OpenGL: turning off and on vsync

DarkDragon · Post by **DarkDragon** » Sun Feb 15, 2004 8:57 am

Hello,

I heard, that you can turn off and on vsync with OpenGL. Do somebody know how I can do this?

Num3 · Post by **Num3** » Sun Feb 15, 2004 1:53 pm

If you own a Nvidia board get Rivatuner, there is an option to disable Vsync for OpenGl and DirectX.

This is done inside the registry, but i don't know where.

DarkDragon · Post by **DarkDragon** » Sun Feb 15, 2004 3:30 pm

Thanks, but I want to do this in the OpenGL-application.

Blade · Post by **Blade** » Sun Feb 15, 2004 7:03 pm

Standard OpenGL hasn't such feature.
Perhaps some hardware-specific extension has, but don't expect to work in many video cards...

DarkDragon · Post by **DarkDragon** » Mon Feb 16, 2004 6:13 pm

ohh, thx.

techjunkie · Post by **techjunkie** » Tue Feb 17, 2004 1:18 am

Can this help?

http://oss.sgi.com/projects/ogl-sample/ ... ontrol.txt

techjunkie · Post by **techjunkie** » Tue Feb 17, 2004 1:23 am

or maybe this... The same thing really...

Use this extension if available:
wglSwapControl = (PFNWGLEXTSWAPCONTROLPROC) wglGetProcAddress("wglSwapIntervalEXT");
and this to set the retrace to 1, 0 disables vsync.

wglSwapControl(1);

From this forum,

http://www.opengl.org/discussion_boards ... 00178.html

DarkDragon · Post by **DarkDragon** » Thu Feb 19, 2004 3:37 pm

thx, but I don't know what (PFNWGLEXTSWAPCONTROLPROC) is. I think it is a structure, but how is the structure build?
I mean:

Code: Select all

Structure
  Value1.l
  Value2.f
Endstructure

and why can't I use the command wglSwapControl() ???

dmoc · Post by **dmoc** » Thu Feb 19, 2004 11:08 pm

"pfn..." pointer-to-function. It's an address returned by wglGetProcAddress() or something similar. Check out win sdk for "wgl" functions.