I'm not an expert regarding this, but I found this information that might be useful:
https://clouard.users.greyc.fr/Pantheon/experiments/rescaling/index-en.html
And for the Lanczos algorithm, you should click on the image, it redirects here: https://clouard.users.greyc.fr/Pantheon/experiments/rescaling/index-en.html#lanczos
One of the advantages of Lanczos resampling filter is that it has no artifacts and a low contrast loss rate, which may come in handy for this project.
I found this if it is of any help.
It lists a few algorithms and gives some explanation of them and the kernel formulas behind them.
Sadly'm not a technical director and don't know enough about how to implement them to be of much more help than that, but either Lanczos or catmull-rom should probably give the best results I'd wager.
http://bertolami.com/index.php?engine=blog&content=posts&detail=inside-imagine-kernels
Last edited by espen,
Yes, this is indeed useful! While reading around I also found this, which almost exactly describes how the Matrix unit works: https://clouard.users.greyc.fr/Pantheon/experiments/rescaling/index-en.html#convolution
HOLY SHIT, this is so fucking useful! I was trying to look at the source code, but this post explains really well how some of the algos work.
The reason most scale matrixes are so awfully low quality in TWPatch is because I don't understand subpixel interpolation, and thus I end up messing up the pixel offset, and thus "delaminate" the whole image.
Damn, I'll dig into this more, as this could help me solve the delamination problem by eliminating the human from the matrix generation, and just let some code generate the scale matrixes for me.
I'm glad this will help with improvements, I'm looking forward the new scaling filters that may be added in future releases of your patcher
Yea, upscaling is an art. I have mad respect for the people who make these algorithms. Your filters honestly aren't that bad, not perfect, but far from awful in most cases (not sure what you did to make Linear 2 though, that one is far inferior)
The DS to 3DS resampling is a bit of an edgecase as we really, really wish we could have integer scaling, but can't; and the resolution difference isn't high enough to just ignore some pixel lines and have it be a bit too small or big without any issues.
So we want something that creates a very sharp almost aliased image, but isn't so aliased that we run into the same issues as using a nearest neighbor type filter would do.
Usually you want a very smooth image with anti aliasing and good edge sharpening, not this time.
I don't know about you but I prefer my Pokemon sprites crisp rather than smooth.
The DS to 3DS resampling is a bit of an edgecase as we really, really wish we could have integer scaling, but can't; and the resolution difference isn't high enough to just ignore some pixel lines and have it be a bit too small or big without any issues.
So we want something that creates a very sharp almost aliased image, but isn't so aliased that we run into the same issues as using a nearest neighbor type filter would do.
Usually you want a very smooth image with anti aliasing and good edge sharpening, not this time.
I don't know about you but I prefer my Pokemon sprites crisp rather than smooth.
As I said, it's because of the "sliding" scale filter to compensate for the lack of subpixel interpolation in the hardware, and I messed up the sliding, and accidently just made the image "delaminated".
Yeah. Although it's not integer scaling, we have fractional scaling where both the divider and the dividee are between 1 and 8.
For example, my GBA scale filter uses 6/4 for height, and 5/3 (
) for width. You can calculate the resulting resolutions from the source resolution of 240x160:- 240 * 5 / 3 is 400
- 160 * 6 / 4 is 240
which just happens to be the top screen resolution of the 3DS.
Sure, it's not perfect integer upscaling, but at least they aren't some disgusting fraction, or a non-fraction non-integer number, so it's easier to create a "sliding" matrix for use in hardware accelerators.
That version of the patcher hasn't been released yet.
It's intentionally not linked YET. The currently public version of the patcher is just a """"quick"""" techdemo to show that this is possible. The 2nd public version will have much more features I intended to include with the first version, but didn't have enough time and energy.
Ok thanks
Take your time
Oh and for energy... i guess you need some sleep?
Nah, I only need an AC. Otherwise I'd be fine, and I'd be already releasing the 3rd or 4th public build. It's just difficult to work while you're dizzy from the heat stroke xD
It's almost the same as it was before, except a bit more code written to prepare for multiple screenful of settings.
As for the updates, none, other than the more pleasant colder weather.
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