Mysterious Unwanted Sprite Offset

Candall · Post by **Candall** » Sat Oct 31, 2009 1:27 pm

That's right, folks. I have a MUSO on my hands.

So... hi there, first of all. This is my first LUA project, and it's going fairly well so far.

Here's a brief rundown of what I'm doing: I have a script that draws (well, will draw) people to the screen by assembling individual body parts to the right coordinates. The point of this is to allow things such as clothing changes on the fly without having to make more animations.

Now, the problem is that when I flip all of the body parts (by scaling them 1*-1), the torso... for no apparent reason... jumps to the right by ten or fifteen pixels. If I do away with the *-1 that flips the torso, there is no offset. Even when the torso is offset, the biceps and thighs... whose positions are based pretty strictly on the position of the torso... are not offset. I'm sure of two things: Whatever the problem is, it's a stupid, lame oversight... and that I'm going to look and feel like an idiot when it's resolved... but I've re-read my code a million times and for some reason I still can't see it.

Since my work so far is bare-bones and most of it is placeholder anyway, I have no problem with just attaching the .love file.

Any information leading to the arrest of this bug will be rewarded with immense gratitude. Any part of my code that doesn't make sense will be happily explained on the asking.

Youtube · Post by **bartbes** » Sat Oct 31, 2009 1:35 pm

This is a bug in 0.5.0

Candall · Post by **Candall** » Sat Oct 31, 2009 2:10 pm

Oh. Well.

Hmm.

Okay, well, I guess there must be a work-around, then, because this hasn't been happening the whole time. I'll play around with different sizes for the torso (since that's the only variable between "it's working" and "now").

Thanks for the info!

Fizzadar · Post by **Fizzadar** » Sat Oct 31, 2009 2:14 pm

Rather than working around, why not just use a 0.6 build? I'm using it and haven't had any issues so far, seems 100% stable.

Candall · Post by **Candall** » Sat Oct 31, 2009 3:59 pm

Okay, you talked me into it.

So I'm halfway into porting this thing and all of my sprites are drawing stark white with no alpha data. Is this something that'll be fixed in the stable release, or is there something different about "draw"?

Youtube · Post by **bartbes** » Sat Oct 31, 2009 4:43 pm

I think this is related to the size of the images, my guess is that the width and/or height are not a power of 2. Some videocards/drivers can't handle this and just.. draw weird data. In the period before a function has been made to accommodate for this (by padding), you can pad the images yourself.

Candall · Post by **Candall** » Sat Oct 31, 2009 5:11 pm

Yup! That was it. Thanks!

I was puzzled because it wasn't happening before I ported from 0.5.0. New graphics system?

Youtube · Post by **bartbes** » Sat Oct 31, 2009 5:16 pm

No, just stopped padding automatically (it might've been the padding that caused the incorrect mirroring in the first place)

Mysterious Unwanted Sprite Offset

Mysterious Unwanted Sprite Offset

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