On Fri, Dec 13, 2002 at 01:15:01PM -0800, Sottek, Matthew J wrote:
> The i810's vblank interrupt does not go to the CPU's interrupt
> controller IIRC. Therefore you have to poll for vblank by reading
> the current scanline.
That's quite surprising to me.
> Usually apps that are waiting on vblank can be better served by
> solving the actual problem rather than trying to use a generic wait
> For vblank solution.
>
> i.e. If you want to blit to the FB and don't want to see tearing,
> the i810 can pause the DMA stream until a vblank. So issue the wait
> for vblank before your blit and there is no need for your app to
> worry about it.
> Or, if you want the overlay to flip synchronous with vblank... The
> Hardware already does that for you.
So, how do you delay the flip-blit to the vblank but NOT delay other
rendering? I think that would also make it difficult to implement things
like {GLX,WGL}_SGI_swap_control or {GLX,WGL}_OML_sync_control.
--
Smile! http://antwrp.gsfc.nasa.gov/apod/ap990315.html
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