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Article #510Re: ModeY vs. 13h
From: Ross Ridge
Date: Sat, 08 Aug 1992 10:19
Date: Sat, 08 Aug 1992 10:19
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"Josh" writes: >The problem with updating all four planes in a single access, is that your >images have to be in VGA RAM. Unfortunately, in some programming scenarios, >this cannot be. Using the VGA's latches to move 4 bytes at a time around in video memory is the only way you are going to get better speeds drawing bitmaps in a 256 colour planar mode over mode 13h. You can also get better speeds doing some simple pattern fills as well. You are not going to get better speeds coping bitmaps from main memory to video memory and you're not going to get terrible performance drawing things like lines and circles in a 256 colour planar mode. Mode Y doesn't make your video card or computer any faster. Ross Ridge -- Ross Ridge - The Great HTMU l/ // [OO][oo] ross@zooid.guild.org /()\/()/ uunet.ca!zooid!ross db //
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Newsgroups: rec.games.programmer,comp.os.msdos.programmer Path: arc1-ca.pugleaf.net!sparky!uunet!uunet.ca!geac!zooid!ross From: Ross Ridge <ross@zooid.guild.org> Subject: Re: ModeY vs. 13h Organization: ZOOiD BBS Date: Sat, 8 Aug 1992 10:19:08 GMT Message-ID: <1992Aug8.101908.7526@zooid.guild.org> Followup-To: comp.os.msdos.programmer References: <1992Aug4.222047.57853@cc.usu.edu> <JARI.KARJALA.92Aug5115627@vipunen.hut.fi> <1992Aug5.095902.57866@cc.usu.edu> Lines: 22