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Trying to sync X11 application with vertical retrace.

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Old 08-26-2008
Trying to sync X11 application with vertical retrace.
Hi!

I'm trying to write an X11 application with the Xext extension and I'd like to update window content during/after the vertical retrace so they appear smoothly and don't shear.

I've found xsync-flip.c at Index of /xorgsync which should do the trick but that produces:

X Error of failed request: XSyncBadCounter
Major opcode of failed request: 132 (SYNC)
Minor opcode of failed request: 5 (X_SyncQueryCounter)
Counter in failed request: 0x2400001
Serial number of failed request: 17
Current serial number in output stream: 17

Does anyone have a working example using XSyncAwait & company?

Thanks.
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LEARN ABOUT OSF1

vga_waitretrace

vga_waitretrace(3)						Svgalib User Manual						vga_waitretrace(3)

NAME

       vga_waitretrace - wait for vertical retrace.

SYNOPSIS

       #include <vga.h>

       void vga_waitretrace(void);

DESCRIPTION

       Wait  for  vertical  retrace, that is when the video beam goes dark and returns from the bottom line to the top line. Useful to synchronize
       animation with monitor refresh.

       However, Linux is a multiuser OS, thus some time might have passed already when the function returns. Also, not all cards support  this	in
       all modes (or with more or less good results).

SEE ALSO

       svgalib(7), vgagl(7), libvga.config(5), scrolltest(6),

AUTHOR

       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced function as well as of the
       original documentation is unknown.

       It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.

       Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or  corrections
       to this first version of the svgalib manual.

Svgalib (>;= 1.2.11)						   27 July 1997 						vga_waitretrace(3)