how to make Bottom 2 lines invisible ?

sjyune · Post by **sjyune** » Wed May 31, 2006 5:22 am

I would like to make some changes in Snes9x so that bottom 2 lines disappear just like Zsnes...i mean ...what code/change in Zsnes Source ?
i heard this is correct behaviour...
can any developer here shed light on this ?

please help .....

thanks...

Reznor007 · Post by **Reznor007** » Thu Jun 01, 2006 1:33 am

The bottom line SHOULD be visible. I have a screenshot from my real SNES showing the last line that some emus cut out.

sjyune · Post by **sjyune** » Thu Jun 01, 2006 7:21 am

Indeed !!....i rechecked my Snes..Yes ..those 2 lines are visible and most of time they are used for rendering (no gabage there)
then now my question is : why Zsnes cut out those 2 lines ?
as far as i know Zsnes is only emu that hides those two lines at bottom..

byuu · Post by **byuu** » Thu Jun 01, 2006 8:00 am

A lot of emulators incorrectly cut off one of the last lines. It's mostly to avoid people complaining about garble in the 2-3% of games that don't render any data to the last line. Nobody notices on TVs since that area is clipped off anyway.

creaothceann · Post by **creaothceann** » Thu Jun 01, 2006 8:18 am

sjyune wrote:why Zsnes cut out those 2 lines ?

Because the SNES does not display the first line (used for loading sprite data), so the entire image is shifted up by 1.

Firon · Post by **Firon** » Thu Jun 01, 2006 8:24 am

So that's why I always see the resolution mentioned as 256x223...

byuu · Post by **byuu** » Thu Jun 01, 2006 9:16 am

Sigh. The resolution is 256x224. 256x224.

Line 0 (the first line) is not rendered, it's used to preprocess data for the PPU.
Lines 1-224 (yes, this is 224 lines) are rendered. Most emulators cut off line 224 because it can sometimes have corrupted data on it if the developers choose to ignore it.
Lines 225 and above are for vertical blanking and nothing is rendered to them.

Firon · Post by **Firon** » Thu Jun 01, 2006 10:26 am

Whoops. Thanks for clearing that up.

Post by **grinvader** » Thu Jun 01, 2006 12:58 pm

ZSNES renders 222 lines (2->223) on some ports due to internal issues that will eventually be fixed, end of discussion.

Post by **pagefault** » Thu Jun 01, 2006 11:28 pm

Just an update, we now render 224 lines in all ports. So no more black lines at the bottom.

Post by **grinvader** » Thu Jun 08, 2006 11:05 pm

pagefault wrote:Just an update, we now render 224 lines in all ports. So no more black lines at the bottom.

Err... do we ? SVN-updated SDL port here still has 223 lines in GUI and 222 in game, for GL modes and soft modes as well.