[visionegg] Re: Motion tearing on PC

You're most welcome! Feel free to borrow as helpful!

Best,

Simeon

On 1/23/06, Alex Holcombe <holcombea@xxxxxxxxxxxxx> wrote:
> hi Simeon,
> thanks for creating that wiki for installing the kubovy lab's VisionEgg
> setup
> it looks very useful for when I have to set up some new machines in the
> future
>
> cheers
> Alex
>
> On 23 Jan 2006, at 16:03, Simeon Fitch wrote:
>
> > Does your driver's "Advanced" settings tab have an option to turn
> > on/off vertical refresh syncing? I'm not a windows user or an expert
> > on these things, but I believe a lot of "gamers" like to have vertical
> > refresh syncing turned *off* by default. Not sure why, but I seem to
> > remember seeing a setting to control this on a friend's computer.
> >
> > Best,
> >
> > Simeon
> >
> > On 1/20/06, Douglas Taylor <dtaylor@xxxxxxx> wrote:
> >> Hi All,
> >>
> >> I have a motion stimulus that is made up of dots
> >> that I've tested on a Mac and a PC and it runs fine
> >> on both systems except on the PC it tears. It is synced
> >> with the VBL(both thru Visionegg and the ATI control panel)
> >>  and I get back the correct frame rate
> >> so it looks like the PC is blitting from the back to front
> >> buffer during a swap buffers whereas the MAC is
> >> page-flipping. The card in the PC is a AGP Radeon 7000.
> >> Not the fastest of cards but they work fine on the MAC.
> >> I experienced this before on MACS when OS9 came out
> >> and you could allocate GWorlds in VRAM a CopyBits
> >> would always tears in VRAM but not in normal ram.
> >> It's consistent with blitting from the bottom up cause the
> >> bottom portion of the stimulus is ahead of the top portion and
> >> the higher your resolution the further down the screen the tear
> >> appears. I know the Mac page flips
> >> but I don't know about Windows or whether this is in the ATI
> >> driver or the Windows side. If it's on the Windows side it should
> >> appear on all cards unless the blit speed is so fast that a whole
> >> frame can be blitted during the VBL. Has anyone else seen this?
> >> Thanks much,
> >>
> >> Doug Taylor
> >>
> >>
> >> ======================================
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> >>
> >
> >
> > --
> > Simeon H.K. Fitch, Owner
> > Mustard Seed Software
> > 1634 Brandywine Drive
> > Charlottesville, VA  22901
> > 210.867.1616
> > ======================================
> > The Vision Egg mailing list
> > Archives: http://www.freelists.org/archives/visionegg
> > Website: http://www.visionegg.org/mailinglist.html
> >
>    Alex Holcombe
>
> ` HolcombeA@xxxxxxxxxxxxx
>    W:+44(0)29 2087 0141  M:+44(0)79 6361 8875
>    http://www.cardiff.ac.uk/psych/holcombea
>
> ======================================
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>


--
Simeon H.K. Fitch, Owner
Mustard Seed Software
1634 Brandywine Drive
Charlottesville, VA  22901
210.867.1616
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