On Friday, September 28, 2007 11:02 am Ian Romanick wrote:
> Jesse Barnes wrote:
> > On Wednesday, September 26, 2007 6:20 pm Ian Romanick wrote:
> >> I do have one question now. What happens (or is intended to
> >> happen) if the currently bound drawable is not a window?
>
> Any thoughts on this?
No, I'm not sure what should happen in this case. Doing a vblank sync'd
buffer swap or vblank wait on an offscreen drawable doesn't make much
sense does it? In what cases might those calls occur?
> I was thinking of something like:
>
> if (pdraw == NULL) {
> return GLX_BAD_CONTEXT;
> }
>
> if (pdraw->getMSC != NULL) {
> ....
> } else if (psc->driScreen.getMSC != NULL) {
> ....
> }
>
> return (ret == 0) ? 0 : GLX_BAD_CONTEXT;
Ok, that looks good. I'll fix it up.
> I only have a couple other comments.
>
> 1. As Michael pointed out, anything in the driver that accesses
> pdraw->getMSC needs to check the API version first.
Done (I'll do a quick double check though).
> 2. The comment in the function header that the MSC "will never
> decrease" should be amended. I should be able to guarantee that it
> will never decrease for a given drawable, With two displays at
> different refresh rates, an application could see two calls to getMSC
> for different drawables return decreasing values.
Done.
> 3. I'm not very familiar with how the Intel hardware works, but does
> the code guarantee that the MSC won't decrease if a window is moved
> from one display to another?
No, in that case the MSC will change and possibly decrease. But drivers
can handle that case by tracking which output a given drawable is on
(or mostly on), so that the drawable is sync'd to the right value.
> 4. Only semi-related. Have you given any thought to implementing
> getSBC?
Only briefly. It seems it could be done similarly though--by adding an
sbcSeq value to the drawable and letting drivers update it...
Jesse
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