From:	ao950 AT FreeNet DOT Carleton DOT CA (Paul Derbyshire)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: How fast can you get in 640x480? (allegro)
Date:	22 May 1997 04:44:15 GMT
Organization:	The National Capital FreeNet
Lines:	22
Message-ID:	<5m0iuv$m7j@freenet-news.carleton.ca>
References:	<3382D395 DOT 118 AT canvaslink DOT com> <01bc6614$95f87b40$372f63c3 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 DOT REMOVE_THIS_BIT) writes:
>> Another -very important- difference is that it totally helps to dword
>> align the x coordinates when you draw a sprite.  In other words, you
>> need to use multiples of four.  In 640x480 this really isn't that bad if
>> you do it right, and it brought my frame rate from around 20-30fps to
>> 60-70fps (!!!).
> 
> 	Excuse my ignorance, but - what? How do you do that then / what do you
> mean?
> 	Is that like only drawing sprites at x=0, x=4, x=8 . . . ?

Isn't this alignment thing only for Mode X? 640x480 Diamond Stealth sure
isn't Mode X. (I use off-screen areas and other clever tricks to get my
mode X game to take advantage of the latch registers without it scrolling
in four pixel lurches.)

--
    .*.  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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