[ngseven]

Hi furntree,

thanks a lot for your help and the stuff you tried out! After a lot of frustration with trying out stuff, I switched to PC/Windows for retroarch, but with this new stuff you told us, I’ll check your hints out when I have time. Sounds very interesting!

[ngseven]

Thanks a lot for your help! I’ll see what I can do, maybe the stuff will work when a full OpenGL implementation for the pi exists.

[ngseven]

Update: I looked at the sources of retroarch, and as far as I can see, hard GPU sync is not compiled in if OpenGL ES is used. Hence, I tried to compile retroarch with –enable-opengl but without –enable-gles, but this is not meant to be done since GLES is automatically used on platforms with a videocore GPU. I fiddled a bit with the scripts and the sources, but I cannot get retroarch to run with opengl but without open gl es.

Hence, I think one might solve the problem if one would succeed in compiling retroarch on the pi without GLES, but as I said, no success yet.

Any hint on how to do it would be very welcome.

[ngseven]

Update: I managed to get retroarch and fba-libretro to run on my PC, using the same monitor and USB keyboard as on my PI. Using hard GPU sync on, input lag went down to 2 frames! With hard GPU sync off, I got the same input lag of 4 frames or more as on my PI.

So, at the moment I think that the problem is that hard GPU sync does not work in retroarch on retropie, as I already conjectured above.

Hence, it would be interesting how I could get hard GPU sync to work in retroarch on retropie, e.g., by compiling retroarch with certain options. However, I remember that certain dependencies would have to be included, and I am not a Linux expert, so any suggestions on how to successfully activate hard GPU sync would be very welcome.

Of course, the problem might be then that the processing power of the PI 2 does not suffice for Neo Geo games with hard GPU sync switched on…

[ngseven]

Hi dankcushions, thanks a lot for your suggestions! I’ll try some things out and post it here if I find a solution!

[ngseven]

With respect to the stuff I wrote above, does anyone know if its possible to get hard GPU sync to work in retropie? Do I have to compile retroarch from sources with certain dependencies for that?

[ngseven]

Yes, I did.

So in your opinion, it could be better? Do you know what should be achievable?

Maybe the problem is the display, it’s an LG IPS234 monitor. Didn’t find any measurements on the internet about the monitor’s latency. On the other hand, I checked the input lag of my PC running MAME with that monitor, and that combination only had 3 frames input lag…

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