On Thu, 2005-02-10 at 22:23 -0500, Jon Smirl wrote: > On Thu, 10 Feb 2005 21:59:29 -0500, Owen Taylor <[EMAIL PROTECTED]> wrote: > > That should allow a straight-copy from data you create to memory card > > the can texture from, which is about as good as possible. > > If you have a big AGP aperture to play with there is a faster way. > When you get the call to copy the texture from user space, don't copy > it. Instead mark it's page table entries as copy on write. Get the > physical address of the page and set it into the GART. Now the GPU can > get to it with zero copies. When you are done with it, check and see > if the app caused a copy on write, if so free the page, else just > remove the COW flag.
Is there evidence that this is/would be in fact faster? -- Eric Anholt [EMAIL PROTECTED] http://people.freebsd.org/~anholt/ [EMAIL PROTECTED] ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
