[Public WebGL] Re: WebGL 2 EXT_disjoint_timer_query in Firefox

Tarek Sherif [email protected]
Wed May 24 13:07:23 PDT 2017


Here are some relevant Firefox bug tickets:
https://bugzilla.mozilla.org/show_bug.cgi?id=1308057
https://bugzilla.mozilla.org/show_bug.cgi?id=1328882

Tarek Sherif
http://tareksherif.net/
https://www.biodigital.com/


On Wed, May 24, 2017 at 1:55 PM, Kenneth Russell <[email protected]> wrote:

> That's correct, it's not supposed to be advertised.
> EXT_disjoint_timer_query is for WebGL 1.0, and _webgl2 for 2.0.
>
> The split was made fairly late in the WebGL 2.0 spec process, which is
> probably why it slipped by in Firefox.
>
> https://github.com/KhronosGroup/WebGL/pull/2405 strengthens the
> conformance test. Thanks for pointing this out.
>
> -Ken
>
>
> On Wed, May 24, 2017 at 10:36 AM, Kai Ninomiya <[email protected]> wrote:
>
>> IIRC the EXT_disjoint_timer_query extension is not supposed to be
>> available at all for WebGL 2 contexts. Getting that extension should fail.
>> It's possible we forgot to add a conformance test for this behavior, and it
>> slipped by in Firefox.
>>
>> On Wed, May 24, 2017 at 8:19 AM Tarek Sherif <[email protected]> wrote:
>>
>>> Ah, I just realized I was only using the TIME_ELAPSED_EXT and
>>> GPU_DISJOINT_EXT enums on the extensions, which is why they appeared to be
>>> interchangeable. The presence of the original EXT_disjoint_timer_query on a
>>> WebGL 2 context does still strike me as odd, since the text from spec I
>>> quoted suggests that it shouldn't be.
>>>
>>> Tarek Sherif
>>> http://tareksherif.net/
>>> https://www.biodigital.com/
>>>
>>>
>>> On Wed, May 24, 2017 at 9:29 AM, Tarek Sherif <[email protected]> wrote:
>>>
>>>> I'm confused by how EXT_disjoint_timer_query is behaving with WebGL 2
>>>> contexts in Firefox. It allows both WebGL 1 (e.g. ext.createQueryEXT) and
>>>> WebGL 2 (gl.createQuery) usage. Is the WebGL 2 usage is guaranteed for this
>>>> extension? The EXT_disjoint_timer_query spec doesn't mention the WebGL 2
>>>> usage, but does state: "This version of the disjoint_timer_query extension
>>>> is exposed only on on WebGL 1.0 contexts. See the _webgl2 version of the
>>>> extension for how it is exposed on WebGL 2.0 contexts." Does that mean
>>>> EXT_disjoint_timer_query should behave as specified in
>>>> EXT_disjoint_timer_query_webgl2 when using a WebGL 2 context? If so,
>>>> it would seem that the WebGL 1-like functionality that Firefox exposes on
>>>> that extension is incorrect.
>>>>
>>>> Either way, this all seems more confusing than it needs to be...
>>>>
>>>> Tarek Sherif
>>>> http://tareksherif.net/
>>>> https://www.biodigital.com/
>>>>
>>>>
>>>
>
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