[Mesa-dev] [PATCH 0/5] ARB_internalformat_query2 support for OpenGL ES and other fixes

[Alejandro Piñeiro]

On 01/06/16 20:57, Ian Romanick wrote:
> On 06/01/2016 11:35 AM, Alejandro Piñeiro wrote:
>> On 13/05/16 23:20, Alejandro Piñeiro wrote:
>>> On 13/05/16 17:06, Ilia Mirkin wrote:
>>>> On Fri, May 13, 2016 at 10:57 AM, Alejandro Piñeiro
>>>> <apinheiro at igalia.com> wrote:
>>>>> Earlier this year the support for ARB_internalformat_query2 has landed
>>>>> [1][2], initially only for desktop GL.
>>>>>
>>>>> But looking more carefully to the spec [3], we found the following:
>>>>>
>>>>>     "Dependencies
>>>>>
>>>>>      OpenGL 2.0 or OpenGL ES 2.0 is required"
>>>>>
>>>>> Note the *or*. Additionally the spec list other GL ES 2.0/3.0
>>>>> dependencies. So that means that the extension can be also applied to
>>>>> GL ES 2.0/3.0. FWIW, this mistake is common, as it also happens with
>>>>> the khronos registry xml (khronos bug created [4]).
>>>> Are you sure it's not a mistake the other way? There's no ES extension
>>>> number allocated, and no vendor drivers expose this ext on ES, and
>>>> this would be the first GL_ARB_* ext to be exposed in ES... normally
>>>> these become GL_OES_bla or GL_KHR_bla.
>>> Seems that you were right:
>>> https://www.khronos.org/bugzilla/show_bug.cgi?id=1498#c1
>>>
>>> Although then I don't understand why ARB_internalformat_query2 has those
>>> dependencies to OpenGL ES 2.0/3.x and OES extensions:
>>> https://www.khronos.org/bugzilla/show_bug.cgi?id=1498#c2
>> I didn't get an answer to my last questions on the khronos bug. Taking
>> into account IRC comments, it is usual to be slow. In any case, the
>> first answer seems to be clear, and ARB_ extensions are not intended to
>> be exposed on OpenGL ES, and it seems that ARB_internalformat_query2 is
>> not an exception, even if the specification defines the behaviour of the
>> extension for OpenGL ES2/ES2.  So at this point, we should just move
> I believe the decision was to remove OpenGL ES from the extension.  The
> extension was originally targeted as KHR, but, for reasons I don't
> recall, that didn't work out.  The bits in the spec about OpenGL ES were
> just leftovers from that.

Ok, thanks for the further explanation.

BR