VisualBoyAdvance-M

And...why?

 

Arent the current filters enough?

 

possibly higher quality upsampling (e.g., less blurry).

coming from the AVS forums, one of the experts there (dmunsil) is in favor of using the catmull-rom filter for upsampling:

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http://archive2.avsforum.com/avs-vb/showthread.php?s=&postid=4760581

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if it's not too much of an overhead, maybe someone can create a catmull-rom filter for vba-m.