glHistogramEXT and performer stats

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From: phowe++at++csc.com.au
Date: 01/23/2001 23:36:43

Hello,

I have encounter a problem when using glHistogramEXT
togethor with glReadPixels and have pfStats
class PFSTATSHW_GFXPIPE_TIMES
mode PFSTATSHW_GFXPIPE_TIMES_TOTAL enabled.
The draw process appears to hang, and prints out the
following after a few seconds.

GL:Wait Rdata timed out! Partial dump follows:
00000000 00000001 00000000 00012260 000009a0 000009a0 000009a0 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00012045 00012045 00012045 00000bbb 00000bbb 00000bbb 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00011d90 00011d90 00011d90 00000e70 00000e70 00000e70 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

Using glHistogramEXT with this pfStats mode appears only to be a problem when
use glReadPixels. Using glDrawPixels or glCopyPixels seem to work OK.

Enabling/Disabling hardware statistics gathering made no difference.

Does anybody know why this is a problem? Do I need to do anything to prevent this?

I have attached a simple program which produces the problem, it waits for small
period of time before turning the problem stats mode on .

Any help in solving this would be appreciated

Thanks
Peter

Platform details are: OYNX2 infiniteReality, Performer 2.4, IRIX 6.5.8

(See attached file: histogram.C)

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