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Xref: sserve comp.os.386bsd.apps:1023 comp.os.linux.misc:10838 Newsgroups: comp.os.386bsd.apps,comp.os.linux.misc Path: sserve!newshost.anu.edu.au!munnari.oz.au!constellation!news.uoknor.edu!ns1.nodak.edu!netnews.nwnet.net!pnl-oracle!osi-east2.es.net!fastrac.llnl.gov!usenet.ee.pdx.edu!cs.uoregon.edu!sgiblab!swrinde!cs.utexas.edu!howland.reston.ans.net!agate!msuinfo!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!marlin.jcu.edu.au!glen From: glen@paladine.ece.jcu.edu.au (Glen Harris) Subject: Re: DOOM for X Message-ID: <glen.763349922@paladine> Sender: news@marlin.jcu.edu.au (USENET News System) Organization: James Cook University References: <1994Mar3.131137.27311@infodev.cam.ac.uk> <CM44Lq.78x@seagoon.newcastle.edu.au> <2lkpg5$8hn@Tut.MsState.Edu> <hastyCMEw58.FMr@netcom.com> <2lm9ih$6s5@godot.cc.duq.edu> Date: 11 Mar 94 01:38:42 GMT Lines: 18 In <2lm9ih$6s5@godot.cc.duq.edu> mcquill@next.duq.edu (Tod McQuillin) writes: >Amancio, what effect, if any, do you think the shared memory extentions of X >have on graphics performance? What it means is that a bitmap in memory is mapped directly over the screen, so an access to the array is an access to the screen. After the mapping is set up, there's no calls to X for the graphics. In effect, it's exactly as if you were in dos, but there's no 64Kb segment switching as the system does this transparently. *I* don't know how page flipping is done, maybe there's a X call to do this, or a fast memcpy during the refresh? Inquiring minds....... -- ******************************************************************* * Glen Harris * 3D and Virtual Reality Groupie * * Don't mail here * Mail to: glen@wench.ece.jcu.edu.au * *******************************************************************