Am 20.07.2015 um 22:46 schrieb Ilia Mirkin: > On Mon, Jul 20, 2015 at 3:53 PM, Brian Paul <bri...@vmware.com> wrote: >> On 07/20/2015 01:19 PM, Ilia Mirkin wrote: >> >>> On Mon, Jul 20, 2015 at 2:44 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: >>>> >>>> Hi Brian, >>>> >>>> You marked off ARB_copy_image (and ARB_clear_texture) as in-progress >>>> by VMware some months ago -- has there been any movement on that? It >>>> appears that Bioshock Infinite requires ARB_copy_image so might be >>>> nice to get that added in. >>>> >>>> The complication in implementing ARB_copy_image was that st/mesa will >>>> pick potentially different PIPE_FORMAT enums for the same internal >>>> format, depending on the parameters to the glTexImage call. A >>>> developer (irc handle Leftmost, I forget his real name, sorry) tried >>>> to wrestle with the issues this presents, but as I recall ended up >>>> coming up short. >>>> >>>> The final implementation probably needs some combination of >>>> resource_copy_region and blit. I think resource_copy_region currently >>>> is spec'd to require identical formats in src and dst, but that could >>>> be relaxed. >>>> >>>> Anyways, would be interested in hearing whether you guys have made any >>>> progress, or if you had thoughts on proper implementation. >>>> >>>> Cheers, >>>> >>>> -ilia >>> >>> >>> As an aside, here's a very naive implementation of the ext, which >>> fails for lots of reasons not the least of which is that we default to >>> BGRA instead of RGBA. Perhaps we could create a resource_copy_region >>> version that also takes (or knows about) swizzles... that should also >>> cover many (all?) of the situations I think. >> >> >> One of our interns did the implementation (with some contributions from me). >> I need to do a lot of clean-up before posting the patches here though. I >> was hoping to do that in the next month or two. If you need it sooner, I'll >> can see what I can do. > > As there's a decent chance that tessellation and subroutine support > will land in the next release (thus exposing GL 4.1 in several > drivers), and there is an actual released game that requires > ARB_copy_image, it would definitely be nice to see support land before > the next mesa release is branched off, which should happen in about a > month's time I guess. > Are you sure it actually requires ARB_copy_image (not just optionally uses it)? Seems like it shouldn't be, since officially it only needs GL 4.1, and this extension only became core with 4.3. (There's also a mac version which doesn't support that feature neither).
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