In particular I was thinking about a3xx hardware that most likely can't physically support ES 3.1, and also drivers that may not get it for a long while.
On Mon, Nov 9, 2015 at 6:29 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: > On Mon, Nov 9, 2015 at 7:10 PM, Ian Romanick <i...@freedesktop.org> wrote: > > On 11/04/2015 03:26 PM, Ryan Houdek wrote: > >> I'm hoping to potentially convince about lowering the minimum > >> requirement of EXT_buffer_storage from ES 3.1 to ES 3.0. > >> The only thing that causes it to require ES 3.1 is glMemoryBarrier, > >> which shouldn't really be a hard requirement since the extension can be > >> used without it. > >> This is also a similar situation with ARB_buffer_storage which Mesa > >> currently exposes to all GL versions even though it should require GL > 4.2. > >> I have my attempt at a change to the spec as follows. I've never tried > >> changing a spec page before so it's a bit new to me. > > > > I think all of the drivers that support ARB_buffer_storage also support > > ARB_texture_barrier. At the very least I think you'd need to require > > GL_MAP_CHOERENT_BIT with GL_MAP_PERSISTENT_BIT. > > Not freedreno (and only very recently for i965). Although I guess it > shouldn't be too hard to stick a gmem2mem step into the queue for such > an occasion without interrupting the tiling. > > > > > Also... Mesa is really close to getting OpenGL ES 3.1. Are there any > > drivers with which you want to use this extension that won't have GLES > 3.1? > > It'll be quite a while before freedreno supports GLES 3.1, and it's > unclear to me that the a3xx hardware will even be capable of it > (although it quite possibly may be). > > I don't know how far we are from being able to reasonably drop > freedreno into an android environment, but probably closer and more > plausibly than other drivers (i.e. adreno hw is on devices you'd run > android on... you could run android on your desktop pc too, but... > less likely, and you'd have GL there). > > -ilia >
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