SuperSprite and Auto Resize

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SuperSprite and Auto Resize

Postby malcolmr » Fri Jan 07, 2011 3:36 am

I am using a SuperSprite to represent the player avatar in my game. Each Sprite (representing a different walking direction) has "Auto Resize" turned on but "Pixel Perfect" off. The first time each sub-sprite it used it displays correctly, but when the SuperSprite disables it the Width and Height are set to zero. So when the sprite is re-enabled, nothing is shown.
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Re: SuperSprite and Auto Resize

Postby malcolmr » Fri Jan 07, 2011 4:11 am

Ah, it seems the issue is that the individual packed sprites don't have static versions. So when StopAnim calls RevertToStatic, the Sprite is shrunk to (0,0).

Oh, looking into it the code for AutoResize is quite ugly. You divide by the previous uvRect and multiply by the new one? This is a recipe for accumulating floating point errors. There appears to be some hack in there to prevent the sprite from resizing to (0,0), but it doesn't actually do anything.
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Re: SuperSprite and Auto Resize

Postby Brady » Fri Jan 07, 2011 4:24 am

Yes, you'll want to assign at least a place-holder static image. Even if it is a 2x2 texture.

The check for a 0-sized sprite isn't to keep it from sizing to that, but rather one check prevents a divide-by-zero, and the other has to do with how the uvRect is used elsewhere.

The method of tracking size changes, in testing, has shown not to suffer from any noticeable floating point error accumulation in practice. But if you have an efficient alternative you would like to see here, I'd be happy to consider implementing it.
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Re: SuperSprite and Auto Resize

Postby malcolmr » Fri Jan 07, 2011 4:52 am

Brady wrote:Yes, you'll want to assign at least a place-holder static image. Even if it is a 2x2 texture.

But that image will display on the screen, won't it? That is bad.

The method of tracking size changes, in testing, has shown not to suffer from any noticeable floating point error accumulation in practice. But if you have an efficient alternative you would like to see here, I'd be happy to consider implementing it.

Well is seems at the moment you are effectively doing:

width_t = width_0 * w1 / w1 * w2 / w2 * w3 ... / w_t-1 * w_t

which should (barring accumulated fp errors) collapse to

width_t = width_0 * w_t

So if you keep separate variables for "initial width" and "current width" you should be able to compute this both more accurately (no fp errors) and faster (no division step).
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Re: SuperSprite and Auto Resize

Postby malcolmr » Fri Jan 07, 2011 5:02 am

malcolmr wrote:
Brady wrote:Yes, you'll want to assign at least a place-holder static image. Even if it is a 2x2 texture.

But that image will display on the screen, won't it? That is bad.

Oh no wait, that's wrong. The inactive sprites will have their renderers disabled. Good.
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Re: SuperSprite and Auto Resize

Postby Brady » Fri Jan 07, 2011 9:31 pm

Thanks for the suggestion, I'll look into possibly changing it accordingly.
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