Center Scroll 3.5

For anyone who uses the "Show full row of tiles" in the level header and notice the level will shift up 1 pixel at the entrance you can change

to

Masked Man

This is because sprites spawn based on the position of the screen, altering the timing of sprites's movement. Recommend anyone using this patch to at least edit the title screen demo to avoid death.

Please note that for technical reasons, the title screen demo becomes bugged, with Mario dying at halfway through.

The new changes works as intended; I just removed from the zip file the internal .git folder which has version control artifacts.

I may have figured out why
I guess I have to apply this to a completely unmodified ROM

Made my ROM crash upon application
No clue why

There's an issue with the Reznor Boss Battle, and Ludwig Von Koopa Boss battle. Simply Mario appears in other unknow place and die, or teleport back to OW. Exist one way to fix it?

is there an uberASM version of this patch? I'd like to use this but only for one level

Tested with: Lunar Magic 3.20, asar 1.71, SA-1 1.32, Snes9x 1.60. Works fine, so accepted.
This update didn't change anything in the code but fixed an issue with Lunar Magic 3.20 and 3.21 (a certain code was changed in 3.20 so an hijack has to be moved in this patch). Note that this version is not compatible with earlier versions of LM (<= 3.11). If you need it, you can grab Center Scroll 3.3 from the version history.

While the game doesn't necessarily crash, upon testing, my knowledge so far:
-The scroll line position is off.

It appears that FuSoYa have moved the code that initializes the BG position and scroll line.

EDIT: issue is fixed. See release here.

This patch causes problems when used on Lunar Magic 3.2X version.

Tested with Asar v1.71, BSNES v112, LM 3.11, SA-1 v1.32. Works as intended, accepted.

Use this tool, drag the file onto the console window (after opening asar.exe), and hit ENTER, then do the same with the ROM, then enter.

Note: due to a discovered bug someone reported, this version crashes on vertical levels. Consider using this one instead.

all i want is an easy to use file that fixes the broken screen scroll. i have no idea how to write code or write patches or any of that stuff at all.

OK how do i use it...? having to learn everything the hard way cuz everyone thinks this stuff is no brainer.

Uh, it's a patch, not an uberasm code. You only use uberasm to write your own code that sets the scroll lines position.

so i got this error when applying this asm:
CenterScroll.asm: error: Missing load/init/main/nmi label.

It seems a new hijack appeared on $00F77B.

This seems to cause crashing on vertical levels. Tried with lunar magic versions 3.00 and 3.11 on a fresh rom.

Actually, I got it working not long after I commented.

What define setting are you using?

Having an issue with the camera violently shaking after applying the patch. I set it up just as directed.

Very nice patch. ∑ Would love to see an UberASM version!!

This patch modifies LM code due to LM hijack relating to scrolling the screen to load layer 1 tiles as well as level loading to make sure the static cam region is centered properly.

Make sure you're using LM v3.03 or higher. As the code jumped from $009708 have been changed.

i got this error:
centerscroll.asm:84: error: (E5158): Assertion failed: Hijack for Horizontal Scroll Fix from Lunar Magic not detected! [assert read1($009708) == $22,"Hijack for Horizontal Scroll Fix from Lunar Magic not detected!"]
please help

Is this customisable to make the region >1 pixel?

Crashes 8MB SA-1 ROM

Tested with:
Asar v1.71, Lunar Magic v3.02 (checking if it still works with the previous), Lunar Magic v3.03, SA-1 Pack v1.31, Snes9x v1.55

Works without issue.

Fixed a crashing issue that LM 3.03 changed the freespace code that jumped from $009708.

@Daizo Dee Von and Flat5Games

What version of Asar are you using? I never experienced issues.

I'm getting the same error as well.

I am getting this error when trying to add patch:

centerscroll.asm:120: error: Unknown function. [if and(equal(0,0),notequal(0,0))]

Any idea why this is happening?

Worked fine with LM 3.01. Since in my tests I could not detect any bugs enough to warrant a removal, I'll accept this one.

how about a parallax scrolling

CenterScrollAdvanced.asm:47: error: Assertion failed: Save at least one level in lunar magic! [assert read1($00F6E4) == $5C,"Save at least one level in lunar magic!"]
CenterScrollAdvanced.asm:70: error: SNES address $8D000C doesn't map to ROM [nop #6]

? I have saved a level in lunar magic and have free ram in that area... Any help?

Can this patch be used on a per-level basis? Perhaps with UberASM? I have a level that requires vertical scroll at will, and with vanilla camera effects works great, but with this patch because the camera follows mario, some sprites get despawned when they go off screen.

EDIT: Or perhaps if possible have the effects of this patch be incorporated into a block that activates the centered camera for the duration of the level, then reverts back when the level finishes or when a 'revert camera' block is touched.

Edit 2: Scratch all that, you just need to put this in the code:


In the bit inside the InitScrollPos label, the DEC instruction has to be replaced with the instruction to increment the accumulator by $0F instead, this is most noticeable when using Layer 2 V-Scroll: Constant.

I tried to use

but it just didn’t work for some odd reason, whereas 15 INC instructions did.

Edit: This only has to be done when BG v-scroll start is C0, because the equivalent FG v-scroll is CF.

A lot of unoptimized code:
- You don't need to switch the data bank in the Advanced version, it'll be faster to do LDA.l label,x since you're only accessing one table in total.
- You don't need PHP/PLP in such small code range. Not only that, the code that requires the original processor flags is restored right at the before you even push.

Fun fact: readmes are supposed to be user friendly, not a wall of unrelated text that average user: a) Doesn't understand; b) Doesn't care about. If the moderator, which knows about these things, has problems understanding what it goes on about, don't you think it's a good indication to start either shortening them or at least including a separate quick guide?

But neither of those I ound removal worthy, and it works, so approved. I don't really like this kind of scrolling personally but some do.

Fixed the issue with layer 2 initial Y position when using constant Y scroll + both layer 1 and 2 at the lowest.

It's a lot like the Super Mario Land 2 camera. Nice.

Thanks!

A nice patch that changes how the camera works, it could allow for a different gameplay style. Good work!

It works perfectly, but it completely screws up MarioE's Wall Kick patch. That's not your fault, I'm just pointing it out.

Hijack address note:
$00CDF6 to $00CE76, 00F72C to $00F758, $00F789 to $00F79B, and $00F810 to $00F8AA/$00F814 are skipped.

It is a really good patch for certain gimmicks and game styles. To fix certain scroll issues, you need to download and use both Horizontal Scroll Fix and Vertical Scroll Fix. This issue isn't caused by the patch but by SMW engine itself.

How does that happen, is it because it's past the last screen in the level?

This patch does have a minor flaw that can be easily corrected, if you are at the sides of the screen, garbage tiles appear, to fix that, look and download Horizontal Scroll Fix.

wait, you mean that the code AFTER jumping from $00F6E4 is not always in a fixed location? Dang it! Also, does gfx+2 patch happens if you use BG2 and BG3 after inserting exgfx?

This patch requires the gfx+2 patch to be installed at a very specific location. By default, the patch is inserted exactly there, but I suspect it's not if the ROM is expanded to 4MB.

Either way, fix your nonsensical requirements, GHB. Use assert read1($00F6E4) == $5C and org read3($00F6E5).

And double check the SA-1 support, you missed the assert there and I suspect you may have missed more.

I am having the same problem as Mindevous. It will not work. I think it is the patch, not the actual rom.

Very useful for levels with walljumps !

Tip : With my ROM expanded to 2MB i had a message : Address out of bounds. So i expanded my ROM to 3MB and it worked perfectly

@Kaisaan it works only with "Vertical Scroll at Will" ;)

@Mindevous

Did you save at least 1 level in LM?

I get this error, and I don't know what I'm doing wrong:

Frankly, I have no idea what to use this for other than when in desperate need of 4 additional bytes of free RAM.
But whatever, good job I guess.

It should still work, all it does is move the two scroll lines so that they are merged into 1 pixel.

What if vertical scroll and/or horizontal scrolling is disabled for a level?