[Buildroot] [PATCH 1/4] package/libegl: add option for wayland extensions

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2016-08-23 22:02 +0200, Thomas Petazzoni spake thusly:
> On Tue, 23 Aug 2016 18:26:32 +0200, Yann E. MORIN wrote:
> > Wayland requires that an OpenGL/EGL implementation provides a few
> > extensions, so that wayland servers and clients can exchange buffers.
> > 
> > Currently, only one OpenGL/EGL implementation provides those extensions:
> > mesa3d.
> > 
> > However, other implementations are catching up, especially the
> > proprietary NVidia driver, which has as of late introduced those
> > extensions. Other, non-public implementations may also provide those
> > extensions.
> > 
> > A lot of wayland-related packages require those extensions, and
> > currently they have to depend on mesa3d to provide OpenGL/EGL, which
> > precludes using those packages when a non-mesa3d provider is enabled,
> > even when that providers implements the necessary extensions.
> > 
> > Add an option to the libegl virtual package, that providers on
> > OpenGL/EGL can select to state they provide those extensions.
> > 
> > Pacakges that need those extensions can additionally depend on this new
> > option, instead of the existing libegl package.
> > 
> > Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
> > ---
> >  package/opengl/libegl/Config.in | 4 ++++
> >  1 file changed, 4 insertions(+)
> 
> Applied to next, thanks.
> 
> One thing that surprises me though is that weston itself doesn't use
> this new option, and still has:
> 
> config BR2_PACKAGE_WESTON_DRM
>         bool "DRM compositor"
>         depends on BR2_PACKAGE_MESA3D_OPENGL_EGL
>         select BR2_PACKAGE_LIBDRM
>         select BR2_PACKAGE_WESTON_HAS_COMPOSITOR
> 
> # Uses libgbm from mesa3d
> comment "DRM compositor needs an OpenGL EGL backend provided by mesa3d"
>         depends on !BR2_PACKAGE_MESA3D_OPENGL_EGL
> 
> So it's weird to have a new OpenGL implementation that is said to be
> Wayland capable, but doesn't allow to build the reference Wayland
> implementation.

That's because not everything was converted. Yet.

Regards,
Yann E. MORIN.

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