On Thu, 12 Feb 2009 18:08:56 +0530 Andy Green <[email protected]> wrote:
> If there was an effort to synthesize a VSYNC interrupt on Glamo (the > real thing doesn't exist), is there actually anyone who would use it? > > Trying to figure out whether to close this as WONTFIX or have a go at > it. I noticed the problems described in the ticket, e.g. tearing of the green oscillating rectangle which appears during startup. Sharp vertical edges moving horizontally are of course the worst possible for showing up tearing. However, in that case, is it likely that it's more to do with the slow video bus (combined with single-buffered, non-accelerated graphics) than with the timings? Any estimates of how long the synchronisation interval would be? If it's shorter than the time needed for a redraw, then for single buffered graphics I can't see it making any difference....(?) For the forthcoming 3D stuff, updates to the visible framebuffer will be happening by a (fast) hardware blit (I don't pretend to understand the more wider details of how/if X uses double buffering, but a blit operation is normal for Mesa). If there are tearing problems then, then I think this an emulated vsync would be useful for us. However, I think it'd be better to cross that bridge when we get to it. Has anyone noticed tearing with things that are definitely accelerated using EXA? Tom _______________________________________________ devel mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/devel
