OpenGL on Wayland

[Giulio Camuffo]

2014-06-28 20:33 GMT+03:00 Armin K. <krejzi at email.com>:
> On 06/27/2014 09:15 PM, Jason Ekstrand wrote:
>>
>> On Jun 27, 2014 11:49 AM, "Armin K." <krejzi at email.com
>> <mailto:krejzi at email.com>> wrote:
>>>
>>> On 27.6.2014 20:08, Kalrish Bäakjen wrote:
>>>>
>>>> Hello,
>>>>
>>>> I am working on a project that uses EGL and defers drawing to render
>>>> modules. To maintain compatibility with Wayland and avoid being tied to
>>>> X, I have chosen OpenGL ES 3. As it is difficult for me to find
>>>> information about this API, I would rather use its desktop counterpart;
>>>> however, as said, this would make it impossible to run my application on
>>>> Wayland.
>>>>
>>>> What is the status of OpenGL on Wayland? Are there any plans on
>>>> emancipating it from GLX?
>>
>> If your concern is that your app works across window systems, then it
>> shouldn't be a problem.  You can get a desktop GL context through EGL on
>> Wayland without any problems.
>>
>> The issue everyone talks about is that libGL also contains a GLX
>> implementation so it links against Xlib.  This will create a link-time
>> dependency on Xlib.  However, since your application will not be making
>> any GLX calls, those code-paths will never get exercised and it will
>> gave no runtime dependency on having an X server.  Really, this is a
>> packaging problem far more than it is a programming problem.
>>
>>>>
>>>> Thank you, and, please, forgive me if this message does not correspond
>>>> to these lists. Regards,
>>>> Kalrish
>>>>
>>>
>>> You can request OpenGL context through EGL. libGL is a GLX
>> implementation and thus requires X to display stuff.
>>
>> As I said above, that's not a problem.
>>
>
> What I wanted to say is that you can't currently use libGL without EGL
> for drawing on Wayland. There is no OpenGL implementation for Wayland
> (GLW or whatever that could be called) - or there is?

EGL, GLX and their counterparts are not OpenGL implementations, they
are helper libraries used to glue OpenGL with the windowing system.
There is no Wayland-specific version of it, but it's not needed. The
whole point of EGL is to standardize the way of creating a OpenGL (ES)
context, so it's only natural Wayland is using it and not some NIH
thing.

--
Giulio

>
>> --Jason Ekstrand
>
> --
> Note: My last name is not Krejzi.
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