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

> Hi;
>
> I am trying to port my game Shadow Gangs to the NeoGeo, I got now to the point where
> I can start polishing and optimizing the game.
> I get a glitch on the background scrolls, when the character is moving right, and not
> when he is moving left.
>
> Video bellow shows the issue.
>
> https://www.youtube.com/watch?v=ihFIA4oDINM
>
> On Mame, the glitch is still there, but instead of a empty vertical line, it's like
> white or black small dots or rectangles all over the screen.
>
> -It doesn't happen when moving left on both GNGEO and Mame.
> +Doesn't happen also when the framerate is 60 fps.
> -Doesn't happen when Idle, only when moving.
> -Also, If wait for 2 or 3 Vsyncs or more, it doesn't happen. (But then the game is
> then very slow)
>
> I am not using sticky, and I put the sprites on the correct X position.
>
> The thing that I don't understand, is that it happens only when moving right, not
> left...
>
> Do you guys have an idea what the issue might be?
>
> Thank you for any insight and help.

When are you updating your spritelist? it looks almost like you're doing it mid-frame and getting some sprites from one frame and some sprites from the next on certain lines

maybe there's more processing going on when moving right?

I might be able to find time to work with you and debug the issue if you need closer analysis.