March 4th daily NesterDC released

Dr Zoidberg · Post by **Dr Zoidberg** » Sun Mar 03, 2002 10:37 am

Here are the latest changes:

fix Rock Ridge filename handling.
using bilinear filter.
a change on TA driver.

http://nemesis.kaz.ac/~fumihit/nesterdc/daily/

Captain Skyhawk · Post by **Captain Skyhawk** » Sun Mar 03, 2002 10:56 am

using blinear filter?! Wow that does mean it has this same cool option that FrNes has. Have somebody already burn't this one? What's that option like.

Dr Zoidberg · Post by **Dr Zoidberg** » Sun Mar 03, 2002 10:58 am

I'm just about to burn it so I'll see soon. I'm also going to post some images of this new NesterDC at DCEvolution

RockManX · Post by **RockManX** » Sun Mar 03, 2002 8:17 pm

Exactly how does bilinear filtering work, what does it do?

Oz · Post by Oz » Sun Mar 03, 2002 8:27 pm

Whenever you strecth a texture (or in the case of NesterDC, the screen) it will only look the same as the original if you stretch it by a multiple of two. For instance, take a 32x64 image:

now stretch it to 34x70:

Notice that the blocks are not all the same size and there are uneven gaps between them? This is because the extra pixels are rounded to the value of their closest neigbor. NesterDC had the same problem because the NES used a resolution of 256x240, and the dreamcast uses a resolution of 640x480. Now here is the same image with bilinear filtering:

Bilinear filtering fills in these extra pixels by averaging the value of the four surrounding pixels. The resulting image looks closer to the original, but usually has a blurred look. Here is an unfiltered NES image stetched to 640x480:

Now here is the same image with filtering:

The second image does seem a little blurry, but on a TV it is hardly noticible. On scrolling games the effect is more pronounced because the distortion stays in the same places. Filtering gives these games a much more natural look.

*DISCLAIMER* The first three images are not to scale, and actual results may vary.

Captain Skyhawk · Post by **Captain Skyhawk** » Mon Mar 04, 2002 11:56 am

Great explanation Oz! Please note that FrNes uses this same option. And maybe more emu's will follow.

Dr Zoidberg · Post by **Dr Zoidberg** » Mon Mar 04, 2002 12:10 pm

The games in this version of NesterDC do seem to look nicer, although I'll need to load up an older version to be really sure, I might be imagining it.