On Thu, 23 Mar 2006, Florent Monnier wrote:
> > > > You can render to a pixmap and then copy the contents of the
> > > > pixmap to the window with XCopyArea(). This will be similar to
> > > > many implementations of glXSwapBuffers, however, many GL implementation
> > > > allow synchronization with the refresh rate, while Xlib offers no
> > > > such feature. Note that glXSwapBuffers executes an implicit
> > > > glFlush, while XCopyArea does not execute an implicit XFlush.
> > >
> > > Thanks a lot!
> > >
> > > It works, but there is a big big loss of performence !
> > >
> > > Without double buffer the frame rate can be for a test example
> > > 380 frames per seconds,
> > > but with double-buffer it slows a lot down to
> > > 30 frames / seconds.
> >
> > That sounds like the pixmap didn't get put in videoram, which
> > is unfortunate. It probably would have been fast if the pixmap
> > was in videoram. Does this card have very much videoram?
>
> My video card is a nVidia GeForce4 Ti 4200 with AGP8X
>
> > If you VT switch to the console and then back to X
>
> Sorry, I'm not sure to understand,
> What is VT ?
Switch to a different Virtual Terminal. Ctrl-Alt-F2 and then
back to the server again (usually Ctrl-Alt-F7, or whichever
/var/log/XFree86.0.log file says it's using. Eg.:
(--) using VT number 7
)
Mark.
>
> > (to clear out the existing videoram pixmaps) before starting your app does
> > it run significantly faster?
>
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