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From: amen@SGI.COM (Bob Amen)
Newsgroups: comp.sys.sgi
Subject: Re: Reading pixels from screen
Message-ID: <492@quequeg.SGI.COM>
Date: 6 Oct 90 00:41:35 GMT
References: <9010021504.AA11064@aero4.larc.nasa.gov>
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 24

From article <9010021504.AA11064@aero4.larc.nasa.gov>, by blbates@AERO4.LARC.NASA.GOV ("Brent L. Bates AAD/TAB MS361 x42854"):
+ 
+    The 4Dgifts/imgtools utility scrsave has a call to gl_readscreen.
+ Why isn't this a "normal" graphics call.  

	Routines beginning in gl_ are routines internal to the GL and are
not guaranteed to be there at all in the next release.  If they are in future
releases fo the GL they are not guaranteed to have the same calling arguments,
etc.

+ For people trying create screen dump utilities this is a key routine.

	Look at lrectread(3g), readsource(3g), pixmode(3g) and readRGB(3g).

+ And DON'T tell me to use scrsave (or icut/snapshot which call scrsave).

	Ok, I won't.
+ --
+ 
+ 					Brent

-- 
	      Bob Amen (amen@sgi.com) (+1 213 312-0227)
	Silicon Graphics Computer Systems -- Los Angeles Office