[Chromium-users] Information Request: SWAP, and FLUSH()?

[James S. <arr...@gm...>]

I have been reading the Chromium source code, I have a couple of
questions about it.

what is the difference between function and functionSWAP()?
I keep seeing things like
if(tilesort_spu.swap)
{
call1SWAP
call2SWAP
call3SWAP
}
else
{
call1
call2
call3
}

Debugging indicates that I always use the non-SWAP version, What is
going on here? What does tilesort_spu.swap indicate? Why are different
functions needed for each one?

Secondly, I have been looking at the integration of various parts of
Chromium. I noticed that many calls (especially those in
tilesortspu_gen.c) call similarly named functions in the state
tracker. These state tracker functions appear to do call specific
things to update the state to what it should be after that call, at
which point they use FLUSH() (which ends up invoking doFlush() in the
tilesort SPU) to send necessary differences to the Render SPUs? Is
this correct? (ig, does FLUSH flush changes to Render SPUs as needed?)

If yes, why does FLUSH() get called before the state tracker updates
the state? I noticed that FLUSH() is always at the beginning of the
state tracker functions, shouldn't it be at the end?


Thank you for your time,
James Steven Supancic III