Constant Frame Rate

[gordon1]

hello,

My frame rate is stuck at 60 fps no matter what I do. How can I tell OpenGL to display the frame buffer without waiting for a vertical refresh signal?

I used to use this code to wait before displaying a frame.

while(1) { if (inp(0x3da)&8 == 8) break; }

Apparently, OpenGL is doing this for me whether I want it or not. How do I turn it off?

Thanks for any help.

[k_szczech]

Use WGL_EXT_swap_control. If you set swap hintto 0 you will disable vsync, with 1 (or higher, but that's rarely used) you will enable it.

[gordon1]

Yes, that extension is present on my card, and I'm setting it using wglSwapIntervalEXT(0), but my frame-rate stays at 60. Can you think of any reason why this will not work?

If I disable double-buffering, frame-rate jumps to over 1000 fps.

Thanks.

[yooyo]

Turn off vsync in driver settings pages.

[gordon1]

Thanks, yooyo, I've tried that also with no luck.

Maybe my card (Nvidia) has an issue with this feature on a notebook? I'll continue to look into that.

I am guessing that OpenGL does not care about vsync at all, and it is managed through Windows Wgl.

At least I can see an approximation of the true frame-rate by disabling double-buffer. This was my ultimate goal anyway, as I do not expect any of my apps to be released without double-buffering and vsync on.

[yooyo]

Try another drivers. Visit www.laptopvideo2go.com


This is very confusing...

while(1) { if (inp(0x3da)&8 == 8) break; }

I used such code 10 years ago under DOS when I play with graphics programming. I think it's not working under Windows.

[Dat]

I would say your Control Panel driver settings override anything you set in OpenGL, so you must
disable them there first.