Re: How to receive the Vertical Retrace Interrupt.

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Michael J. Shannon (shannon++at++husqvarna.engr.sgi.com)
Mon, 6 Feb 1995 16:59:53 -0800

It is my understanding that the glXSwapBUffers() call puts the process
to sleep when the process tries to do a subsequent GL operation, until
a vertical retrace interrupt wakes the process up.

So, if you do glXSwapBuffers() followed by simple no-op graphics
operation, you'll get blocked until vertical retrace, at which point
you resume after the no-op graphics op.

Just do a simple graphics op which tries to access the
graphics pipe after your glXSwapBuffers.

On Feb 3, 2:10pm, Ralph Humphries wrote:
> Subject: Re: How to receive the Vertical Retrace Interrupt.
> Marc,
>
> OpenGL also provides access to the VSync signal. Does this help?
>
> -rh
>
>
> On Feb 3, 9:13am, Marc SIMON Presales support wrote:
> > Subject: How to receive the Vertical Retrace Interrupt.
> > Hi all,
> >
> > I would like for scheduling a customer simulation to synchronize the
> > Graphics RE2 with the application.
> >
> > I would like to manage the Vertical Retrace Interrupt to schedule the
> > simulation.
> >
> > I know that we can do this with FRS and with Performer but the customer
> > don't want to use this tools presently.
> >
> > So if you know how to manage this Interrupt thanks to give me some ideas.

-- 
	Mike Shannon shannon++at++sgi.com
	cyberspace cyberspace information superhighway ha ha ha so there

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