MAMEWorld Forums - EmuChat - Re: Shadow Gangs (NeoGeo), scrolling issue going right only.

Hi Haze;

Thank you for the reply.
Been fighting with this NeoGeo version for some 4 months now, going from doing in c to c++, then cpu and ram issue (64kb), but I have I think everything now in place for the game, apart the music, sound and the new graphics (they will be redrawn completly).

The two issues that still need addressing now is the framerate, and this weird scroll issue.

I had this issue from start, but didn't look at it until now, as I am moving to polish and optimization.

Been looking at it for 2 days, with no real solution, been going in tangents, and not getting to the real problem of this.

I saw Metal SLug 2 videos, it's a slow game at times 30 fps and didn't see this glitch on it, so I hope there is a solution for it, and always when moving right.

So far, what I found is that when I draw an identical tile all over the screen (for testing), some tiles are more prone to this issue that others (also the palette plays a role)

That's what I found up to now, but still even with "good" tiles, the glitch is there on Mame, but not on GNGEO.

- There is no different processing from left or right, the same cpu time.
- I tried a test program with minimal code, and I can see the issue on it too...

Do you have a discord or any screen share program, I could share my screen and you can see the whole thing.

Can also make a zip with minimal example, but I think a screen share would be great if possible?

(have some other questions related to the NeoGeo, some I don't understand, although I followed the NeoDev wiki on it, examples are some zoom that acts weird on startup).