pfImageTile q'ing

Dorosky, Christopher G (christopher.g.dorosky++at++lmco.com)
Thu, 03 Dec 1998 22:35:44 -0700

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A have a program set up like this.

fragmet()
 {
   pfImageTile *it

   it->SetReadFunc(ReadTiles);
   it->SetReadQueue(0);
   it->load();
}

ReadTiles(pfImageTile *tile, int aTexels)
{
  FillDataBuffersUp();
  if (tile_not_found()) return 0;
  else return aTexels;
/* If the right number isn't returned, everything blows up */
}

Question 1: Of course this is extremely abbreviated, but even in the
original code, aTexels never seems to be calculated before load(). How is
this information passed?

Question 2: Does the return value somehow do the same thing as
setValidTexels() ?

I wanted to try to go asyncronous, so as a test I left setReadQueue at zero,
and changed ReadTiles to insert pfImageTile * onto a valid pfqueue, which
had a single service procedure of FillDataBuffersUp. I made ReadTiles wait
for queue completion before returning. This worked fine. Problem is, it buys
nothing.

Question 3: Given a valid pfQueue with a working service procedure, how do
you make pfImageTile add the correct information to the queue? Is it solely
with SetReadQueue? If so, is setReadFunc necessary? Will a return value of
aTexels from the pfqueue perform the same action as a return of aTexels from
ReadTiles?

Question 4: Does a queue in this instance have to be a global read queue?

Thanks for any help to any question.

Chris Dorosky
Lockheed Martin Vought Systems

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