[Feature Request]Add turning off scanline for ntsc filter

z4ever · Post by **z4ever** » Tue Dec 23, 2008 4:30 pm

For game with Hi Res,current NTSC filter in zsnes will turn the graphic broken.
But I found NTSC filter in bsnes work as it do not has scanline.

Deathlike2 · Post by **Deathlike2** » Tue Dec 23, 2008 7:56 pm

AFAIK, that is part of the original NTSC filter code. Additionally, BSNES has adapted different code (I don't think it uses blargg's original code directly), so that's why it is different.

Post by **grinvader** » Tue Dec 23, 2008 10:20 pm

ZSNES is not able to deal properly with any resolution-increasing filter over the SNES hires or interlace effects at the moment.

byuu · Post by **byuu** » Tue Dec 23, 2008 10:41 pm

Deathlike2 wrote:AFAIK, that is part of the original NTSC filter code. Additionally, BSNES has adapted different code (I don't think it uses blargg's original code directly), so that's why it is different.

blargg left out scanlines from the NTSC filter. IIRC, we were talking about it and it seemed like a better idea at the time to leave that to the emulator where it may be hardware accelerated, eg have Direct3D blit a 50% translucent scanline overlay on top of the final output. Cuts the RAM<>PCIe bandwidth usage in half, too. Now that I have a half-dozen other drivers that don't support alpha blits, I kind of wish the lib had a software mode too, heh.

I myself use snes_ntsc 0.2.1 as-is. I only changed the _PIXEL_OUT (?) header macro to return colortable[BGR555(n)], rather than the stock RGB565(n).

That said, you have to make sure you give it a linear buffer and a per-scanline width table, height and pitch and it'll handle hires and interlace as expected.

I know the library pretty well, so if you want a hand let me know.

grinvader wrote:ZSNES is not able to deal properly with any resolution-increasing filter over the SNES hires or interlace effects at the moment.

Yeah, the dynamic resolution is a real pain in the ass. Especially half-normal, half-hires screens like SoM 2 / RnH.

I only support that fully with the NTSC filter, and only then because blargg made that filter wrapper for me :P

Post by **grinvader** » Wed Dec 24, 2008 10:37 am

byuu wrote:
grinvader wrote:ZSNES is not able to deal properly with any resolution-increasing filter over the SNES hires or interlace effects at the moment.
Yeah, the dynamic resolution is a real pain in the ass. Especially half-normal, half-hires screens like SoM 2 / RnH.

I only support that fully with the NTSC filter, and only then because blargg made that filter wrapper for me :P

I think there's a good chance the arrays are completely disjointed too, heh.
Doesn't help.