On Mon, 2010-03-01 at 06:24 -0800, Olivier Galibert wrote:
> On Mon, Mar 01, 2010 at 02:57:08PM +0100, Jerome Glisse wrote:
> > validate function i have in mind as virtualy a zero cost (it will
> > boil down to a bunch of add followed by a test) and what validate
> > would do would be done by draw operation anyway.
>
> Not "would", "will". You have no way to be sure nothing changed
> between validate and draw,
pipe_contexts are not re-entrant.
> unless you're happy with an interface that
> will always be unusable for multithreading. So you'll do it twice for
> something that will always tell "yes" except once in a blue moon.
The current procedure is:
pipe->bind_this_state();
pipe->bind_that_state();
pipe->set_this_state();
pipe->set_that_state();
pipe->draw();
Making it
pipe->bind_this_state();
pipe->bind_that_state();
pipe->set_this_state();
pipe->set_that_state();
if(pipe->validate() == PIPE_OUT_OF_MEMORY)
return GL_OUT_OF_MEMORY;
pipe->draw();
Makes it no better, no worse in terms of race conditions.
Jose
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