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From: toc@batcomputer.tn.cornell.edu (Timothy F. O'Connor)
Newsgroups: comp.graphics,comp.sys.hp
Subject: Reading Z-buffer Memory on the HP Turbo SRX
Message-ID: <9028@batcomputer.tn.cornell.edu>
Date: 10 Oct 89 00:17:16 GMT
Distribution: comp
Organization: Theory Center, Cornell U., Ithaca NY
Lines: 12

Is it possible to directly read the contents of the z-buffer on the
HP Turbo SRX?  I know that the z-buffer memory can be read, 8 bits at a 
time, using bank_switch(3G) and block_read(3G).  Unfortunately, these
routines are fairly slow.  

I'd really like the z-buffer analog to the frame buffer's R_GET_FRAME_BUFFER 
gescape.  (As briefly outlined in the HP 98731 device driver manual, the 
R_GET_FRAME_BUFFER gescape returns the starting address of the frame buffer, 
allowing all 24 bits of the frame buffer to be read at one time).

Many thanks,
Tim (toc@wisdom.graphics.cornell.edu)