> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of Ilia
> Mirkin
> Sent: Tuesday, January 12, 2016 7:09 PM
> To: Marta Lofstedt
> Cc: [email protected]; Romanick, Ian D; Lofstedt, Marta
> Subject: Re: [PATCH V3] glapi: add GL_OES_geometry_shader extension
>
> On Tue, Jan 12, 2016 at 9:13 AM, Marta Lofstedt
> <[email protected]> wrote:
> > From: Marta Lofstedt <[email protected]>
> >
> > Add xml definitions for the GL_OES_geometry_shader extension and
> > expose the extension for OpenGL ES 3.1.
> >
> > V3: Added dependency to OES_shader_io_blocks and updated to correct
> > Khronos extension number.
>
> May I ask why you did this? OES_shader_io_blocks is a purely shader
> compiler/linker feature, I expect it will be enabled whenever GLES 3.1 is
> enabled, no? Why would it be tied to geometry shaders? Sure, geometry
> shaders require it to work, but just because you have OES_shader_io_blocks
> doesn't necessarily mean you also have geometry shaders...
>
My intension was to address the co-dependency between oes_geometry_shader and
oes_shader_io_block.
But as always, you are right Ilia. The dependency issue need to be fixed in the
driver.
So, please disregard this V3, I will push the V2 with the changes suggested by
Ilia in the comments.
FYI here are quotes from the oes_geometry_shader specification:
" OES_shader_io_blocks or EXT_shader_io_blocks is required."
" This extension relies on the OES_shader_io_blocks extension to provide
the required functionality for declaring input and output blocks and
interfacing between shaders."
" If the OES_geometry_shader extension is enabled, the
OES_shader_io_blocks extension is also implicitly enabled.
> In practical terms, there's a non-trivial chance that A4xx will get
> tessellation
> before geometry shaders, which would also require OES_shader_io_blocks
> to be exposed.
Yes, but for desktop we already have the "shader_io_block" functionality.
So, the dependency is a GLES issue, and tessellation is not yet exposed under
GLES.
>
> -ilia
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