home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.os.ms-windows.programmer.win32
- Path: sparky!uunet!microsoft!hexnut!andrewgo
- From: andrewgo@microsoft.com (J. Andrew Goossen)
- Subject: Re: 32 gdi, floats -> coprocessor?
- Message-ID: <1992Aug14.055017.6670@microsoft.com>
- Date: 14 Aug 92 05:50:17 GMT
- Organization: Microsoft Corporation
- References: <th+y+7g@rpi.edu>
- Lines: 27
-
- In article <th+y+7g@rpi.edu> moncrg@aix02.ecs.rpi.edu (Gregory Donald Moncreaff) writes:
- >in Petzold's discussion of the 32bit gdi for
- >windows nt, it is revealed that gdi makes
- >use of floats for such things as bezier
- >curves and transformations
- >(september microsoft journal)
- >
- >does this mean it is time to get a floating
- >point coprocessor (for those of us without
- >486dx's)?
- >
- >how does windows floating point emulator
- >compare to having actual hardware?
-
- NT does not require a math coprocessor on an x86 machine. GDI
- uses its own floating point routines; their performance is
- comparable to using a '387 (the '387 is sort of slow, and GDI
- doesn't require the 80 bits accuracy the '387 works with
- internally).
-
- On a Mips machine, GDI uses the built-in floating point.
-
- Floating point is used mostly for the transforms. None is used
- for the Bezier curves.
-
- andrewgo@microsoft.com
-
-