Detecting if VSYCN on or off?
Blitz3D Forums/Blitz3D Programming/Detecting if VSYCN on or off?
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| I'm trying to write a function to detect whether or not Vsync is on or off. My project uses a frame limiter and Vwait if Vync is off to limit the framerate. I've tried passing a global to the function and so far it just doesn't work right. Does anyone know how I can do this with Blitz code or by use of a external dll? To make it worth someones time I will offer a free low poly model of whatever you request. |
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| You could try looping a flip command- if no vsync is off you should get a miniscule frame time with no drawing being done. |
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| When Vsync if off I get 62 FPS, when it's on it stays locked at 60 and drops to 58 at the most. I guess I could do a simple check regarding FPS but its really not detecting the hardware. |
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| Also, on Windows 8 fullscreen you'll be limited to ~30fps, no matter if you use vsync or not. (It's a win8 bug, with all dx7 games) |
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| Thanks for the heads up but I'm already familiar with this Microsoft issue. I've posted in quite a few threads about this. Solutions like Softpixel and Xors3d offer DX9 support so at least we have a work around. My project has some bad image tearing without Vsync on. It's not very noticeable on a CRT but very obvious on LCD monitors. |
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| I'm not sure if there is a way to detect if VSync is forced via the GPU drivers reliably - it wouldn't be enough to check for 60Hz as some people will be using 75, 120, 144, etc. Hz displays. Best thing to do with a situation like that anyhow is to have an option the user can change as forcing a set framerate can potentially be very annoying if people have setups that don't fall exactly inline with your ideal target setup. |
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| couldn't you simply: t=Millisecs() for i=0 to 1000 vwait next if (millisecs()-t)<2 then print "is off" |
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