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. 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? > diff --git a/EXT_buffer_storage.txt b/EXT_buffer_storage.txt > index 03fcd6e..ea16fae 100644 > --- a/EXT_buffer_storage.txt > +++ b/EXT_buffer_storage.txt > @@ -30,8 +30,8 @@ Status > > Version > > - Last Modified Date: May 1, 2015 > - Author Revision: 3 > + Last Modified Date: November 4, 2015 > + Author Revision: 4 > > Number > > @@ -39,10 +39,12 @@ Number > > Dependencies > > - OpenGL ES 3.1 is required. > - > This extension is written against the OpenGL ES 3.1 (June 4, 2014) > - Specification. > + Specification, but can apply to prior specifications > + > + Requires OpenGL ES 3.0 I think I'd just change the above to replace the current "required" line with OpenGL ES 3.0 is required. and leave the rest alone. I think the rest of the edits look good. > + > + This extension interacts with OpenGL ES 3.1. > > The definition of this extension is affected by the presence of > GL_EXT_direct_state_access. > @@ -350,6 +352,50 @@ Additions to Chapter 7 of the OpenGL ES 3.1 > Specification, > by shaders prior to the barrier. Note that this may cause > additional > synchronization operations. > > +Dependencies on OpenGL ES 3.1 > + > + If OpenGL ES 3.1 is not supported apply the following modifications > to the > + OpenGL ES 3.0.4 specification: > + > + Append to the first paragraph of Section 2.10, "Buffer Objects", p. 32: > + > + Under certain circumstances, the data store of a buffer object may > + be shared between the client and server and accessed simultaneously > + by both. > + > + Modify Section 2.10.1 (Creating and Binding Buffer Objects) > + > + Append to Table 2.7, "Buffer object parameters and their values", p.34: > + > + > +------------------------------+---------+---------+------------------+ > + | | | Initial | Legal > | > + | Name | Type | Value | Values > | > + > +------------------------------+---------+---------+------------------+ > + | BUFFER_IMMUTABLE_STORAGE_EXT | boolean | FALSE | TRUE, > FALSE | > + | BUFFER_STORAGE_FLAGS_EXT | int | 0 | See > section 6.2 | > + > +------------------------------+---------+---------+------------------+ > + > + Edits to section 6.2 "Creating and Modifying Buffer Object Data > Stores" in > + ES 3.1 become edits to section 2.10.2 "Creating Buffer Object Data > Stores" > + in ES 3.0.4. > + > + Edits to section 6.3, "Mapping and Unmapping Buffer Data" in ES 3.1 > become > + edits in section 2.10.3 "Mapping and Unmapping Buffer Data" in ES 3.0.4 > + > + Edits to p.56, FlushMappedBufferRange, in ES 3.1 become edits in p.40 > + in ES 3.0.4 > + > + Edits to section 6.3.2, "Effects of Mapping Buffers on Other GL > Commands" > + in ES 3.1 become edits in p.41 in ES 3.0.4 > + > + Edits in section 6.7, "Buffer Object State" in ES 3.1 become edits in > + section 2.10.8 "Buffer Object State" in ES 3.0.4 > + > + Edits in section 20.4, "Buffer Object State", p.355 become edits in > + section 6.4, "Buffer Object State", p.247 in ES 3.0.4 > + > + If OpenGL ES 3.1 is not supported, ignore all references to > MemoryBarrier > + > New State > > Append to Table 20.4, "Buffer Object State", p.355: > @@ -521,3 +567,5 @@ Revision History > to make CPU writes visible to the GPU in > this case without an explicit flush (Bug > 13578, sync w/ ARB_buffer_storage v.25). > + > + 4 04/11/15 rhoudek Lower minimum dependency to ES 3.0 > _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
