On 17.07.2014 21:00, Marek Ol??k wrote: > On Thu, Jul 17, 2014 at 12:01 PM, Michel D?nzer <michel at daenzer.net> wrote: >> From: Michel D?nzer <michel.daenzer at amd.com> >> >> This is hopefully safe: The kernel makes sure writes to these mappings >> finish before the GPU might start reading from them, and the GPU caches >> are invalidated at the start of a command stream. >> > The resource flags actually tell you what you can do. If the COHERENT > flag is set, the mapping must be cached.
Why is that required? As I explain above, we should satisfy the requirements of the ARB_buffer_storage extension AFAICT. As pointed out by you and Grigori in other posts, I should probably just drop the special treatment of persistent mappings though, so the placement and flags are derived from the buffer usage. -- Earthling Michel D?nzer | http://www.amd.com Libre software enthusiast | Mesa and X developer
