How to run prboom at 60fps while still maintaining original game speed? about libretro-prboom

[Wintermute0110]

I noticed this bug when testing PrBoom core in Kodi Leia. In Retroarch prboom core may run at 35 FPS but Kodi Leia forces the core to run at 60 FPS and hence the game runs very fast (core runs at 60 FPS and game engine thinks it's running at 34 FPS).

Another core with support for uncapped frame rate is required. Good candidates may be PrBoom+ or Crispy Doom. PrBoom+ has the option of software rendering and OpenGL rendering. I will investigate this issue further ...

[vanfanel]

I've just built from git and Xenphor is right: 60FPS is great, smooth as silk as it should be, but the game runs too fast. Having the game run at the right "gameplay" speed but at 60FPS would be great!
May I suggest a 30FPS option if that's not possible? 35, 45 and 50 cause jerky movement as they aren't 60 exact divisors. I know original DOS Doom ran at 35 FPS, but that only made sense on the 70Hz 320x200 mode it used.

[yoyz]

On a android jxd 5110 I had the same issue with retroarch prboom.

It was solved by reducing the cpu speed to 350Mhz with the "setcpu" apps.
I post it there, because it's related : prboom run 2x the original speed on this console.

[Ferk]

I'd be great to have the Eternity engine as a core. It has the advantage of having support for Heretic and plans for Hexen and Strife. There's even a branch with splitscreen support (though it's not clear if it'll ever be merged). It's also based on the same branch of Doom ports as PrBoom (MBF), although they migrated the code to C++ instead of C.

Crispy Doom, although less featureful, is also more faithful to the original Doom, and its code is cleaner. So it'd definitely be a good candidate for a libretro core.

Both of them use SDL2 though.