[visionegg] Re: Motion tearing on PC
- From: Andrew Straw <astraw@xxxxxxxxxxx>
- To: visionegg@xxxxxxxxxxxxx
- Date: Mon, 23 Jan 2006 09:24:55 -0800
Hi Doug,
This seems like it's most likely a driver issue.
The first thing to do is to make sure the Vision Egg is actually using
the latest ATI OpenGL drivers. The exact driver information should be
displayed on the console and saved in the log file. If you do have the
latest OpenGL drivers and you still have this problem, I think you have
2 options: 1) install card without such driver issues (e.g. the nVidia
5200 at less than $50) or 2) play around with the new, unannounced
win32_vretrace module to achieve (via your own blood, sweat, and tears)
what the drivers should be doing for you.
Douglas Taylor 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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