[comp.graphics] Reading Z-buffer Memory on the HP Turbo SRX

toc@batcomputer.tn.cornell.edu (Timothy F. O'Connor) (10/10/89)

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)