issues affecting Loki port of Soldier of Fortune

[twolife]

I know there are some issues to get this game to even run on a modern system (it being an ancient SDL 1.1 game), but it is possible, with a real SDL 1.2 or the supplied SDL 1.1.
But unfortunately the game is unplayable with sdl12-compat :'(

I noticed 2 problems (they may be related, or not...)

1. Once you starts a new game, a red icon starts to flickers very quickly in the top left corner & when you move the character it's completely sluggish. It sometime get fast for 5 second before slowing down again. It's horrible.
   

2. If you persist to play (despite the big n°1 problem), the floor sometimes gets instantaneously full of blood, and if you take 2 steps ahead it' gets back to normal
   
   

I don't know if this is a lost cause or if you can pull off some magic, but at least this is now documented ^^

[OlegAckbar]

Red icon and sluggish movement are caused by high refresh rate, limiting in-game fps to 60 fixes the issue.
I can't reproduce bug with red floor

[icculus]

Hmm...@twolife, can you verify?

We could maybe add a quirk to force vsync or just make SDL_GL_SwapBuffers stall to keep to ~60fps.

[OlegAckbar]

@icculus locking framerate to 60 wouldn't be necessary since game can run without issues even at 165 fps. I think best case would be to determine critical framerate for this game since there are 360hz and higher monitors on the market already and forcing vsync could exceed framerate threshold.

[icculus]

We should probably do both, vsync and also wait, so it looks smoother and also doesn't iterate too quickly if the refresh rate is too high. But maybe that's silly, I don't know yet.

[twolife]

ho wow, SDL12COMPAT_SYNC_TO_VBLANK=1 fixed the walking problem & did make the blood problem disappear.
thanks a lot 😃