C,($FFFFFEC2).w ; set Tails' acceleration | |
| − | + | move.w #$80,($FFFFFEC4).w ; set Tails' deceleration | |
| − | + | .underwater: | |
| − | ; | + | ; etc... |
</asm> | </asm> | ||
| Line 91: | Line 91: | ||
Tails... oh Tails, what a stupid little fucker... never does anything right, does he? But why??? Why does this bug happen to begin with? RedHotSonic explains this in detail: | Tails... oh Tails, what a stupid little fucker... never does anything right, does he? But why??? Why does this bug happen to begin with? RedHotSonic explains this in detail: | ||
| − | Again, | + | Again, quoted from RHS - "Now, when you lose Tails, he goes through lots of commands to move him about and to respawn him on certain conditions. BUT, none of these commands reset Tails' speeds. Because of this, when Tails respawns, he has the exact same speeds as when you lost him. So, if you lose him underwater, when he respawns, he will still have underwater speeds. So, all we've done here is added the command to reset his speeds. So... |
In Sonic 2, all we've done is set Tails to use his normal speeds no matter what when he respawns. This is fine because he only respawns when you're not in water, so he will always be out of water when he arrives. So we want his normal speed. | In Sonic 2, all we've done is set Tails to use his normal speeds no matter what when he respawns. This is fine because he only respawns when you're not in water, so he will always be out of water when he arrives. So we want his normal speed. | ||
Revision as of 09:25, 13 September 2014
(Original guide by redhotsonic)
Quote from redhotsonic - "The problem here is when you and Tails enter the water, your speed, acceleration and deceleration are decreased, to give you the underwater physics. The problem is, if you lose Tails when underwater, when he next respawns (in Sonic 2, he only respawns when you've come out of water), he will still have his underwater speeds. Hence why Tails suddenly cannot keep up. This bug only occurs when you lose Tails underwater, and his underwater speed will remain this way until he enters/exits water again (no matter how many times you lose him and he respawns)."
Sonic 2 fix
This can be done in Xenowhirl's 2007 disassembly or the SVN disassembly.
First, Go to "loc_1BC68:" and you'll see this: <asm> loc_1BC68: lea (Sonic_Stat_Record_Buf).w,a2 move.b 2(a2,d3.w),d2 andi.b #$D2,d2 bne.s return_1BCDE or.w d0,d1 bne.s return_1BCDE
- etc...
</asm>
Right after the 2nd "bne.s return_1BCDE" command, insert this: <asm> move.w #$600,(Tails_top_speed).w ; set Tails' top speed move.w #$C,(Tails_acceleration).w ; set Tails' acceleration move.w #$80,(Tails_deceleration).w ; set Tails' deceleration </asm>
So, you have something like this: <asm> loc_1BC68: ; Fix for Tails' underwater respawn lea (Sonic_Stat_Record_Buf).w,a2 move.b 2(a2,d3.w),d2 andi.b #$D2,d2 bne.s return_1BCDE or.w d0,d1 bne.s return_1BCDE move.w #$600,(Tails_top_speed).w ; set Tails' top speed move.w #$C,(Tails_acceleration).w ; set Tails' acceleration move.w #$80,(Tails_deceleration).w ; set Tails' deceleration
- etc...
</asm> Done! Now Tails' respawn speeds are fixed, and when respawning after being lost underwater, he will move and behave normally! Now that was easy, but wait... are you hacking Sonic 3K also? Oh.. you are? Well then, there's more!
Sonic 3K fix
The bug is NOT fixed in S3K either, but to fix it, you have to do an extra check, so follow this S3K fix! This can be done in the SVN disassembly.
Go to "loc_13CD2:" and you'll see this: <asm> loc_13CD2: lea (Stat_table).w,a2 move.b 2(a2,d3.w),d2 andi.b #$80,d2 bne.s loc_13D42 or.w d0,d1 bne.s loc_13D42
- etc...
</asm>
Right after the 2nd "bne.s loc_13D42" command, insert this: <asm> btst #6,$2A(a0) ; is Tails underwater? bne.s .underwater ; if so, branch move.w #$600,($FFFFFEC0).w ; set Tails' top speed move.w #$C,($FFFFFEC2).w ; set Tails' acceleration move.w #$80,($FFFFFEC4).w ; set Tails' deceleration .underwater: </asm>
So, you have something like this: <asm> loc_13CD2: ; Fix for Tails' underwater respawn lea (Stat_table).w,a2 move.b 2(a2,d3.w),d2 andi.b #$80,d2 bne.s loc_13D42 or.w d0,d1 bne.s loc_13D42 btst #6,$2A(a0) ; is Tails underwater? bne.s .underwater ; if so, branch move.w #$600,($FFFFFEC0).w ; set Tails' top speed move.w #$C,($FFFFFEC2).w ; set Tails' acceleration move.w #$80,($FFFFFEC4).w ; set Tails' deceleration .underwater:
- etc...
</asm>
AGAIN! Easy! Piece of cake! Now Tails will behave properly.
The bug explained
Tails... oh Tails, what a stupid little fucker... never does anything right, does he? But why??? Why does this bug happen to begin with? RedHotSonic explains this in detail:
Again, quoted from RHS - "Now, when you lose Tails, he goes through lots of commands to move him about and to respawn him on certain conditions. BUT, none of these commands reset Tails' speeds. Because of this, when Tails respawns, he has the exact same speeds as when you lost him. So, if you lose him underwater, when he respawns, he will still have underwater speeds. So, all we've done here is added the command to reset his speeds. So...
In Sonic 2, all we've done is set Tails to use his normal speeds no matter what when he respawns. This is fine because he only respawns when you're not in water, so he will always be out of water when he arrives. So we want his normal speed.
In Sonic 3 and Knuckles, we have to do a check first to see if Tails is respawning in water or not. If not, do not bother resetting the speeds because he's going to spawn in water. On the other hand, if not in water, it will reset to his normal speeds because he's going to respawn out of water."