From:	Alan Marrs <marrs AT signal DOT dra DOT hmg DOT gb>
Newsgroups:	comp.os.msdos.djgpp
Subject:	gouraud shading with allegro?
Date:	Thu, 23 Jan 1997 13:25:42 +0000
Organization:	Defence Research Agency
Lines:	13
Message-ID:	<32E766D6.41C6@signal.dra.hmg.gb>
NNTP-Posting-Host:	signal.dra.hmg.gb
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I was wondering if there was a fast way to do gouraud shading using the
functions built into allegro. I've currently got a 3D flat shading
engine based upon allegro. I'd like to modify this to do gouraud
shading. Currently I draw a scanline using hline() so I would envisage a
simple modification would be to replace the call to hline() with one
that draws a line by interpolating between the colors of the line edges.
I'm aware of the different drawing modes, do these affect hline()?
Anyone out there who can help? BTW I'd appreciate a decription of the
finer points of the drawing elements of allegro.

Thanks.

Alan.

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