From:	ao950 AT FreeNet DOT Carleton DOT CA (Paul Derbyshire)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Allegro 2.2, Floats & ints and stuff
Date:	7 Mar 1997 07:38:33 GMT
Organization:	The National Capital FreeNet
Lines:	32
Message-ID:	<5foglp$5jv@freenet-news.carleton.ca>
References:	<01bc2829$3f3158a0$af2749c2 AT default>
Reply-To:	ao950 AT FreeNet DOT Carleton DOT CA (Paul Derbyshire)
NNTP-Posting-Host:	freenet3.carleton.ca
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

"Thomas Harte" (T DOT Harte AT btinternet DOT com) writes:
> 	Right now I have, in my opinion a rather impressive landscape program
> (Shawn - it is many generations ahead of what I sent you when it was all
> beta and stuff), however, it uses entirely the Allegro 'V3d_f's and so
> 'apply_amtrix_f's. I think, as these are the floating point equivalents of
> 'V3D' and 'apply_matrix', chances are the accuracy they give is superfluous
> to my needs (video game programming), so I want to switch to the fixed
> point 'V3D's and 'apply_matrix's and so on. However, when I recompile my
> program with all the '_f's removed, no display occurs. Can anyone help?
> Sorry to have wasted your time is it's something needlessly obvious . . . .

If you previously used numeric constants that were assigned to floating
point variables that now are fixed point, they must now be changed from

float_var=A_NUMBER

to
fixed_var=ftofix(A_NUMBER)

Or, change the #defines of floats to #define A_NUMBER (ftofix(0.75)) or
whatever.

And, angles will be in a format of 256 degrees per circle, not in radians
using fixed point.


--
    .*.  Where feelings are concerned, answers are rarely simple [GeneDeWeese]
 -()  <  When I go to the theater, I always go straight to the "bag and mix"
    `*'  bulk candy section...because variety is the spice of life... [me]
Paul Derbyshire ao950 AT freenet DOT carleton DOT ca, http://chat.carleton.ca/~pderbysh

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