PM_ADD24 on RE

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1 total messages Started by Michael Manyin Mon, 28 Dec 1992 19:19

#19

Author: Michael Manyin
Date: Mon, 28 Dec 1992 19:19

32 lines
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We are porting a program from a VGX platform to a Crimson/RealityEngine,
and have been finding it difficult to make full use of the 4096-entry
colormap when lrectwrite'ing  8-bit images.

Specifically, we suspect that the call

pixmode( PM_ADD24, 256 );

on the RealityEngine, is the problem.


In fact, any integer offset greater than 0 produces anomalous behavior.

The pixmode manual page claims that "Pixel addition can...
be used to offset the range of a color map image",
and our code  works fine on VGX and Indigo Elan machines.

Any hints or suggestions, posted or mailed, would be appreciated.
Thanks!

Mike Manyin

-------
cross posted to:
comp.sys.sgi
comp.sys.sgi.graphics

--
--------------------------------------------------------------------
Michael Manyin                         NASA/GSFC
manyin@helene.gsfc.nasa.gov            Lab for Atmospheres, Code 912
US: (301) 286-7825                     Greenbelt, Maryland  20771

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