On Sun, Apr 20, 2014 at 8:36 PM, Wang, Quanxian <quanxian.w...@intel.com>wrote:
> > > > > *From:* Jason Ekstrand [mailto:ja...@jlekstrand.net] > *Sent:* Monday, April 21, 2014 6:32 AM > *To:* Pekka Paalanen > *Cc:* Wang, Quanxian; wayland-devel@lists.freedesktop.org > *Subject:* Re: help: is there any way to use integer 64 type in protocol? > > > > > > > > On Sun, Apr 20, 2014 at 1:17 PM, Pekka Paalanen <ppaala...@gmail.com> > wrote: > > On Sun, 20 Apr 2014 11:10:15 +0000 > "Wang, Quanxian" <quanxian.w...@intel.com> wrote: > > > Hi, > > > > Is there any way to use type of integer 64bit in protocol? > > No. You will have to use two 32-bit arguments, or propose a patch > to add 64-bit types in a completely backwards-compatible way. I am > not sure what the latter option would entail. > > > > Adding 64-bit types wouldn't be too hard. It would involve adding a > int64_t an uint64_t types to wl_argument (I'd call them U and I personally) > and adding code throughout libwayland to parse them. In terms of backwards > compatibility, it should be fine as long as you make it 100% clear that > your new protocol extension uses the new 64bit types and therefore requires > the newer libwayland version. > > The other option is that you could do what Pekka did in the presentation > extension and split it into two 32-bit parts. What do you want to > represent that needs a 64-bit type? > > *[Wang, Quanxian] 32 is too short. Currently I use 32bit in Weston randr, > it could only stand for 16 type of operations (every type use 2 bits, > however 12 of 16 have been used.). It will be fine to use 64 bit or more > for future extension. I will try to add a patch for that. Thanks for your > comment.* > As Thiago pointed out, we can't actually add that at this point (sorry, I forgot about the 32-bit machine issue). Also, if you're using a bitfield and you think there's a reasonable chance of 32 bits being too small, then there is probably also a reasonable chance of 64 bits being too small. It might be a good idea to consider other ways of representing it. What exactly are you representing in this bitfield? Thanks, --Jason Ekstrand > Thanks, > > --Jason Ekstrand > > > > > The presentation extension could make use of a 64-bit type, too. > > > > Thanks, > pq > _______________________________________________ > wayland-devel mailing list > wayland-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/wayland-devel > > >
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