[Mesa-dev] [PATCH 1/2] mesa: GL_EXT_texture_norm16 extension plumbing

[Ian Romanick]

On 04/17/2018 05:19 AM, Ilia Mirkin wrote:
> On Mon, Apr 16, 2018 at 11:22 PM, Tapani Pälli <tapani.palli at intel.com> wrote:
>> On 17.04.2018 02:42, Ilia Mirkin wrote:
>>> differentiating the case "have NV_image_formats but not
>>> EXT_texture_norm16"?
>>
>> I had a version that added another boolean but since both of these
>> extensions require GL ES 3.1 it seemed to me that it would be unlikely to
>> have platform to support 3.1 but not EXT_texture_norm16 (?)
> 
> Then why are there separate enables for this and NV_image_formats in
> the gl_extensions object?
> 
> Note that doing this properly here is a bit tricky -- it's not like
> one would do "#extension GL_EXT_texture_norm16: enable". So you'd have
> to check in the GL context for whether it's enabled somehow.
> 
> [As an aside, any impl that supports ARB_shader_image_load_store will
> support all of this. I don't know what the practical restrictions are
> on ES hardware -- Adreno does norm16 just fine, but others might not?]

I guess if this is restricted to GLES 3.1+, it should be fine to skip an
explicit enable.  When Tapani asked me about this on IRC, I was thinking
this would be more generally enabled.  There's certainly GLES 2.0
hardware in Mesa that cannot do this extension.

>   -ilia
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