Limiting framerate / timestep when player's GPU doesn't support vsync?

[RonanZero]

My game is fixed-timestep based. 60 updates per second. Some players with old GPUs / cheap laptops have an issue where the framerate is above 60, completely uncapped, causing it to speed up, even though I have vsync enabled in conf.lua and added cases for higher hz monitors. I don't *need* a 60fps lock, just a 60hz timestep lock where love.update() is only called up to 60 times per second or something, doesn't matter how many times love.draw() is called. How can I force only 60 updates per second without the power of vsync?

Note: I know about deltatime and I'm not planning to use it, the game is already coded for a fixed update rate, deltatime is for variable update rates.

[grump]

I don't think there is an easy way to decouple the number of calls to update() and draw(), they're all done in the same loop by default.

You could love.timer.sleep in each frame for the remainder of the time slice. A good way to do this would probably be to supply our own love.run, with a dynamic sleep duration to match your 60 Hz maximum.

[Azhukar]

Here's some interesting insight on the topic https://www.factorio.com/blog/post/fff-70

[zorg]

How about you do use deltatime in the following (or similar) way:

Code: Select all

local accum = 0.0
love.update = function(dt)
    accum = accum + dt
    if accum >= timestep then
        -- do actual update stuff here
        accum = accum - timestep
    end
end

Edit: edited, thanks grump!

[grump]

Code: Select all

    if accum > timestep then

accum >= timestep?