> Yep. The effect is called shearing or tearing. The way to get rid of > shearing is to refresh the display on the vertical retrace - when the > monitor's electron beam finished scanning a frame and returns to the top of > the screen. If you double-buffer, and tell the video card to switch buffers > during the vertical retrace, there will be no shearing. > > Unfortunately, IIRC, there is no reliable way to get vertical retrace > information from the video card in X. SDL can do this if you're running > straight from the console, without X. IIRC, AdvanceMAME running in SDL > console mode can sync to vertical retrace and eliminate your problem. > > So if you have nothing else to do, go bug the X.org developers and demand that > they implement a way to sync with vertical retrace in the next version of X.
So does the triple-buffering also do the vertical retrace syncing, and that's
actually the part that is useful, or is triple-buffering in itself going to do
anything to fix the problem?
[I was wondering about this before, when I saw that some emulators do triple
buffering, and I was confused as to how this could make any difference over
double-buffering..]
Sorry if this is getting a bit off-topic for the xmame list :)
Dave
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