Re: EGL & OpenGLES2 without X

On Thu, 22 May 2014 21:05:07 +0100
Will Wagner <[email protected]> wrote:

> On 22/05/2014 20:40, Pekka Paalanen wrote:
> > 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.
> 
> Hi Pekka,
> 
> That certainly looks like what I want, once gbm is set up I can use 
> standard egl calls.
> 
> What gallium/dri/gbm configure options do you think are required?

Well, for Weston it works with these:
http://wayland.freedesktop.org/building.html

I think the essence of it are --with-egl-platforms=drm --enable-gbm.


Thanks,
pq