Re: EGL & OpenGLES2 without X

On Thu, 22 May 2014 09:01:50 -0600
Brian Paul <[email protected]> wrote:

> On 05/22/2014 08:50 AM, Will Wagner wrote:
> > On 22/05/2014 15:48, Brian Paul wrote:
> >> On 05/22/2014 04:55 AM, Will Wagner wrote:
> >>>
> >>> Is it possible to build mesa without X so that it supports
> >>> the standard EGL calls or is there no way of doing this
> >>> without using the mesa extension?
> >>
> >> Well, if you don't have X you don't have windowing so there's
> >> only full-screen rendering.
> >
> > Sorry, should have said, full screen rendering is exactly what
> > I want (And is what the e2gears demo does when it uses the
> > custom mesa surface api). What I want to know is it possible to
> > get full screen rendering without the mesa extension.
> 
> I haven't looked at the EGL code in years, but I don't think
> there's support for that.

The EGL DRM/GBM platform is designed to run on bare DRM/KMS with
the help of libgbm. An advanced example is Weston, the reference
Wayland compositor.

A simpler example is https://github.com/robclark/kmscube

Whether you would consider the EGL GBM platform as standard or a
Mesa "extension" is up to you. It is possible to implement it also
outside of Mesa, and I think some (one? proprietary?) driver stacks
might actually do that.


Thanks,
pq