Date: Tue, 05 Sep 1995 09:01:05 -0600 (MDT) From: Jon Subject: Re: Graphics performance under v2.0 To: djgpp AT sun DOT soe DOT clarkson DOT edu On Tue, 5 Sep 1995 stwand07 AT uctvms DOT uct DOT ac DOT za wrote: > Hi > > I read somebody complain recently that graphics under V2.0 (ie LibGRX 2.0) > is (are?) really slow compared to v 1. Just how much slower are graphics > operations, and is this caused by the DPMI host controlling paging, etc. > or due to "beta" code that is less optimised than previously ? > > Obviously programs working unders Windows is an advantage, but if > performance suffers I'll be staying with v 1 for quite a while to > come! Well, DPMI runs things at ring 3, which can be a bit slower than ring 0 (I'm not sure if version 1 ran at ring 0 or not.). However, I've been doing some graphics stuff using farptr.h and _farnspokeb() and it seems to be fast enough. -Jon