Why no Lanczos or Spline as filters for games ? \ VOGONS

Why no Lanczos or Spline as filters for games ?

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First post, by rsmu

Posted on 2009-01-02, 21:29

rsmu Offline

Rank Newbie

Rank: Newbie
Posts: 3
Joined: 2009-01-02, 21:15

Hello everybody 😀

I have a question regarding graphic filters used by DosBox and many emulators

This question may be dumb so please don't kill me for it 😊

I was wondering why Lanczos and spline are not used to enhance the rendering of old games just like 2xSAI, HQ3X and others do

Are these filters too CPU intensive or maybe not compatible with the way an emulator renders screens

I have been looking around using google to find an answer but I can see that most of the time Lanczos is only used to deal with icons or videos....

The reason why I am asking is that I can see the way Lanczos and Spline are able to deal with picture resizing (in FFDShow for instance) and the result is impressive in some case.

I believe that if we could resample old DOS games using Lanczos or spline the result could also be impressive

Thank you in advance to whoever will be able to give me an answer

Kind regards

RSMU

Reply 1 of 5, by wd

Posted on 2009-01-02, 22:58

wd Offline

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Rank: DOSBox Author
Posts: 10813
Joined: 2003-12-03, 21:23

They have different focus: generic scaling (nice kernels like sinc) used in
image editing apps, are as slow as they want but can do fractional rescaling;
and integer-rescaling, as 2xSaI or HQxx which is faster but limited to its application.

Reply 2 of 5, by rsmu

Posted on 2009-01-03, 12:16

rsmu Offline

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Rank: Newbie
Posts: 3
Joined: 2009-01-02, 21:15

Oh ok I see

I think I understand your answer but just to make sure

Does it mean that Lanczos and spline could be used but they are not because other rescaling filers such as 2xSaI are more convenient for emulation purpose ?

Once agin sorry to be a pain with my questions and thank you for taking the time to answer 😀