From: Tomas Sieger (tomas.sieger@lf1.cuni.cz)
Date: Thu 04 Jan 2001 - 16:59:44 IST
Hello, i write hard realtime application (under Linux) in which i need to use some graphics. No problem with OS load - i plan to use RtLinux. The problem is that i must ensure that graphics will appear at exact times (on order of miliseconds or hunderds of microseconds). The question is concentrated on graphics libraries throughput. Now i study power of X Windows and svgalib. It is clear that svgalib is designed in a completely different way, so svgalib reaction time could be much less than X Windows' one. I wonder if it is possible to tell how much time does svgalib / X Windows spend processing graphics (i assume no OS load - no other apps, no swapping etc., and one station only - no X Windows network connection). On X Windows there will be probably need to 'flush' or 'sync' the screen due to buffering. Does exist general answer? Specially on i86 platform? Does it depends on graphics cards / XWin/svgalib versions? Can X Windows / svgalib wait for vertical retrace? (there is such function in svgalib - does it work on all platforms / graphic cards?; but i'm afraid X Windows are not designed for such use). Any other suitable graphics libraries? thanks in advance Tomas ------------------------------------------------------------------ Unsubscribe: To: listbot@svgalib.org Body: unsubscribe linux-svgalib
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