[visionegg] Re: Motion tearing on PC

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
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