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From: | "Damian Yerrick" <die DOT spammers AT pineight DOT 8m DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Nearptr putpixel method? |
Date: | Sun, 29 Aug 1999 22:37:53 -0500 |
Organization: | Rose-Hulman Institute of Technology |
Message-ID: | <7qcucs$78c$1@solomon.cs.rose-hulman.edu> |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Legolas tried to putpixel() in mode 13h (its frame buffer is at absolute address 0x0000a000) using the nearptr hack. After trying to work it out with Dan Gold, Legolas recompiled a day later and it worked fine. > ummm... scratch that. Yes, I was in mode 13h, but it didn't work. Now, > suddenly it does. Speed-wise, there is no improvement over the farptr method That's because the Pentium is doing the same work, just in a different segment selector. > (or maybe an infinitesimal improvement, but not signifigant). It does, > however seem to be a more convenient way of accessing the video memory. No, the nearptr hack is not more convenient. It brings with it general protection faults, page faults, and other things that, if you use nearptr, are your fault, up to and including data loss. > I'll experiment with it over time. Don't if you value your data.
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