From: Brian Corrie (brian.corrie++at++newmic.com)
Date: 08/23/2001 15:01:53
Hello All,
This is not really a Performer specific question so I apologize to the
Performer list, but this seems like the best place to ask it... We have a VR
system in which we want to be able to run a number of video formats of
widely varying configurations. Formats like 2 pipes each at 2++at++1280x1024_96s
(for a CAVE-like system driven by 2 pipes) and 1 pipe at 3++at++1024x768_96s (for
a three channel 1 pipe theatre environment). The managed area for the pipes
in the first config are 2560x1024 while in the second it is 3072x768. Thus
to switch video modes between the two configurations we need to download a
new config to the EEPROM and restart the graphics.
What I have done is create a 2++at++1280x1024_96s config with a managed area of
3072x1024 and downloaded it to the EEPROM. This is actually bigger than the
required managed area, but it means that I can switch to 3++at++1024x768_96s
without restarting the graphics because the managed area is big enough for
both video formats.
My question is, do I pay a performance penalty for this. In ircombine it
tells me that changing the managed area does not change the bandwidth being
used for the graphics pipe, so it doesn't appear to affect it in that way.
That is somewhat expected since the channels have not changed and therefore
no more pixels are actually being sent. Are there any other potential
problems that any of you experts might be aware of?
It seems to work fine so far, but we haven't tested it in terms of
performance in any significant way yet.
Thanks in advance for any info you might be able to supply.
Cheers,
Brian
This archive was generated by hypermail 2b29 : Thu Aug 23 2001 - 15:04:13 PDT