[Mesa-dev] [PATCH] egl: Add OpenGL_ES to API string regardless of GLES version

Emil Velikov emil.l.velikov at gmail.com
Wed May 18 11:01:35 UTC 2016

On 18 May 2016 at 09:27, Erik Faye-Lund <kusmabite at gmail.com> wrote:
> On Wed, May 18, 2016 at 10:12 AM, Daniel Stone <daniel at fooishbar.org> wrote:
>> Hi,
>> On 18 May 2016 at 00:00, Ian Romanick <idr at freedesktop.org> wrote:
>>> On 05/17/2016 09:59 AM, Ben Widawsky wrote:
>>>> I think you misstated this. It's not invalid to have any other value. It's
>>>> invalid to not have one of the 3 values, which I suppose is technically possible
>>>> if you say support ES2, but not ES or GL (for example)
>>>>  "Returns a string describing which client rendering APIs are supported. The
>>>>   string contains a space-separate list of API names. The list must include at
>>>>   least one of OpenGL, OpenGL_ES, or OpenVG. These strings correspond
>>>>   respectively to values EGL_OPENGL_API, EGL_OPENGL_ES_API, and EGL_OPENVG_API
>>>>   of the eglBindAPI, api argument."
>>>> I am concerned by this change since I genuinely have no clue how EGL clients
>>>> might currently be depending on this, and as such could I request that you not
>>>> change the existing behavior (spit out when ES2 or ES3). At the bottom I put an
>>>> untested version of what i would have done.
>>> I think this might be right.  Outside of Mesa sources, I can't find any
>>> mention of OpenGL_ES2 or OpenGL_ES3 strings anywhere on the Internet.
>>> At least VLC
>>> (http://www.videolan.org/developers/vlc/modules/video_output/egl.c) uses
>>> OpenGL_ES for both OpenGL ES 1.x and 2.x.
>> Yes, and they'd be foolish not to: the proprietary Mali, PVR and
>> Vivante drivers don't expose these strings, just OpenGL_ES, OpenGL and
>> OpenVG. No idea what the proprietary Tegra drivers do, but I'd be
>> surprised if they were different.
> The proprietary NV driver on Tegra 2 reports "OpenGL_ES2 OpenGL_ES
> OpenGL OpenVG" for me :/

Thanks Erik, I wish you had better news.

So perhaps we could keep the ES2/ES3 strings for now, until we check
with newer tegra 3/4 drivers (perhaps they removed it) or a few other
programs than VLC ?

One could even add a lovely comment/reference to this discussion
alongside the code.

Just my 2c

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