Re: [Mesa3d-dev] Gallium software fallback/draw command failure

[Jerome G. <gl...@fr...>]

On Mon, Mar 01, 2010 at 01:40:37PM +0100, Olivier Galibert wrote:
> On Mon, Mar 01, 2010 at 12:55:09PM +0100, Jerome Glisse wrote:
> > So you don't like the pipe_context::validate() of Jose ? My
> > taste goes to the pipe_context::validate() and having state
> > tracker setting the proper flag according to the API they
> > support (GL_OUT_OF_MEMORY for GL), this means just drop
> > rendering command that we can't do.
> 
> validate-then-do is a race condition waiting to happen.  Validate is
> also a somewhat costly operation to do, and 99.999% of the time for
> nothing.  You don't want to optimize for the error case, and that's
> what validate *is*.
> 
>   OG.
> 

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.

Cheers,
Jerome