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| From | jt@toerring.de (Jens Thoms Toerring) |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: passing static 2D array to function - not fully working like I hoped for... |
| Date | 2011-12-29 19:38 +0000 |
| Organization | Freie Universitaet Berlin |
| Message-ID | <9m3ttuFb3eU1@mid.uni-berlin.de> (permalink) |
| References | <41a267c2-3e83-4c98-9061-34a7e390e6d9@k10g2000yqk.googlegroups.com> <9m3mkvFh9sU1@mid.uni-berlin.de> <ff48c721-ce6d-4764-a164-d049f1b9659a@n39g2000yqh.googlegroups.com> |
someone <newsboost@gmail.com> wrote:
> On Dec 29, 6:34 pm, j...@toerring.de (Jens Thoms Toerring) wrote:
> > someone <newsbo...@gmail.com> wrote:
> >
> > Please note that your code is C++ while this is a C newsgroup.
> Maybe 1% C++ and 99% C, ok.
Well, there are sume subtle differences between C and C++
and when you write C++ (i.e. use a C++ compiler, your program
won't compile with a C compiler) then it's typically better
to ask in the correct group - it may safe you a lot of time
and grieve. And sometimes there are also more elegant so-
lutions to a problem in C++.
> > Note that the casts to 'GLfloat' are rather likely unnecessary
> > - why did you put them in? I would recomend to use casts only
> Actually I cast double -> float, so I make the intermediate
> calculations using double precision, but when it comes to actually
> storing the data, I save it as a float (less precision). Normally I
> would be doing everything with double precision...
All calculations are done in double anyway (even if you
use floats - and on quite a number of architectures even
with an even wider representation than double, i.e. on
x86 you often have 64 bit doubles but computation are all
done with 80 bit) and if you assign to a float the value
will be converted to a float without any cast.
> Of some reason, floats seem to be widely used with opengl...
Probably because the results don't need a high precision (does
it matter if a pixel is shown at position 231.122387267423 or
231.122387267424?) and floats often take only half as much
space as doubles to store.
Regards, Jens
--
\ Jens Thoms Toerring ___ jt@toerring.de
\__________________________ http://toerring.de
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passing static 2D array to function - not fully working like I hoped for... someone <newsboost@gmail.com> - 2011-12-29 09:11 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-29 17:27 +0000
Re: passing static 2D array to function - not fully working like I hoped for... someone <newsboost@gmail.com> - 2011-12-29 10:55 -0800
Re: passing static 2D array to function - not fully working like I hoped for... jt@toerring.de (Jens Thoms Toerring) - 2011-12-29 17:34 +0000
Re: passing static 2D array to function - not fully working like I hoped for... someone <newsboost@gmail.com> - 2011-12-29 11:03 -0800
Re: passing static 2D array to function - not fully working like I hoped for... jt@toerring.de (Jens Thoms Toerring) - 2011-12-29 19:38 +0000
Re: passing static 2D array to function - not fully working like I hoped for... "BartC" <bc@freeuk.com> - 2011-12-29 23:19 +0000
Re: passing static 2D array to function - not fully working like I hoped for... "BartC" <bc@freeuk.com> - 2011-12-31 11:29 +0000
Re: passing static 2D array to function - not fully working like I hoped for... 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-29 17:26 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Keith Thompson <kst-u@mib.org> - 2011-12-29 11:58 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-25 17:45 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Kaz Kylheku <kaz@kylheku.com> - 2012-01-26 02:08 +0000
Re: passing static 2D array to function - not fully working like I hoped for... James Kuyper <jameskuyper@verizon.net> - 2011-12-29 15:35 -0500
Re: passing static 2D array to function - not fully working like I hoped for... Keith Thompson <kst-u@mib.org> - 2011-12-29 13:25 -0800
Re: passing static 2D array to function - not fully working like I hoped for... "io_x" <a@b.c.invalid> - 2011-12-31 16:32 +0100
Re: passing static 2D array to function - not fully working like I hoped for... 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-31 15:10 -0800
Re: passing static 2D array to function - not fully working like I hoped for... "osmium" <r124c4u102@comcast.net> - 2011-12-31 18:03 -0600
Re: passing static 2D array to function - not fully working like I hoped for... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-29 20:37 +0000
Re: passing static 2D array to function - not fully working like I hoped for... jgk@panix.com (Joe keane) - 2012-01-03 15:48 +0000
Re: passing static 2D array to function - not fully working like I hoped for... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-03 16:47 +0000
Re: passing static 2D array to function - not fully working like I hoped for... Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-01-05 22:31 +0200
Re: passing static 2D array to function - not fully working like I hoped for... Nobody <nobody@nowhere.com> - 2011-12-31 09:23 +0000
Re: passing static 2D array to function - not fully working like I hoped for... Keith Thompson <kst-u@mib.org> - 2011-12-31 11:04 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Nobody <nobody@nowhere.com> - 2012-01-01 08:20 +0000
Re: passing static 2D array to function - not fully working like I hoped for... Barry Schwarz <schwarzb@dqel.com> - 2011-12-29 09:49 -0800
Re: passing static 2D array to function - not fully working like I hoped for... someone <newsboost@gmail.com> - 2011-12-29 11:13 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Seebs <usenet-nospam@seebs.net> - 2011-12-29 19:22 +0000
Re: passing static 2D array to function - not fully working like I hoped for... someone <newsboost@gmail.com> - 2011-12-29 13:29 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Seebs <usenet-nospam@seebs.net> - 2011-12-29 21:42 +0000
Re: passing static 2D array to function - not fully working like I hoped for... someone <newsboost@gmail.com> - 2011-12-29 15:28 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Keith Thompson <kst-u@mib.org> - 2011-12-29 14:46 -0800
Re: passing static 2D array to function - not fully working like I hoped for... James Kuyper <jameskuyper@verizon.net> - 2011-12-29 18:29 -0500
Re: passing static 2D array to function - not fully working like I hoped for... Seebs <usenet-nospam@seebs.net> - 2011-12-30 00:03 +0000
Re: passing static 2D array to function - not fully working like I hoped for... James Kuyper <jameskuyper@verizon.net> - 2011-12-29 21:30 -0500
Re: passing static 2D array to function - not fully working like I hoped for... Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-25 17:47 -0800
Re: passing static 2D array to function - not fully working like I hoped for... Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-25 17:39 -0800
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