reading frame buffer

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Jean-Luc Dery (dery++at++cae.ca)
Thu, 21 Sep 1995 10:49:32 -0400

I'm working on a project that involves image processing in realtime. The
machine used is a Onyx with 2 RE2s. My problem comes from the fact that I need
to read and write the frame buffer content for processing because the RE2's
don't offer the features needed for the type of processing I want. I'm using
the lrectread and lrectwrite functions to get data of a 640x480 channel. I've
timed these functions as follows:

lrectread normal buffer, 32 bits : 12-18 msec
lrectread z buffer, 32 bits : 42-75 msec
lrectwrite normal buffer, 32 bits : 10-15 msec

These values are way to high; would anyone know tricks or hints, software or
hardware (ex. more POWERchannel-2-Board), to reduce these values, and to what
extend these values might be reduced.

Thanks in advance for any information.

-- 
___________________________________________________________________
                                           ____    ___   __
Jean-Luc Dery                               /  \  /_    /__) \__/
System engineer                          __/___/ /___  /  \   /
                                         
CAE Electronics Ltd.
GRAPHICS SOFTWARE TECHNOLOGY             Phone: (514)341-6780 x2275
e-mail:  dery++at++cae.ca                     FAX:   (514)340-5496
___________________________________________________________________

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